I tracked down pneumatic rotary actuators that have the rack gear built in and
other niceties like cushions and stops. Thanks for the pointers! I talked to a
couple of manufacturers and they balked at 300 ms stroke time. The idea of a
cylinder attached to a crank arm and one-way clutches seems to be the front
runner, it's simple, accurate, reliable and cheap. This will be the fourth
generation for this mechanism. Each newer one is simpler and better than the
previous. I wonder what the fifth will look like?

"Tom Gardner" wrote in message
...
I tracked down pneumatic rotary actuators that have the rack gear built in and
other niceties like cushions and stops. Thanks for the pointers! I talked to
a couple of manufacturers and they balked at 300 ms stroke time. The idea of
a cylinder attached to a crank arm and one-way clutches seems to be the front
runner, it's simple, accurate, reliable and cheap. This will be the fourth
generation for this mechanism. Each newer one is simpler and better than the
previous. I wonder what the fifth will look like?

http://metalworking.com/Dropbox/_200...0-wirefeed.JPG
Here's a pic of the first generation. Notice the air cylinder, the one set of
spring loaded pinch rollers moves back and forth and one set is stationary.
There are one-ways in the rollers. It works but if the wire it's feeding is too
oily or too dry or has lead-drag or soft spots or hard spots or crooks or twists
or if it's Tuesday or...

"Tom Gardner" wrote:

http://metalworking.com/Dropbox/_200...0-wirefeed.JPG
Here's a pic of the first generation. Notice the air cylinder, the one set of
spring loaded pinch rollers moves back and forth and one set is stationary.
There are one-ways in the rollers. It works but if the wire it's feeding is too
oily or too dry or has lead-drag or soft spots or hard spots or crooks or twists
or if it's Tuesday or...


Who is the artist?

Wes

Tom, Does this unit go back and forth continuously at a set speed? If
so,take a look at fabric loom operation, about 900 cycles/min. I could sort
of describe the mechanism to you. better yet, get the book of ingenious
mechanism.

Karl

Tom Gardner wrote:

http://metalworking.com/Dropbox/_200...0-wirefeed.JPG

One could replace the pinch rollers with a gripper, yes?
http://www.emiplastics.com/eoat_spruegrip.htm

Oooh baby, Pheuma-Nippers!
http://www.emiplastics.com/eoat_nipper.htm

Gripper - Nippers!!
http://www.emiplastics.com/pdfs_eoat...p0710_0711.pdf


--Winston

"Wes" wrote in message
...
"Tom Gardner" wrote:

http://metalworking.com/Dropbox/_200...0-wirefeed.JPG
Here's a pic of the first generation. Notice the air cylinder, the one set of
spring loaded pinch rollers moves back and forth and one set is stationary.
There are one-ways in the rollers. It works but if the wire it's feeding is
too
oily or too dry or has lead-drag or soft spots or hard spots or crooks or
twists
or if it's Tuesday or...


Who is the artist?

Wes

One of the lady's grandson.

"Winston" wrote in message
news:fhv9k.90$HY.60@trnddc01...
Tom Gardner wrote:

http://metalworking.com/Dropbox/_200...0-wirefeed.JPG

One could replace the pinch rollers with a gripper, yes?
http://www.emiplastics.com/eoat_spruegrip.htm

Oooh baby, Pheuma-Nippers!
http://www.emiplastics.com/eoat_nipper.htm

Gripper - Nippers!!
http://www.emiplastics.com/pdfs_eoat...p0710_0711.pdf


--Winston

Looking at those make my nipples hurt!

Tom Gardner wrote:

Looking at those make my nipples hurt!

Must. Lose. Mental. Image!

--Winston

On Sat, 28 Jun 2008 03:54:43 -0400, "Tom Gardner"
wrote:
snip
Each newer one is simpler and better than the
previous. I wonder what the fifth will look like?
======
How about a linear motor?
http://www.baldor.com/products/linear_motors.asp
http://www.tecnotion.com/?gclid=COGz...FRIuagodzDkJtA
http://www.linmot.com/lm_typo/index.php


Unka' George [George McDuffee]
-------------------------------------------
He that will not apply new remedies,
must expect new evils:
for Time is the greatest innovator: and
if Time, of course, alter things to the worse,
and wisdom and counsel shall not alter them to the better,
what shall be the end?

Francis Bacon (1561-1626), English philosopher, essayist, statesman.
Essays, "Of Innovations" (1597-1625).

Wow! 5 million cycles for under $200 I like RELIABLE and CHEAP products!

Winston wrote:
Tom Gardner wrote:

http://metalworking.com/Dropbox/_200...0-wirefeed.JPG

One could replace the pinch rollers with a gripper, yes?
http://www.emiplastics.com/eoat_spruegrip.htm

Oooh baby, Pheuma-Nippers!
http://www.emiplastics.com/eoat_nipper.htm

Gripper - Nippers!!
http://www.emiplastics.com/pdfs_eoat...p0710_0711.pdf


--Winston

RoyJ wrote:
Wow! 5 million cycles for under $200 I like RELIABLE and CHEAP products!


I dunno, it costs a whopping $18 to $57 for them to refurbish the nipper blades...

http://www.emiplastics.com/pdfs_eoat...p0806_0807.pdf


Yes. I am trying to be funny.


Check out those size 50's OMG

http://www.emiplastics.com/pdfs_eoat...p0728_0776.pdf




--Winston