Anyone know what this is? (Lathe part)

[Steve BowerParticipant @stevebower42241]

I've found this in a box. Any clues what it is? Has a large morse taper at one end, looks like with a 3/8" internal thread (all sizes approx), A 1" external thread, a 3/4" shaft, and a centre drilling at the other end. Overall length 15"

Note, I have a Super 7, so anything incompatible isn't much use

Edited By Steve Bower on 04/01/2018 23:56:53

[Steve BowerParticipant @stevebower42241]

[I.M. OUTAHEREParticipant @i-m-outahere]

Looks like a test bar , it is fitted to the morse taper in the lathe spindle to check runout and parallelism with the lathe bed the thread is for a backing out nut so you can get it out of the spindle without having to use a piece of bar and a hammer from the back of the spindle.

Ian

Edited By XD 351 on 05/01/2018 08:53:06

[JourneymanParticipant @journeyman]

Arbour from a small horizontal mill?

John

[Martin KyteParticipant @martinkyte99762]

Is the parallel part actually parallel?

If it has a slight taper it could be a tapered mandrel with bits missing.

If so, the thread up the end would be for a draw bar. (Which you wouldn't need if it was a test bar, there would be a female centre instead)

Material with a bored hole would be tapped onto the taper, the out side machined and a threaded collar on the external threaded section used to eject the work after machining.

regards Martin

[Martin KyteParticipant @martinkyte99762]

In fact similar to these.

**LINK**

regards Martin

[RobinParticipant @robin]

Expanding mandrels? I am suddenly 60 quid lighter

[Howard LewisParticipant @howardlewis46836]

If it were an Arbor for a Horizontal Mill, surely it would have a thread on the outer end, where the centre is? (To clamp the sleeves and the cutter against a flange at the MT end).

The fine thread at the MT end is a puzzle, but if it can proved to be parallel, and not bent, I would use it as a test bar, to check / reset alignment of the Tailstock, or to set over the Tailstock for turning a taper. (Hopefully, the Headstock will be aligned correctly, but it could be used to check / reset this also)

Howard

[Steve BowerParticipant @stevebower42241]

Its a big ol' taper – it it compatible with Super 7 Headstock, & how how I remove the existing?

Cheers

[John HaineParticipant @johnhaine32865]

Pardon? Your S7 is presumably MT2 unless a later big more model when it's MT4. If you could measure the larger end of the taper it might be possible to identify it. How do you remove the existing what?

[John MCParticipant @johnmc39344]

The photo I have hopefully uploaded is similar to the OP's "mandrel". I wonder if it cold be of a similar purpose? This one is the spindle that held the hob on a Dowding gear hobbing machine. It has a 4 morse taper, the thread adjacent to the taper is for extraction, I think. The other end has a center hole for support and a thread arrangement for clamping the hob. It has been some time since I acquired the spindle so the detail may be a little "off". I had three of them, various lengths, useful for the 4MT.

John

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