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Knob: Shaft-length Problem
Knob: Shaft-length Problem
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Old 13th November 2007, 02:43 AM   #11
Magura is offline Magura  Denmark
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Quote:
Originally posted by mpmarino


As ugly as they are(), they would probably do the job.

Tom, if your not in a hurry, maybe I can help.

Quote:
Originally posted by gootee


I guess "should" was the operative word, there. :-) I can't see the solution.

It's causing me pain.
So would you please explain,
to my sleep-deprived brain,
a little more-fully, what's germane?

- Tom
I think the two of you should have a little chat, that just might solve your problem.

Tom,

If you take a closer look at the buttons in the pic, you will see that the set screw has been moved all the way back and there is no recess in the back of the button.
This allows you to mount it on a shaft down to approx. 3mm lenght.

Magura
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Old 13th November 2007, 02:43 AM   #12
mpmarino is offline mpmarino  United States
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The grub screw is as far back as physically possible.


he he... what he said.,
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Old 13th November 2007, 02:46 AM   #13
Magura is offline Magura  Denmark
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In this pic it's easy to see what the point is.

http://www.briangt.com/gallery/album64/PICT0148


Magura
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Old 13th November 2007, 02:59 AM   #14
mpmarino is offline mpmarino  United States
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....or actually, you could put a regular alu knob in a vice and take the rear of it down with a belt sander or something, thereby 'moving' the screw to the rear.
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Old 13th November 2007, 03:10 AM   #15
gootee is offline gootee  United States
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Quote:
Originally posted by mpmarino


As ugly as they are(), they would probably do the job.

Tom, if your not in a hurry, maybe I can help.
Unfortunately, I am in a bit of a hurry, for this particular one, since the unit is actually supposed to go to someone else, within a few days or less.

I miscalculated the available shaft length by not including the height of the "standoffs" at the bottoms of the switch's PCB pins. Otherwise, the setscrew would be completely over the flat part of the D-shaped shaft, instead of halfway off of it. Admittedly, having it just barely all the way on the shaft might not have been ideal. But it would have worked OK, I think.

My best hope, in this case, might still be finding a push-on knob that's made for D-shaped shafts, that would work. My next-best plan is probably to try to make a shaft extension, myself, and use one of the setscrew-type knobs that I already have on hand.

Oh, wait. I see Magura's post, now. A 3mm shaft-length minimum, you say? That would work!!

I may make a few more of these units, in the future. So I will probably want to find a source for knobs that will work well, that require less effort on my part than lengthening the shaft. :-)
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Old 13th November 2007, 03:26 AM   #16
gootee is offline gootee  United States
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Quote:
Originally posted by mpmarino
....or actually, you could put a regular alu knob in a vice and take the rear of it down with a belt sander or something, thereby 'moving' the screw to the rear.
And there's another great idea!

Wow! Now, I can hardly believe that I didn't think of doing that. And the knob that I had planned to use had a 1/16" recessed area, in the rear!

I have already sanded it away and finish-filed the edges and now the knob fits perfectly!!!

Thank you, thank you, thank you, thank you.

- Tom
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Old 13th November 2007, 03:35 AM   #17
I_Forgot is offline I_Forgot  United States
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How about just drilling a large enough hole in the panel that the whole knob will fit through? Then you can tighten the shaft screw inside the box and you won't have any visible screw holes in the knob.

I_F
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Old 13th November 2007, 09:55 AM   #18
gmphadte is offline gmphadte  India
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Conrad Hoffman wrote
Quote:
A couple thoughts- there are/were collet type knobs where you put it on the shaft, then tightened a screw in the center front. This drew up a split collet (like on a lathe) to grip the shaft. A center cap then snapped over the front.
they are also called....chuck type

Gajanan Phadte
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Old 13th November 2007, 04:11 PM   #19
sharpi31 is offline sharpi31  United Kingdom
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Knob: Shaft-length Problem
Default Knob: Shaft-length Problem

Am I the only person to find the topic title a little amusing?

Don't worry - it's probably all in your head :-)
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Old 13th November 2007, 06:02 PM   #20
gootee is offline gootee  United States
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Default Re: Knob: Shaft-length Problem

Quote:
Originally posted by sharpi31
Am I the only person to find the topic title a little amusing?

Don't worry - it's probably all in your head :-)
Oh! Ha! Ha! :-) I didn't think about it, when I typed that.

I dated a Head Nurse, for a while. It was wonderful. :-)

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Did you hear about the guy who walked into a psychiatrist's office with a car's steering-wheel jammed halfway down into his pants? He said, "It's drivin' me nuts!".
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