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Corrugated bottom on plane?

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Forum topic by RussellAP posted 844 days ago 1695 views 0 times favorited 23 replies Add to Favorites Watch
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RussellAP

2950 posts in 923 days


844 days ago

Can someone tell me the advantages or lack, for having a plane with a corrugated bottom?

-- A positive attitude will take you much further than positive thinking ever will.


23 replies so far

View jacob34's profile

jacob34

454 posts in 901 days


#1 posted 844 days ago

I just watched a video on hand planes http://www.woodworkingonline.com/2009/04/17/podcast-40-three-hand-planes-every-shop-should-have/ where at the end the question was asked and he felt that it was a marketing ploy that serves no real purpose. Although I do not think he was an expert on the subject and I am not either.

-- so a bear and a rabbit are sitting on a log

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BTimmons

2117 posts in 1122 days


#2 posted 844 days ago

The grooves mean that there’s less material that’s contacting the board surface that the plane rides on. That means a little less friction, and it also means less time is spent flattening the sole since you don’t have remove so much metal. You see hollows and grooves cut into the backs of Japanese chisels and plane blades, too. For one thing, the steel they use is extremely hard so it makes sense to have less surface area to flatten while sharpening.

-- Brian Timmons - http://www.BigTWoodworks.com

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HillbillyShooter

4510 posts in 929 days


#3 posted 844 days ago

The corrugated bottom reduces drag and is more beneficial in the larger planes, i.e. 5-1/2 and above.

-- John C. -- "Firearms are second only to the Constitution in importance; they are the peoples' liberty's teeth." George Washington

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Dwain

323 posts in 2496 days


#4 posted 844 days ago

I would agree with the marketing idea. It seems that after building a pretty good plane, Stanley (Bailey) needed to find a reason for us to buy other planes. I agree with every said above, but I don’t think those reasons are really appreciable. I know all of my type 11’s are corrugated. I just like them more…

-- When you earnestly believe you can compensate for a lack of skill by doubling your efforts, there is no end to what you CAN'T do

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ShipWreck

536 posts in 2389 days


#5 posted 844 days ago

I have two “C” planes in the collection so far. They do smooth alot easier.

View RussellAP's profile

RussellAP

2950 posts in 923 days


#6 posted 844 days ago

So the C designation means corrugated.

-- A positive attitude will take you much further than positive thinking ever will.

View Bill White's profile

Bill White

3426 posts in 2597 days


#7 posted 844 days ago

Russell, I’ve got both. I can’t see any difference in performance. There might be an argument as to whether the “c” planes are easier to flatten (if needed), but I don’t know of anyone who has whined about not having “c” soles.
To me it is kinda like which pasta do ya like best.
Bill

-- bill@magraphics.us

View Don W's profile

Don W

14910 posts in 1204 days


#8 posted 844 days ago

A lot of experts agree its was a marketing stint. I agree with Bill, I’ve tried to tell the difference and can not.

-- Master hand plane hoarder. - http://timetestedtools.com

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cabmaker

1311 posts in 1446 days


#9 posted 844 days ago

For me, I prefer a smooth sole simply because it is easier for me to sight the iron alighnment. I do have a few C s however but that is not by desighn. A C sole will function with a bit less resistance but not enough to loose any sleep over. Jacob, your observation is accurate, there are many, many videos on the subject and some are conflicting. Best to talk to someone that have used the things professionally.

View Don W's profile

Don W

14910 posts in 1204 days


#10 posted 844 days ago

I believe it was Paul Sellers that didn’t like the corrugated soles because he thought they would get clogged. I actually prefer a smooth sole on a jointer, although both my #8 and #608 are corrugated.

-- Master hand plane hoarder. - http://timetestedtools.com

View Smitty_Cabinetshop's profile

Smitty_Cabinetshop

9830 posts in 1255 days


#11 posted 844 days ago

In use, there is none.

-- Don't anthropomorphize your handplanes. They hate it when you do that. -- OldTools Archive

View Brett's profile

Brett

621 posts in 1320 days


#12 posted 844 days ago

It may seem counter-intuitive, but grooves shouldn’t have any affect on the amount of friction that a plane experiences when it’s pushed across a board.

Friction force is equal to the downward force (due to gravity plus the force you are exerting on it) times a coefficient that depends only on two materials in contact. For cast iron and oak, that coefficient is 0.49. So, if your plane weighs 7 lbs (like a jointer) and you add 3 pounds of downward force to it, the friction force as the cast iron plane is pushed over an oak board is 4.9 lbs. It doesn’t matter how much or how little contact area there is between the cast iron and wood; the only things that are important are the downward force (10 lbs) and the coefficient of friction. If you put paraffin or a light oil on the sold of your plane, the coefficient will go down, perhaps to as little as 0.075, which means your friction force would be 0.75 lbs.

(Whew—that’s enough geek talk for one day.)

-- More tools, fewer machines.

View David Craig's profile

David Craig

2135 posts in 1745 days


#13 posted 844 days ago

Personally, I would think the chief advantage would be in flattening the plane itself. Corrugation would translate to less material to be removed from the plane body.

-- There is little that is simple when it comes to making a simple box.

View TopamaxSurvivor's profile

TopamaxSurvivor

14727 posts in 2312 days


#14 posted 844 days ago

A friend of mine hand planed a truck load of walnut stock blanks. He told me the corrugated was much easier to push.

-- "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

View ShipWreck's profile

ShipWreck

536 posts in 2389 days


#15 posted 844 days ago

To be honest, I feel no difference in resistance/friction on the shaving stroke between the smooth and the corrugated.

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