Uses for a 52.5 degree chamfer cutter

jim_hanna · 11 Jun 2017

Just out of curiosity I was wondering what application calls (or called) for a precise 52.5 degree chamfer.

The reason I ask is that when I bought my 55 it came with a couple of extra bits. As well as the 40 and 41 Stanley blades which cut 45 degree chamfers it also had a user made blade which cuts a 52.5 degree chamfer. Who ever made it probably also made the additional depth stop which shows a fair degree of metalworking skill.
The extra larger depth stop is on the left, the standard 55 depth stop on the right. The maker matched the thread used on the original.

The plane was clearly a user, lots of the cutters were sharpened, including the extra chamfer blade.

Obviously someone was cutting lots of 52.5 degrees chamfers if they went to the trouble to make a blade for the purpose.
My Trend catalogue doesn't show any modern router chamfer bits at this angle.

Just wondering if anyone on here could throw any light on how this cutter might have been used?

Thanks Jim

woodbrains · 11 Jun 2017

Hello,

The cutters might be ground at 52.5 but once bedded in the plane would create a different angle on the work, I'm guessing 45 degrees!

Mike.

jim_hanna · 11 Jun 2017

woodbrains":1s4ew98b said:
The cutters might be ground at 52.5 but once bedded in the plane would create a different angle on the work, I'm guessing 45 degrees!

The two stock Stanley cutters are ground at approx 37.5 which when bedded at 50 degrees in the plane gives a 45 degree chamfer.

The home made cutter I'm asking about is ground at 45 which gives the 52.5 degree chamfer when bedded at 50 degrees in the plane.

I'm sure anyone with the skills to make and thread the additional depth stop would be well aware of the change in angle when the cutter is bedded in the plane so I think the 52.5 chamfer is intended, but for what is the question?

woodbrains · 11 Jun 2017

jim_hanna":165xxdjh said:
woodbrains":165xxdjh said:

The cutters might be ground at 52.5 but once bedded in the plane would create a different angle on the work, I'm guessing 45 degrees!

Click to expand...

The two stock Stanley cutters are ground at approx 37.5 which when bedded at 50 degrees in the plane gives a 45 degree chamfer.

The home made cutter I'm asking about is ground at 45 which gives the 52.5 degree chamfer when bedded at 50 degrees in the plane.

I'm sure anyone with the skills to make and thread the additional depth stop would be well aware of the change in angle when the cutter is bedded in the plane so I think the 52.5 chamfer is intended, but for what is the question?

Hello,

Sorry, I missread the cutters actually cut 52.5.

Might just have been a custom job only the original user was privy to. Sometimes internal cornice angles, for example are not 45/45 degrees, but 52/38 so the cornice fits into the internal corner taller and narrower. Perhaps the cutters were for chamfering the backs of cornice moulding. (Does that make sense?)

Mike.

jim_hanna · 12 Jun 2017

woodbrains":bptbbt5b said:
Might just have been a custom job only the original user was privy to. Sometimes internal cornice angles, for example are not 45/45 degrees, but 52/38 so the cornice fits into the internal corner taller and narrower. Perhaps the cutters were for chamfering the backs of cornice moulding. (Does that make sense?)

Mike.

Nobody has come back to say “Yes, we cut 52.5 angles all the time for.. “ so I think you’re right – it must have been a custom joint or moulding step by the one user who made a specialised tool to assist.
Thanks
Jim