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Truing the edges of a plate

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Jonny:
Used to draw file everything at work working to microscopic tolerances, its quite easy.
Meant for smoothing and slight dips and peaks plus in our instance with V springs running in direction of compression before turning (forging.)

Used to draw file with a 12" bastard most of the time unless finished product where above three square and an oil used prior to a polish.

Jonny:
The two springs in flat state here are draw smoothed prior to turning, maybe 2nd cut.
http://pic20.picturetrail.com/VOL15/728921/3960275/49395274.jpg

80% of this was draw smoothed and filed to shape within thous.
http://pic20.picturetrail.com/VOL15/728921/3960275/379943086.jpg

bp:
During my apprenticeship, at one stage I was making loft plates, which involved cutting and filing a profile to (ideally) half way through an 0.008" thick line, the material was generally 1/8" Al Alloy although some were 1/8" or 1/4" gauge plate.  The inspector wanted to see a draw filed profile as they generated less drag to the router, some of the profiles were 8' (that's 96 inches) long and gently curving.  This enabled the development of draw filing skills to quite a high level!! 
Even now, over 40 years later I can still file to a line and (split a thickish one!) nice and square etc etc, I just don't do it very much, because I can.........., machining is less effort, just twiddling a handle!!
cheers
Bill Pudney
Adelaide, Australia

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