Is this a dog?

[AJAXParticipant @ajax]

I'm trying to figure out what this thing is. It's on a Morse taper (obviously) and the two outermost points have a spacing that lacks adjustment. I'm not sure what it could be used for other than maybe a drive dog of some sort. Perhaps it was made for a specific task? If anyone knows, I'd be interested to learn something new.

[AJAXParticipant @ajax]

[Chris GunnParticipant @chrisgunn36534]

Could it be a trepanning tool?

[AJAXParticipant @ajax]

Posted by Chris Gunn on 29/01/2022 19:47:16:

Could it be a trepanning tool?

I wondered that at first, but it seems to lack any useful adjustment. And those two points are not ground for cutting.

[Clive FosterParticipant @clivefoster55965]

Given the different spacing of the two "points" from the centre I'd guess its for either:-

marking out two concentric rings as a guide to further machining

or

cutting a large diameter but narrow washer from thin sheet material

The points present don't look like cutting edges so making seems more likely.

But its the sort of thing that could be a modification of a no longer needed device to do another job.

Clive

[DalboyParticipant @dalboy]

I have seen something similar but the two outer points do not have the sides ground away and also they are on the same plane not offset like your one.

The one I had seen was designed for wood turning and gave a positive grip as a drive centre

[MikeKParticipant @mikek40713]

Posted by AJAX on 29/01/2022 19:49:19:

Posted by Chris Gunn on 29/01/2022 19:47:16:

Could it be a trepanning tool?

I wondered that at first, but it seems to lack any useful adjustment. And those two points are not ground for cutting.

Remove one of the "cutters" so that the cross bar can adjusted farther out? As mentioned, the "cutters" don't have any cutting geometry, though.

[Martin KyteParticipant @martinkyte99762]

Yes, I'd vote for woodturning driving dog too.

regards Martin

[Ady1Participant @ady1]

Yup. Wood.

[HopperParticipant @hopper]

Whistle and see if its ears prick up.

[Mike HurleyParticipant @mikehurley60381]

I agree with Clive. Don't think they are woodturning dog – as he says they are not equidistant from the centre and appear to be adjustable – all wood dogs I've ever used are just on piece. These would appear more suitable for sticking in the tailstock and marking out rings or washers to be cut from stock held in the chuck etc.

regards Mike

[Tony Pratt 1Participant @tonypratt1]

Don't think it's a woodturning dog but as to what it is I'm not sure, the outer points are not very pointy or shaped for cutting.

Tony

[Mark RandParticipant @markrand96270]

It's also possible that it was used as an offset centre for taper turning.

[Tony Pratt 1Participant @tonypratt1]

Posted by Mark Rand on 30/01/2022 10:24:33:

It's also possible that it was used as an offset centre for taper turning.

How would that work? But maybe.

Tony

[not done it yetParticipant @notdoneityet]

Posted by Hopper on 30/01/2022 09:42:10:

Whistle and see if its ears prick up.

My first thought was perhaps, a close relative of K-9.🙂

[Neil WyattModerator @neilwyatt]

It's used in the headstock, and is a device for removing the ties of incautious machinists.

Neil

[Nicholas FarrParticipant @nicholasfarr14254]

Hi Neil, and one might very quickly see the point, close up!

Regards Nick.

[John ReeseParticipant @johnreese12848]

I think it i a spur center for wood turning. Used in the headstock.

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