tool comp

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

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