Shooting board comparison for Bugbear

[Derek Cohen (Perth Oz)]

Hi BB

I was about to use the #51/52 today when I had this idea to compare it with my ramped shooting board, both using the #51. I thought that this would throw some light on the effect of a ramp in shooting end grain.

One of the observations I have posted before, in comparing a ramped with a flat shooting board, was that the ramped board appeared to reduced the impact shock of the plane. The slight skew imparted by the ramped board is too low to be compared with the skewed blade of a #51 shooting board plane, but it was enough to enable the blade to enter the wood with a slight slicing action, and that this was significant.

You suggested that I try the #51 on the ramped board. I thought about this today. Would the skew of the #51 neutralise the influence of the ramp?

First I compared the ramped board with the #52 Chute Board, both using the #51, on Jarrah end grain. Here is the ramped board ...

A close up of the shavings ...

Then I repeated this on the #52 ...

I also used Radiata Pine ('orrible stuff) on both boards ...

I went back-and-forth several times.

My impression was that the #51 on the ramped board felt smoother than the #51 on the #52 chute board. Both boards produced excellent surfaces. The difference was simply that the ramped board jarred less than the flat #52.

Regards from Perth

Derek

 

[bugbear]

I'm surprised that the ramped board had any additional effect, given the existing skew on the #51.

I'll think about it some more.

BugBear

 

[Toolemera]

Derek

The look of the shavings from the two trials is interesting. On the ramped board, the shavings look almost polished. On the flat board, the shavings look rough, even with the skewed blade. Is this a trick of the photo or true? If true, it has me wondering about the effect of a dramatic skewed angle of attack for shooting, not to mention planing, recalcitrant grain.

Gary

 

[Derek Cohen (Perth Oz)]

Hi Gary

In spite of the ramped board cutting more easily (using the #51), both set ups produced identical shavings and surfaces.

Regard from Perth

Derek

 

[Toolemera]

Hi Gary

In spite of the ramped board cutting more easily (using the #51), both set ups produced identical shavings and surfaces.

Regard from Perth

Derek

So much for the Ramped Shoot Board theory of relativity. I guess the skew makes the process easier but the end result is the same.

Gary

 

[Derek Cohen (Perth Oz)]

Hi Gary

Here is what I end up with ..

1. A ramped shooting board is smoother than a flat shooting board.
2. A skewed cut (#51) is smoother than a straight blade (LAJ).
3. This is additive: a ramped board plus skewed blade is the best of the lot!

Regards from Perth

Derek

 

[bugbear]

Hi Gary

In spite of the ramped board cutting more easily (using the #51), both set ups produced identical shavings and surfaces.

Regard from Perth

Derek

So much for the Ramped Shoot Board theory of relativity. I guess the skew makes the process easier but the end result is the same.

Gary

I can get hold of a ramped board a LOT easier than a skewed bench plane!

BugBear

 

[Toolemera]

Paul... I believe it has to do with distance from the equator. At the equator, you are planing straight on to the grain. The farther you go north or south, the greater the angle of skew. By the time you get to True North or True South, you are unable to plane at all. Or so I am told.

Gary

 

[Philly]

Paul... I believe it has to do with distance from the equator. At the equator, you are planing straight on to the grain. The farther you go north or south, the greater the angle of skew. By the time you get to True North or True South, you are unable to plane at all. Or so I am told.

Gary

LOL :lol:

Makes so much sense, Gary.
Philly

 

[Vann]

Paul... I believe it has to do with distance from the equator. At the equator, you are planing straight on to the grain. The farther you go north or south, the greater the angle of skew. By the time you get to True North or True South, you are unable to plane at all. Or so I am told.

That's why Derek's No.51/52 combo gave inferior results - he's got a northern hemisphere skew. For the southern hemisphere you need the skew to go the other way.

Cheers, Vann. :lol: :lol: