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Tool Mod #2: Cambering the Iron for a Scrub Plane

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Blog entry by swirt posted 07-03-2010 04:59 AM 3652 reads 6 times favorited 5 comments Add to Favorites Watch
« Part 1: Handscrew Dogs Part 2 of Tool Mod series Part 3: New Chisel Handles »

[Appears in its entirety here: Cambering a Scrub Plane Iron but what follows is the short version.]

If you have a true scrub plane, like the Stanley 40, then you probably already have an iron with the right camber (curve) on the cutting edge. If you are in need of a scrub plane for flattening a twisted board there are a lot of good reasons to use an old wooden, transitional plane (the ones half wood with a metal carriage on top) or metal bench plane. Personally I like my Stanley #5 Jack plane that I converted to a scrub. I like the longer length and the added mass.

Converting is actually pretty easy, just back the frog back a bit to open the throat and camber the iron appropriately. Frog backed off…check. Iron cambered appropriately????

The question of how big a curve should be put on the iron is tough, and it different for every width iron. but just because it is different for every iron, doesn’t mean you should just fiddle with it and try to get it right. It is too easy to come up with a wrong angle.
Camber  scrub plane extremes and the happy medium

Finding the happy medium only takes a bit of math to come up with the perfect radius for cambering the scrub plane iron.
Calculate the radius for a perfect camber

Plug in your measurements and pop out an answer. I use 3/32” as the reveal. That lets me take a deep scrub but gives me room to back it off too.

-- Galootish log blog, http://www.timberframe-tools.com



5 comments so far

View Dennisgrosen's profile

Dennisgrosen

10850 posts in 1770 days


#1 posted 07-03-2010 05:09 AM

thank´s Swirt
favorited for future use

Dennis

View mafe's profile

mafe

9513 posts in 1744 days


#2 posted 08-22-2010 02:57 PM

Really useful info, I have been thinking if we should have a special area on LJ for handplane info.
I’m still full of questions. Like what are the correct honing angel for a Record 311, or my old Stanley 62…
Do you know any recourse for those questions?
Best thoughts,
Mads

-- Mad F, the fanatical rhykenologist and vintage architect. Democraticwoodworking.

View swirt's profile

swirt

1945 posts in 1626 days


#3 posted 08-22-2010 03:02 PM

Sorry Mafe I have no knowledge of either of those planes, but if you want to send them to me… ;)
I agree though handplane info section would be good, but probably just using the tags feature of the site is the best option.

-- Galootish log blog, http://www.timberframe-tools.com

View swirt's profile

swirt

1945 posts in 1626 days


#4 posted 10-26-2010 09:40 PM

Just updating this to say that I modified the formula to account for frog angle.

If the math gives you a headache, I made a little plane iron camber calculator to do the calculations for you. Simply enter the frog angle, the width of your iron and the actual depth of cut you want to take and it will tell you the radius needed.

-- Galootish log blog, http://www.timberframe-tools.com

View Dennisgrosen's profile

Dennisgrosen

10850 posts in 1770 days


#5 posted 10-26-2010 10:27 PM

thank´s for the update

Dennis

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