Plane physics

[David Ragan]

Someone had a link to an old article in FWW about the cutting forces down at the blade/wood interface.

I loved it. Cant find the poster now to ask for more.

It was a cogent discussion of cutting angle, clearance angle, and why a high clearance angle, altho good for hardwood, may not work so well for softwoods.

Can anyone direct me to more articles diving into all the nitty-gritty of this topic?

[Patrick Harper]

You might want to check out http://scienceofsharp.wordpress.com

There's some pretty good information on there that might interest you.

Do you have any idea who wrote the FWW article or when it was originally written?

[David Ragan]

You might want to check out http://scienceofsharp.wordpress.com

There's some pretty good information on there that might interest you.

Do you have any idea who wrote the FWW article or when it was originally written?

Great web site--I need to get in there and see if it goes where I'm asking

The article the Winston linked was FWW issue 39 ppg65-67; Also searched through the FWW archive, and found a couple of articles, but nothing illuminating.

[Winton Applegate]

a high clearance angle, altho good for hardwood, may not work so well for softwoods.

I think you might be conflageratin' high bevel angle or bed angle or cutting angle with CLEARANCE angle.
A LOWER clearance angle can be slightly better for hard woods and a higher clearance can be better for softer woods.
No big deal AT ALL though as long as one has enough clearance which is at least ten degrees or so.

[Winton Applegate]

the Winston
I like that . . . it is kind a like "The Molinator" (https://www.youtube.com/watch?v=dJ_TPG2a3M4)
or
"The Hulk"
but even badder.

[Winton Applegate]

Is it this one (http://planetuning.infillplane.com/html/review_of_cap_iron_study.html) ?

or this one (http://vimeo.com/41372857)?

I know you said Fine Woodworking Mag but I don’t remember that one.
I will look in my files after dinner in case I missed that one.

[Winton Applegate]

I looked but still didn't find it.
Issue #39 Souping Up The Block Plane with it's discussion of clearance angle, bevel up bed angle and bevel down geometry all discussing "Back Pressure" SEEMS TO BE WHAT YOU ARE ASKING FOR.
It is all you really need to know to get perfect results in any wood . . .
that and the setting of the chip breaker very close, .007" to .013", or there a bouts, through trial and error for the wood you are planing.
There may have been some thing in issue #2 but I don't have that one.

Could it have been this recent thread (http://www.sawmillcreek.org/showthread.php?221689-Mechanics-of-chipbreakers-and-high-cutting-angles-in-woodworking-planes-Abstract) and planing force info (http://planetuning.infillplane.com/html/mechanics_of_chipbreakers.html) ?

PS: to be clear : if the soft wood is compressing and kind of fracturing in the surface add clearance under the blade
at the expense of reduced edge durability (for a bevel down) (plaining harder woods with this shallow sharpening angle to get more clearance under the blade causes the blade to get dings on the edge; some mistake this as chipping)

End grain is a separate deal, in theory a shallower clearance angle cuts it better; note the bevel up low angle planes . . . but I think it is the shallower sharpening angle that does it; it's sharper but it is a fine line to tread because it is fragile / see above.
So cutting end grain is a separate issue, forget soft wood or hard, and the best way to deal with it is wet the wood with some paint thinner or water etc.

Really the way to go is lots of clearance and a very shallow sharpening angle 25°, even 22°, as far as planing soft wood . . .
then if the blade gets dinged up increase the sharpening angle which on a bevel down would mean less clearance as a result but not really an aim in it's self.

[Patrick Harper]

David,

I wasn't able to find anything in their archives that resembled what you were looking for either.

[David Ragan]

Wow. Be careful what you ask for. 'this recent thread' a little over my head.

I downloaded couple of articles from planetuning.infillplane.com and will read them.

The little article about 'souping up the block plane' was concise, and nice-great summary. I should left well enough alone.

[Winton Applegate]

Someone had a link to an old article _________ about the cutting forces down at the blade/wood interface

So none of these are it ?
If you find it some day let me/us know. I would like a little more nitty
wouldn't even mind some gritty.

PS: at least you inspired me to spread my rather random stack of FWW issues all over the floor while digging around in the indexes.
So I HAD FUN any way.

[David Ragan]

So none of these are it ?
If you find it some day let me/us know. I would like a little more nitty
wouldn't even mind some gritty.

PS: at least you inspired me to spread my rather random stack of FWW issues all over the floor while digging around in the indexes.
So I HAD FUN any way.

The Winton, the article you originally cited was FWW #39 ppg 65-67. Souping up the block plane
I am almost inspired to create a better sharpening station
someone said here that we may have two hobbies- shop bldg and ww

[Winton Applegate]

someone said here that we may have two hobbies- shop bldg and ww
I missed that but they are right.
Ha, ha
I wouldn't worry about it though unless you find yourself telling family members :

:mad: "You can't go in there ! :mad: You might leave foot marks on the carpet or wrinkle the upholstery. :rolleyes: The shop is just for guests and special occasions".