Re: [CAD_CAM_EDM_DRO] Best way to enlarge a DXF drawing for cutting tool paths?

Hi Mark,

My pleasure! We'll look forward to seeing your work!

Alan KM6VV


Mark Roberts wrote:

>
> Thanks Everyone:
>
> Alan, I found the CNC for Hobbyist file and downloaded it. Thanks for
> the tip. The learning curve is a bit awkward right now, and as soon as I
> can identify the coordinates, I'll forward them on. It should make a
> nice wall plaque :o)
>
> Mark
>
> -----Original Message-----
> From: Alan Marconett KM6VV [mailto:KM6VV@...]
> Sent: Sunday, April 13, 2003 3:18 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] Best way to enlarge a DXF drawing for
> cutting tool paths?
>
> Hi Mark,
>
> What you want to do is use offsets, not scaling. If you have a line,
> offset another line by 1/2 the tool dia. to the outside of the part
> outline. If there is a curved surface, then increase the radius of the
> arc by 1/2 the tool dia. Got a square corner? Swing an arc around it.
> You guessed it, 1/2 the tool dia.
>
> You might want to check out the white paper "CNC for Hobbyists" I posted
> in the files section.
>
> HTH
>
> Alan KM6VV
>
> Mark Roberts wrote:
> >
> > Hi All:
> > Regarding cutting wooden parts on a HobbyCNC 3 axis mill:
> >
> > What is the best way to enlarge a part on a DXF file to compensate for
>
> > the tool width? I have parts for an airplane I wish to cut. In
> > ModelCAD (or any other drawing program) if I select the part and use
> > the "scale" option, and I scale the selected part by 1/2 the bit size
> > (i.e.: I scale the part up 0.015625 -- 1/2 of the 1/32 inch cutting
> > tool--), I get an uneven result. The length and width scaled do not
> > even come close to the 0.015625 outline I am trying to achieve. All I
> > want to do is get a 0.015625 outline of the part I am wanting to cut,
> > and put that outline on a different layer so as to use that layer for
> > the tool path.
> >
> > Any suggestions? What do you all do to compensate for the tool size?
> >
> > Thanks for helping a newbie!
> >
> > Mark