Re: [CAD_CAM_EDM_DRO] Rhino + Guitar curves

John,

Why don't you contact me off group, since I think the group moms will bounce
this topic fairly quickly for being a bit OT, which it probably is. I am a 5
or 6 year user (I discover Rhino, in its earliest beta, while teaching
Alias, its rich cousin, at a design school in Detroit) and would be glad to
help you as best I can. I will at least point you to a group that can help.

Mike Rainone
mrain1@...

----- Original Message -----
From: <johnhe-uk@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, March 18, 2003 5:07 AM
Subject: [CAD_CAM_EDM_DRO] Rhino + Guitar curves


>
> Hi,
>
> I just downloaded Rhino again to try and build a guitar body in it. I am
> almost toally new to it in comparison to most of you guys. I started by
> drawing a set of curves on the front veiw to create a contour, then joined
> them and extruded out the shape to the correct length of the body. That's
all
> fine. Then cut out the pockets for the pickups, bridge, neck etc. Easy.
>
> From there I needed to profile the edges of my contoured block (Top and
> bottom contoured only so far). I guess I kind of cheated here rather than
> finding out how to do it properly and used the fillet tool with a massive
> radius set to create the first simple curves at the back end of the body.
I
> now have a top and bottom contoured block with a rounded end (The end
furthest
> from the neck).
>
> And now I'm stuck! :P I was working through the tutorials, my duck
was
> going great till it came to trimming the extruded neck into the body. Dumb
> duck! Click inside the body inside the extuded area? I think not! Being
new to
> it I kept pressing F10 with my guitar body to try and get control surfaces
up
> to profile the kind of figure of 8 shape most guitar bodies are, but alas
'Can
> not use control points on polysurfaces'. I also kept trying things like
using
> trim to cut the body profile but the cutting tool, my curvy line, doesn't
seem
> to want to do much cutting (Would I create the curve in top down view
then,
> anywhere vertically above the body, then use it to cut through?). Could I
use
> the curved line as a cut plane? Another idea was to create a curve,
extrude it
> down, extude it back, then use the difference tool to cut the shape into
the
> bodie's side. But there must be an easier way than that judging by how
much
> easier other things are in this! So, any help with this would be majorly
> appreciated.
>
> My second problem was... If the body is contoured on both sides how could
it
> be machined in the real world on a knee mill? It could contour one side,
then
> you'd need to flip the block over and have it contour the other. But as it
> worked it'd be slowly cutting the sides through to the other (To make an
> almost fully rounded edge along the sides of the guitar) and I am
imagining
> the work piece could drop out of the block as it came close to finishing
the
> edges due to the tool pushing down on it, or atleast it'd deflect
somewhere.
> My answer to this was to leave something like 1cm uncurved on the edges to
> hold the work in place (In the block it's being cut from), then cut the
work
> out with a saw. I was thinking of making this from something cheap like
MDF so
> the tool pressure wouldn't be massive on the contouring. I wanted to
create an
> MDF version then have it cast from magnesium for one seriously mad guitar.
A
> billet of the right size is a mere 800 Pounds stirling!!! So machining it
out
> from a billet is _not_ an option. Cast it's more than halved in price.
Does
> Rhino have a scale option where percentages can be used rather than using
the
> mouse to scale it? This would be to allow for the 1.3% shrinkage from
pattern
> to cast. Can any of you guys think of a way that the work could be held
once
> it's cast and contoured? Having it cast bring up the concern of the neck
> binding or something else being just slight too small to fit the neck so
it'd
> probably need machining after.
>
> Of coarse, just buying a guitar is not good enough, you're on this list,
you
> know how it is! :)
>
> Sorry it's so long! Can you tell I'm stuck?
>
> Thanks for any help,
> John
>
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