A axis help

[Grumpy]

I need help with the “A’ axis, I have added a Stepper motor to the A axis to turn a glass cutter.
The Tangentail is active, I  have a test circle that I used SheetCam to generate the g code. The problem is the
A axis stepper just spins until it gets to a set point then it starts to cut. I thing the a axis should go directly to
the set point not spin until the DRO stops at a set point. I am also not sure how to calibrate the a axis, and if there is a special post processor I should be using. Below is the g-code if this will help 

What I am trying to do is cut stain glass. Have had success cutting straight  lines using the jog control

Looking forward to any help you can give

ed




N0000 (Filename: test Curve.txt)
N0010 (Post processor: Mach2.post)
N0020 (Date: 7/10/2011)
N0030 G20 (Units: Inches)
N0040 G40 G90
N0050 F1
N0060 (Part: test Curve)
N0070 (Process: No offset LINE, Mill/Router, 0.0004 inch diameter, 0 inch Deep)
N0080 (Mill/Router, 0.0004 inch diameter)
N0090 T55 M06  G43 H55
N0100 M08 (Flood coolant on)
N0110 M03 S100
N0120 G00 Z0.1000
N0130 X0.5000 Y2.5000
N0140 Z0.0197
N0150 G01 Z0.0000 F25
N0160 Y3.0000
N0170 G00 Z0.1000
N0180 X1.0000
N0190 Z0.0197
N0200 G01 Z0.0000
N0210 X1.7500 Y0.0000
N0220 G00 Z0.1000
N0230 X0.5000 Y0.5000
N0240 Z0.0197
N0250 G01 Z0.0000
N0260 Y0.0000
N0270 G00 Z0.1000
N0280 (Process: No offset CURVE, Mill/Router, 0.0004 inch diameter, 0 inch Deep)
N0290 Y2.5000
N0300 Z0.0197
N0310 G01 Z0.0000
N0320 G03 X0.5000 Y0.5000 I0.7500 J-1.0000
N0330 G00 Z0.1000
N0340 M09 (Coolant off)
N0350 M05
N0360 M05 M30

[Hood]

You will likely need to have the A set as a rotational axis and then your steps per unit will be steps per degree. For example, stepper with a 10uS drive and straight coupling would be (200 x 10)/360= 5.555555555 steps per unit.
Also you will likely be best to have Rotational Rollover selected on general Config page and possibly Ang Short on G0 rotation also selected.
Hood

[Grumpy]

Thank you for your reply- I hate to sound slow put I can't find where to set the A axis to rotational

[Hood]

Just looked and its actually called Angular in General Config page but just in case I have attached an image with the relevant parts circled. I have never used tangential control but you will likely want the rotational softlimits disabled , the Rotational rollover enabled and not sure on Ang short rotation.

Hood

[Grumpy]

Thanks Hood for your help, that corrected the problem but only after I installed the latest software

thanks again

Grumpy