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Cabinet and Chassis Restoration and Refinishing For help with cabinet or chassis restoration (non-electrical), please leave a message here. |
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13th Sep 2012, 1:03 pm | #1 |
Retired Dormant Member
Join Date: Sep 2003
Location: Bristol, UK.
Posts: 808
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Dial drives
Are there any basic books on design of dial drives? I am thinking of something like the basic books on electricity that cover Ohm's Law?
When I get a set with a broken cord, tangled at the bottom of the case. I use trial and error. What I don't do is keep notes on what I did, usually because I have so many attempts, I can't remember which nearly worked and which failed miserably. Once it is working I quit while I am winning and don't touch anything. There are some things that happen often :- dial turning the wrong way, not covering the full range of the dial or capacitor, working one way but unwinding the cord so it does not work turning back. With circular dials it I can see it as pulleys connected by a belt. Going to a linear scale from here is also fairly obvious. What throws me is when the belt is fixed to the capacitor wheel with a spring and makes more than one turn round the wheel. I would like to get to a stage where I can avoid the common silly things. I did find a USA site with a great number of examples of drives for specific sets. Occasionally I have recognised a similar arrangement to mine but it is hard to search them all. |
13th Sep 2012, 10:20 pm | #2 |
Rest in Peace
Join Date: Jul 2004
Location: Dartford, Kent, UK.
Posts: 1,661
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Re: Dial drives
There is a good article on dial cord drives in Radio Constructor magazine, April 1971, part of the "In Your Workshop" series with Dick and Smithy. Available here:-
http://vintageradio.me.uk/radconnav/1971/apr71-1.htm Very well written as usual. Regards, Mick. |
13th Sep 2012, 10:42 pm | #3 |
Octode
Join Date: Jul 2011
Location: Leicester, Leics. UK.
Posts: 1,681
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Re: Dial drives
There's a djvu book on the web link I recently posted 'Sam's Dial Cord Diagrams'. Not sure how good it is.
http://www.tuberadio.it/docs.htm Tony Last edited by greenstar; 13th Sep 2012 at 10:43 pm. Reason: link |
14th Sep 2012, 9:45 am | #4 |
Retired Dormant Member
Join Date: Sep 2003
Location: Bristol, UK.
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Re: Dial drives
Mick and Tony, Many thanks for your replies. I think the Sam's Dial Drives was the one I found. It is a very comprehensive set of diagrams. If there is one for the set in question it is very easy to follow. I just found it laborious searching for a specific set. I got the feeling also that there were few European sets. The "Your Workshop" piece is the sort of thing I was looking for as there are explanations as to why things happen and it will give some direction to my flounderings.
I don't mind the electronics problems. The mechanical bits often frustrate me. Apart from the dial drives there are so often silly things like :- How do I get the chassis out, where are all the securing screws, and how on earth did anyone get a spanner on that nut? There is also the principle I have found, that there is always one bolt that is rusted and seized. Usually the last one. Regards |
14th Sep 2012, 10:02 am | #5 |
Octode
Join Date: Jul 2009
Location: Carmel, Llannerchymedd, Anglesey, UK.
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Re: Dial drives
I seem to recall that "Wireless & Electrical Trader" or similar, used to include a diagram of the dial drive when publishing service info. for a particular set. I am sure that some avid collector must have some of these stashed away in a dusty corner!
Les. |
14th Sep 2012, 10:03 am | #6 | |
Octode
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Location: Carmel, Llannerchymedd, Anglesey, UK.
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Re: Dial drives
Quote:
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14th Sep 2012, 11:28 am | #7 |
Retired Dormant Member
Join Date: Sep 2003
Location: Bristol, UK.
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Re: Dial drives
Very fitting!
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