Topics

1

General Mach Discussion / Kiran - Circle Wizard - cuts eliptical

« on: April 01, 2009, 11:29:03 AM »

200 step / rev
1/2 step mode
4000 steps per inch
Motors are tuned.

Strangeness indeed when I choose a tool smaller then 1/4 inch to cut a circle it cuts eliptical ... i have tried the code in cncsimulator and it performs a circle.  Here is the code ... any one have thoughts ?  It also cutting larger then what is in the wizard ... 1 inch diameter is like a 1 inch radius instead almost twice the size. 

1/4 inch tool

F400
G00 Z0.5
G00 X0.875 Y0.5
G00 Z0
G01 Z-0.04 F8
G02 X0.875 Y0.5 I-0.375 J0 F400
G00 Z0.5
G00 X0.875 Y0.5
G01 Z-0.05 F400
G01 Z-0.05 F8
G03 X0.875 Y0.5 I-0.375 J0 F400
G00 Z0.5
G00 X0.5 Y0.5
M30

1/8 tool

F400
G00 Z0.5
G00 X1.1875 Y0.75
G00 Z0
G01 Z-0.04 F8
G02 X1.1875 Y0.75 I-0.4375 J0 F400
G00 Z0.5
G00 X1.1875 Y0.75
G01 Z-0.05 F400
G01 Z-0.05 F8
G03 X1.1875 Y0.75 I-0.4375 J0 F400
G00 Z0.5
G00 X0.75 Y0.75
M30

1/16 tool

F400
G00 Z0.5
G00 X0.96875 Y0.5
G00 Z0
G01 Z-0.04 F8
G02 X0.96875 Y0.5 I-0.4688 J0 F400
G00 Z0.5
G00 X0.96875 Y0.5
G01 Z-0.05 F400
G01 Z-0.05 F8
G03 X0.96875 Y0.5 I-0.4688 J0 F400
G00 Z0.5
G00 X0.5 Y0.5
M30


Thanks
Peter

2

General Mach Discussion / Motor tuning calculations

« on: March 29, 2009, 10:46:26 AM »

Hello to all this is the setup,

Units = Inches
Stepper motor - 200 step / rev
Driver - 1/2 step -
Lead Screw - 10 tpi

When I setup in motor tunning I am using this calculation ...

200 x 2 x 10 = 4000 steps per inch (motor does not run correct) ... but this does not work ... 2000 steps per inch does the job, but this does not make sense to me from what I have read.

I started with 400 steps per inch ... but this was not correct either, the motor does run smoothly ... only gives me about 1/4 of an inch.

Could someone help show me where I messed up the calcualtion.

Thank you.