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Old 20th Apr 2019, 9:25 pm   #1
Steve G4WCS
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Default “Spun” knob inserts

Had a go at making some knob inserts.
Only 15 though thick but had a sharp little parting tool and some nice ally bar.
They look a bit “new” but will dull down with age
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Old 21st Apr 2019, 8:41 am   #2
Kentode
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Default Re: “Spun” knob inserts

As an apprentice at Ferranti's l would have knocked out a few dozen of these on a Saturday morning when the "important" jobs got done.

Those look very good and would completely fool me from across a room.
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Old 22nd Apr 2019, 8:05 am   #3
Jac
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Default Re: “Spun” knob inserts

Great job!

How did you make them?

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Old 23rd Apr 2019, 11:07 am   #4
Studio263
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Default Re: “Spun” knob inserts

Here are some I made for a Roberts R606MB (picture attached). One of the push button ones and one of the tone control ones are original, the rest are home made. In my case I bored the knobs out a little so that the metal could be left thicker, that made parting them off a bit easier.
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Old 23rd Apr 2019, 8:59 pm   #5
Steve G4WCS
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Default Re: “Spun” knob inserts

Jac.
I turned a length of free machining aluminium bar down to the right diameter.
Faced it off with a sharp lathe tool and played about with the feed until the surface looked right, then with a parting tool, parted thin “slices” off at the correct thickness
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Old 24th Apr 2019, 6:56 am   #6
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Default Re: “Spun” knob inserts

Thanks!
The end result looks excellent.

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