Looking good!
Jack
I am in the process of a CNC conversion and thought id share what i have. Comments are welcome!
Im using the 4030's from Keling and the 425oz motors. Everything is powered with 3 computer PSU's in series for 36v. The power supplies are controlled with an optoisolator board that I made for this project
Folder of pics here: http://www.rfhv.com/cnc/
http://youtube.com/user/cr99991
Last edited by christofer; 07-16-2008 at 02:53 AM.
Looking good!
Jack
Walking is highly over-rated
Looks like it's well on it's way
The z axis is always the biggest pita when converting an X2. Your method is much like the cncfusion idea. Are you planning to go 1:1 with the z or use a belt and pulleys to get some other ratio? The ballnut mounting block doesn't appear to be threaded, curious how you plan to mate those pieces.
I copied the counter weight idea shown here this weekend
took the plunge
Cheap and effective.
Anyone who says "It only goes together one way" has no imagination.
What type of ballscrew system are you using? Have a site or anything form them...
-Jason
Thanks for the replys.
The motor will be mounted directly above the ball screw shaft with a 1:1 ratio. The ballnut mounting block is actually threaded for the 15/16-16 ballnut. I had not planned on using a counter weight but if my motor has problems moving the head, I may use an air spring.
My ballscrews are from McMastercarr. I probably should have gone for the Roton ones because they look a little nicer, but I think the one I have should get the job done.
How much backlash ( if any) do you have on your ballscrews?
I did a conversion on my lathe with some screws similar to yours (mine are Thompson) and found .005" backlash. I'm going to put a double nut on my z-axis and replace the balls in the x-axis nut with larger balls to take out the backlash.
Cheers,
Jack
Walking is highly over-rated
I am only using a ball screw on the Z. The X and Y are stock. I have no idea how much backlash my Z screw will have tho. Hopefully the weight of the head will make the backlash less of an issue. I have about .006" of backlash on the X and Y, but mach 3 seems very good at eliminating it.