[Hammarlund] Home brew Hammarlund type dial drive

[Bill Cromwell]

Hi Brian,

I liked the two dials on the Hammarlunds, too. I had a HQ145-X. I don't 
remember what size those disks were but maybe smaller than 5 inch CDs. I 
have considered building a set of those, too. There was a design 
published somewhere that used a small rubber grommet instead of O-rings. 
The disk rides in the groove of the grommet. I think the design had a 
pair of metal washers with one on each side of the grommet and a nut 
against each washer. The shaft was threaded and the nuts adjusted the 
position of the grommet to align with the disc and the amount of 
'tension' or the amount of 'pinch'. It would be a little fussy getting 
all of that setup just right but no more effort than building your own 
radio from scratch.

I'm in northern lower Michigan. Just where is this wonderful iron?

73,

Bill  KU8H


On 11/04/2014 04:30 PM, Brian Burns wrote:
> 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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