## um/pulse Calculation (Newbie Guide)

General discussion of laser machines

### um/pulse Calculation (Newbie Guide)

Hi,

so I am trying to setup my LO DSP and there is Distance(um)/pulse setting. How can i calculate it?

I use 400 rev stepper , 1/16 microstep , MXL Belt , 20 tooth pulley (using metric system btw)

Thank you.
nephertiti

Posts: 27
Joined: Sun Oct 14, 2012 2:06 pm

### Re: um/pulse Calculation (Newbie Guide)

There is a calculator here,,,

http://www.buildlog.net/cnc_laser/belt_calcs.htm

You need to convert to um from inches though
Bart
"If you didn't build it, you will never own it."
bdring

Posts: 2966
Joined: Sun Nov 22, 2009 7:33 pm
Location: Chicago, IL, USA

### Re: um/pulse Calculation (Newbie Guide)

bdring wrote:There is a calculator here,,,

http://www.buildlog.net/cnc_laser/belt_calcs.htm

You need to convert to um from inches though

hmm Bart but your calculator is steps/inch , I need um/pulse
nephertiti

Posts: 27
Joined: Sun Oct 14, 2012 2:06 pm

### Re: um/pulse Calculation (Newbie Guide)

That is a basic conversion to metric and step and pulse are the same thing.

If resolution = 1000 step/inch the inverse (1/x) = 0.001 inches/step.

1 inch = 25400um (https://www.google.com/search?q=1+inch+ ... tnG=Search)

0.001 * 25400 = 25.4 um/pulse

...and look at the next line on the calculator page

http://www.buildlog.net/cnc_laser/belt_calcs.htm
Bart
"If you didn't build it, you will never own it."
bdring