Pot "cover"

[Pete]

I have an existing piece of equipment that has a potentiometer on the
side that controls the speed of the machine. I would like to be able to
set the speed, then put some kind of cover over the pot to stop anyone
from idly twiddling it. I imagine this will take the form of some kind
of dome nut.

Does anyone know of anything like what I've described, and where I might
be able to get it?

I am not able to remove the pot in this equipment, or move it inside the
case.

Peter

 

[F Murtz]

Pete wrote:

I have an existing piece of equipment that has a potentiometer on the
side that controls the speed of the machine. I would like to be able to
set the speed, then put some kind of cover over the pot to stop anyone
from idly twiddling it. I imagine this will take the form of some kind
of dome nut.

Does anyone know of anything like what I've described, and where I might
be able to get it?

I am not able to remove the pot in this equipment, or move it inside the
case.

Peter
Just make a cover and fit it

 

[Ian Field]

"Pete" <pjetson@yahoo.com> wrote in message news:572306E9.10800@yahoo.com...

I have an existing piece of equipment that has a potentiometer on the side
that controls the speed of the machine. I would like to be able to set
the speed, then put some kind of cover over the pot to stop anyone from
idly twiddling it. I imagine this will take the form of some kind of dome
nut.

Does anyone know of anything like what I've described, and where I might
be able to get it?

I am not able to remove the pot in this equipment, or move it inside the
case.

Years ago they were not all that uncommon. But may be harder to find
nowadays.

The pot nut was either like a nylock nut or had an end like a drill chuck
collet that you tighten a locknut on. The nut usually had an external
threaded barrel that you screw a cap onto that looked pretty similar to an
old style panel indicator lamp lens.

The pot would have a short stubby spindle, usually with a screwdriver slot
in the end.

Various manufacturers made *that sort of thing* - but the only name I can
remember is Bulgin.

Nowadays; you're likely to have to try all the pot manufacturers.

 

[Phil Allison]

Pete wrote:

I have an existing piece of equipment that has a potentiometer on the
side that controls the speed of the machine. I would like to be able to
set the speed, then put some kind of cover over the pot to stop anyone
from idly twiddling it. I imagine this will take the form of some kind
of dome nut.

Does anyone know of anything like what I've described, and where I might
be able to get it?

** The device you want is called a "potentiometer shaft lock" - consisting of two parts, a nut with collet that replaces the pot mounting nut and a locking nut that clamps the shaft.

Obviously, the lock must suit the type of pot involved.

AFAIK, they are unobtanium nowadays, though I see *one* on Ebay that suits a 3/8 inch pot thread with 1/4 inch shaft.

I think your only option is to fabricate and fit a cover over the control.


..... Phil

 

[Grant]

On Fri, 29 Apr 2016 17:02:01 +1000, Pete <pjetson@yahoo.com> wrote:

I have an existing piece of equipment that has a potentiometer on the
side that controls the speed of the machine. I would like to be able to
set the speed, then put some kind of cover over the pot to stop anyone
from idly twiddling it. I imagine this will take the form of some kind
of dome nut.

Does anyone know of anything like what I've described, and where I might
be able to get it?

I am not able to remove the pot in this equipment, or move it inside the
case.

There's ten turn dial pot knobs with a lock, they're not cheap.

example: <http://au.rs-online.com/web/p/potentiometer-knobs/5042790/>

Grant.

Peter

 

[Jasen Betts]

On 2016-04-29, Pete <pjetson@yahoo.com> wrote:

I have an existing piece of equipment that has a potentiometer on the
side that controls the speed of the machine. I would like to be able to
set the speed, then put some kind of cover over the pot to stop anyone
from idly twiddling it. I imagine this will take the form of some kind
of dome nut.

Does anyone know of anything like what I've described, and where I might
be able to get it?

I am not able to remove the pot in this equipment, or move it inside the
case.

get a small metal or plastic jar with a screw on lid.

drill a 10mm hole in the lid

remove the knob and nut, fit the lid over the neck of the pot,
add a pop-rivet, or small screw to stop the lid from spinning,
replace the nut and knob, adjust, fit the jar.



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