Cant save UM Value less than 1.0000

[erphillips]

Trying to set the scale correctly on my X7 DSP Controlled laser

My 100mm x 100mm box cuts at 80.5mm

I need to set the UM to .80500 for based on the built in calculator

It will not save to the controller always defaults to 1.0 if set to anything less then 1.0

If I set it to 1.61 then I get a box exactly 50mm x 50mm as expected

What could be causing the less than 1.o setting to not be allowed?

I have tried setting it directly in the X7 and in lasercad always defaults back to 1.0 if set to anything less than 1.0

Drivers set to use 3200 Steps if I set to 1600 Steps it wants an even smaller value in UM
If I set to 800 Steppers will not run at all just locks up

Thanks
Ed

[erphillips]

I was able to change my drivers to a setting where I could use 3.2 for my UM

All good now

I found some post related to Z axis that said you could not use less then 1.0 UM

Thanks
Ed

[Tech_Marco]

2.0 is the lower number or 28.5 is the higher you can set. Lower than that the machine may not be stable

Marco

[erphillips]

I ended up at 3.2 UM so I should be good

Still some final testing to do but It is really close for now