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 Post subject: Re: Dial Cord Slipping? Here is the FIx
PostPosted: Oct Tue 24, 2017 3:54 pm 
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Location: Mission Viejo, southern California
It seems that many of these drives were not well designed, so repairs Hopson the 1930s and later used rosin and such.

The fiberglass electrical tape Stan told us about at a SCARS class really helps on the drives which use a belt, such as many Zenith models. It did the trick on my 13 tube Western Air Patrol with a new round cross section belt.

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 Post subject: Re: Dial Cord Slipping? Here is the FIx
PostPosted: Oct Tue 24, 2017 4:05 pm 
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Joined: Jun Sun 09, 2013 1:08 pm
Posts: 471
Location: Richmond, VA
This particular drive was not well designed. I am having to invent a solution to the drive cord slipping.

A flat belt requires a pulley raised in the middle. A round belt needs a concave pulley. And I have found that a dial cord works best just wrapped around a round shaft.

When you pull this dial cord tight it tends to climb up the sides of the pulley which is on the end of the tuning shaft.


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 Post subject: Re: Dial Cord Slipping? Here is the FIx
PostPosted: Oct Tue 24, 2017 10:38 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Haledon, NJ, usa
jameswross wrote:
This particular drive was not well designed. I am having to invent a solution to the drive cord slipping.

A flat belt requires a pulley raised in the middle. A round belt needs a concave pulley. And I have found that a dial cord works best just wrapped around a round shaft.

When you pull this dial cord tight it tends to climb up the sides of the pulley which is on the end of the tuning shaft.

Some dial string arrangements use a drive shaft with the knob on it and that shaft has a v-shaped area to wind the string around 2-1/2 times.
That sloped groove MUST be very clean and shiny so as the string climbs up the sides it slides back down... just right.
Otherwise the string overlaps itself and gets stuck on itself.
Clean and shiny ... is the answer there. Everywhere else clean is the answer too and free moving rollers everywhere.

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 Post subject: Re: Dial Cord Slipping on French Oceanic 49
PostPosted: Oct Tue 31, 2017 7:36 pm 
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Joined: Jun Sun 09, 2013 1:08 pm
Posts: 471
Location: Richmond, VA
The Oceanic 49 uses 2 dial cords on the big pulley on the tuning gang.

(one goes to the knob shaft the other goes to the dial pointer)

Does any one have the proper routing for these 2 dial cords? Thanks very much!


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 Post subject: Re: Dial Cord Slipping on French Oceanic 49
PostPosted: Nov Sun 12, 2017 1:04 pm 
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Joined: Jun Sun 09, 2013 1:08 pm
Posts: 471
Location: Richmond, VA
FIXED. Had a half turn too many around the tuning gang pulley. Caused binding.


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