ben machine was displaying 5mm after being homed. if he sends the machine to 1780,its actualy going to move +1775 and display 1780
Understood. That way will not result in an accurate calibration.
He should have the mpos set to 0 after homing and pull off. Now any other error he has is to be managed other way. Mechanical issues i suspect.
Why? Then you have 5mm of unused machine.
Hi Ryan,
I do not understand either (but I am a noob).
Here are my observations, keeping in mind that I swapped the axis.
mpos_mm = 3
- Homed the X-axis, the bit is exactly at 0
- Did a G0 X1780, the bit is at 1875.5
- A G0 X0 brings it back to 0
mpos_mm = 0
- Homed the X-axis, bit = 0
- G0 1780 brings it to 1778.5
- BUT, G0 X0 does not bring it back to 0, but rather 3
So, keeping mpos_mm = 3
& adjusting the steps_per_mm
- In my case, 1780/1775.5 = 1.002534 x 50 = 50.127 steps/mm
- The G0 1780 is then accurate, and so is the G0 X0 back!!
Thanks to you again for all you did & this community for helping noobs like me!
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Uh, that sounds like a whole lot of backlash.
Grub screws?
I am kind of ruling out backlash or grub screws because this behavior is consistent and repeatable + the 3mm difference in the return to zero is equal to the change in mpos_mm from 3 to 0 → low probability of the backlash to be exactly 3mm, right??
I don’t know enough to be intelligent on this, just making observations and trying to understand what is going on.
He was moving his machine 3mm less if he sends 1780mm
I use my machines home location after pulloff to be the zero, and i place my spoilboard accordingly. I dont loose any space (in the v1 calculator i use 12mm extras for x&y
Now, ge solves his issue by adjusting the steps per mm, i guess we all need to fine tune things depending on what belts where in the hardware pack (its not your issue)
This is unique to you. I have the current jackpot firmware set up as he has it. To make use of every mm possible. How our instructions are set up has every job starting with G92.
Great!
Sorry for the mpos-mm confusion, Seems like you understand it now though.
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