Homing the 4th Rotary Axis "A"

[Paraprop]

My 4th Axis which is the A rotary, is now operational.

Given that the DeskCNC controller board allows for an "A" home input, I have provided it with an optical Omron switch to set Home on it. This will be very usefull to position my camshafts correctly.

However, now, I can't find out how to home it from the DeskCNC control screen. Any prompt advise would be appreciated.

Thanks,

Daniel.

[Paraprop]

I guess there is no button for Homing in DeskCNC screen.

However I managed to do it as a G code instruction in the MDI field
G30 A xx Fxx

Thanks

[Barry_ward]

Para

I looked at the post about cams and was disappointed that everyone was so negative. I beleive that you can make your own cam machiine and learn along the way. You have the "what it takes" and "get 'er done" attitude that is really what cnczone is all about, not naysayers....

"Nothing in the world can take the place of persistence"

best regards,
Barry

[Paraprop]

Barry,

thanks for your suportive posting.

AS of now I have not implemented the setup but I have made most of the components required.

My main difficulty is to convert digitized cam lobe data into Gcode.

To digitize, I am using Performancetrends.com's cam tester setup.

Daniel.

[Barry_ward]

What form is the data in?
It should be "relatively" easy to get it into a format where a small program could generate the g code.

Or am I missing something?

Also to get rid of the steps that "that negative guy" was complaining about you could likely use a program that supported beizer splines and smoothing.

You are just going to spin the A axis and run you grinder with the Z, correct?

To me the "impossible" part will be keeping the wheel accurate.
I'm guessing that you will have to do 1 or more roughing grinds, then the final machining.

(PS I'm not a grinder, just a do-er)
"From the confidence that comes from ignorance, I proceed"

best regards,

Barry

PS on the good side, as the wheel wears, your cam will err on the over size side, which it seems would be better that being undersized. ("but I'm not a grinder")