Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: waynep on December 05, 2019, 12:33:44 PM
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I just completed setting up a new cnc machine it uses a tp8x8 p2 leadscrews. I configured Mach3 and ran a sample. Everything functioned except sample was a 1x1" block .625 deep. It measures 1.25 x 1.25 . Where did I go wrong?
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Hi,
you have calculated the <steps per unit> value incorrectly.
You say you have 8TPI leadscrews, are they two start?
Are your steppers direct coupled to the lead screw or do you have a gear or belt reduction?
What microstepping regime are you using?
With these numbers it possiblt to calculate the required <steps per unit>.
Craig
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Thanks for the quick response. The leadscrews are coupled to nema 23 motors and they are 2 start. I have no idea what microstep regime is?
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Hi,
I have no idea what microstep regime is?
If you don't know you need to find out. How did you set the <steps per unit> value in Mach motor tuning pages WITHOUT
knowing?
The microstepping regime is the number of pulses required to cause the stepper to rotate 1 turn. Most normal two phase steppers
require 200 pulses, this is called fullstep. If the drive is set to half step it would require 400 pulses. 1/4 step 800 pluses and so on.
A good middle of the road setting is 8 microsteps per fullstep or 1600 pulses per rev. You need to set the microswitches on your drive
to do that.
Craig
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Multiply your current steps per by 0.8 and try that.