high temp thread lubrication?

Graphite.

Redesign so the damper actuating thread is exterior and does not get so hot. ie, thread - lever - pivot - damper

Graphite. Not toxic, stays put pretty well after initial application and running it up and down a few times.

You might also put some sort of lapping or grinding compound on it and run it up and down a few dozen times, then clean that off, to decrease the fit class of the thread, which should really be quite loose in this application, where there will be scaling and expansion issues.

Silicone grease. They sell food-grade stuff for meat grinders at restaurant supply places. The steam table pans work great for parkerizing, too,should you get into one.

Stan

Phillips Milk of Magnesia, you can buy it at most grocery or drug stores.

We have used it with great results for assembly/disassemble of heat treating fixtures.

You're kidding! Just goop it on there? Isn't that stuff runny?

Grant

No, really. We just dipped the end of the bold, and spun it down. It dries to a chalky powder and provides an excellent dry film lubricant like graphite, but is not only edible, but a lot less mess.

It dries after a bit.

"Grant" wrote: You're kidding! Just goop it on there? Isn't that stuff runny? ^^^^^^^^^^^^^^^^^^^^^ And what you have left over can be mixed with vodka to make Phillips screwdrivers.

"Edith! This is the milk of magnesia! I told you to bring me the Kaopectate!"

;-)

GROAN!

I use AMSOIL X-Treme Synthetic Food Grade Grease in the coffee roaster, but it's not rated for any 800F.

Vodka and orange juice is called a Screwdriver.

So, vodka and prune juice must be a Piledriver.

Joe Gwinn

Would talcum power (soap stone) work?

I think talc would work. As I remember it takes a higher temperature than 800 degrees F to change talc to steatite.

Dan

wrote( I think talc would work. As I remember it takes a higher temperature than 800 degrees F to change talc to steatite. ^^^^^^^^^^^^^^^^^^^^^^ If that's the case, then just rub the threads with one of your soapstone markers. (I assume that Xmilker is right that talc is soapstone) )And if it's not, maybe it would still work--it has a slippery feel.)

Graphite melts at 3675 C according to:

--Winston

Try wrapping them with plumbers teflon tape. I have used it to prevent seizing of stailess steel nuts on stainless steel bolts.

The temperatures weren that high though, but it was in live steem heat exchangers.

Not likely. For one, a pencil "lead" isn't pure graphite, for another, graphite oxidizes at much lower temperatures, especially finely pulverized graphite. I used it in a glass kiln, mixed with other stuff to keep glass from sticking to the mold. The graphite portion would be gone after a single use to say, 1200F or so.