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Steve G4WCS 20th Apr 2019 9:25 pm

“Spun” knob inserts
4 Attachment(s)
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

Kentode 21st Apr 2019 8:41 am

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.:thumbsup:

Jac 22nd Apr 2019 8:05 am

Re: “Spun” knob inserts
Great job!

How did you make them?


Studio263 23rd Apr 2019 11:07 am

Re: “Spun” knob inserts
1 Attachment(s)
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.

Steve G4WCS 23rd Apr 2019 8:59 pm

Re: “Spun” knob inserts
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

Jac 24th Apr 2019 6:56 am

Re: “Spun” knob inserts
The end result looks excellent.


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