Traditional tanged spokeshaves.

[swagman]

Does anyone else work a mild convex camber on their flat bottom spoke-shave blades.

Stewie;

 

[xy mosian]

Hi swagman,
I have a number of oldish tanged spokeshaves, the most recent of them being a Kangaroo brand from about teh 1970's. Without examining all of them I would guess that most have a curve built in to the blade. This of course means that the 'mild convex camber' can be honed easily on a flat stone.
By the way I find it easier to sharpen by holding both tangs in one hand, thumb and first finger, and running the blade along the 'side to side', or tang to tang.

xy

 

[swagman]

xy; I took some measurements this morning.

The length of cutting edge for this spokeshave blade is 3 inches.

After a fine set has been applied to the spokeshave blade, the length of exposed cutting area is reduced down to 2 1/4 inches.

The depth of cut at the mid point of the exposed cutting area is about 0.2mm. From each side of that mid point, the depth of cut reduces as a result of the applied convex cambering.

The height of convex cambering was measured at 0.8mm with a steel rule.

I also checked the flat of the blades surface near the cutting edge, and it has a slight convex curve of 0.5mm.

As you will note within the following 2 photo's, I have more than 1 tanged spokeshave.

regards Stewie;

 

[swagman]

imo the beauty of applying a convex cutting edge to a traditional spokeshave lies in the ability to feather the depth of shaving without having to continually adjust the blades set.

Stewie;

 

[swagman]

I had a quick search in the workshop for the left over nos tanged spokeshave blades. The one I wanted to find has a massive 4 inch long cutting edge x 3/4 " width. I did come across this much smaller size nos blade, that has an 1 1/2" length of blade.

Stewie;