Re: [CAD_CAM_EDM_DRO] home brew rapid prototype machines

If it looked like an injection molded part it has been hand worked. When these things come off the machine they looked like a
plowed field. Each pass of the laser leaves a row that has rounded edges.
I have been looking at the process for over four years to make a part to use with the 3M mold making process. The finished part
comes out of the machine so rough that it can not be used with out smoothing up and once you do that you do not have the part
that as made.
It ia also my opinion that the part is only good for looking at and test fitting
Larry

Jon Elson wrote:

> From: Jon Elson <jmelson@...>
>
> Joe Vicars wrote:
>
> > From: Joe Vicars <jvicars@...>
> >
> > I have a little experience with the rapid prototyping machines.
> > The
> > problem with these machines is that the parts they create aren't good
> > for anything but looks and fit testing. You would have to seriously
> > be
> > in to product development to justify the cost.
>
> I have to take issue with this. A friend of mine just had an RP part
> made for a project he
> is working on. It is essentially a kitchen cutting board, with an
> opening for the thing he
> is designing. (I'm being vague here to not divulge too much.) A
> cutting board has to
> be pretty tough to withstand normal use, and his definitely is. I'm not
> sure which process
> was used for this, but I believe it was the liquid polymer & laser
> system. I thought that
> this was an injection molded part when I first saw it, it was so solid.
>
> Jon
>
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