View Full Version : Kreg K4 pneumatic conversion

stan shields
12-09-2017, 7:45 PM
Been lusting after one of those old Kreg pneumatic clamps but they are tough to find. I bought this spring-return cylinder for $20 on ebay. It is held in place by two copper pipe stand-offs but it could just as easily be mounted with a couple of wooden supports. I liked the pipe clamps because I can reposition the cylinder if need be. The rubber foot came from frightprops.com I bought a foot-controlled valve for $10.

William Sonnier
01-01-2018, 4:35 PM
Very nice!!! Have you had a chance to use it yet?

jack duren
01-01-2018, 5:07 PM
You should make one of these an add pneumatics...

Hilton Ralphs
01-02-2018, 2:23 AM
When you release the foot pedal, does enough air escape to cause the pump to retract? Looks pretty awesome though.

Edit: I saw you mentioned a spring return, so that's my answer.

stan shields
01-02-2018, 11:50 AM
Yeah, I bought a pedal that you have to keep your foot on to allow air to pass to the cylinder, I put a regulator between the pedal and the cylinder, been experimenting with how much pressure is needed, seems like 20-25 LBs is plenty. The pedal releases the pressure in the output line past the actuator when you lift your foot.
Works great, shoulda done this years ago :-)

Hilton Ralphs
01-02-2018, 1:11 PM
Thanks Stan.

William Sonnier
01-05-2018, 6:11 PM
Do you have the model number for the cylinder?

stan shields
01-05-2018, 6:31 PM
Here ya go:
https://www.ebay.com/itm/UP-TO-2-NEW-BIMBA-2-1-2-STROKE-SPRING-RETURN-STAINLESS-AIR-CYLINDERS-092-5/272769197119?hash=item3f824fa43f:g:yrEAAOSwXk5ZcBg J

William Sonnier
01-06-2018, 12:34 PM
Thanks for the info! My son moved to Colorado a few years ago to take luthier classes. He made a few guitars, but he also learned how to make drum shells, which seems to be his passion now.