MQL, Near Dry Machining, are two of the terms used for describing
a machining method that uses a very low amount of cutting fluid that
is applied right at the point of cutting. A nozzle is positioned where
the cutting lube is to be applied and the lube is delivered along with
low pressure air so that the fluid is dispersed a little.
Different methods of metering the fluid are used. I have an air
powered unit that meters the fluid through a valve and the fluid
drops pass through a chamber so that they can be counted. The fluid is
then carried through a tube with low pressure air to the nozzle which
blows the fluid onto the desired area. The fluid is broken up into
tiny drops by the passage through the tube along with the air. But
they should be smaller.
Another machine uses an air powered piston pump that delivers the
lube through a tube that meets another tube with air flowing out and
the two flows are mixed at the nozzle.
I used to have a piston pump machine but it failed and the maker
considered it to be non-repairable and so did not offer any repair
parts. That machine got thrown away.
The one I have now has needed to be sent back twice to the maker to
be rebuilt because they would not sell some proprietary seals.
The units are quite expensive and now it looks like I am going to
need a couple more. So I want to make them myself. Especially because
even if I buy a couple they will most likely not meet my needs exactly
so the installation will be a compromise.
I ahve been looking online at metering pumps but they are all
really expensive. Part of the reason is because they are very
accurate. I don't need the accuracy the uniits provide. I just need to
dispense small drops of lube into an air stream. I don't need an air
powered unit either. A solenoid powered pump would be fine. I have
looked at peristaltic pumps but I don't think one would work the way I
want. I think something that works similar to an atomizer on a pump
bottle would work well. I'm pretty sure I can buy atomizer nozzles
small enough. I would like to deliver through a flexible tube at high
enough pressure for the atomizer nozzle to work properly. I also want
a poppet valve at the nozzle end that prevents the lube from flowing
until a pressure pulse causes it to open. That way the lube can't
drain away slowly when the lube system is idle. Some jobs have long
run times using regular water soluble flood coolant with the MQL being
used for only 1 or 2 short operations, tapping for example.
So after my long winded post can anyone help?
Thanks,
Eric

On Mon, 12 Dec 2016 14:52:09 -0800, wrote:

MQL, Near Dry Machining, are two of the terms used for describing
a machining method that uses a very low amount of cutting fluid that
is applied right at the point of cutting. A nozzle is positioned where
the cutting lube is to be applied and the lube is delivered along with
low pressure air so that the fluid is dispersed a little.
Different methods of metering the fluid are used. I have an air
powered unit that meters the fluid through a valve and the fluid
drops pass through a chamber so that they can be counted. The fluid is
then carried through a tube with low pressure air to the nozzle which
blows the fluid onto the desired area. The fluid is broken up into
tiny drops by the passage through the tube along with the air. But
they should be smaller.
Another machine uses an air powered piston pump that delivers the
lube through a tube that meets another tube with air flowing out and
the two flows are mixed at the nozzle.
I used to have a piston pump machine but it failed and the maker
considered it to be non-repairable and so did not offer any repair
parts. That machine got thrown away.
The one I have now has needed to be sent back twice to the maker to
be rebuilt because they would not sell some proprietary seals.
The units are quite expensive and now it looks like I am going to
need a couple more. So I want to make them myself. Especially because
even if I buy a couple they will most likely not meet my needs exactly
so the installation will be a compromise.
I ahve been looking online at metering pumps but they are all
really expensive. Part of the reason is because they are very
accurate. I don't need the accuracy the uniits provide. I just need to
dispense small drops of lube into an air stream. I don't need an air
powered unit either. A solenoid powered pump would be fine. I have
looked at peristaltic pumps but I don't think one would work the way I
want. I think something that works similar to an atomizer on a pump
bottle would work well. I'm pretty sure I can buy atomizer nozzles
small enough. I would like to deliver through a flexible tube at high
enough pressure for the atomizer nozzle to work properly. I also want
a poppet valve at the nozzle end that prevents the lube from flowing
until a pressure pulse causes it to open. That way the lube can't
drain away slowly when the lube system is idle. Some jobs have long
run times using regular water soluble flood coolant with the MQL being
used for only 1 or 2 short operations, tapping for example.
So after my long winded post can anyone help?
Thanks,
Eric

Stepper driven syringe pump perhaps? For example:
http://www.syringepump.com/NE-1000.php

--
Ned Simmons

On Monday, December 12, 2016 at 5:52:11 PM UTC-5, wrote:

So after my long winded post can anyone help?
Thanks,
Eric

Zt sounds as if you are going to need at the very least a timer. Perhaps some intelligence.

Consider using an Arduino. they aer dirt cheap microcontrolers. The cheapest one can work as a timer and can be set to 1/1000 of a second to any reasonable length of time. I do not remember the exact number but the max time is measured in days. They are easy to program, And I will help you.

Dan

On Mon, 12 Dec 2016 19:41:26 -0500, Ned Simmons
wrote:

On Mon, 12 Dec 2016 14:52:09 -0800, wrote:

MQL, Near Dry Machining, are two of the terms used for describing
a machining method that uses a very low amount of cutting fluid that
is applied right at the point of cutting. A nozzle is positioned where
the cutting lube is to be applied and the lube is delivered along with
low pressure air so that the fluid is dispersed a little.
Different methods of metering the fluid are used. I have an air
powered unit that meters the fluid through a valve and the fluid
drops pass through a chamber so that they can be counted. The fluid is
then carried through a tube with low pressure air to the nozzle which
blows the fluid onto the desired area. The fluid is broken up into
tiny drops by the passage through the tube along with the air. But
they should be smaller.
Another machine uses an air powered piston pump that delivers the
lube through a tube that meets another tube with air flowing out and
the two flows are mixed at the nozzle.
I used to have a piston pump machine but it failed and the maker
considered it to be non-repairable and so did not offer any repair
parts. That machine got thrown away.
The one I have now has needed to be sent back twice to the maker to
be rebuilt because they would not sell some proprietary seals.
The units are quite expensive and now it looks like I am going to
need a couple more. So I want to make them myself. Especially because
even if I buy a couple they will most likely not meet my needs exactly
so the installation will be a compromise.
I ahve been looking online at metering pumps but they are all
really expensive. Part of the reason is because they are very
accurate. I don't need the accuracy the uniits provide. I just need to
dispense small drops of lube into an air stream. I don't need an air
powered unit either. A solenoid powered pump would be fine. I have
looked at peristaltic pumps but I don't think one would work the way I
want. I think something that works similar to an atomizer on a pump
bottle would work well. I'm pretty sure I can buy atomizer nozzles
small enough. I would like to deliver through a flexible tube at high
enough pressure for the atomizer nozzle to work properly. I also want
a poppet valve at the nozzle end that prevents the lube from flowing
until a pressure pulse causes it to open. That way the lube can't
drain away slowly when the lube system is idle. Some jobs have long
run times using regular water soluble flood coolant with the MQL being
used for only 1 or 2 short operations, tapping for example.
So after my long winded post can anyone help?
Thanks,
Eric

Stepper driven syringe pump perhaps? For example:
http://www.syringepump.com/NE-1000.php
How about a simple tube roller type pump. A savvy machinist can make
his own.

On Mon, 12 Dec 2016 17:49:24 -0800 (PST), "
wrote:

On Monday, December 12, 2016 at 5:52:11 PM UTC-5, wrote:

So after my long winded post can anyone help?
Thanks,
Eric

Zt sounds as if you are going to need at the very least a timer. Perhaps some intelligence.

Consider using an Arduino. they aer dirt cheap microcontrolers. The cheapest one can work as a timer and can be set to 1/1000 of a second to any reasonable length of time. I do not remember the exact number but the max time is measured in days. They are easy to program, And I will help you.

Dan
With a tube/roller pump you just need to control the speed of
whatever motor you are using. About the simplest low pressure low
volume pump you can get - and it can be a steady flow, as compared to
pulsed outpot with either a double loop or double roller setup

On Mon, 12 Dec 2016 21:37:02 -0500, wrote:

On Mon, 12 Dec 2016 17:49:24 -0800 (PST), "
wrote:

On Monday, December 12, 2016 at 5:52:11 PM UTC-5, wrote:

So after my long winded post can anyone help?
Thanks,
Eric

Zt sounds as if you are going to need at the very least a timer. Perhaps some intelligence.

Consider using an Arduino. they aer dirt cheap microcontrolers. The cheapest one can work as a timer and can be set to 1/1000 of a second to any reasonable length of time. I do not remember the exact number but the max time is measured in days. They are easy to program, And I will help you.

Dan
With a tube/roller pump you just need to control the speed of
whatever motor you are using. About the simplest low pressure low
volume pump you can get - and it can be a steady flow, as compared to
pulsed outpot with either a double loop or double roller setup


AKA Peristaltic pump. As low as about 6 bucks on EBay - up ton several
thousand - - - -

On Monday, December 12, 2016 at 9:41:04 PM UTC-5, Clare wrote:
On Mon, 12 Dec 2016 21:37:02 -0500, wrote:

On Mon, 12 Dec 2016 17:49:24 -0800 (PST), "
wrote:

On Monday, December 12, 2016 at 5:52:11 PM UTC-5, wrote:

So after my long winded post can anyone help?
Thanks,
Eric

Zt sounds as if you are going to need at the very least a timer. Perhaps some intelligence.

Consider using an Arduino. they aer dirt cheap microcontrolers. The cheapest one can work as a timer and can be set to 1/1000 of a second to any reasonable length of time. I do not remember the exact number but the max time is measured in days. They are easy to program, And I will help you..

Dan
With a tube/roller pump you just need to control the speed of
whatever motor you are using. About the simplest low pressure low
volume pump you can get - and it can be a steady flow, as compared to
pulsed outpot with either a double loop or double roller setup


AKA Peristaltic pump. As low as about 6 bucks on EBay - up ton several
thousand - - - -

Peristaltic pumps usually aren't very good for long-term or continuous use. The tube materials suitable for handling many active liquids, like cutting fluids, are short on fatigue life, or vice versa.

However, I saw one used many years ago for pumping machine oil, and it held up for at least a year, said the guy who made it. He used silicone tubing made for carrying fuel in model aircraft.

I made one for my son's school science project on filtering water, when he was in fourth grade. I used latex tubing I got from a drug store. But it only pumped water and it only had to last through one science fair. d8-)

--
Ed Huntress

On Mon, 12 Dec 2016 14:52:09 -0800, wrote:

MQL, Near Dry Machining, are two of the terms used for describing
a machining method that uses a very low amount of cutting fluid that
is applied right at the point of cutting. A nozzle is positioned where
the cutting lube is to be applied and the lube is delivered along with
low pressure air so that the fluid is dispersed a little.
Different methods of metering the fluid are used. I have an air
powered unit that meters the fluid through a valve and the fluid
drops pass through a chamber so that they can be counted. The fluid is
then carried through a tube with low pressure air to the nozzle which
blows the fluid onto the desired area. The fluid is broken up into
tiny drops by the passage through the tube along with the air. But
they should be smaller.
Another machine uses an air powered piston pump that delivers the
lube through a tube that meets another tube with air flowing out and
the two flows are mixed at the nozzle.
I used to have a piston pump machine but it failed and the maker
considered it to be non-repairable and so did not offer any repair
parts. That machine got thrown away.
The one I have now has needed to be sent back twice to the maker to
be rebuilt because they would not sell some proprietary seals.
The units are quite expensive and now it looks like I am going to
need a couple more. So I want to make them myself. Especially because
even if I buy a couple they will most likely not meet my needs exactly
so the installation will be a compromise.
I ahve been looking online at metering pumps but they are all
really expensive. Part of the reason is because they are very
accurate. I don't need the accuracy the uniits provide. I just need to
dispense small drops of lube into an air stream. I don't need an air
powered unit either. A solenoid powered pump would be fine. I have
looked at peristaltic pumps but I don't think one would work the way I
want. I think something that works similar to an atomizer on a pump
bottle would work well. I'm pretty sure I can buy atomizer nozzles
small enough. I would like to deliver through a flexible tube at high
enough pressure for the atomizer nozzle to work properly. I also want
a poppet valve at the nozzle end that prevents the lube from flowing
until a pressure pulse causes it to open. That way the lube can't
drain away slowly when the lube system is idle. Some jobs have long
run times using regular water soluble flood coolant with the MQL being
used for only 1 or 2 short operations, tapping for example.
So after my long winded post can anyone help?
Thanks,
Eric

I've used a lot, 1/2 liter syringe, triplex diaphragm, gear. The
syringe was expensive, the triplex diaphragms with vfd drive very
expensive. Even the gear pumps were expensive. Gear and syringe pumps
were $5-10,000, triplex diaphragms $25,000 and up. All of mine were
even more expensive because of the need for mass flow meters for my
accuracy requirements, 0.1% or better.

Peristaltic pumps are much less expensive. I even saw a 3d printed
one as a feature article in the digital machining mag. Delivery can
be controlled pretty well by tube size and motor speed. Pressure
capability is somewhat limited and tubes fail.

I think you're going to have to get creative. The solenoid idea is
good if the service life is adequate. Most piston and diaphragm pumps
I used had double sapphire ball checks at inlet and outlet. I imagine
you could get by with something a little cheaper, maybe plastic.
Usually they were seated by gravity, no springs. But you'd need a
spring for a valve near the nozzle. Try disassembling some pump spray
bottles for springs and checks.

Good luck. An interesting challenge.

Pete Keillor

On Mon, 12 Dec 2016 14:52:09 -0800
wrote:

snip
I ahve been looking online at metering pumps but they are all
really expensive. Part of the reason is because they are very
accurate. I don't need the accuracy the uniits provide. I just need to
dispense small drops of lube into an air stream. I don't need an air
powered unit either. A solenoid powered pump would be fine. I have
looked at peristaltic pumps but I don't think one would work the way I
want. I think something that works similar to an atomizer on a pump
bottle would work well. I'm pretty sure I can buy atomizer nozzles
small enough. I would like to deliver through a flexible tube at high
enough pressure for the atomizer nozzle to work properly. I also want
a poppet valve at the nozzle end that prevents the lube from flowing
until a pressure pulse causes it to open. That way the lube can't
drain away slowly when the lube system is idle. Some jobs have long
run times using regular water soluble flood coolant with the MQL being
used for only 1 or 2 short operations, tapping for example.
So after my long winded post can anyone help?

Your description, request sounds a lot like a diesel injector pump.
They aren't cheap either but there are lots of old ones around. Maybe
find one for a four cylinder.

Not sure but I would try hooking all four output lines into a manifold
and then plumb it into an old injector nozzle. That should keep it from
dripping.

You could vary the speed of the pump and throttle control to vary the
output. I think it would hold up okay as long as you were running
some sort of thin oil through.

The real diesel mechanics can speak-up now and tell how stupid this
is ;-)

--
Leon Fisk
Grand Rapids MI/Zone 5b
Remove no.spam for email

On Monday, December 12, 2016 at 9:36:59 PM UTC-5, Clare wrote:
On Mon, 12 Dec 2016 17:49:24 -0800 (PST), "
wrote:

On Monday, December 12, 2016 at 5:52:11 PM UTC-5, wrote:

So after my long winded post can anyone help?
Thanks,
Eric

Zt sounds as if you are going to need at the very least a timer. Perhaps some intelligence.

Consider using an Arduino. they aer dirt cheap microcontrolers. The cheapest one can work as a timer and can be set to 1/1000 of a second to any reasonable length of time. I do not remember the exact number but the max time is measured in days. They are easy to program, And I will help you.

Dan
With a tube/roller pump you just need to control the speed of
whatever motor you are using. About the simplest low pressure low
volume pump you can get - and it can be a steady flow, as compared to
pulsed outpot with either a double loop or double roller setup

I've got a Stenner peristaltic pump that doses chlorine into my well
water. Something smaller, with thin tygon fuel line tubing?? (maybe)
might work. What do you mean by a double loop, or double roller?
(The Stenner goes around in a circle with three rollers.)

George H.

On Mon, 12 Dec 2016 21:34:47 -0500, wrote:

On Mon, 12 Dec 2016 19:41:26 -0500, Ned Simmons
wrote:

On Mon, 12 Dec 2016 14:52:09 -0800, wrote:

MQL, Near Dry Machining, are two of the terms used for describing
a machining method that uses a very low amount of cutting fluid that
is applied right at the point of cutting. A nozzle is positioned where
the cutting lube is to be applied and the lube is delivered along with
low pressure air so that the fluid is dispersed a little.
Different methods of metering the fluid are used. I have an air
powered unit that meters the fluid through a valve and the fluid
drops pass through a chamber so that they can be counted. The fluid is
then carried through a tube with low pressure air to the nozzle which
blows the fluid onto the desired area. The fluid is broken up into
tiny drops by the passage through the tube along with the air. But
they should be smaller.
Another machine uses an air powered piston pump that delivers the
lube through a tube that meets another tube with air flowing out and
the two flows are mixed at the nozzle.
I used to have a piston pump machine but it failed and the maker
considered it to be non-repairable and so did not offer any repair
parts. That machine got thrown away.
The one I have now has needed to be sent back twice to the maker to
be rebuilt because they would not sell some proprietary seals.
The units are quite expensive and now it looks like I am going to
need a couple more. So I want to make them myself. Especially because
even if I buy a couple they will most likely not meet my needs exactly
so the installation will be a compromise.
I ahve been looking online at metering pumps but they are all
really expensive. Part of the reason is because they are very
accurate. I don't need the accuracy the uniits provide. I just need to
dispense small drops of lube into an air stream. I don't need an air
powered unit either. A solenoid powered pump would be fine. I have
looked at peristaltic pumps but I don't think one would work the way I
want. I think something that works similar to an atomizer on a pump
bottle would work well. I'm pretty sure I can buy atomizer nozzles
small enough. I would like to deliver through a flexible tube at high
enough pressure for the atomizer nozzle to work properly. I also want
a poppet valve at the nozzle end that prevents the lube from flowing
until a pressure pulse causes it to open. That way the lube can't
drain away slowly when the lube system is idle. Some jobs have long
run times using regular water soluble flood coolant with the MQL being
used for only 1 or 2 short operations, tapping for example.
So after my long winded post can anyone help?
Thanks,
Eric

Stepper driven syringe pump perhaps? For example:
http://www.syringepump.com/NE-1000.php
How about a simple tube roller type pump. A savvy machinist can make
his own.
Last yime I saw one of those, it was hooked to my wife's arm, trying
to induce the birth of Junior two weeks early since it was thought he
was trying to live "in" and not gaining any weight - after three days
he weighed in at 7lb.12.
As to the peristaltic (?) pump, I paid $2for the example down in the
shop.

On Mon, 12 Dec 2016 19:41:26 -0500, Ned Simmons
wrote:

On Mon, 12 Dec 2016 14:52:09 -0800, wrote:

MQL, Near Dry Machining, are two of the terms used for describing
a machining method that uses a very low amount of cutting fluid that
is applied right at the point of cutting. A nozzle is positioned where
the cutting lube is to be applied and the lube is delivered along with
low pressure air so that the fluid is dispersed a little.
Different methods of metering the fluid are used. I have an air
powered unit that meters the fluid through a valve and the fluid
drops pass through a chamber so that they can be counted. The fluid is
then carried through a tube with low pressure air to the nozzle which
blows the fluid onto the desired area. The fluid is broken up into
tiny drops by the passage through the tube along with the air. But
they should be smaller.
Another machine uses an air powered piston pump that delivers the
lube through a tube that meets another tube with air flowing out and
the two flows are mixed at the nozzle.
I used to have a piston pump machine but it failed and the maker
considered it to be non-repairable and so did not offer any repair
parts. That machine got thrown away.
The one I have now has needed to be sent back twice to the maker to
be rebuilt because they would not sell some proprietary seals.
The units are quite expensive and now it looks like I am going to
need a couple more. So I want to make them myself. Especially because
even if I buy a couple they will most likely not meet my needs exactly
so the installation will be a compromise.
I ahve been looking online at metering pumps but they are all
really expensive. Part of the reason is because they are very
accurate. I don't need the accuracy the uniits provide. I just need to
dispense small drops of lube into an air stream. I don't need an air
powered unit either. A solenoid powered pump would be fine. I have
looked at peristaltic pumps but I don't think one would work the way I
want. I think something that works similar to an atomizer on a pump
bottle would work well. I'm pretty sure I can buy atomizer nozzles
small enough. I would like to deliver through a flexible tube at high
enough pressure for the atomizer nozzle to work properly. I also want
a poppet valve at the nozzle end that prevents the lube from flowing
until a pressure pulse causes it to open. That way the lube can't
drain away slowly when the lube system is idle. Some jobs have long
run times using regular water soluble flood coolant with the MQL being
used for only 1 or 2 short operations, tapping for example.
So after my long winded post can anyone help?
Thanks,
Eric

Stepper driven syringe pump perhaps? For example:
http://www.syringepump.com/NE-1000.php
I tought about some sort of stepper driven piston but I need a larger
reservoir than a syringe. Maybe some sort valve that fills the syringe
when the stepper motor retracts the plunger when it has reached the
end of travel.
Eric

On Mon, 12 Dec 2016 21:41:07 -0500, wrote:

On Mon, 12 Dec 2016 21:37:02 -0500, wrote:

On Mon, 12 Dec 2016 17:49:24 -0800 (PST), "
wrote:

On Monday, December 12, 2016 at 5:52:11 PM UTC-5, wrote:

So after my long winded post can anyone help?
Thanks,
Eric

Zt sounds as if you are going to need at the very least a timer. Perhaps some intelligence.

Consider using an Arduino. they aer dirt cheap microcontrolers. The cheapest one can work as a timer and can be set to 1/1000 of a second to any reasonable length of time. I do not remember the exact number but the max time is measured in days. They are easy to program, And I will help you.

Dan
With a tube/roller pump you just need to control the speed of
whatever motor you are using. About the simplest low pressure low
volume pump you can get - and it can be a steady flow, as compared to
pulsed outpot with either a double loop or double roller setup


AKA Peristaltic pump. As low as about 6 bucks on EBay - up ton several
thousand - - - -
I thought about peristaltic pumps but the tubing doesn't seem to last.
And I think a pulsing pump might be better since I'm only needing a
drop or two at a time.
Eric

wrote in message ...

On Mon, 12 Dec 2016 21:41:07 -0500, wrote:

On Mon, 12 Dec 2016 21:37:02 -0500, wrote:

On Mon, 12 Dec 2016 17:49:24 -0800 (PST), "
wrote:

On Monday, December 12, 2016 at 5:52:11 PM UTC-5,
wrote:

So after my long winded post can anyone help?
Thanks,
Eric

Zt sounds as if you are going to need at the very least a timer. Perhaps
some intelligence.

Consider using an Arduino. they aer dirt cheap microcontrolers. The
cheapest one can work as a timer and can be set to 1/1000 of a second to
any reasonable length of time. I do not remember the exact number but
the max time is measured in days. They are easy to program, And I will
help you.

Dan
With a tube/roller pump you just need to control the speed of
whatever motor you are using. About the simplest low pressure low
volume pump you can get - and it can be a steady flow, as compared to
pulsed outpot with either a double loop or double roller setup


AKA Peristaltic pump. As low as about 6 bucks on EBay - up ton several
thousand - - - -
I thought about peristaltic pumps but the tubing doesn't seem to last.
And I think a pulsing pump might be better since I'm only needing a
drop or two at a time.
Eric
================================================== =====================

First estimate a flow rate. I think you said something about a drop every
second or two. Using an old fashioned eye dropper the rule of thumb was 20
drops to the mL, or 50 microliters per drop, but I always thought those were
pretty big drops :-). As a swag, lets say 10 uL per drop, and a drop every
two seconds or 30 drops per minute, so 10 uL/drop * 30 drops/min = 300
uL/min as a typical flow rate, with max and min maybe a factor of 10 up and
down. Next, decide if you want pulsed flow, a squirt at a time, or
continuous flow. If you want squirts, you need 10 uL per squirt and maybe
some kind of variable stroke piston pump driven by a solenoid, but that's
going to be a pretty tiny bore and a very short stroke, plus check valves
that barely crack and then reliably re-seal. If you want continuous flow,
maybe you could adapt the smallest gear type automotive oil pump - connect
up a dc motor with a big reduction gear ratio and vary the voltage to vary
flow. You will have internal leakage but that won't hurt anything, you just
spin it a tad faster to get your desired output flow. Might not be able to
get the flow down enough. 0.3 mL/min is in the range used for conventional
HPLC (high pressure liquid chromatography, say 0.1 to 10 mL/min and up to
5000 psi which you don't need), so you could buy a used HPLC pump off of
ebay. I saw some Altex 110's for under $100, and Eldex has some cheap
models, too. Course the risk there is you may have to rebuild the pump head
which could be $$. Another possibility is to use the nebulizer air flow as
an aspirator. Turn the air on all the time and use a needle valve to
control the continuous flow, or use a solenoid valve to pulse the air flow
with the same needle valve for control. Or, door number 3, buy this little
oil rated gear pump off aliexpress for $10 and see if you can turn the flow
down enough:
https://www.aliexpress.com/item/gear...a-3417c0ad409f.

-----
Regards,
Carl Ijames

On Wed, 14 Dec 2016 10:01:47 -0800, wrote:

On Mon, 12 Dec 2016 21:41:07 -0500, wrote:

On Mon, 12 Dec 2016 21:37:02 -0500, wrote:

On Mon, 12 Dec 2016 17:49:24 -0800 (PST), "
wrote:

On Monday, December 12, 2016 at 5:52:11 PM UTC-5, wrote:

So after my long winded post can anyone help?
Thanks,
Eric

Zt sounds as if you are going to need at the very least a timer. Perhaps some intelligence.

Consider using an Arduino. they aer dirt cheap microcontrolers. The cheapest one can work as a timer and can be set to 1/1000 of a second to any reasonable length of time. I do not remember the exact number but the max time is measured in days. They are easy to program, And I will help you.

Dan
With a tube/roller pump you just need to control the speed of
whatever motor you are using. About the simplest low pressure low
volume pump you can get - and it can be a steady flow, as compared to
pulsed outpot with either a double loop or double roller setup


AKA Peristaltic pump. As low as about 6 bucks on EBay - up ton several
thousand - - - -
I thought about peristaltic pumps but the tubing doesn't seem to last.
And I think a pulsing pump might be better since I'm only needing a
drop or two at a time.

Eric, maybe you could set up a tiny fuel injector for that use. A
pulse from the requisite Arduino circuit board would time it. That
would be tons cheaper than even a used medical pump.

They weren't pervasive back when I quit wrenching, so I never worked
on them.

--
Happiness lies in the joy of achievement and the thrill of creative effort.
-- Franklin D. Roosevelt

On Wed, 14 Dec 2016 09:23:52 -0800, wrote:

On Mon, 12 Dec 2016 19:41:26 -0500, Ned Simmons
wrote:

On Mon, 12 Dec 2016 14:52:09 -0800, wrote:

MQL, Near Dry Machining, are two of the terms used for describing
a machining method that uses a very low amount of cutting fluid that
is applied right at the point of cutting. A nozzle is positioned where
the cutting lube is to be applied and the lube is delivered along with
low pressure air so that the fluid is dispersed a little.
Different methods of metering the fluid are used. I have an air
powered unit that meters the fluid through a valve and the fluid
drops pass through a chamber so that they can be counted. The fluid is
then carried through a tube with low pressure air to the nozzle which
blows the fluid onto the desired area. The fluid is broken up into
tiny drops by the passage through the tube along with the air. But
they should be smaller.
Another machine uses an air powered piston pump that delivers the
lube through a tube that meets another tube with air flowing out and
the two flows are mixed at the nozzle.
I used to have a piston pump machine but it failed and the maker
considered it to be non-repairable and so did not offer any repair
parts. That machine got thrown away.
The one I have now has needed to be sent back twice to the maker to
be rebuilt because they would not sell some proprietary seals.
The units are quite expensive and now it looks like I am going to
need a couple more. So I want to make them myself. Especially because
even if I buy a couple they will most likely not meet my needs exactly
so the installation will be a compromise.
I ahve been looking online at metering pumps but they are all
really expensive. Part of the reason is because they are very
accurate. I don't need the accuracy the uniits provide. I just need to
dispense small drops of lube into an air stream. I don't need an air
powered unit either. A solenoid powered pump would be fine. I have
looked at peristaltic pumps but I don't think one would work the way I
want. I think something that works similar to an atomizer on a pump
bottle would work well. I'm pretty sure I can buy atomizer nozzles
small enough. I would like to deliver through a flexible tube at high
enough pressure for the atomizer nozzle to work properly. I also want
a poppet valve at the nozzle end that prevents the lube from flowing
until a pressure pulse causes it to open. That way the lube can't
drain away slowly when the lube system is idle. Some jobs have long
run times using regular water soluble flood coolant with the MQL being
used for only 1 or 2 short operations, tapping for example.
So after my long winded post can anyone help?
Thanks,
Eric

Stepper driven syringe pump perhaps? For example:
http://www.syringepump.com/NE-1000.php
I tought about some sort of stepper driven piston but I need a larger
reservoir than a syringe. Maybe some sort valve that fills the syringe
when the stepper motor retracts the plunger when it has reached the
end of travel.

Any porting of the syringe body to refill would end up in lots of
leakage as you reinserted the plunger beyond it. :-/

--
Happiness lies in the joy of achievement and the thrill of creative effort.
-- Franklin D. Roosevelt

In article ,
Larry Jaques wrote:
I tought about some sort of stepper driven piston but I need a larger
reservoir than a syringe. Maybe some sort valve that fills the syringe
when the stepper motor retracts the plunger when it has reached the
end of travel.

Any porting of the syringe body to refill would end up in lots of
leakage as you reinserted the plunger beyond it. :-/

Valve would be on a tee off the output. or rather, valves, plural - one
to stop suck-back form the output, one to allow suck-in but prevent
outward flow on the reservoir. Not a novel problem.

I think combining two of the other answers gets a better result - use a
pump such as as a vehicle oil pump to develop pressure into a manifold,
and provide an over-pressure bleed back to the reservoir rather than
trying to throttle it down. Then plug a fuel injector into the manifold.

--
Cats, coffee, chocolate...vices to live by
Please don't feed the trolls. Killfile and ignore them so they will go away.

On 12/14/2016 1:01 PM, wrote:
I thought about peristaltic pumps but the tubing doesn't seem to last.
And I think a pulsing pump might be better since I'm only needing a
drop or two at a time.
Eric


No suggestion as to tubing life, but as to pulsing: you could drive it
with a stepper motor & control the size of drop and frequency.

On Thu, 15 Dec 2016 10:15:05 -0500, Bob Engelhardt
wrote:

On 12/14/2016 1:01 PM, wrote:
I thought about peristaltic pumps but the tubing doesn't seem to last.
And I think a pulsing pump might be better since I'm only needing a
drop or two at a time.
Eric


No suggestion as to tubing life, but as to pulsing: you could drive it
with a stepper motor & control the size of drop and frequency.
The beauty of most of the (at least cheaper) peristalic pumps is the
tubing is easily replaced and VERY cheap - and you CAN use differnt
tubing for different chemical makeup. A PWM controller can control the
speed of the little DCPM motors quite well, so if sized appropriately
you can control the coolant delivery very well - and they ARE
available with stepper drives or geared drives - but significantly
more money.