Sizing seems to be a problem!!

[BOHICAMAN]

I have MACH3 (demo) version 3.042.029 installed with a HobbyCNC Pro board hooked to a Sherline 2000 CNC Mill. I also have LazyCam Pro V3.00.2. Here's the problem. I downloaded the LazyCam tutorial drawing (LCRO_HCIR.dxf) used in tutorial #1. After EXACTLY following the tutorial, I posted the G-code to MACH. It appears to run fine - except in minature! The entire machined piece is only about an inch long! This happened before with another drawing. I was meticulous in setting up MACH3 and LazyCam, but obviously I missed something . The are both set for "inches" . Anyone have any suggestions? Thanks!
Bob

[Hood]

If you command a move via MDI does it travel that distance. Example, if you zero the X axis then command G0X1 does the X travel one inch?
Hood

[BOHICAMAN]

Hood,
It moved 1/8th inch

[Hood]

Sounds like you need to set your steps per unit correctly.
What pitch ballscrews do you have?
Any gearing between motors and ballscrews?
What microstepping do your drives have?

Hood

[BOHICAMAN]

Hood,
Ballscrew 20 tpi, single start. No gearing between motors and ballscrew. Microstepping setup on board at 1/4inch, motors are #23-305-DS8A 425oz-in bipolar rating, 305oz-unipolar rating, 4.2v, 3A, 200 S/R, 3.2mH, Size #23, Dual Shaft, 8 wire. Hope that provides info you requested.

[Hood]

Ok so
your steppers are 200 steps per rev, Microstepping is 1/4 so you will need 200 x 4 = 800 steps to turn the motor one revolution.
You need 20 turns of the screw to move one inch so steps per unit in motor tuning will be 800 x 20 = 16,000.
Hood

[BOHICAMAN]

Thanks!! Will elt you know how I make out.

[BOHICAMAN]

Hood,
That seemed to fix it! Thanks for the help!!
Bob

[Hood]

No problem