Rotary axis setup

Topics related to wrapped rotary machining in Aspire or VCarve Pro

Rotary axis setup

Postby Hivoltage » Tue Dec 18, 2018 12:22 pm

I have an X-carve that I have modified with a 800w spindle (aircooled) and I use the G540 board for control. Mach3 for the software control
I bought my 4th axis off of ebay: ... :rk:1:pf:0
The features on that page are:
- Chuck type: 80mm self-centering 3 Claw Chuck
- Chuck center height?49MM
- Transmission ratio 1:6 (1200 pulses / revolution) synchronization gear reducer
- 3.5A 4 lead 57 stepper motor(1.8 Degree Step Angle)
- Stainless steel dust cover
- Processing load 30KG
- Anodized rust treatment
- 4-pin connector 1 = A +, 2 = A-, 3 = B +, 4 = B-
- Dimensions 170*200*90
- MACH3 setup instructions: 1 degree required Pulse
- The formula is: 360 / subdivision stepping angle * Drive * Transmission ratio / 360 = MACH3 Pulse

Everything on the X,Y,Z works with I am carving anything flat.
For some reason I cannot get the 4th axis to work properly.
I can get it to tune and it jogs. The issue is when I save the output from Vcarve the job rotates the part around multiple times.
When I look at the g-code it shows the A axis moving in the negative direction but more than 70mm as the work piece is 71mm circumference. (22.27mm diameter)
The g-code shows it going all the way up past -300.
What am I missing?
Posts: 10
Joined: Sun Sep 25, 2016 6:49 am
Model of CNC Machine: X-Carve 1000mm x 1000mm

Re: Rotary axis setup

Postby garylmast » Tue Dec 18, 2018 10:48 pm

You may have already done this, but it may need calibration. Under Settings, click set steps per unit. The rest of the steps are pretty simple.

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Re: Rotary axis setup

Postby Hivoltage » Wed Dec 19, 2018 10:06 am

I did do the calibration. The job from vcarvepro turns the linear movement into degree rotations. In the g-code I can see that it never goes above 360 and when it runs up to 300 on one like the actual rotation of the part rotates 3 times. I have followed tutorials and used a excel sheet that is supposed to help. Nothing works properly. :/
Posts: 10
Joined: Sun Sep 25, 2016 6:49 am
Model of CNC Machine: X-Carve 1000mm x 1000mm

Re: Rotary axis setup

Postby Greolt » Wed Dec 19, 2018 10:52 am

Zero the A axis DRO

Enter G0 A360 into the MDI

If it does something other than exactly one revolution then the calibration is not correct
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Location: Australia
Model of CNC Machine: 900 x 750 2hp UCCNC Router & others

Re: Rotary axis setup

Postby NormanAlbert » Thu Dec 20, 2018 7:32 pm

Have you gone in settings to set the radius?
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Re: Rotary axis setup

Postby ger21 » Thu Dec 20, 2018 9:09 pm

What do you have for steps/unit?

It should be 2000 x 6 / 360, which = 33.333steps/degree
Gerry -
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