Tenon/ dovetail blade design

[carlb40]

While searching for the above saws, i often come across tapered blade designs like this one.

http://www.ebay.co.uk/itm/Back-Saw-Robt ... 3f22933e2e

But also the standard parallel type. So just wondering if it is an intentional design? If so why? Is there a reason behind having the front of the blade not as deep as the rear? Or is purely where it has bee resharpened out of parallel?

 

[MIGNAL]

I think that there are a couple of theories. It's caused by jointing and 'favouring' the toe part of the blade when sharpening or the blade has sunk further into the brass back.
Nice saw but it has been poorly sharpened, uneven teeth.

 

[bugbear]

IIRC there's a fairly massive thread on this on backsaw.net (yes, a forum dedicated to one tool).

Edit (google);

http://www.backsaw.net/index.php?option ... &Itemid=77

Reasoning, evidence, the works.

BugBear

 

[Dangermouse]

After seeing a lot of both types over the years, some were made like it and others if very old, have worn like it through sharpening and jointing. Both types do the job fine.

 

[carlb40]

Cheers guys.
BB i had come across backsaw. net before while researching dandle designs

I actually prefer the tapered look, it adds character

 

[Klaus Kretschmar]

To me it's pretty clear, that canted blades on Dovetail saws have been part of the former tool design. The (nearly never used) saw from the Seaton tool chest is proof enough for me.

Pedder and I did several attempts with canted blades on DT saws. Aside of the visual advantage we couldn't find another one. If you want to make a canted DT saw the right way, you are forced to adapt the handle design by reducing the hang angle. Otherwise the hang angle might be too high by decreasing the performance of the tool.

Klaus