Calculating steps per mm

[Feynman137]

I am trying to alter the steps per mm portion of the config file to finish setting up my core-xy printer, but could use some help. I noticed that x and y axis are defaulted to 80 steps per mm but I am not sure how this is calculated.

The pulley on the x and y axis is a GT2 pully with 40 teeth. The GT2 belt has 2mm pitch and with 40 teeth this means after a complete pulley rotation the belt will move 80mm. But how many steps per rotation? The stepper has 200 steps per rotation but does the calculation consider microstepping?

[fcwilt]

@feynman137

Hi.

Here is a link to a page that has a "calculator" for this sort of thing.

Calculator

[Phaedrux]

You can give this one a shot too if you want to see the formulas behind the scenes.

https://docs.google.com/spreadsheets/d/1ts5fz73JQoQ4G0Z95nzfPDSS6HYEyczyZyccDZ5M6B4/edit?usp=sharing

[Feynman137]

@phaedrux @fcwilt Thanks guys just checked it out looks like I'm at 40xy steps per mm and 5mm traveled per rev. A bit confused as to what these terms mean..

Assuming it means that hot-end travels a 1mm diagonal line in the xy plane with 40 steps from both x and y steppers?

[fcwilt]

@feynman137 said in Calculating steps per mm:

@phaedrux @fcwilt Thanks guys just checked it out looks like I'm at 40xy steps per mm and 5mm traveled per rev. A bit confused as to what these terms mean..

Assuming it means that hot-end travels a 1mm diagonal line in the xy plane with 40 steps from both x and y steppers?

Not quite. It means it moves 1mm along X and 1mm along Y, resulting in (appx) 1.41mm along the diagonal.

Frederick