Trying to figure out my steps per mm Using the Rep Rap Calculator

Here is the link to the NEMA 23 Steppers that i bought as a kit with the cnc controller.

http://www.ebay.ca/itm/3-Axis-3A-Stepper-Controller-Cnc-Kit-Nema23-24V-Psu-For-Milling-Machine-/401075212293?hash=item5d61f21005:g:Hq0AAOSwzJ5XZ8Oz

Here is the link to the leadscrew i have selected

http://www.banggood.com/T8-800mm-Stainless-Steel-Lead-Screw-Set-with-Shaft-coupling-and-Mounting-Support-p-1062920.html

From the above sites i was able to determine my:

Motor Step Angle 1.8
Leadscrew Pitch 2mm

I have the dip switches on my cnc board set to be at 1/8 micro step.

The part that i think im messing up is the pitch preset where i am only guessing that is m8 1.25 mm per rotation.

With the above information i get 800 steps per mm which seems absurd
PLEASE SOMEONE HELP ME if i roatate the rod 1 full revolution it travels 8.1mm

Am i just messing up the calculation???

Looks like the screw is labeled vaguely, and the lead is actually 8mm.
So with 1600 steps per rev, divided by 8, you should have 200 steps/mm.

Where did you get the 1600 im curious

I have entered the setting at 200steps per mm , if i get my calipers and move the z axis down 10 mm on mach3 display should that be 10mm of travel on the leadscrew ?

If the display (DRO) shows 10mm, then the Z axis should move 10mm.

Thanks for your quick replies i think im on to something . I have a video here to show you what i actually get when i move the z axis down 10 mm on the DRO



https://www.youtube.com/watch?v=r5UPgpz9q7o

Thanks again for your help it looks though as if im only seeing close to 5 mm when i move it 10 on DRO any ideas?

Then change it to 100 steps/mm

it was actually the other way . it was 400 steps per mm. Thanks so much for your help!

Where did you get the 1600 im curious

Steppers are 200 steps/rev.
With 1/8 microstepping, it's 8x 200.

Im Back !!! i am trying to add a rotary axis,,, i cannot get the axis to move as the A , only the X and is there some sort of settings to change this to be a rotary axis in mach 3?  here is a video to help explain.

https://www.youtube.com/watch?v=o54M_phYJpY

Thanks!