Author Topic: Bottom Capstan Screw  (Read 134 times)

Offline seanny_keys

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Bottom Capstan Screw
« on: May 07, 2019, 08:09:22 AM »
Hello my fellow electric keys enthusiasts,

I am trying to understand the proper setting for the bottom capstan screws on the 200a. Based on the manual it seems like the the bottom capstan screw should be set so each key has 1/32" of wiggle at the tip of the key when resting (Lost Motion Traveling Depth).

Am I understanding this correctly?

Does anyone have a good technique for setting this? E.g. measuring each key's traveling depth with a ruler vs. adjusting to the right feel.


Offline pianotuner steveo

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Re: Bottom Capstan Screw
« Reply #1 on: May 07, 2019, 09:36:13 AM »
It does not have to be perfect as long as it is close, and there is a little lost motion. If it's too high, the hammer/whip assembly will start to rise up. If that happens, back the capstan down again until there is a tiny gap between the tip of the jack and the whip felt. If it's too tight, the jack won't always return to it's starting position again.

This normally doesn't need much adjustment unless someone has messed with it. The other capstan (letoff adjustment) is far more critical.
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Offline seanny_keys

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Re: Bottom Capstan Screw
« Reply #2 on: May 07, 2019, 10:39:24 AM »
Okay great makes perfect sense to me, thanks!

I think I may have one or two keys towards the bottom end that are too tight and not falling back into position.

Offline funkylaundry

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Re: Bottom Capstan Screw
« Reply #3 on: May 22, 2019, 05:17:40 AM »
What I usually do is I hold the hammer in place with a finger so it doesn't move and then I lightly press the key with my other hand and see how much the key moves before it's obstructed by the hammer. I don't actually measure it - I just make sure that each key has a "little bit of wiggle" before the hammer moves anywhere.
'72 Fender Rhodes MkI Stage, '73 Wurlitzer 200, '72 Clavinet D6, '75 Hammond B-3, '71 Leslie 147, Hammond X5, Leslie 710, Nord Stage 2 73SW, Moog Sub 37, DSI Mopho X4, DSI Tetra