Re: [CAD_CAM_EDM_DRO] Re: Vinyl Cutting Algorithms

I would think that the direction of the blade is parallel to the first
derivative of the curve

fortino

----- Original Message -----
From: "alex likhterman" <telecom@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, July 17, 2003 10:18 PM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Vinyl Cutting Algorithms


> Rab,
> may be to put a stepper on the blade to steer it?
> Alex
> ----- Original Message -----
> From: rainnea <rainnea@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Thursday, July 17, 2003 5:12 AM
> Subject: [CAD_CAM_EDM_DRO] Re: Vinyl Cutting Algorithms
>
>
> > Hi,
> >
> > I've taken account of the blade offset and have written in an
> > algorithm that corrects for this.
> > Looks like I'd need to write in an additional algorithm to account
> > for the occasional times when the blade reverses direction between
> > cuts. It would probably just need a short squiggle cut on an unused
> > piece of the vinyl to turn the blade.
> > This problem only occurs when the blade is set slightly deeper than
> > normal, a light shallow cut seems to allow the blade to turn more
> > easily in these instance.
> >
> > Blades and holders from http://www.blades.uk.com
> > good service and the owner really knows his stuff.
> >
> > Rab
> >
> > http://www.rainnea.com/cnc.htm
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "fortino" <fortino_tan@h...>
> > wrote:
> > > Rab,
> > > Typically, the blade is not centered. It is offset about 0.1-0.2 mm
> > from the
> > > center.
> > > This offset would allow the knife to swivel/ turn every time it
> > changes
> > > direction.
> > > Beside, how about your knife? do you buy it or make it by yourself?
> > >
> > > I have two vinyl cutting machine that was driven by Gecko. The
> > mechanical
> > > part
> > > was build using chinese brand vinyl cutting machine. It uses
> > stepper motor.
> > >
> > > fortino
> > >
> > >
> > > ----- Original Message -----
> > > From: "rainnea" <rainnea@b...>
> > > To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> > > Sent: Thursday, July 17, 2003 7:30 AM
> > > Subject: [CAD_CAM_EDM_DRO] Vinyl Cutting Algorithms
> > >
> > >
> > > > I've added drag-knife vinyl cutting capability to my CNC Toolkit,
> > > > however it encounters a problem when the blade direction makes a
> > > > complete about turn of, or near to 180 degrees as often the drag
> > > > blade wont turn by itself and ends up going backwards for a while,
> > > > ruining the cut.
> > > > I'm considering various approaches to add an extra movement to
> > help
> > > > the blade turn into the cut, just wondering if this is something
> > > > anyone else has come across before ?
> > > >
> > > > thanks,
> > > >
> > > > Rab
> > > > http://groups.yahoo.com/group/CNC_Toolkit/
> > > >
> > > >
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> OFF Topic POSTS: General Machining
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aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
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> http://groups.yahoo.com/group/jobshophomeshop I consider this to be 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.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
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