[sdiy] Inexpensive Rolandesque spline knobs from Thailand

[Stewart Pye]

Robin,

I just realised you were talking about slop in the 9mm Alpha's, so maybe 
the 16mm Alphas are OK...

Regards,
Stewart.


On 8/8/2012 7:03 AM, Stewart Pye wrote:
> Hi Robin,
>
> Have you tried the 16mm BI Tech ones? I have some here but haven't 
> used them yet. Hopefully they don't suffer from the slop that you 
> mentioned.
>
> http://au.mouser.com/Search/Refine.aspx?Keyword=P160KN-0QC
>
> Regards,
> Stewart.
>
> On 8/7/2012 7:55 PM, Robin Whittle wrote:
>> Hi Tom,
>>
>> I am interested in the black ones, but the grey ones would no doubt be
>> of interest to other folks:
>>
>>> I think Robin is referring to these ones:
>>> http://www.ebay.com/itm/10-x-Knob-Grey-Blue-Mark-Potentiometer-Pot-HJ106-THAISHOPETC-/140799464473 
>>>
>> or http://www.ebay.com/itm/140799464473
>>
>>> (several colours available)
>>>
>>> Personally, quite excited to see these -> compact spline shaft knobs
>>> give me good ideas (drum voices etc - more compact than my regular
>>> panels but without the hassle of set-screw knobs like the davies ones)
>>>
>>> So - thanks for the pointer Robin!
>> There are some smallish Sifam spline knobs at:
>>
>> http://www.rapidonline.com/Tools-Equipment/Fasteners-Fixings/Knob-Fixings
>>
>> such as the 11mm soft touch Sifam 3/03/TPN110 006 range:
>>
>>
>> http://www.rapidonline.com/Tools-Equipment/Sifam-11mm-Soft-Touch-Mixer-Style-Control-Knobs-502503 
>>
>>
>> I have some here like this, without the nut cover.  I got them from RS
>> Components:
>>
>> http://australia.rs-online.com/web/p/potentiometer-knobs/2994884/
>>
>> These are the shape of the front four in the illustration.  They look
>> and feel OK, but I found them very difficult to get onto the spline
>> shaft of some Tiawan Alpha pots I got from Jaycar here in Australia,
>> such as:
>>
>> http://www.jaycar.com.au/productView.asp?ID=RP8504&form=CAT2&SUBCATID=968
>>
>> I found it even more difficult to get the knob off the shaft. Some
>> leverage was required, which distorted the knob and perhaps lead to
>> damage of the splines.  There's no such trouble with the Thai/Chinese
>> pots - they go on and off well.
>>
>> The Sifam knobs are still unreasonably tight on the BI Technology pots,
>> despite them having a longer shaft with a much longer split.
>>
>> So I think the tightness is due to the knobs themselves, not any
>> particular pots I am trying them on.
>>
>> BTW, I think these small Tiawan Alpha pots are not good for anything
>> involving precision control, such as pitch.  They have some internal
>> slop between the shaft and the rotor.  There are some similar pots from
>> BI Technologies at Mouser, but not with the range of values which Jaycar
>> carry:
>>
>>    http://au.mouser.com/Search/Refine.aspx?Keyword=P092N
>>
>> The BI pots have no such slop.
>>
>> The Thai/Chinese knobs are a rather loose fit on the BI Technology pots,
>> but that should be easy to fix with some kind of glue-like material.
>>
>>
>>    Cheers
>>
>>     - Robin
>>
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