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Old 11-10-2020, 12:37 PM
Steve Hackel Steve Hackel is offline
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Default Lubricating a shrinking disc

Honestly, must be getting old and can't remember... Working on the fenders for my model A' and it's been years since I pulled out the shrinking disc for the multitude of dents on these fenders. What have you used as a lubricant for the disc, and I'm getting an excessive amount of Galling and marks from the disc.
I currently have one of Wray Schelin's flat discs, and several of the ribbed designs from Scott Knight , so I just need a bit of direction to get my head back on straight. Thanks, Steve
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Old 11-10-2020, 03:33 PM
latoracing latoracing is offline
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I have been using soapy water with decent results. There is minor galling and I keep the disc clean.
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Old 11-10-2020, 04:39 PM
John Buchtenkirch John Buchtenkirch is offline
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Bar soap, Ivory to be exact. ~ John Buchtenkirch
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Old 11-10-2020, 05:58 PM
Chris_Hamilton Chris_Hamilton is offline
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Beeswax also works well.
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Old 11-11-2020, 01:21 AM
Brzeczyszczykiewicz Brzeczyszczykiewicz is offline
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Greasy soap with tallow. Such as is used for spinning.
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Old 11-11-2020, 02:04 PM
dwmh dwmh is offline
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I seem to remember that Wray covers the area with a broad magic marker which acts as lubricant.
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Old 11-14-2020, 08:00 PM
Rick Mullin Rick Mullin is offline
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I use a bar of Ivory soap also. A single swipe in the area is all you need. Perhaps more important is the need to keep the disk clean and a light polish with 320. I put some 320 on my 3 inch angle grinder and buff the surface of the disc. I have both flat and rippled discs and this works on both styles. I prefer the Sunchaser disc on aluminum and steel. If the surface of a steel panel gets burnished, I lightly buff the surface with 220. A burnished surface will be very difficult to continue shrinking with a disc.
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Old 11-19-2020, 01:52 PM
crystallographic crystallographic is offline
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Quote:
Originally Posted by Rick Mullin View Post
I use a bar of Ivory soap also. A single swipe in the area is all you need. Perhaps more important is the need to keep the disk clean and a light polish with 320. I put some 320 on my 3 inch angle grinder and buff the surface of the disc. I have both flat and rippled discs and this works on both styles. I prefer the Sunchaser disc on aluminum and steel. If the surface of a steel panel gets burnished, I lightly buff the surface with 220. A burnished surface will be very difficult to continue shrinking with a disc.

Ivory soap flakes - also used in pressing/drawing operations, and mixed with another oil.

Old school. Good school.
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Old 11-20-2020, 12:40 AM
Steve Hackel Steve Hackel is offline
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An up date on my request for information..... Thanks !

I tried band saw blade lubricant (tallow ?) , grease, Ivory soap,
and straight paraffin wax used for treating hands and sometimes making expensive scented candles - and the winner is - PARAFFIN WAX !!!!!
The paraffin actually reduced the noise considerably, there was visibly less scratches and galling , and overall it was cleaner to use.

My only concern is that it does take more effort / pressure on the disc in order to create enough heat to cause the shrinking to take place.
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Old 11-20-2020, 01:56 PM
Rick Mullin Rick Mullin is offline
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Paraffin was one of the things that I tried early on. It was too much lubricant. The key to success is all about a polished disc. As soon as there is any deposit on the disc, it will worsen exponentially and transmit to the surface you are shrinking. If polished (320 grit) it only takes a small strike of Ivory.
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