RE: [CAD_CAM_EDM_DRO] Re: I need help defining cutter compensation (Offset?) in Dolphin CAD/CAM

Doug

Yes, the post processor can be tailored to cope
with the various practices used in applying CRC. Also
the contour facility allows you to specify an
Approach/Runoff move, this move can be used to apply
or cancel CRC before the tool actually starts the
Contour. Approach/Runoff moves may be Tangential, Parallel
or Normal to the direction of cut of the contour.

regards
michael

-----Original Message-----
From: doug98105 [mailto:dougrasmussen@...]
Sent: 16 December 2001 18:20
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: I need help defining cutter compensation
(Offset?) in Dolphin CAD/CAM


John,

Dolphin looks pretty straight forward. Obviously, the second screen
shot you provided would be my favored way of doing the job (provided
the CNC controller will support it).

I looked over the generated code and noticed some things that may not
work with all controllers. It appears the end mill goes to depth,
then compensates (G41) while at depth with a feed rate of F12. Some
controllers compensate at rapid rate which would not be a good
situation if the cutter is already into the part. Likewise, the G40
while the cutter is still at depth. In my shop I have 4 different
controls, all have their own strange habits when it comes to CRC, so
we make it a rule to always try to engage CRC with the cutter at Z.1
above the part.

Is there a way to "teach" Dolphin about the CRC quirks of different
controllers?

thanks,

Doug





--- In CAD_CAM_EDM_DRO@y..., "stevenson_engineers" <machines@n...>
wrote:

> --- In CAD_CAM_EDM_DRO@y..., "doug98105" <dougrasmussen@c...> wrote:
> > Eric,
> >
> > In the long run you'll be much better off letting the CNC
> >controller
> > do the offsetting rather than doing it in CAM. Of course this

only

> > works if your controller supports CRC (cutter radius

compensation),

> >I
> > think Ahha does.
> >
> > To have your controller handle the CRC, requires the CAM software
> >to
> > insert the correct offset commands, G40,G41,G42, in the

appropriate

> > places in your Gcode file. I don't know anything about Dolphin

so

> >I
> > have no idea whether it will do this for you automatically, or
> > whether you have to manually edit the Gcode file and insert the
> > commands yourself.
> >
> Doug and list,
> Look at:-
> http://homepage.ntlworld.com/machines/offset.txt
> To see how Dolphin handles offsets automatically.
> You don't need to draw offsets in Dolphin, it will do it all for

you.

>
> John S.

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