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Another Mystery tool

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Tractor man11/03/2018 17:53:51
405 forum posts
195 photos

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.




Tractor man11/03/2018 18:02:18
405 forum posts
195 photos

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

Mike E.11/03/2018 18:05:33
158 forum posts
3 photos

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

Rainbows11/03/2018 18:06:40
586 forum posts
173 photos

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

mechman4811/03/2018 18:30:49
1799 forum posts
328 photos

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


Rik Shaw11/03/2018 18:33:44
1055 forum posts
296 photos

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


Speedy Builder511/03/2018 18:53:45
1379 forum posts
95 photos

Still in business


Neil Wyatt11/03/2018 20:00:46
12817 forum posts
562 photos
67 articles

A roller clutch chuck to hold rod for threading?

Tim Stevens11/03/2018 21:43:19
783 forum posts

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


David Standing 111/03/2018 22:26:03
900 forum posts
40 photos

It's a quick action drill chuck.

Martin Connelly12/03/2018 11:09:06
613 forum posts
66 photos

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

Neil Wyatt12/03/2018 11:17:34
12817 forum posts
562 photos
67 articles

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

Tractor man12/03/2018 13:27:27
405 forum posts
195 photos

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.

David Standing 112/03/2018 13:35:06
900 forum posts
40 photos

I cheated on my ID, there's one for sale on devil

Bazyle12/03/2018 21:33:16
3750 forum posts
166 photos

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.

Tractor man13/03/2018 08:45:30
405 forum posts
195 photos
Bazyle, apparently these chucks were designed for production where stopping and starting the spindle wasted time, costing money.
If you're constantly changing drills on a job it can come in handy. Plus the self tightening feature of the chuck in my original post is good for people with poor grip strength, I sometimes struggle with standard keyless chucks.
Bazyle13/03/2018 13:13:14
3750 forum posts
166 photos

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.

Tractor man13/03/2018 16:25:09
405 forum posts
195 photos
Bazyle I didn't mean to teach you to suck eggs so I'm sorry old you thought I was.
I think you have a wahlstrom type chuck? A knurled collar and a plane tapered nose looking like a keyed chuck but without a gear ring.
I have one similar and it is quite a knack to change bits I admit, but I guess that workers would have gotten on with the job prior to elf and safety.
I hold the shank of the drill rather than the flutes and seem to be ok changing at 1300 RPM.
But obviously going from a 1/64 drill to 3/8 would need a speed change anyway.
Maybe I will fit it in my jig borer with variable speed pulleys.
jimmy b13/03/2018 18:16:10
333 forum posts
16 photos

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


Tractor man13/03/2018 19:50:46
405 forum posts
195 photos
The chuck works by allowing the bit removed and refuted while the spindle is turning.
Holding the knurled collar and pulling down releases the drill, holding the nose of the chuck closes it on the bit.
There is a video on YouTube if you look for quick release drill chucks.
One book I use advises their use is good on a mill where the spindle takes time to slow to a stop.
The chuck I posted about initially works by a set of cam operated rollers. Holding the collar while it is running opens the rollers and releasing it snaps them back onto the drill.
Both types are good if your changing bits often.

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