Right angle coring, is that even a thing?

[hughie]

As I do more closed vessels than anything else, this brings on different requirements, mods etc. This one is not new I came across it several years ago and but by the look of it, it never caught on.
Image 4828 is the collection with additional tips, handles are hollow allowing for length adjustment.
Image 4833 shows the heads along with the depth stop
image 4830 a close-up of the different hollowing heads
image 4834 is the actual business end, a simple piece of HSS steel 3mm thick shaped, etc with a 4" grinder cut-off wheel, silver soldered to the shaft

 

[Kevin Jenness]

So you cut a deep kerf that will accept the sawtooth cutter, then pivot it to undercut the core? Have you ever used it? Seems like it could be, let's say, interesting

 

[hughie]

yes just recently

 

[DON FRANK]

I am still on my first cup of coffee so the brain is working a little slow this morning. I'm trying to wrap my head around how you can use the long hook tool in photo 4834 to cut the bottom. How wide of kerf are you creating to make this possible. The length of the saw blade is so long I'm trying to picture how it could be inserted without a horrific catch.

 

[hughie]

I am still on my first cup of coffee so the brain is working a little slow this morning. I'm trying to wrap my head around how you can use the long hook tool in photo 4834 to cut the bottom. How wide of kerf are you creating to make this possible. The length of the saw blade is so long I'm trying to picture how it could be inserted without a horrific catch.

Frank, I cut a kerf around 9/16" and make sure the cutter will easily slide down the kerf when the bowl is stationary rotate the lathe by hand to check the clearance, and set the toolpost so the shaft is on centre, ideally in an Irons gate. At this point, I start the lathe up at slow speed of 2-300rpm, roll the shaft in the irons gate anti-clockwise into the wood. The length of the cutter determines the dia of the core

 

[Mark Jundanian]

I know you were successful @hughie , but I still gotta say: "Yikes".

 

[Irfan Sehic]

You should make a video of this in action.

 

[Michael Nathal]

I remember a hand held bowl coring tool for sale about 15 years ago, I think it was called a "Bowl Saw" and looked similar to what you have. A YT video that I can't find anymore showed it being used as you described.

 

[Odie]

I remember a hand held bowl coring tool for sale about 15 years ago, I think it was called a "Bowl Saw" and looked similar to what you have. A YT video that I can't find anymore showed it being used as you described.

I remember that too.....but, it was the inventor who came on the forum to show his new idea.

I'd guess it was more than 15 years ago.

It didn't impress very many other turners.....and, I can see why.

Looks like a catastrophic event about to happen!

=o=

 

[John K Jordan]

I remember a hand held bowl coring tool for sale about 15 years ago, I think it was called a "Bowl Saw" and looked similar to what you have. A YT video that I can't find anymore showed it being used as you described.

Yes, it was a Bowl Saw. I have one. There was some discussion about this in the big what’s on your lathe thread:

Post in thread 'What’s on your lathe?'

Mar 19, 2025

I have one that looks similar but is not that beefy, I can't remember who made it.

I think what I got was called “Bowlsaw”. But it’s been a long time and my memory is not reliable!

Some years back a fellow was making them and part of his plan was to send them out to certain people for feedback.
He sent me one to evaluate, perhaps because I was active on several forums and a moderator on one. I tried it and I found, as I mentioned, it worked fine but for me it had some limitations, mostly diameter of the core. However, for certain sizes and bowl shapes it could be a...

• John K Jordan

• 

Scroll up a bit there for some more info.
As I mentioned there, it worked: cut a deep, wide groove, insert the tool, rotate to saw.
It did not feel unsafe but was quite limited in use. Would benefit from a variety of blade sizes and arcs.
IIRC it had a custom made hardened steel saw blade.

If I can find the one I have, anyone who wants it can have it. Or trade for small wooturned trinket for my celebrity collection.

JKJ

 

[hughie]

Yes, it was a Bowl Saw. I have one. There was some discussion about this in the big what’s on your lathe thread:

Post in thread 'What’s on your lathe?'

Mar 19, 2025

I have one that looks similar but is not that beefy, I can't remember who made it.

I think what I got was called “Bowlsaw”. But it’s been a long time and my memory is not reliable!

Some years back a fellow was making them and part of his plan was to send them out to certain people for feedback.
He sent me one to evaluate, perhaps because I was active on several forums and a moderator on one. I tried it and I found, as I mentioned, it worked fine but for me it had some limitations, mostly diameter of the core. However, for certain sizes and bowl shapes it could be a...

• John K Jordan

• 

Scroll up a bit there for some more info.
As I mentioned there, it worked: cut a deep, wide groove, insert the tool, rotate to saw.
It did not feel unsafe but was quite limited in use. Would benefit from a variety of blade sizes and arcs.
IIRC it had a custom made hardened steel saw blade.

If I can find the one I have, anyone who wants it can have it. Or trade for small wooturned trinket for my celebrity collection.

JKJ

Found them easy to make, cut mine from a industrial hacksaw blade and silver solder it onto some shafting I had. But as you say it can only cut one dia per tool.

 

[Java DeLaura]

Interesting, I'd like to see it in action.

 

[hughie]

Interesting, I'd like to see it in action.

Not a lot to see as its buried deep in the piece you're coring

 

[Jon Rista]

That is pretty neat. I have a number of larger blanks I've held off on turning, as it would mean wasting a heck of a lot of beautiful wood. I mean, I get that such is the cost of turning beautiful wood a lot of the time. Still...something like this could save a decent amount. Maybe enough for a box, small vase, or something like that. Deending on how tall the original blank was, maybe a couple of things.

 

[hughie]

That is pretty neat. I have a number of larger blanks I've held off on turning, as it would mean wasting a heck of a lot of beautiful wood. I mean, I get that such is the cost of turning beautiful wood a lot of the time. Still...something like this could save a decent amount. Maybe enough for a box, small vase, or something like that. Deending on how tall the original blank was, maybe a couple of things.

very easy to make

 

[Jon Rista]

very easy to make

Did you weld the toothed arm onto the bar? Or is solder good enough?

 

[hughie]

Did you weld the toothed arm onto the bar? Or is solder good enough?

Jon I used silver solder, conventional plumbing solder wont be strong enough. As to silver solder, the one I am using is medium strength nothing fancy. The low temp silver solder might be easy to apply but I would be concerned about the strength. I use a gas mixture what is known here as mapp gas or it equivalent.
BLUEFIRE Modern MAPP is a modern substitute to the traditionally known MAPP fuel gas, which was discontinued since 2008. Currently, our product is the only real original MAPP gas substitute available in the North American Market.

 

[John K Jordan]

…MAPP fuel gas, which was discontinued since 2008

Do you know why MAPP was discontinued? I remember it happening but never heard why.

I use it on occasion, glad I bought extra when available. (Unless the cylinders are prone to get unstable on the shelf and randomly explode some day!) Are they a chemical health hazard?
I still have oxy-acetylene though and if making something like that little saw, I’d probably TIG weld.

 

[Brian Gustin]

Do you know why MAPP was discontinued? I remember it happening but never heard why.

I use it on occasion, glad I bought extra when available. (Unless the cylinders are prone to get unstable on the shelf and randomly explode some day!) Are they a chemical health hazard?
I still have oxy-acetylene though and if making something like that little saw, I’d probably TIG weld.

I asked Microsoft Copilot- Response is:

MAPP gas was discontinued in 2008 because the only remaining North American manufacturer shut down its production facility. The decision was influenced by a factory fire, declining demand, and the high cost of rebuilding the plant. Over time, alternatives like oxy-acetylene and oxy-propane became more popular, making MAPP gas less economically viable.


Although genuine MAPP gas is no longer produced, there are modern substitutes labeled as MAP-PRO, MAP-X, or MAP-Plus, which primarily contain propylene and propane.

 

[hughie]

Do you know why MAPP was discontinued? I remember it happening but never heard why.

I use it on occasion, glad I bought extra when available. (Unless the cylinders are prone to get unstable on the shelf and randomly explode some day!) Are they a chemical health hazard?
I still have oxy-acetylene though and if making something like that little saw, I’d probably TIG weld.

no I never found out why, loved the amount of heat it put out