Re: CNC division

Hi Fred,

Thanks for the comments. Sounds like "no wrap" would be the best way to
describe it, at least for the more common ones? CNCpro and MaxNC -DLX?

Alan KM6VV

IMService wrote:

>
> > Date: Thu, 05 Apr 2001 15:52:20 -0700
> > From: Alan Marconett KM6VV <KM6VV@...>
> >Subject: Re: CNC division
> >
> >
> >I'm not fully decided, but I THINK I'd rather not have the table "wrap
> >around", I.E., I'll go from 300 deg to 400 deg, when I want to get
> >around to 40 deg again. If I "wrap" a long rotary move to my 'Y' axis,
> >it works this way. If I want to cut 3 threads, I would just go 360*3
> >degrees.
> >
>
> The rotary axis is programmed in degrees and decimal degrees.
> The same rules apply to this axis as to a linear axis. You must
> use a system that 1) will respond to the increments that you need,
> and 2) it must be accurate to more than that increment, and
> 3) It must repeat, or somehow compensate for backlash.
>
> Just like a linear axis, the rotary axis can be programmed in
> absolute or incremental. The direction of rotation is programmed
> by the sign of the degrees. + movement is CCW and - is CW, looking
> down from the + center line to the minus centerline. Some controllers
> will not wind past 360, and must be reset at each full revolution.
> Incremental will often fool this problem. Also some rotary axes, like
> some of the Haas ones, must be unwound after doing up to about
> 6-10 revolutions.
>
> Place head in spindle position, looking down at table, C axis
> is + for CW and - for CCW, same for X axis & A degrees, and
> Y axis and B degrees.
>
> This is the standard, but some controllers use the W word(Ahha, EMC, Allen Bradley) in place
> of the A,B, or C. You just have to know which you are using.
>
> Best Regards, Fred Smith- IMService
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