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

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
>

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