[Hammarlund] Home brew Hammarlund type dial drive

[Mike Cornell]

Brian - sounds like you want to make this completely home brew.  Would you consider using a pinch drive from a donor Hammarlund or other set?

> From: brian at lessonsinlutherie.com
> To: hammarlund at mailman.qth.net
> Date: Tue, 4 Nov 2014 12:56:27 -0800
> Subject: Re: [Hammarlund] Home brew Hammarlund type dial drive
> 
> Hello again Avery,
> 
> ~ The Handbook had a number of Novice-level receiver projects back in the
> '50s and '60s, IIRC, that utilized a scratchbuilt friction drive based on a
> rubber grommet contacting a shaft or circular dial. I'll take a look tonight
> or tomorrow to see if memory serves correctly.
> 
> I googled "friction drive" and came across a fix on e-ham for slipping
> drives in Heath receivers. There weren't any drawings or photos, but if I
> understand the text, the cure is a couple of "O" rings. So I'm thinking of
> trying two O rings between two washers, all closely matched to the diameter
> of a 1/4 inch shaft.
> 
> Cheers,
> 
> Brian
> 
> 
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