Reply To: Juuma low angle jack plane sole flattening
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My big question how dose your plane perform now?
Place an engineered straight edge in middle of plane sole and get a 3 thou feeler gauge if gauge slips under straight edge you may need to flatten also do test with straight edge diagonally from corner to corner of sole.
The other way is to place plane on flat surface and try and slip feeler gauge between sole and flat surface all the way round.
An engineered straight edge is quite a good thing to have because at least you have a reference for straight like having a good known square that is square. You need to check your glass to see how flat it is. If it is more than a thou out could make things worse.
Abrasive I would probably start at 120 Grit up to about Max 400 Grit.
You can use Diamond plates which better makes are within 1/2 a thou.
The problem with Diamond plate is that I find them too small for task as you can tip either end of plate which defeats the object of trying to keep flat.
I am no authority on flattening plane soles but have performed technic on several older planes.
Other people my have different views on matter and may be worth listening to them as well.