CNC Roatary table

I have an enco 8X36 knee mill retrofitted with ballscrews on the XY axis. I installed my 3 axis servo control unit that uses G320s. I have used this set up for quite a few years and it works quite well. Since my control box is all set up for adding a 4th axis I decided to finally buy a Phase 2 rotary table and use it on my enco mill but could also use it on my retrofitted Journeyman Tree Mill. I had purchased an 8" model several months ago when they were on sale. I finally got around to retrofitting the phase 2 Rotary table. Since I don't like to reinvent the wheel I searched the web to see if I could find a good design that someone put on their web site. To my surprise I could not find any plans or even pictures of rotary tables that were modified for CNC.
Coincidentally, I have a friend that dropped by with his 6" phase 2 CNC table and wanted me to rewire his stepper motor to work with his control unit. I noticed that his stepper motor was mounted on a plate that was secured to the eccentric bushing that rotates the worm in or out from the worm wheel. I also noticed that with the plate in a certain position it would be close to touching the mill table if the rotary table was used in the horizontal position. I decided to design my own that was similar but with more offset so the plate would always clear the table. I machined the mounting plate and installed in on the rotary table. I have it adjusted so there is barely any detectable backlash when I rock the table CW-CCW. I used a 680 oz in stepper motor that I had laying around but will probably replace it with a nema 34 servo motor.
Other than the motor mounting plate, I bored a 60XL037 aluminum pulley for a press fit over the handwheel hub. If you are interested in retrofitting your 6,8 or 10 inch Phase 2 rotary table contact me off line and I'll give you a copy of my drawing in dxf format.

Dan Mauch
economical 3D scanner software and kits
low cost stepper and servo motors.
cases for Gecko drives
kits and assembled 3-4 axis drives
www.camtronics-cnc.com
www.seanet.com/~dmauch


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