[sdiy] Tonewheel relics

[Rutger Vlek]

The gears were made in a molding process, with POM. But they deformed
slightly, and the mold was't accurate enough. Normally gears are made with
specific tooling, much like wood turning process. However, once you go
outside standard 'module' dimensions it no longer works. I've been told
that 3d printed surfaces are too rough for obtaining durable gears... And
then the price.

Rutger

Op 22 okt. 2017 16:02 schreef "Ingo Debus" <igg.debus at gmail.com>:

>
> > Am 22.10.2017 um 15:18 schrieb Rutger Vlek <rutgervlek at gmail.com>:
> >
> > I have a decision to make on what to do with a 1970's tone wheel organ.
> I bought it cheap a few years ago. It's a Pari Attack, Italian Hammond
> clone.
>
> Ah, a Pari! Definitely a rarity. Myself I own a Parie (with e), which is
> an even stranger beast.
>
> How were the replacement gears made? Milled or 3D-printed? If 3D-printed,
> which method? Laser-sintered parts can be very accurate and sturdy. See my
> 3D-printed Hammond switch replacement:
> https://photos.app.goo.gl/piZQe7cst7gFj12G3
> But if you need many parts, this will get expensive.
>
> What’s the revolution speed of the tone wheels? Maybe you can use twelve
> stepper motors?
>
> One question out of curiosity: how is the vibrato scanner driven? Also via
> gears? In my Parie, both the tone wheels and the scanner are belt driven.
> Unlike on a Hammond, it's very easy to change the speed of the scanner
> (just remove the belt and spin it by hand). A very slow scanner vibrato
> sounds awesome.
>
> Ingo
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