Another Mystery tool

Gents and Ladies,

yet another item that bamboozled me until I cracked its secret.

Quite an interesting item for those who have never seen one, i.e. me before I bought this.

In the central image the items inside the centre hole are hardened steel rollers that float freely. No manner of adjustment.

Looks similar to a floating reamer holder for chambering rifle barrels.

Was going to say thread roller, might be time to replace those screws though

Tapping box... as the arbour rotates clockwise the rollers ? inside rotate / cam effect, to grip the tap & release when rotated anti clockwise....? sized for 4.5 to 8 mm taps

​George.

Not seen one before but I'd guess it to be either an "external" tailstock "centre" or a planisher.

Rik

Still in business

**LINK**

A roller clutch chuck to hold rod for threading?

Or further to Neil's suggestion, an 'automatic' self tightening drilling chuck?

Tim

It's a quick action drill chuck.

Is it a stud driver? You can buy them with three rollers that are in wedge shaped slots so that they tighten on the stud as the stud is being driven.

Martin C

yes, I was pretty much right but over-thought it, it's just a quick drill chuck.

Success, yes its a quick drill chuck.

Tapping would be a problem as you would not be able to withdraw the tap.

It works very much like a stud removal tool but is far too well made for that job.

Once in the quill drills can be fitted and removed without stopping the spindle and no pesky chuck key to find in the swarf!

well done Neil, Tim and David for identifying it.

I cheated on my ID, there's one for sale on eBay.de

Not sure about this 'not stopping the drill' aspect. I have a keyless chuck that you push the body one way to open and the other to close but it has to be spinning to work. That means you have to hold the drill to do up and it will suddenly snatch and spin. Seems a daft idea.

yes I appreciate my chuck was intended for production, and being 1MT only small drills however it's the bit about holding the drill bit in your hand that I find problematic. If you did a change every minute in a working day on the line what would happen to your fingers.

How exactly does it work? I'm struggling with the whole idea!

Jim