Homemade power drawbar

[Servo Wizard]

BigVinney & HayreAss,

1st; Vince, a captive draw bar is forced to stay vertcally stationary while it forces the taper to break lock.

HayreAss; By design your power drawbar has all of the elements required to valve the action so that your motor does not spin until the socket has seated. In the attached picture you can see where I'm using the ram of one cylinder as a valve to control a secondary cylinder. The primary ram is the index locking pin which must be out prior to the indexing cylinder being actuated.

Good Work Guys,
Servo

[bigvinney]

Wow those are nice looking pieces. I am sure I could think of a way to keep the drawbar locked from going up but it seems to work fine so far, so if it becomes an issue I will draw up some plans to keep it in place. As for the socket grasping the drawbar, there had been no issue with it not seating properly yet. I dont have the means of taking a video of it working but from my first tests, the cylinder actuates and about a half second later the impact starts to spool up at 90 psi.

[Servo Wizard]

BigVinney,

Sounds like it fits in the "If ain't broke then don't fix it" category.

Servo

[bigvinney]

I'll agree with that servo, seems to work fine so I will leave it until it malfunctions, or I am bored and feel like making something, which happens to be all the time

I never touched a mill before 4 months ago and now I cant stop customizing and playing with it. Now only if I could just win the lotto and get nice little haas vmc.

[wildcat]

Originally Posted by bigvinney Here is a picture of the mill it is going on and also a picture of the air valves.

Your mill has belt drive right? Does your power drawbar interfere with changing the belts at all? How do you flip the top open?

BTW: The type of mill you have is my personal favorite for the size. Really neat to see that you CNC'ed it. Did you detail the conversion any where?

[bigvinney]

The belts and pullies sit about 1" below the cover so the drawbar does not interfere. I have latches on the side of the lid to make sure it stays shut when using the power drawbar, but I can unlock them and flip the top open if needed.

I did post a the final conversion pictures in another thread a few months ago but I did not go into details about it. Just do a search for G3102 and you should see it. If you have questions just let me know.

[rasta]

a captive drawbar is a normal drawbar that has a collar on top of it to stop coming up when it is undone, anyway if the
air cilinder that pushes the nutrunner down is big enough it will hold the drawbar down while it unlock the taper on the tool
again
good job
rasta