bruno2000

Collet knobs
« on: February 24, 2011, 07:34:00 PM »
Does anyone have any experience with using 1/8" collet knobs (Sifam) on 1/8" D-shaped rotary switch shafts (Grayhill)?  Do they "grip" well enough?
Thanks!
Best,
Bruno2000


Ptownkid

Re: Collet knobs
« Reply #1 on: February 24, 2011, 08:00:13 PM »
I wondered this myself...and the answer i came to is that based on geometry they must...I think.

Sylvain D.

Re: Collet knobs
« Reply #2 on: February 24, 2011, 11:13:59 PM »
I have some old Fairchild 664 EQs and that is what is on those and they are quite solid. And these are pretty tough stepped switches (freq select & boots/ct).

Sylvain

solderspongebob

Re: Collet knobs
« Reply #3 on: February 25, 2011, 08:31:52 AM »
I've often wondered this with any pot shaft with a D-type profile. Some of the Sifams I've got fit fine, and others are just that little bit too loose.

Wish that there was a plastic/alu strip avaialble that you can cut to length and glue to the flat edge, that then makes the missing profile up so that the shaft is now round!
Current ratio of finger burns to solder joints: 1:10

haima

Re: Collet knobs
« Reply #4 on: February 26, 2011, 07:21:15 PM »
Wish that there was a plastic/alu strip avaialble that you can cut to length and glue to the flat edge, that then makes the missing profile up so that the shaft is now round!

Not a fun job, but a bit of time with a file and some aluminium stock would probably get you close...   :D

mac

Re: Collet knobs
« Reply #5 on: February 26, 2011, 11:37:36 PM »
pain in the butt! I just did this yesterday using a small sanding wheel in my dremel. So easy to go a bit too far when you are working on different pots (plastic, metal), and find the collet knob unable to grip (particularly for cheaper alpha rotary switches).

One that I am hoping to salvage by wrapping in plumbing thread tape before jamming the sifam collet knob on the top.

Mac
Barclaycon: The client said 'That sounds great, what are you using on it?'
The engineer's reply was: '30 years of experience'.

Igor

Re: Collet knobs
« Reply #6 on: February 28, 2011, 07:48:11 AM »
ELMA 10mm wing-knobs fitting pretty well on 1/8' shaft Grayhill switches.
We cutting the shafts for the length we need with Dremel tool,
the trick here is to work at maximum speed without applying any force, and use thin cutting weel.
Switch should be grip in a vice (?) this is how Google translates it from RU :)
Wear glasses and be careful.
After breaking some cutting wheels, you get the right touch, and cutting one shaft takes exactly 20 seconds.
I had no experience with Sifam 1/8' collet knobs, but ELMA's fits fine.
« Last Edit: February 28, 2011, 07:50:22 AM by Igor »
http://www.ij-audio.com
(new site hopefully will be up in July)

Sylvain D.

Re: Collet knobs
« Reply #7 on: February 28, 2011, 08:02:01 AM »
"vice" is correct...
Same word, has more than one significance. ;D

Sylvain

kambo

Re: Collet knobs
« Reply #8 on: February 28, 2011, 05:14:09 PM »
Switch should be grip in a vice (?) this is how Google translates it from RU :)

you mean shaft, not the switch itself
same as cutting sontec pots  ;)

 

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