Re: [CAD_CAM_EDM_DRO] Re: Direction follower ?

Hi,

Dancad /CAM has a facility for using a 'drag cutter' which was intended for
such things as cutting vinyl sheet. The same method could be used with your
glass cutter.
Alternatively you could just believe the old wives tale which was repeated
in a number of books in the 1920's to 40's which said you could cut glass
with scissors - provided you did it under water!!

Best wishes,
Ian
--

Ian W. Wright
Sheffield, UK

----- Original Message -----
From: "rainnea" <rainnea@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, July 18, 2002 9:54 PM
Subject: [CAD_CAM_EDM_DRO] Re: Direction follower ?


> I'm not sure how you'r going to mount your cutter, but assuming that
> its able to rotate and you're using a 4-axis controller then even a
> simple timing belt / pulley setup should be good enough to align your
> cutter in the right direction.
> Working out the angle of cut at it's simplest would be the direction
> vector to the next point on the toolpath which could probably even be
> done in Excel although I suspect that you might want to implement
> some look-ahead and smoothing and to detect acute angles for lifting
> the cutter if it comes to too sharp a corner.
> Does feedrate need to be controlled according to the curve that the
> cutter is following ?
>
> Good luck,
>
> Rab
>
> --- In CAD_CAM_EDM_DRO@y..., "turbulatordude" <davemucha@j...> wrote:
> > Hi Brian,
> >
> > Thanks,
> >
> > I too know that you cannot cut rectangles without lifting the
> cutter.
> >
> > But, my intention is to cut patterns. curves and such.
> > So, just as you could curve your cutter when you cut by hand, the
> > cutter should rotate to always be aligned to the direction of cut.
> >
> > Dave
> >
> >
> >
> >
> >
> > --- In CAD_CAM_EDM_DRO@y..., "Brian" <ka1bbg@w...> wrote:
> > > Hi, well my years of cutting glass tell me if you spin the wheel
> > with
> > > pressure on it you probably will break the glass or make a star
> > crack. to
> > > make square edges you must lift,orientate,start the new cut
> before
> > the old
> > > cut line to make a clean break reliably. good luck brian f.
> > > ----- Original Message -----
> > > From: "turbulatordude" <davemucha@j...>
> > > To: <CAD_CAM_EDM_DRO@y...>
> > > Sent: Wednesday, July 17, 2002 9:56 PM
> > > Subject: [CAD_CAM_EDM_DRO] Direction follower ?
> > >
> > >
> > > > Hi all,
> > > >
> > > > I am still toying with cutting glass and found that a weighted
> > > > standard glass cutter will cut glass easily enough.
> > > >
> > > > the problem is turning the cutter so it is always facing the
> > > > direction of cut. This is similar to knife cutting vynal, but
> it
> > > > appears to me that the action would have to be pretty accurate
> in
> > > > angling in the direction of cut so as to score the glass
> cleanly.
> > > >
> > > > Any ideas on how best to do this ?
> > > >
> > > > Dave
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > Addresses:
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> > > >
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> > > >
> > > > http://groups.yahoo.com/group/jobshophomeshop I consider this
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>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
you have trouble.
> 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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