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1

General Mach Discussion / Scale is off..

« on: February 20, 2010, 08:32:42 PM »

I've done a search and read about a zillion replies, and still don't see any suggestions for anything I haven't already  done. I'm stumped. When I run the roadrunner g-code, the tool path on the display moves much faster than the actual x/y/z's are moving. The  DRO scale is 1.
Steps Per Math is...
 200 steps per rev on the motors
 1/4 - 20 lead screws,
 1/8 micro stepping,
 "Steps per" is 32000  Right??

I have verified the board (Rockcliff) is set to 1/8 microstepping from the factory, and I have double checked the jumpers myself. No jumpers on = 1/8 microstepping.  I'm also thinking if the board was not microstepping, and I had Mach configured at 32000, it would have the opposite effect correct? Motors are tuned down to 20 inches /min velocity as the default setting of 40 was too fast for them. 

The difference in the scale is substancial, in fact it may be 1 to 8
I swear I don't have steps per at 320,000.
What else could it be ??
Going nuts in Texas...

2

General Mach Discussion / Double Checking my Math

« on: February 14, 2010, 08:20:28 PM »

I have Mach3 set up in inches.

My steppers are 200 steps per 1 rpm

My microstepping is at 8, so I have 8 * 200 = 1600 actual steps per rpm

I have 1/4 - 20 lead screws, so I have 20/rpms per inch

so 20rpm/inch * 1600 steps/rpm = 32,000 steps per inch

This gives me 32000 "steps per" in the motor config setting correct ?