Thread: Burdekin Plum backsaw.

Originally Posted by Sawdust Maker

nice handle

looking forward to see the saw

Thanks Nick.

Originally Posted by planemaker

Your heading towards perfect score on guessing Dale. Kudos. Now if you wanted to determine the hang angle of the handle to the saw plate, Isaac illustrates the procedure very well on his website.

Concerning hang angles and saw handles | Blackburn Tools

Stewie;

Bit hard to estimate but I'm going to go with 23 Deg Hang angle. Using the inside curve of the handle as the base line axis

Originally Posted by DSEL74

Bit hard to estimate but I'm going to go with 23 Deg Hang angle. Using the inside curve of the handle as the base line axis

Originally Posted by planemaker

I said it wasn't easy to estimate…….Trying to be a bit more scientific about it, some place around 33-38Deg? The hump in the rear of the handle makes it hard as it is different to the inside curve. If you drew the line down the midle of the tote you want me to work to I might have a better chance.
Hang.jpg



Wait a minute…….did you just give me homework???

C'mon Stewie, you left me hanging!!

Originally Posted by DSEL74

C'mon Stewie, you left me hanging!!

I would guess that he is referencing the way I measure the hang angle, which is by drawing a line through the back of the handle, which is where the palm of your hand applies the force to the saw.

saw-hangs-ex.jpg


So far as I know, there is no universally accepted definition of hang angle, so I more or less made up a lot of this as I went along. It made sense to me when I wrote it; we'll see if it works for others.

Originally Posted by Isaac S

I would guess that he is referencing the way I measure the hang angle, which is by drawing a line through the back of the handle, which is where the palm of your hand applies the force to the saw.

saw-hangs-ex.jpg


So far as I know, there is no universally accepted definition of hang angle, so I more or less made up a lot of this as I went along. It made sense to me when I wrote it; we'll see if it works for others.

Hi Isaac. Your understanding on how the hang angle is measured is no different to mine. The only difference being I reference the line through the center of the grip, and not from the back. There would still be little variation between the 2 resulting measurements. IMO

Stewie;

I thought it was a trick question!
Won't the hang angle also be impacted by the cant of the blade?
Dale has estimated it from the spine line as that is all he has in the photo of the handle.
A couple of degrees of cant will add a couple more to the hang angle - and it hasn't been built yet!

Originally Posted by hiroller

Won't the hang angle also be impacted by the cant of the blade?
Dale has estimated it from the spine line as that is all he has in the photo of the handle.
A couple of degrees of cant will add a couple more to the hang angle - and it hasn't been built yet!

The hang angle that really matters is the one between the handle and the toothline, since that is where the cutting happens.


canted-hangs.jpg


In the picture above, I call the angle between the handle and the teeth the primary hang angle, and the angle between the handle and the spine the secondary hang angle. These are the same when the saw has no cant.

Take that uncanted saw, and fix the blade in relation to the handle. To add cant, you can either remove material from the bottom or top of the blade. The former method changes the primary hang angle (the drawing below shows this); the latter changes the secondary hang angle.


canted-uncanted.jpg



In the end, the effects are usually pretty small (but it looks good, and discussion of it is suitable filler material for a blog entry).

Yep, yep, yep. Just my humble opinion. But I concur with Issac. I measure all my hang angles the same way. Always from the tooth line. The spine is of no consequence, other than visual effect, and varies according to cant. Even then it is only a few degrees.

Originally Posted by Ron Bontz

Yep, yep, yep. Just my humble opinion. But I concur with Issac. I measure all my hang angles the same way. Always from the tooth line. The spine is of no consequence, other than visual effect, and varies according to cant. Even then it is only a few degrees.

By jimminy cricket. Its great to see your comments on this forum Ron. Now we have the full contingent of modern saw making knowledge contributing to this forum.

Stewie;

Originally Posted by Ron Bontz

Yep, yep, yep. Just my humble opinion. But I concur with Issac. I measure all my hang angles the same way. Always from the tooth line. The spine is of no consequence, other than visual effect, and varies according to cant. Even then it is only a few degrees.

Ron, Can we share your Pink Ivory saws here with the forum???

Originally Posted by DSEL74

Ron, Can we share your Pink Ivory saws here with the forum???

Looking at the timing of Rons Pink Ivory post, and your request, Ron was 3 hours ahead of you Dale.

Stewie;

Originally Posted by Isaac S

So far as I know, there is no universally accepted definition of hang angle, so I more or less made up a lot of this as I went along. It made sense to me when I wrote it; we'll see if it works for others.

Hi Isaac,

I agree with your definition of hang angle, there was a study done by Bob Brode, years ago where he measured hang angles and published the results on his website, the web site has long since vanished into the mists of time, and I can't find my copy of that survey he did.... I'll keep looking and maybe it will turn up.

In addition to the angle of the grip relative to the tooth line, there is another variable, and that is the height of the center of the grip from the tooth line. IanW likes his saws to have the grip center close to the tooth line, and this arrangement also interacts with the height of the work. With the work higher, the lower hang angles work best.

As a general rule of thumb, the hang angle gets lower as the length of the saw increases..

Anyone got a copy of that Bob Brode hang angle survey?

Regards
Ray