Can you send me a pic of the knob you are looking for?
I may have it.
Email to
rorymcd@...Thanks
Rory McDonald
OldSynths Moderator
--- In oldsynths@yahoogroups.com, "Marvin Kaye" <marv@l...> wrote:
>
> HI again, Richard,
>
> I've been kicking around the idea of molding up some other (non-
> musical) parts for awhile, and this little episode has finally pushed
> me over the edge. I went ahead and ordered some molding silicone,
> release agent, and black urethane casting resin. I imagine I'll have
> all the "fixins" by next weekend. Naturally I had to order enough to
> make 200 slider knobs, but if I have good luck with my parts I'll be
> glad to make you a copy of yours... although all that shipping back
> and forth across the pond could make this a very long process. I've
> been working with composites for a number of years, although this
> will be my first venture into do-it-yourself injection molding, so
> I'm looking forward to the new challenge. My slider knob has a 1mm
> thick white (pointer) line that runs horizontally around its
> circumference that adds a bit more challenge to the project... I'm
> thinking I'll make an initial cast part into which I can mill the 1mm
> slot around its middle (it's nice to have a machine shop at hand) and
> use that to create a new exterior mold, then use an actual knob to
> mold the rear, with the notch for the slider shaft. One advantage to
> this approach is that the parting line will be at the exact back of
> the knob, so any flash will be removed invisibly. Once the black
> part is released from the mold I can apply some white casting resin
> to the slot, sand away the excess and polish off the whole thing once
> it's all cured up. A ton of work to duplicate a 50 cent part, but at
> least it will be right. I just hope the casting resin's black
> matches the black of the original knob. We'll see.
>
> <marv>
>
>
> --- In oldsynths@yahoogroups.com, "RMC" <rmc@r...> wrote:
>
> > if I do get anywhere with making a mould, I will let you know.
> Thanks for
> > getting in touch - at least we both know we aren't alone in our
> feeble
> > quest!
> >
> > Cheers
> >
> > Richard Craven
> > England