Re: CNC division

Ian,

Not quite the answer to your question, but....

From memory, (not near the manual) I think my Haas programmable 4th
axis does the math for you. In other words if you have a simple
exact 90 degree type index, then program in degrees. In cases where
you might be doing something like a 97 tooth gear machining job
there's likely to be exact dividing/resolution problems, then you
have the option of specifying a 97 divison movement and the control
does the calculations and rounding as needed.

I suspect integrated 4th axis controllers would have similiar options.

Doug

--- In CAD_CAM_EDM_DRO@y..., "Ian Wright" <Ian@i...> wrote:
> Hi,
>
> I've been thinking about running a dividing head / rotary table
under cnc
> control and was wondering how the division is usually arranged. As
most
> divisions will not be whole numbers of steps on a stepper or
encoder, you
> obviously can't just tell the thing to round up or down the error
as you
> will likely finish up with a 364 1/2 tooth wheel instead of a 365
one (for a
> year calendar on a clock). So, with a slight bias towards EMC, can
you have
> the cnc software do the necessary computation to get closest
divisions or
> would you have to do it with a hand-calculated canned cycle for
each number
> of divisions - or perhaps some other way?
>
> Ian
> --
> Ian W. Wright
> Sheffield UK
> www.iw63.freeserve.co.uk