In a 2010 thread on a discussion forum on the Practical Machinist website, "Filing Flat" ( http://www.practicalmachinist.com/vb/antique-machinery-history/filing-flat-201685/), user Bruce Johnson offers much good advice.
Early in this thread, he gives a general procedure for using a curved file to achieve a flat surface. I had been aware, previously, of the logic of using a curved file for this, but I hadn't really though through the procedure. He advises:
"The big lesson from all those apprentice projects is learning the discipline to constantly measure your own work, and make little corrections to bring it to the final shape and dimension. The process of hand filing a surface to flat is all about checking it with a straightedge, finding a bump, then using a cruved file (or a scraper, or whatever) to trim the bump down. Repeat, repeat, repeat until you can't find any more bunps. Then it's flat."
In a 2010 thread on a discussion forum on the Practical Machinist website, "Filing Flat" ( http://www.practicalmachinist.com/vb/antique-machinery-history/filing-flat-201685/index2.html), user Bruce Johnson offered very good advice ( see above) on filing flat using a curved file. The question of how he curved his files came up. It's worth going to the original thread on Practical Machinist to see his explanation directly.
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