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« on: February 27, 2013, 07:18:18 AM »
Hi All
Hope somebody can help here. Have finally got my lathe working but accuracy is a real problem.
This lathe was set up by a UK company who had never done one before and are pretty much no help at all. So its down to me.
Lathe is an Optimum 320X930
According to the company who supplied it ,its 5mm thread ball screws on X & Z.
Z has 40 tooth pulley on the screw and 20 tooth on the motor, Stepper on Z is 8.2Nm 1:8 degree. Stepper on X is 1:8 degree 4.2Nm, they said that X is directly connected, I can see a gear box but the motor is offset from the screw so I don't think it is direct, unless this setup is considered direct, I don't know.
Z has a belt between the screw pulley and the pulley on the motor shaft.
The engineer is Polish and speaks virtually no English so this is not easy at all. He also hasn't got a clue about inches and is a mm guy. I work in inches.
He worked out some step figures and we put them into the software, I'm currently measuring and changing numbers and getting nowhere fast.
I have a dial indicator on x and z, x is giving me a real problem as if I set the steps per, so it moves .1'' its perfect, however if I then move it .4'' its .002'' over.
I'm not sure Z is right either.
Z .600'' cuts .606'' and X .500'' diameter cuts .484'' so it no way correct.
I have backlash turned off, mechanically everything seems solid though and the build is good.
Hoping somebody can point me in the right direction.
Thanks
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