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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