[Hammarlund] Home brew Hammarlund type dial drive

[Brian Burns]

Hello Mike,

 

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?

Yeah, my mother must have heard me say "I can do it myself" a whole lot. 

There was an April fool article years ago in Fine Woodworking magazine where
the guy was recommending a particular deposit of iron ore in northern
Michigan that was especially good for making your own router bits (;->). I
sure thought that was funny, because it was just the sort of thing that
appealed to me.

So, I am going to stop short at making my own IF transformers, though I
couldn't resist ordering a copy of Lindsay's booklet on making your own coil
winding machine. I am looking for the 85 kHz IF's from a BC-453 in case
anyone knows of a source.

Part of the reason for making my own dial drive is that to include the WARC
bands on a dial it needs to be rather large in diameter. I like the look of
the Hammarlund "window" onto the dial---I have an HQ-150---so I will need to
make a larger "window" in my HBR.

Cheers,

Brian   Ex: W5BRO, K6UCD

See my website: www.lessonsinlutherie.com

 

 

> 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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