|Paul M||16/03/2020 11:42:16|
|43 forum posts|
I have just been given a set of imperial slip gauges that have been sitting in a garage for some years. A number of the gauges are slightly pitted with rust.
Any suggestions for getting the gauges back to a state where I can at least use them for setting and testing measurements accepting they may not be good enough to be part of a stack.
|Mick B1||16/03/2020 11:48:12|
|1726 forum posts|
Scotchbrite (or B&Q's cheap imitation of it) and WD40 works on my lathe chuck and slide tops if rust spots appear. They disappear as if they'd never been - visually at least.
Edited By Mick B1 on 16/03/2020 11:49:12
|Howard Lewis||16/03/2020 12:30:20|
|3605 forum posts|
Any abrasive is likely to remove material, but since we are unlikely to be working to hundredths of a thou, in a temperature and humidity controlled environment, it probably won't matter.
The object is to remove any rust standing above the hardened surface. Rust pits below the surface will not affect the dimension, although unsightly.
They may now be incapable of being wrung together, but should suffice for most purposes.
Just use the finest grade of Scotchbrite that you can get, which may be red, I think.
|Dave Wootton||16/03/2020 13:12:15|
|77 forum posts|
I was given an old set of slips, unfortunately poorly stored so quite rusty in some places, I soaked them in citric acid for a few days which got rid of the rust, left it with an overall grey colour then went over them with fine scotchbrite and WD40.
Still pitted but the pits are below the working surface and the rust has all gone , they are good enough for anything I'm likely to do, I find them very useful, just used them to set up loco slidebars, maybe if they were pristine I might be more reluctant to use them!
My workshop is definitely not temperature controlled!
1189 forum posts
Before going as far as an abrasive like Scotchbrite, the motorcyclist's trick for removing rusts spots from polished chrome, is to use crushed aluminium foil and Coke ( or a brand equivalent that still has a bit of phosphoric acid in it.)
N.B. I've never tried either of the above with slip gauges.
|Nick Clarke 3||16/03/2020 13:57:30|
883 forum posts
Leave to soak in molasses (Black Treacle) for a while.
I have used this successfully on rusty camera parts - aperture blades
|Kiwi Bloke||16/03/2020 20:11:34|
|461 forum posts|
Nick. Interesting - what does molasses do to the blueing/blacking on the iris blades?
For the slips, I suppose the safest and most effective rust removal method is electrolytic.
|old mart||17/03/2020 18:12:53|
|1981 forum posts|
I would try a brass brush and oil, but make sure the brush is real, not plated steel.
Please login to post a reply.
Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!
You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.
Click THIS LINK for full contact details.
For subscription issues please see THIS LINK.