Mach3 - weird coodinate shift with inch/mm gcode change

[CnCAbc]

Well then I think that the steps per are wrong on the drives

I set them using the "Set steps per unit" feature, under the settings tab. It's like they're X10.
My driver are set to 1/8 (1600 pluse/Rev) .
I am using Tr8*8-2p (4 starts). And nema 23 @ 1.8°

[hanermo2]

The co-ord stuff and scaling is sometimes iffy.
Mostly, it is not wrong, necessarily.

If the machine was set up with a certain abs. position, homed, then you use a different offset g54xx, it is unclear which units should be used.

Since the work co-ords are not tied to a scalar, how is the sw to know what is/was the correct offset base in global terms.
If a work co-ord is offset say 10,0 mm, and I switch to imperial, should the offset base adjust by /25.4. Why ?

Likewise, should the machine global values adjust, or not ?
Why ?

If the home switch in z is offset 10.000- mm in z, metric, and I switch to imperial, should the home-pos value adjust ?
If I read in the value into a parameter say #3000, should that number adjust ?
Why ?

I am NOT saying it is right, logical, correct.
What I am pointing out is that it is very complex with no clear right answers, mostly.

The UCxxx, and the chinese offline controllers, are mostly much less complex and don´t support a lot of the features in gcode.

[magicniner]

Good call Clive!
I rarely think of the basic machine set up being at fault! :D

[CnCAbc]

Good call Clive!
I rarely think of the basic machine set up being at fault! :D

I got it figured out! It was an extra decimal point. i.e step per was set 2000.xxx instead of 200.xxx
I guess, I assumed the step per start at 1600 and goes up.

Appreciate your help, everyone!

Now the step per is resolved, I need help to figure out why everything except square, rectangle, and straight lines come up deformed.

The shapes below were supposed to be 20mm circle, and 20x20x20mm triangle.

[Clive S]

Now the step per is resolved, I need help to figure out why everything except square, rectangle, and straight lines come up deformed.

Could be missing steps ie. acceleration too high or voltage to the steppers too low. Or even excessive backlash. Or couplings loose on the motors.

Glad you got the steps per right now.

[CnCAbc]

Could be missing steps ie. acceleration too high or voltage to the steppers too low. Or even excessive backlash. Or couplings loose on the motors.

Glad you got the steps per right now.

How to sort them out?
The only things I'm sure is not the issue, are the voltage to steppers and coupling, the seems/feel tight/fine.

[Clive S]

How to sort them out?
The only things I'm sure is not the issue, are the voltage to steppers and coupling, the seems/feel tight/fine.

Well you was sure the steps were fine before. Post a pic. of the machine also what drives and what is the voltage supplying them. What is the acceleration settings in Mach.

Have you measured if the actual distance is the same for X100 and Y100

We don't have crystal balls to see these things.

[magicniner]

We don't have crystal balls to see these things.

Yours in the shop for repair too? ;-)

[Clive S]

Yours in the shop for repair too? ;-)

NO mine are in the pawn shop

[CnCAbc]

I give you this one! I will double check everything and post pictures by tomorrow.

Don't tell me the crystal ball I recently purchased from the pawn shop was yours? lol

Thanks for taking the time to help!