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Rust on 4-jaw chuck jaws

S

Steve Streck

Joined
Apr 3, 2019
Messages
11
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Location
Fitchburg, Wisconsin
I've been using 2 Nova 4-jawchucks for a few years. And I've been holding dozens of green bowl blanks. It seems like all of the sudden I've experienced rust on both the jaws and the chuck itself. It's strange--I've used them for so long without an issue. It seems like all of a sudden my 100 mm jaws turned from seemingly stainless steel (I know it isn't ) to rusted steel. Any advice on what to do to prevent this?
 
I have a lot of chucks and at least half are Novas, never have had rust on any chuck. My friend had Novas and while visiting I saw one of his chuck looked like it had rust. When I looked closely it seemed more like some sort of acidic action had occurred. I photographed it and got a hold of Teknatool and they were very willing to replace it but my friend said no, it worked and he didn't care what it looked like. Other than perhaps spraying some sort of protectant on the jaws I have no real answer. Perhaps get a hold of Teknatool and see what they say.
 
Yeah, you have to be careful with holding green bowls. I assume that means leaving something on the chuck overnight or more? This is especially a problem with woods like Oak, which will rust your equipment. Scotch bright or similar will remove the rust, then a bit of oil or wax does the trick.
 
I probably did keep a bowl in the jaws overnight, maybe that caused the problem. But what is odd is that the "top" of the jaws-that don't touch the wood, are similarly rusty. I will contact Teknatool and see what they say. Thanks to you both.
 
Mostly oak. Some cherry. If they are famous or doing this, then I take it this is not unusual. I've been using these jaws for 5 years of so and never had an issue, even with a lot of oak and cherry. But I did leave a few bowls in the jaws overnight. I guess I will stop that practice. Thanks.
 
I left a bowl overnight in a SN2 and did get rust on the jaws. It came off easily with wire brush. Recently bought what looks like the very earl edition SN2 because the ribbed lines are on the other end of body. The shop was not sealed completely so the body and jaws had lots of rust. Friend's son has a sandblast box and plan to go over but the chuck works as good as my newest anniversary edition.
 
I turn a lot of green stuff and often leave it on my Nova Infinity chuck the chuck overnight, wrapped with shrinkwrap to prevent cracking until I get to it the next day. (same jaws as the SN2) I use rustoleom rust remover with a wire brush to remove. Have done this 4 or 5 times over the 8 years I've been turning. doesn't take them back to "new" but they do clean up pretty good.
 
My Vicmark chucks all have a nice oxidized blackish color to them. I won't leave a green bowl on over night. The metal stains in the recess are much more difficult to remove, and the bowl can shrink enough that the recess can fail. Tenon would be fine though.

robo hippy
 
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