More questions on finish planing

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Forum topic by groland posted 08-09-2010 10:17 PM 770 views 0 times favorited 2 replies Add to Favorites Watch
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149 posts in 2835 days

08-09-2010 10:17 PM

To close up the blade opening to get the thinnest possible shavings, as is always suggested for this, don’t you have to move the blade support forward leaving the blade unsupported?

I’m confused here because some plane setup instructions emphasize that the ramp that holds the blade line up with and be continuous with the back edge of the mouth on the plane’s sole in order to provide support to the blade and eliminate chatter.

Thanks for clarification,


2 replies so far

View swirt's profile


2107 posts in 2395 days

#1 posted 08-09-2010 10:47 PM

Yes ideally you want the most support as possible, but for most fixed mouth planes you need to move the frog forward to close up the mouth. That’s why galoots cringe when they see some old plane that somebody took a file to in order to open up the mouth as a method for keeping the plane from choking (getting shavings stuck i the mouth).

-- Galootish log blog,

View paratrooper34's profile


867 posts in 2375 days

#2 posted 08-11-2010 07:16 AM

It is best to have the blade supported as much as possible when taking shavings that are not on the finish level; i.e. dimensioning/sizing with a jack plane. But when you are using a smooting plane for final finishing, those ultra thin shavings don’t place as much stress on the blade, so you can get away with closing up the mouth by moving the frog slightly forward without experiencing chatter. You must have a very sharp blade as well.

-- Mike

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