RE: [CAD_CAM_EDM_DRO] Re: TANGENTIAL?

hello all, im back again. I did find a swivel knife that is supposed to cut
under its own wieght..
its at:

http://www.aeronautauto.com/pages/consumables.html

down at the bottom, does anyone have experience with this knife? it claims
to work in most pen plotters...
it is listed as 105... let me know if anyone has tried it. im thinking of
picking up an old flatbed plotter and putting it in it!---Dave L.

-----Original Message-----
From: ballendo [mailto:ballendo@...]
Sent: Monday, April 29, 2002 1:58 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: TANGENTIAL?


Hello,

Many controls "know" which direction they are "headed".

The arcTANgent gives this, even in "swept" arc algorithms... Add some
boundary checks and initialisation code and you can always know a
direction delta angle. This can then be used for tangential axis
moves and trajectory planning.

The EMC 274NGC interpreter contains a bit of code to deal with this.

FWIW, the free DanCAD3d download (www.metalworking.com) contains the
program DanPLOT, which supports the C axis required for tangential
cutting. I have to agree with Chris, that for all but small
letters/designs, the dragknife works nearly as well. But I don't know
where he gets them with holder for 100 bucks!

Hope this helps,

Ballendo