Shooting boards - Ramped vs skew

[Tom K]

provided the blade passes through the grain at any angle below 90 it surely must be skewed by definition :? Your logic seems to dictate that the angles of cut the blade produces will be different from one side to the other?

But by skewing the plane the actual pitch of the blade is altered, the more it is skewed the lower the effective pitch

Ah this is why your interpretation didn't sit well with me, the idea of skewing the plane is to lower the effective pitch of the blade as presented to the wood using the ramped shooting board lowers the effective pitch of the blade presented to the wood so similar result produced for different circumstances I guess

Regards Tom

 

[Steve Maskery]

No Tom, the whole point is that using a ramp does not change the effective pitch at all. It may have other benefits, but lowering the effective pitch, by skewing or otherwise, isn't one of them.

Use a dowel as the workpiece and you'll see what I mean.

Regards
Steve

 

[bugbear]

No Tom, the whole point is that using a ramp does not change the effective pitch at all. It may have other benefits, but lowering the effective pitch, by skewing or otherwise, isn't one of them.

The best demonstration, which your pictures nicely illustrate, is the difference between a 90 degree RAMP and a 90 degree SKEW.

By making the angle bigger, the difference becomes clear.

BugBear

 

[Tom K]

Hi Bugbear,

The best demonstration, which your pictures nicely illustrate, is the difference between a 90 degree RAMP and a 90 degree SKEW.

Surely there is no such thing as either of these :lol:

Regards Tom

 

[bugbear]

Hi Bugbear,

The best demonstration, which your pictures nicely illustrate, is the difference between a 90 degree RAMP and a 90 degree SKEW.

Surely there is no such thing as either of these :lol:

Regards Tom

I'm sure sure wether you're joking or not; on the off chance you're serious, consider 80 degrees, which isn't quite so clear, but is more credible.

BugBear

 

[dunbarhamlin]

To demonstrate it another way, the running board of a shooting board can be thought of as a batten applied to the stock against which the plane is run. Whatever the batten angle, the shaving will always be full blade width (i.e. not skewed.)

Running a circular saw against a batten positioned at different angles on the stock could be quite interesting, but for this immutable geometric principle

Cheers
Steve