Re: [CAD_CAM_EDM_DRO] tool comp

Hi Hoyt,

Just go to Yahoo groups, and search for "TurboCNC".

http://groups.yahoo.com/group/turbocnc/

Should also take you there.

Your kernel approach sounds interesting. Your canned cycles sound like
they would give you a "conversational" approach to milling. I'd like to
hear more.

Alan KM6VV

batwings@... wrote:

>
> At 10:35 AM 4/2/02 -0800, you wrote:
> >Try EMC's source code. I think it might have it. Yes, I'd like to
> >study some examples of tool comp, later...
>
> I looked in past and never figured it out. I'll try again. If anyone has an
> idea of what module it's in I'd appreciate a shout. I can tell a priori, it
> will require look-ahead. I suppose one would read in several lines of code
> into an array on X Y Z I J K, check by presence of the IJK whether an arc
> is involved or a linear move, check what quad is involved by slope etc,
> figure up offsets on toolpath in XY or add/subtract radius for arcs,
> compute new ending points for move, send command according to new coords
> ... go to next line. There's always an economical way of laying this out so
> you don't crunch more than you need.
>
> >What are "polar canned" routines"?
>
> Things like bolt circle and spiral drilling patterns, polygon, helix of
> course, lately I've used polar routine to do spiral pattern outfeed for
> circ-pocket also.
>
> >Rectangular to polar transforms?
> >Liner and/or circular interpolation?
>
> It iterates its way around the circle, doing the right things at each
> point. For bolt circle it drills at each station, for spiral it adds a
> radial increment before computing each station and drilling, for helix it
> generates arcs and down-steps, for polygon it feeds to depth and then feeds
> between stations, etc. All of that requires sin/cos or rect-to-polar
> transforms. I use same kernel to compute for all of above, just flag in/out
> of different parts of the prelim data handling and same on output, to make
> the right thing happen.
>
> >Check out TurboCNC list.
>
> You have subscription info?
>
> Regards, Hoyt
>