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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