Shooting Board Aussy Style

[woodbloke]

Waka - very tasty...brass knobs and a medal, up market or what? :lol: - Rob

 

[Mr Ed]

Even after reading the thread referred to I'm still not totally convinced that the ramp doesn't produce a skew effect though.

The last time we went round this debate I was initially sure that there was a skewing action, but Steves diagrams convinced me otherwise. What is it you're still not sure about?

As I said in my original comments, it's not to say that there aren't other benefits of a ramped board...

Cheers, Ed

 

[TheTiddles]

oookay,

Just humour me for a minute, whilst the pretty pictures are very convincing... If I were the piece of wood (insert joke here) then I would see on a normal shooting board, a plane approaching straight on. On a ramped shooting board the plane would appear to be sliding horizontally slightly as it approached, thereby imparting a skewing cut???

I think it's not a question of angles but of relative motions? Unless I'm missunderstanding the meaning of a skewed cut, one that has a slicing motion as well as the main direction of the cut, like slicing bread?

Aidan

 

[Mr Ed]

Well I don't claim to be an expert on this, but I think the gist of it is that you can tip the workpiece to any angle you like, but the plane is still approaching at 90 degrees and therefore not skewing. What you would have to do is tip the plane onto an angle (imagine it sat on a wedge) and then slide that forwards to produce a skew.

That may, or may not, help.

Cheers, Ed

 

[newt]

I agree with Ed, this is not a skew cut. You would get the same effect if you tilted the workpiece by putting packing under the front (nearest to you) edge. It just means that instead of the plane iron meeting the workpiece at right angles to its vertical front edge, cut starts at a corner and then it continues just the same as a flat SB. This may make the start of the cut easier as it does not hit the full depth of the workpiece at the start of the cut. A skewed iron will aways be cutting at an angle throughout the whole cut.

 

[Jake]

Even after reading the thread referred to I'm still not totally convinced that the ramp doesn't produce a skew effect though.

The last time we went round this debate I was initially sure that there was a skewing action, but Steves diagrams convinced me otherwise. What is it you're still not sure about?d

And ditto

 

[Tom K]

I think this page is helpful

http://www3.telus.net/BrentBeach/Sharpen/jig faq 03.html#skew

Cant pretend to understand the math
I think what most of us unbeleivers struggle with is the notion of being told plane to wood at 45 deg isnt the same as wood to plane at 45 deg.

I still think the end result is similar. However I accept that the definition of skew planing is related to the direction of motion in relation to blade angle.

Regards Tom

 

[TheTiddles]

I agree with Ed, this is not a skew cut. You would get the same effect if you tilted the workpiece by putting packing under the front (nearest to you) edge

There I think you are wrong, if the wood were a bundle of straws, each one representing a fibre, taking one fibre... The blade cuts into the fibre, but as it progresses the blade is also moving down the ramp so moving horizontally perpendicular to the direction of travel of the blade... and I've just realized I'm wrong, sorry

The above image is rubbish as the blade isn't vertical it's angled down parallel to the ramp, the only way to get what I was thinking off was to mount the plane on a carriage that moved down as well as forward yet kept the plane level. In fact, to get what I would call a skewing cut you have to keep the plane straight but move it horizontally as well as forward, like from corner to corner of a rectangle, but with the plane parallel to the sides, anyway, I'm tired...

Aidan

 

[Chris Knight]

Waka - very tasty...brass knobs and a medal, up market or what? :lol: - Rob

Brass knobs maybe but what about the bells?

 

[woodbloke]

Waka - very tasty...brass knobs and a medal, up market or what? :lol: - Rob

Brass knobs maybe but what about the bells?

Chris - not forgetting the whistles either - Rob

 

[Benchwayze]

If you take the plane into the stock on this ramped s/b, then in effect the plane is being skewed.

If there is a debate here, then clamp in a piece of stock, tip the shooting board on its side and put the plane in position and look down on it. Plane would be at a slight angle to the endgrain.

I think that's what I've always known as a skew-cut. I could be wrong of course.


:?

 

[Jake]

It's been done a few times this one, and it's a bit of a mental trap. Steve M did a brilliant explanation of why it isn't a skew cut here: https://www.ukworkshop.co.uk/forums/view ... mp&start=0

 

[Benchwayze]

So if I use a LN R/H skew plane on a normal shooting board, this wouldn't be a skew-cut then?
:?

 

[Jake]

That would be!

(i.e. it is like the second set of examples, but the blade is already skewed in the plane body, rather than having to skew the whole plane to skew the blade)

 

[Benchwayze]

But why Jake? :wink:
I'll rephrase...
Why is it a skew-cut, and what's the advantage? :wink: