Edge jointing planes

[Karl]

Hi all

I had a general query regarding Jointing planes, and hope that somebody can satisfy my curiosity.

I believe that perceived wisdom is that any edge over a few feet long should be jointed with a #7 or higher (like Rob's WIP woodie), depending on the length of the board.

But why is this?

I read (probably on this forum) that the LV BU Jointer, whilst the same size as a #7, has the jointing "performance" of a #8 because the mouth is set back a little further from the toe than a #7. Is this true? If so, what about HNT try/jointer planes - their mouths are even further back from the toe. On Terry Gordon's website he refers to jointing boards upto 6' long with a Try plane - 18". Yet one seldom hears of a Bailey pattern #6 plane being used to joint such long edges.

Hope this makes sense.

Cheers

Karl

 

[Paul Chapman]

The theory is that a short plane will tend to follow the undulations in a long board rather than straighten them out, so the longer the board the longer the plane for best results. However, the reality is that if you keep planing a board along its full length, you will eventually plane it into a convex shape - try it, its true. So whatever particular jointer plane you are using, you need to understand what's going on, regularly check with a straight edge and take stop shavings to end up with a straight edge.

Hope that makes sense :? :? :lol:

Cheers :wink:

Paul

 

[AHoman]

On Terry Gordon's website he refers to jointing boards upto 6' long with a Try plane - 18". Yet one seldom hears of a Bailey pattern #6 plane being used to joint such long edges.

Hi Karl,
I use this plane to joint edges:

It is about 18" long, and I believe that the length of the toe ahead of the blade is longer than the toe on my #7.
Cheers,
Andy
P.S. I'm not sure why the image is not showing up.

 

[bugbear]

Hi all

I had a general query regarding Jointing planes, and hope that somebody can satisfy my curiosity.

I believe that perceived wisdom is that any edge over a few feet long should be jointed with a #7 or higher (like Rob's WIP woodie), depending on the length of the board.

But why is this?

I read (probably on this forum) that the LV BU Jointer, whilst the same size as a #7, has the jointing "performance" of a #8 because the mouth is set back a little further from the toe than a #7. Is this true? If so, what about HNT try/jointer planes - their mouths are even further back from the toe. On Terry Gordon's website he refers to jointing boards upto 6' long with a Try plane - 18". Yet one seldom hears of a Bailey pattern #6 plane being used to joint such long edges.

Hope this makes sense.

Cheers

Karl

Consider the size (hence radius) of the circle that can be drawn through the toe, blade, and heel.

BugBear

 

[Derek Cohen (Perth Oz)]

P.S. I'm not sure why the image is not showing up.

Andy

there is a space between .jpg and [/b]

Remove it and the image will appear.

Regards from Perth

Derek

 

[AHoman]

Remove it and the image will appear.

Voila! Thank you, Herr Doktor!
-Andy

 

[Karl]

Andy - that's a nice plane - homemade?

BB - sorry, don't understand your comment. could you explain? unless I am missing something?

Cheers

Karl

 

[AHoman]

Karl,
Thank you for the kind words -- yes, I made that plane last winter. The wood is hophornbeam.
-Andy

 

[Karl]

Andy

Is that Jig arrangement on the bench how you shoot your edges - ie runnning the plane on its side along the bench?

Cheers

Karl

 

[bugbear]

BB - sorry, don't understand your comment. could you explain? unless I am missing something?

BugBear

 

[Karl]

Bugbear - thanks for the diagram. Was having a blonde moment :lol: and didn't consider the blade projection.

So, are you saying that calculating the radius of the circle you detail gives you a maximum (in the loosest sense of the word) planing length of any particular plane???? Also, the radius would increase in size if a finer shaving were taken.

I've not heard of this before - interesting.

Cheers

Karl

 

[mr]

Andy

Is that Jig arrangement on the bench how you shoot your edges - ie runnning the plane on its side along the bench?

Cheers

Karl

That looks like a pair of planing stops to me, one at the end one at the side to prevent lateral movement. Used for normal planing not shuting / shooting however you want to spell it.

Cheers Mike

 

[Karl]

Mike - I see that now i've had a second look. At first I thought the piece held down with a holdfast was slid under the work, raising it off the bench, thereby enabling edge shooting.

Cheers

Karl

 

[AHoman]

Is that Jig arrangement on the bench how you shoot your edges - ie runnning the plane on its side along the bench?
l

Hi Karl,
Sorry for the confusion -- when I took this particular shot (last spring), I was taking some high spots off of the face of a long board (hard maple). The holdfast is holding a batten to prevent the end of the board from swinging out when I reach the other end. I'm left-handed, by the way, so the direction of planing is from left to right. The thing-a-ma-jig on the far left is a substitute for an end vise, in this case!
Primarily, though, I use this plane for edge jointing -- I just didn't have a picture of that.
-Andy

 

[bugbear]

Bugbear - thanks for the diagram. Was having a blonde moment :lol: and didn't consider the blade projection.

So, are you saying that calculating the radius of the circle you detail gives you a maximum (in the loosest sense of the word) planing length of any particular plane???? Also, the radius would increase in size if a finer shaving were taken.

I've not heard of this before - interesting.

Karl

You can also see (as in visualise) the effect of having the blade more central, as in Lee Valley #6, with its longer toe.

http://nika.frontier.iarc.uaf.edu/~cswi ... =1#message

BugBear

 

[Paul Chapman]

So, are you saying that calculating the radius of the circle you detail gives you a maximum (in the loosest sense of the word) planing length of any particular plane????

I think that, while it's interesting, all this talk of circles probably confuses the issue. What happens in practice is that if you keep planing the edge of a board, it gradually becomes convex (and more so at the ends). Understanding what is happening to produce that effect is probably of more value in getting the board straight IMHO.

Cheers :wink:

Paul

 

[bugbear]

So, are you saying that calculating the radius of the circle you detail gives you a maximum (in the loosest sense of the word) planing length of any particular plane????

I think that, while it's interesting, all this talk of circles probably confuses the issue.

Paul

It explains (rather clearly IMHO) why long planes and small blade projections are helpful for accurate jointing.

It's not the whole story, but it is defintely part of the story.

BugBear