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 Post subject: Flattening a warped dial, Truetone D724
PostPosted: Jun Sat 28, 2014 2:55 am 
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Location: Bristol, Rhode Island
This is probably old hat to you guys, but I figured I would show the dial for a Truetone D724 I flattened. I wish I had a photo of it as found. Super warped all around, totally unusable. So I got two 12" square ceramic tiles we had left over from a kitchen job, put the dial between them, put a small anvil on top to compress and baked it for about an hour at 200. Took it out and put it on the porch for another two hours or so to let it cool. It's perfectly flat. Came out far better than I would have expected! So glad I was able to save the original.


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Last edited by Diverted on May Thu 05, 2016 8:18 pm, edited 1 time in total.
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 Post subject: Re: Flattening warped phenolic dial, Truetone D724
PostPosted: Jun Sat 28, 2014 4:12 am 
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That's good to know! It will inevitably come in handy!


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 Post subject: Re: Flattening warped phenolic dial, Truetone D724
PostPosted: Jun Sat 28, 2014 4:27 am 
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He, he, for a bonus a 200 deg anvil too. OUCH!

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 Post subject: Re: Flattening warped phenolic dial, Truetone D724
PostPosted: Jun Sat 28, 2014 11:15 pm 
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Location: Clinton Twp. Mi.
Great job of figuring this out but i have to ask how long did this really take you? If i had tried this i would have had a melted piece of plastic and a kitchen that stunk for a week. I can understand the ceramic tile but how did you find the correct temperature and time for it.
Stan Ski


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 Post subject: Re: Flattening warped phenolic dial, Truetone D724
PostPosted: Jun Sun 29, 2014 7:49 pm 
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Joined: Jan Thu 24, 2013 11:50 pm
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Location: Bristol, Rhode Island
How long did it really take me? About an hour at 200, as I wrote earlier. I put it in while the oven was still cold, and the tiles slowly heated it. Then I let it slowly cool down on the porch; there was never any smell, and the dial didn't discolor or have any other problems.

I went with 200 as that's the coolest my oven will warm to. After about 40 minutes I started checking every five minutes or so to see if the waviness was gone yet. After an hour it was perfectly flat so out it came.


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 Post subject: Re: Flattening warped phenolic dial, Truetone D724
PostPosted: Jul Sat 05, 2014 1:42 pm 
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Joined: Jun Wed 12, 2013 1:30 pm
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Location: Southport NC
Ill second the process. Same dial. Buy replacement for 30 or try this method. Same temperature /200 for an hour...but I just shut off the oven and took it out hours later. If you have one of these big ones like this ..its worth the shot as opposed to finding/buying a replacement. Wont put back the faded red lettering (Im kidding obviously) but at least the risk of the pointer rubbing against the dialface is gone...and it will look better illuminated.


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 Post subject: Re: Flattening warped phenolic dial, Truetone D724
PostPosted: Jan Sat 02, 2016 11:09 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 6373
Location: Wilmington, NC 28412 USA
What I have done with some I straightened.

I cut 2 pieces of Plexiglas Slightly larger than your Dial.
The ones I did had a Hole in center for the Tuner. So I just sandwiched the dial in between the 2 pieces of Plexiglas.

Put bolt through center snug up slowly to compress Dial.

I then put dial into a large Bowl of Water that I had heated to 150 degrees in the MicroWave.
I let it set in the water til it cooled, I then re snugged the Bolt and repeated the dunk in the 150 degree water.

Remove assembly , but do not remove bolt until the assembly (Dial and Plexi) are at room temp.

Works for me.

If no hole in center, you have to figure away to clamp .

Bob T


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 Post subject: Re: Flattening warped phenolic dial, Truetone D724
PostPosted: Jan Sun 03, 2016 6:40 am 
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Location: Brooklyn, NY
Diiverted's method worked perfectly for me!

First time in I was a bit reluctant, so I only did 200 degrees for 15 minutes. The outcome was about 70% there and I proceeded to the next time for 22 minutes, job done!



Vin


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 Post subject: Re: Flattening warped phenolic dial, Truetone D724
PostPosted: Apr Sun 17, 2016 2:22 am 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: 253 Blanche St. Plymouth, MI USA
change your header, that dial is not phenolic. Phenolic wont melt. That dial is some kind of acetate I think, similar to the "dial cover" material. Shrinks as it ages, causing the warping and often, cracking.
Mark Oppat


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 Post subject: Re: Flattening warped phenolic dial, Truetone D724
PostPosted: Apr Thu 21, 2016 11:56 pm 
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Location: Olympia WA USA
I wanted to try your idea, but my anvil is too big & heavy to fit into the oven. It weighs in at 225 lbs. :shock:

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 Post subject: Re: Flattening warped phenolic dial, Truetone D724
PostPosted: May Thu 05, 2016 8:18 pm 
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Joined: Jan Thu 24, 2013 11:50 pm
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Location: Bristol, Rhode Island
Frank, you need a bigger oven!


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 Post subject: Re: Flattening a warped dial, Truetone D724
PostPosted: May Fri 06, 2016 11:06 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Butte, MT USA
If you know anyone with a dry mounting press (I found one cheap at a yard sale) you could probably achieve the same ends without the oven.
I've used mine to flatten a number of things, and you can set the temperature accurately.


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