04-03-2021, 12:12 AM
(This post was last modified: 04-03-2021, 12:13 AM by Stuart Giles.
Edit Reason: missing word
)
Oxalic acid only attacks rust, it doesn't have any measurable effect on good metal. Amongst many other iron and steel bits, I have used it on a Jones and Shipman tool/cutter grinder that I bought for scrap money with a seized column. After using a 30 ton press to remove the column from the machine, it went in an Oxalic bath for a few days.
Before:
![[Image: 51001353351_21d70fcd06_z.jpg]](https://live.staticflickr.com/65535/51001353351_21d70fcd06_z.jpg)
After:
![[Image: 51001470407_7571d22be8_z.jpg]](https://live.staticflickr.com/65535/51001470407_7571d22be8_z.jpg)
There is staining where the Oxalic acid has removed the rust, but there has been no effect on what was clean metal. This column (which elevates the grinder's wheelhead) is a precision fit in the machine; following this treatment it still has an accuracy well inside a thousanth of an inch.
Before:
After:
There is staining where the Oxalic acid has removed the rust, but there has been no effect on what was clean metal. This column (which elevates the grinder's wheelhead) is a precision fit in the machine; following this treatment it still has an accuracy well inside a thousanth of an inch.