06-11-2015, 09:32 AM
I had originally built a power drawbar for my PM935TV mill when I set it up last year. However, after seeing one on youtube that a guy made and liking his design much better than my own, I decided to copy it. Thanks to Colin @ Comp Edge X.
My original design used a 1" stroke pneumatic cylinder to push from the to down and force the socket onto the drawbar as well as pop it loose from the taper. This one mounts the pneumatic cylinder next to the pneumatic butterfly and "pulls" the butterfly down along with the socket mating with the drawbar and popping it loose from the taper.
This is not recent as I actually fabricated this power drawbar about 7 or 8 months ago and have been using it ever since. I am new here so I thought I would throw it in the projects section.
Here are my preliminary drawings for the base plate and top plate along with all of the ports and screw holes for the butterfly air gun.
![[Image: 212vm29.jpg]](http://i62.tinypic.com/212vm29.jpg)
![[Image: 14muype.jpg]](http://i61.tinypic.com/14muype.jpg)
Top plate roughly layed out. I will get exact once I put it on my mill table and indicate off measurements exactly using the DRO.
![[Image: 2vun5f7.jpg]](http://i61.tinypic.com/2vun5f7.jpg)
Top plate machined to size and drilled/tapped for the butterfly air ratchet.
![[Image: 2430ytw.jpg]](http://i57.tinypic.com/2430ytw.jpg)
Bottom plate machined to size and drilled for the mounting location as well as the holes drilled and countersunk for the vertical guide rods. Also pictured are the guide rods.
![[Image: sxm986.jpg]](http://i62.tinypic.com/sxm986.jpg)
Guide rods mocked into position. Bronze and brass in the background to be used for the bushings and the "tees" for the fittings.
![[Image: 20k7jmg.jpg]](http://i61.tinypic.com/20k7jmg.jpg)
Completed unit and bolted on the mill.
![[Image: 245y2xi.jpg]](http://i60.tinypic.com/245y2xi.jpg)
Looks much better than my first attempt and it works just as well.
I also have a youtube video of Part 1 and Part 2 if you search under my username "zmotorsports".
Mike.
My original design used a 1" stroke pneumatic cylinder to push from the to down and force the socket onto the drawbar as well as pop it loose from the taper. This one mounts the pneumatic cylinder next to the pneumatic butterfly and "pulls" the butterfly down along with the socket mating with the drawbar and popping it loose from the taper.
This is not recent as I actually fabricated this power drawbar about 7 or 8 months ago and have been using it ever since. I am new here so I thought I would throw it in the projects section.
Here are my preliminary drawings for the base plate and top plate along with all of the ports and screw holes for the butterfly air gun.
Top plate roughly layed out. I will get exact once I put it on my mill table and indicate off measurements exactly using the DRO.
Top plate machined to size and drilled/tapped for the butterfly air ratchet.
Bottom plate machined to size and drilled for the mounting location as well as the holes drilled and countersunk for the vertical guide rods. Also pictured are the guide rods.
Guide rods mocked into position. Bronze and brass in the background to be used for the bushings and the "tees" for the fittings.
Completed unit and bolted on the mill.
Looks much better than my first attempt and it works just as well.
I also have a youtube video of Part 1 and Part 2 if you search under my username "zmotorsports".
Mike.