[sdiy] Two parameter mechanical controller thoughts....

Pete Hartman pete.hartman at gmail.com
Fri Jun 7 21:23:47 CEST 2019

On Fri, Jun 7, 2019 at 1:51 PM Kylee Kennedy <kmkennedy at gmail.com> wrote:

> I would go with a long optical sensor ribbon...It would see the placement
> left to right and up and down of the silver puck. Then your rails can be
> stupid sturdy.
> So many ways to skin this cat. Are you shrinking this down to Euro? My
> favorite part of this is how large the screen is, the tiny keyboard looks
> silly in the corner there.

JUST the control, but yes, shrinking down for Euro.  There are other
granular modules out there that if I had the control, I could manage
everything else with "off the shelf" modules.

> Wasn't there a granular tabletop synth similar in granular playback
> features to this but not the cool sliders on kickstarter last year or so?

Hm.  I hadn't seen that.

Shaft bearings are a lot cheaper than the linear rail bearings, I'm
investigating how practical that might be.  Don't want a lot of roll which
seems to be the main risk of round shafts, but  it may be that a slot would
be good enough tolerance to hold it upright.  Then it's down to how long a
shaft can I work with.  Seems the shorter end of things are 100mm (which
would be under, maybe significantly under, 100mm throw) or 200mm.  I'm not
seeing, e.g. 120mm which would give me close to 100mm throw while still
allowing for mounting.

As far as the reading of the travelling encoder, the spring idea is
probably over complicated too.  tie-wrap strain relief at each end should
be sufficient to prevent a 3 or 4 wire twist/braid from breaking off at the
solder joints.
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