is it a flycutter ?

[Michael GilliganParticipant @michaelgilligan61133]

Here’s a little mystery tool

.

.

Looks like it should fit a carpenter's brace

There’s a plain bore up the middle, but no separate clamping arrangement for anything inserted therein.

The clamping plate appears to be for a square section tool [and has been bent by abuse]

I’m sure I can make something useful from it …but I wonder what it was.

MichaelG.

[Michael GilliganParticipant @michaelgilligan61133]

[Nick WheelerParticipant @nickwheeler]

Tankcutter?

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Nicholas Wheeler 1 on 15/07/2020 14:12:38:

Tankcutter?

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I did wonder that … but I don’t think I have ever seen one with an angled slot.

[ perhaps I have just led a sheltered life ]

MichaelG.

[Nick Clarke 3Participant @nickclarke3]

Posted by Michael Gilligan on 15/07/2020 14:18:40:

I did wonder that … but I don’t think I have ever seen one with an angled slot.

[ perhaps I have just led a sheltered life ]

MichaelG.

Michael –

If you told us whether it was bus shelters or air raid shelters we might be able to guess your age

Take care,

Nick

[MichaelRParticipant @michaelr]

Joiners wood plug cutter ?

[Rob McSweeneyParticipant @robmcsweeney81205]

Possibly an early form of combined drill/countersink? The absence of a screw to lock the drillbit rather speaks against that, unless the toolbit in the slot can bear down on the drill and lock it. Or, is the bottom of the hole threaded to hold a threaded drill shank?

[Michael GilliganParticipant @michaelgilligan61133]

More photos tomorrow

… I’m on tidying-up duties this afternoon

MichaelG.

[Oven ManParticipant @ovenman]

Does the screw also lock the drillbit?

Peter

[Ady1Participant @ady1]

countersunk wood plugs?

bored up the middle for stability

Edited By Ady1 on 15/07/2020 16:40:48

[Michael GilliganParticipant @michaelgilligan61133]

Just realised that the square taper, being only single … it’s more likely to be a plumber’s tool than something to fit a carpenter’s brace.

@Peter … the screw couldn’t clamp both the plate and the drill [or pilot] effectively … BUT now that I have separated the pieces, I note that the square cutter would clamp onto a flat on a drill shank [or a pilot]

As mentioned … more photos tomorrow : but I’m now thinking it might have be for facing tap seats.

MichaelG.

[john halfpennyParticipant @johnhalfpenny52803]

A tool with plain shank and sideways peg would rotate into the slot and be retained by the plate. Clockwise rotation would keep the tool in the bit at the slot end, whilst perhaps drilling, screwing or cutting something, thus ensuring no rotational slippage of the tool in the bit. That implies much applied torque. Guess the tool?

[BazyleParticipant @bazyle]

Pipe end deburring tool.

[Bob StevensonParticipant @bobstevenson13909]

I think this might be a barbed wire cutter…is there a broad arrow mark?

[john halfpennyParticipant @johnhalfpenny52803]

How about a tool for twisting wire strands together?

[Michael GilliganParticipant @michaelgilligan61133]

It seems evident from some of the replies, that my first photo was rather ambiguous

… apologies for that

.

Hopefully this one makes things clearer

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The plain hole accepts an 8mm drill shank ; but I suspect it is nominally 5/16”

… because the tapped hole is 1/4” BSF and the body is 3/4” diameter

The ‘tooth’ is no such thing : it is simply the intersection of the square tool recess with the body

Grateful for any further suggestions

MichaelG.

[Neil WyattModerator @neilwyatt]

If I am detecting circular wear on the conical surface I think a pipe deburring tool is plausible. Noting that a plumber doesn't need to deburr a large range fo pipe sizes.

Neil

[ZanParticipant @zan]

My dad had one for cutting holes in aluminium home built amateur radio stuff in the 60’s. It’s used in a carpenters brace. A drill is mounted in the central hole which acted as a ilot. The cutter was bent at an angle so it was vertical at the end and sharpend ..wjhen pushed down the angled slot the diameter of the hole can be adjusted And clamped with the screw. I’d completely forgotten about it before this post!

[NIALL HORNParticipant @niallhorn50878]

Plumber's tank cutter from the days of galvanised water tanks?

[Author]

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