Making metal inserts for knobs?
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Location: Mount Cotton, QLD
Member since 20 February 2018
Member #: 2214
Postcount: 134
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Hi all, I have a few Kriesler radios from about 1956ish. The knobs have a shiny convex metal insert glued in the centre, the glue has failed and some of the inserts are missing. Has anyone figured out a way to manufacture new discs? I tried filling the centre with filler and machining them smooth and painting them gold or silver but it looks pretty ordinary. Any ideas? Thanks
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Location: Grenfell, NSW
Member since 8 July 2015
Member #: 1771
Postcount: 212
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I would say if you made a mould and a plug you could press some out. Use hard wood for both and you might even be able to use a drill press to form them. Not sure what metal you could use, that might need some research.
Just a thought
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Clive
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Administrator
Location: Naremburn, NSW
Member since 15 November 2005
Member #: 1
Postcount: 7402
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The steel from clock springs is best. Getting a clock spring that would provide the best dimensions is the tricky bit.
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A valve a day keeps the transistor away...
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Location: Belrose, NSW
Member since 31 December 2015
Member #: 1844
Postcount: 2491
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Tippy, I assume you mean the aluminium dress discs and not the knob locking springs?
If so, Clive's answer is what you want!
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Location: Mount Cotton, QLD
Member since 20 February 2018
Member #: 2214
Postcount: 134
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I was thinking of using the aluminium from a soft drink can. It's malleable and would polish well.
I have a 3/4" wad punch so can try punching it out with that then shape it using a mould or double sided tape it to a concave mould and spin it into shape using a soft tool. I was hoping someone would say "get them from ebay, here's the link..."
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Location: Mount Cotton, QLD
Member since 20 February 2018
Member #: 2214
Postcount: 134
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Hi Ian, yes the dress discs.
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Administrator
Location: Naremburn, NSW
Member since 15 November 2005
Member #: 1
Postcount: 7402
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Hi Ian, yes the dress discs.
If that is the case then, yes, drink can aluminium would be perfect. The only hurdle that I can see is making a die to strike the correct shape.
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A valve a day keeps the transistor away...
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Location: Latham, ACT
Member since 21 February 2015
Member #: 1705
Postcount: 2175
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My email is unhidden can you send me pictures of the knobs please. I might have some.
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Location: NSW
Member since 10 June 2010
Member #: 681
Postcount: 1303
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The bottom of an aluminium drink can is much thicker than the wall and is also domed to resist the pressure. If you go for metal forming option with punch and die made from hardwood, this curvature should be a help.
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Location: Wangaratta, VIC
Member since 21 February 2009
Member #: 438
Postcount: 5401
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If there is a Lathe for machining the punch could be metal & the lathe also used to form the die. I actually made dies & punches to stamp out the clip on filters used on the binoculars.
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Location: Mount Cotton, QLD
Member since 20 February 2018
Member #: 2214
Postcount: 134
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Thanks Tallar Carl, I have emailed the photos.
Thank you STC830, that's a good suggestion.
Alas Marcc, I no longer have a metal turning lathe. Would have been a easy job if I did.
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