vacuum pumps
 

Anyone have experience with this model? Pro's?/con's?

Harbor Freight is usually not my first choice, but I'm looking there now.

vacuum pump model #98076-2vga. 2.5cfm, rotary-vane

http://www.harborfreight.com/cpi/cta...emnumber=98076

vacuum pumps
 

On Sep 16, 12:29*pm, "Joe" wrote:
Anyone have experience with this model? *Pro's?/con's?

Harbor Freight is usually not my first choice, but I'm looking there now.

vacuum pump model #98076-2vga. *2.5cfm, rotary-vane

http://www.harborfreight.com/cpi/cta...emnumber=98076

That would seem to be for a low vacuum application:

Atmospheric pressure 760 torr 101.3 kPa
Low vacuum 760 to 25 torr 100 to 3 kPa
Medium vacuum 25 to 1×10-3 torr 3 kPa to 100 mPa
High vacuum 1×10-3 to 1×10-9 torr 100 mPa to 100 nPa

vacuum pumps
 

On 2009-09-16, Joe wrote:

Harbor Freight is usually not my first choice, but I'm looking there now.

I'd go for it. Rotary vane pumps aren't rocket science. I doubt it
would pull 75 microns, but it should do what it was intended to, pull
moisture out of refrigeration lines. Just keep the oil fresh. Better
yet, invest in some high grade vac pump oil. If you can replace the
1/4" fitting with 3/8" and use corresponding sized hose, that would
work better. Besides, the worst you can say about it is, "it sucks".

nb

vacuum pumps
 

"Joe" wrote in message
...
Anyone have experience with this model? Pro's?/con's?

Harbor Freight is usually not my first choice, but I'm looking there now.

vacuum pump model #98076-2vga. 2.5cfm, rotary-vane

http://www.harborfreight.com/cpi/cta...emnumber=98076
Have you tried Viagra?

B.

vacuum pumps
 

"Buddy Matlosz" wrote in message
...

"Joe" wrote in message
...
Anyone have experience with this model? Pro's?/con's?

Harbor Freight is usually not my first choice, but I'm looking there now.

vacuum pump model #98076-2vga. 2.5cfm, rotary-vane

http://www.harborfreight.com/cpi/cta...emnumber=98076
Have you tried Viagra?

B.

LOL. You're confusing function with size.

Yeah, *this* isn't gonna start a whole new direction for the thread....

vacuum pumps
 

"Joe" wrote in message
...

"Buddy Matlosz" wrote in message
...

"Joe" wrote in message
...
Anyone have experience with this model? Pro's?/con's?

Harbor Freight is usually not my first choice, but I'm looking there
now.

vacuum pump model #98076-2vga. 2.5cfm, rotary-vane

http://www.harborfreight.com/cpi/cta...emnumber=98076
Have you tried Viagra?

B.

LOL. You're confusing function with size.

Yeah, *this* isn't gonna start a whole new direction for the thread....

Well, you never did say what you were trying to accomplish...........

B.

vacuum pumps
 

"Buddy Matlosz" wrote in message
...

"Joe" wrote in message
...

"Buddy Matlosz" wrote in message
...

"Joe" wrote in message
...
Anyone have experience with this model? Pro's?/con's?

Harbor Freight is usually not my first choice, but I'm looking there
now.

vacuum pump model #98076-2vga. 2.5cfm, rotary-vane

http://www.harborfreight.com/cpi/cta...emnumber=98076
Have you tried Viagra?

B.

LOL. You're confusing function with size.

Yeah, *this* isn't gonna start a whole new direction for the thread....

Well, you never did say what you were trying to accomplish...........

B.

Fair enough. Veneering and holding small workpieces in place for production
routing.

vacuum pumps
 

On Sep 18, 11:33*am, "Joe" wrote:
"Buddy Matlosz" wrote in message

...





"Joe" wrote in message
t...

"Buddy Matlosz" wrote in message
...

"Joe" wrote in message
. net...
Anyone have experience with this model? *Pro's?/con's?

Harbor Freight is usually not my first choice, but I'm looking there
now.

vacuum pump model #98076-2vga. *2.5cfm, rotary-vane

http://www.harborfreight.com/cpi/cta...emnumber=98076
Have you tried Viagra?

B.

LOL. *You're confusing function with size.

Yeah, *this* isn't gonna start a whole new direction for the thread.....

Well, you never did say what you were trying to accomplish...........

B.

Fair enough. *Veneering and holding small workpieces in place for production
routing.

That won't be enough vacuum IMHO.

vacuum pumps
 

On 2009-09-18, Joe wrote:

Fair enough. Veneering and holding small workpieces in place for production
routing.

Pshaw! Then you are wasting your money. You'd be better off using an old
vacuum cleaner thru vacuum cleaner hose.

nb

vacuum pumps
 

"notbob" wrote in message
...
On 2009-09-18, Joe wrote:

Fair enough. Veneering and holding small workpieces in place for
production
routing.

Pshaw! Then you are wasting your money. You'd be better off using an old
vacuum cleaner thru vacuum cleaner hose.

nb

I might as well. Ran it for 10 seconds and it started rattling and smoking.
first and last tool I ever buy from HF.

vacuum pumps
 

On Sep 18, 12:16*pm, "Joe" wrote:
"notbob" wrote in message

...

On 2009-09-18, Joe wrote:

Fair enough. *Veneering and holding small workpieces in place for
production
routing.

Pshaw! *Then you are wasting your money. *You'd be better off using an old
vacuum cleaner thru vacuum cleaner hose.

nb

I might as well. *Ran it for 10 seconds and it started rattling and smoking.
first and last tool I ever buy from HF.

Venturi based vacuum generators are cheap and reliable.

vacuum pumps
 

"Joe" wrote:

Fair enough. Veneering and holding small workpieces in place for
production routing.


For production, think Gast, thet are in a league by themselves.

HF vacuum pumps are toys.

Lew

vacuum pumps
 

On 2009-09-18, Joe wrote:

I might as well. Ran it for 10 seconds and it started rattling and smoking.
first and last tool I ever buy from HF.

That's what rotary vane pumps do when they've pulled a vacuum. The
smoking is oil vapor backstreaming. You should have said what you were
going to use it for in the first place. I thought you were going to
use it for pumping down refrigeration lines, its intended purpose.
Maybe HF will take it back. Tell 'em you didn't know about
backstreaming and can't tolerate any oil on the work.

nb

vacuum pumps
 

Joe wrote:

Fair enough. Veneering and holding small workpieces in place for production
routing.

I use a recycled refrigerator compressor with shop-built vacuum pucks
for holding (not small) workpieces for CNC routing with a 5 hp spindle.

The higher-volume shops like the vacuum pumps from

http://www.beckerpumps.com/

They're more expensive but those who have 'em, love 'em.

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto/

vacuum pumps
 

On Sep 18, 12:16*pm, "Joe" wrote:
"notbob" wrote in message

...

On 2009-09-18, Joe wrote:

Fair enough. *Veneering and holding small workpieces in place for
production
routing.

Pshaw! *Then you are wasting your money. *You'd be better off using an old
vacuum cleaner thru vacuum cleaner hose.

nb

I might as well. *Ran it for 10 seconds and it started rattling and smoking.
first and last tool I ever buy from HF.

Try one of these. (Btw.. the claim of 27"Hg is optimistic)
http://tinyurl.com/pgkqss

vacuum pumps
 

On 2009-09-18, Morris Dovey wrote:

http://www.beckerpumps.com/

They're more expensive but those who have 'em, love 'em.

You are paying insane amounts of money for vacuum overkill. A simple
vacuum cleaner will provide all the vacuum mecessary for holding down
verneer pieces, even lager ones. The mechanism at work here is not
vacuum. but the air pressure acting on the pieces to be held. IOW,
it's not the level or rate of vacuum, but the atmospheric pressure on
the other side of the work. You can buy a $10 million dollar vacuum
system, but the air pressure holding down the pieces will never exceed
14.7 psi.

nb

vacuum pumps
 

On Sep 18, 1:06*pm, Morris Dovey wrote:
Joe wrote:
Fair enough. *Veneering and holding small workpieces in place for production
routing.

I use a recycled refrigerator compressor with shop-built vacuum pucks
for holding (not small) workpieces for CNC routing with a 5 hp spindle.

The higher-volume shops like the vacuum pumps from

* *http://www.beckerpumps.com/

They're more expensive but those who have 'em, love 'em.

Yup, those are 'drool-grade'.
Used ones are quite reasonable...and parts are available all over.
One day, dammit...

vacuum pumps
 

notbob wrote:
On 2009-09-18, Morris Dovey wrote:

http://www.beckerpumps.com/

They're more expensive but those who have 'em, love 'em.

You are paying insane amounts of money for vacuum overkill. A simple
vacuum cleaner will provide all the vacuum mecessary for holding down
verneer pieces, even lager ones. The mechanism at work here is not
vacuum. but the air pressure acting on the pieces to be held. IOW,
it's not the level or rate of vacuum, but the atmospheric pressure on
the other side of the work. You can buy a $10 million dollar vacuum
system, but the air pressure holding down the pieces will never exceed
14.7 psi.

I don't do veneering, so you won't get any argument from me in that context.

Joe mentioned production routing small parts - and in that context, the
choice of equipment will depend very much on the particular set-up
(whole table, with vacuum being pulled through a permeable spoilboard;
vacuum pucks on an impermeable spoilboard; or something in-between); the
material being routed - parameters will be very different for, say,
Lexan, baltic birch, and MDF workpieces; and how aggressive the feed is.

I've been pretty happy with pucks and an old recycled refrigerator
compressor - but I don't use vacuum hold down for parts under 16 in^2,
and I can't even consider vacuum hold-down for leaky materials like 1/4
in MDF. (If I really needed to do that I'd spring for a real vacuum pump
- probably a reconditioned Becker.)

I have a how-to for making inexpensive vacuum pucks at
http://www.iedu.com/DeSoto/Projects/VacuumPuck/ - I just daisy-chain 'em
together and connect to the intake side of the refrigerator compresor
with 3/8 in vinyl tubing.

For non-production (very small) quantities, I'm more likely to use
carpet tape - or for in-between (small) quantities, a purpose-built
clamping fixture like those shown at
http://www.iedu.com/DeSoto/Projects/Bevel/

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto/

vacuum pumps
 

Robatoy wrote:
On Sep 18, 1:06 pm, Morris Dovey wrote:

Joe wrote:

Fair enough. Veneering and holding small workpieces in place for production
routing.

I use a recycled refrigerator compressor with shop-built vacuum pucks
for holding (not small) workpieces for CNC routing with a 5 hp spindle.

The higher-volume shops like the vacuum pumps from

http://www.beckerpumps.com/

They're more expensive but those who have 'em, love 'em.


Yup, those are 'drool-grade'.
Used ones are quite reasonable...and parts are available all over.
One day, dammit...


Bill Noble, one of the participants of rec.craft.woodturning, usually
has a few reconditioned Gast pumps on his web site at a decent price:

http://www.wbnoble.com/

Example:

"GAST 0523-IDQ-G21DX

220V, single phase, weighs 30 pounds

I measured 22 inches vacuum

Oilless carbon vane pump, if I read the spec sheet right, this is a 3.2
CFM free air flow pump, 10 psi max, 26 in vac max, so my 22 inch
measurement says it's in really good shape.

manual is he

http://www.gastmfg.com/pdf/OM/23_series_oilless_om.pdf

$165."

--
Jack Novak
Buffalo, NY - USA

vacuum pumps
 

Joe wrote:
"notbob" wrote in message
...
On 2009-09-18, Joe wrote:

Fair enough. Veneering and holding small workpieces in place for
production
routing.
Pshaw! Then you are wasting your money. You'd be better off using an old
vacuum cleaner thru vacuum cleaner hose.

nb

I might as well. Ran it for 10 seconds and it started rattling and smoking.
first and last tool I ever buy from HF.




Were you operating the pump with no load or connected to the intended
device?

I've rebuilt several direct and belt drive types. They can be a bit
noisy and smoky. Give it another try with the inlet completely blocked
(max load). Better yet, connect a vacuum gauge to the inlet and see what
its actually pulling.

John

vacuum pumps
 

"Joe" wrote in message
...

"notbob" wrote in message
...
On 2009-09-18, Joe wrote:

Fair enough. Veneering and holding small workpieces in place for
production
routing.

Pshaw! Then you are wasting your money. You'd be better off using an
old
vacuum cleaner thru vacuum cleaner hose.

nb

I might as well. Ran it for 10 seconds and it started rattling and
smoking. first and last tool I ever buy from HF.




I don't want to sing the praises of HF, and there are indeed things in their
store that I won't buy, but a great deal of what they sell is perfectly
acceptable stuff. What would you have said if a brand name item from a
major retailer failed like that in short order? It happens every day.

--

-Mike-

vacuum pumps
 

"Mike Marlow" wrote in message
...

"Joe" wrote in message
...

"notbob" wrote in message
...
On 2009-09-18, Joe wrote:

Fair enough. Veneering and holding small workpieces in place for
production
routing.

Pshaw! Then you are wasting your money. You'd be better off using an
old
vacuum cleaner thru vacuum cleaner hose.

nb

I might as well. Ran it for 10 seconds and it started rattling and
smoking. first and last tool I ever buy from HF.




I don't want to sing the praises of HF, and there are indeed things in
their store that I won't buy, but a great deal of what they sell is
perfectly acceptable stuff. What would you have said if a brand name item
from a major retailer failed like that in short order? It happens every
day.

--

-Mike-


And, to bolster your point, per another poster, the pump was actually
behaving the way it was supposed to. It was my fault for not knowing the
specifics of how that pump operates. Just frustration in the moment that
was talking there.

Live and learn.

jc

p.s. Any, yes, I did see some perfectly acceptable stuff in there as well,
just not the threaded plastic knobs for jigs and hold-downs that I was
looking for. Not their fault they don't carry them ;-)