[Marmot_Militia]

Machinists,
Mach 3
Geko drivers
Keling steppers
10tpi ballscrews all around.

Tried setting 10000 steps and came up short of moving 1-inch. Is this just a ballpark first setup rule or should it really be 10000? I kept increasing steps till I got 1-inch and they total 10160 on all three axis.

What could be causing this?

I recently had the ball screw re-ground and re-balled and it's still the same as before, takes 10160 to move an inch.

Thanks for your help.

MM

[tauntdesigns]

Sounds like your ballscrews are metric 5mm per rev. If this is the case then they should be 10160 steps for 1 inch.

I have metric screws (5mm per rev) on my mill and it's set at 10160 steps. I have english ballscrews (5 tpi) on my lathe and it is set to 10000 steps.

cheers,
Jack

[jalessi]

Jack is correct, your machine has a 5mm metric screw.

See attached pdf.



Jeff....

[Marmot_Militia]

Makes sense now.

Guess I gotta go find what's causing my x-axis mistakes...holes are oblong.

Took the table off and checked the ballscrew...looks and feels solid as a rock. Thought my bearings may be loose but they are tight. I think I'll replace them anyway since it's open.

Any other ideas why the x-axis would be so sloppy after puttng on new ballnut and reground screw?

Regards,
MM

[Adobe Machine]

MM. All else being correct bearings etc did you install oversize balls in the system ?

Adobe (old as dirt)

[Marmot_Militia]

I sent it to a local ballscrew repair shop and they did it all for me. They reground and added larger balls.

Regards,
MM