Re: [CAD_CAM_EDM_DRO] Re: TANGENTIAL?

ballendo wrote:


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!

http://www.signcatalog.com/Blades_Holders.htm

With the drag knives and swivel holder, one can rely on 1/8" tall letters without much problem. You can go smaller but the actual font can then have a lot to do with the cutting quality. If I HAD to
do some small stuff, I would then let SignLab create the "overshoot" toolpath to fix things.

Chris L

>
> Hope this helps,
>
> Ballendo
>
> P.S. Dave, the errors are usually around the 0 degree position. (0
> (up) and 270 (down) don't present any problem. Boundary checks
> assumed.
>
> --- In CAD_CAM_EDM_DRO@y..., Dave Lantz <dlantz@a...> wrote:
> > I just ran thru the BASIC math of it... and i believe i concure..
> however
> > you'd have to have everything in incrimental... EXEPT the
> tangential axis..
> > if i understand it right???
> > because you'd need a X value and Y value of the next point to
> calculate the
> > angle, then do something like
> > the TAN of theta = Y/X... and do some multiplication to derive the
> steps of
> > a steper into degrees (or radiuns... ug...)
> > ???post processor???
> >
> > here is a thought.. what would happen if you go straight up or down
> > (incremental X value of 0) aren't you going to have an error? you'd
> need an
> > exception stating that if x=0 then theta is 90 if y >0, or 270 if
> y<0,
> > right?
> > ok... it also wouldn't know which direction to rotate to if Y=0
> also...
> >
> > -----Original Message-----
> > From: art [mailto:fenerty@h...]
> > Sent: Sunday, April 28, 2002 9:13 AM
> > To: CAD_CAM_EDM_DRO@y...
> > Subject: Re: [CAD_CAM_EDM_DRO] TANGENTIAL?
> >
> >
> > Thanks Doug: (your checks in the mail)
> >
> > Wouldn't it be just a simple matter of calculating the next
> trajectory
> > direction and rotating the engraver knife to the right direction
> prior to
> > the move...of course, all arc's would have to be converted to
> segments prior
> > to doing this...
> >
> > Or is there something I'm missing here? Is a tangental cutter
> just a
> > rotational axis?
> >
> > Art
> > Master5 Software
> > http://users.andara.com/~fenerty/master.htm
> >
> >
> >
> >
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> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this as a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list.
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