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Another Mystery Tool

Holder for screwed end & slotdrills.

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Brian H24/02/2016 16:39:58
2312 forum posts
112 photos

I bought this recently via ebay and wondered is anyone recognizes the type.

There is no makers name on it but it is clearly another version of a Clarkson Autolock though a bit more complicated.

One of the threaded oval plates is missing but as it's for the largest size of cutter I'll be unlikely to need a replacement although It wouldn't take much effort to make one.


Chris Evans 624/02/2016 16:50:46
2057 forum posts

That looks home made to me. I have seen most variations on the Clarkson theme.

ega24/02/2016 18:14:02
2540 forum posts
201 photos

Brian Hutchings:

An interesting design. The provision for restraining the cutter axially seems different from the Clarkson. Perhaps you would test for the effectiveness of this and report back?

MW24/02/2016 19:28:13
2051 forum posts
51 photos

what an intriguing find, If it is home made then they were no stranger to delicate machining needed for the collets.

Michael W

Bazyle24/02/2016 19:42:11
6324 forum posts
222 photos

MMMM home made but in the style of the Acramil with the thick end of the collet at the bottom of the socket?

daveb24/02/2016 20:40:30
626 forum posts
10 photos

It resembles the early Osborn Titanic milling chuck except the threaded oval plates were not used by Osborn, they had a disc with a slot. The center pin which locates in the end of the cutter is missing, easy enough to make one. The chuck works thus, rotation of the cutter causes the oval plate (which is restrained from rotating) to move down the cutter thread, pushing the sleeve downwards to compress the collet. They do grip the cutters very well. Perhaps it is Mr Osborn's original prototype.

Neil Wyatt24/02/2016 21:08:48
19037 forum posts
734 photos
80 articles

I've got an Osborn Titanic II, I don't know if the Mk.1 was different, but that's nothing like my chuck.

Is there a locating cone missing from the inside of the body?


Brian H25/02/2016 07:55:21
2312 forum posts
112 photos

Many thanks for the replies, I did wonder if there should be a centre cone. I'll try and get a better picture of the internal details of the body.

Parts of it look home made, for instance the threads are rougher than would be expected on a professionally made item and it seems to have spent some time half submerged in water. The outer body looks to have been chrome plated but was damaged by vice jaws so I have machined it smooth.

I think it will do any milling that I might be doing.

daveb25/02/2016 11:18:36
626 forum posts
10 photos

Neil, yes, the Titanic II is different, 1 piece collet. I use one of these, also a more recent Soba chuck, this is a direct copy, the collets are interchangable.


Brian H25/02/2016 20:11:06
2312 forum posts
112 photos

p1130309.jpgTook a couple more pictures.


Brian H25/02/2016 20:16:23
2312 forum posts
112 photos

The picture inside the body shows a 3/8" hole that goes down about 1 1/4" and I've found a piece of 3/8" silver steel that has been turned down to use as a temporary centre. If I clean it up it will serve as a support cone.

Bazyle26/02/2016 00:24:25
6324 forum posts
222 photos

Is the hole straight of tapered? Clarksons use a 0 Morse taper centre. The use of an oval thread plate seems a bit awkward to make suggesting it was a patent busting measure perhaps.

Brian H26/02/2016 20:08:10
2312 forum posts
112 photos

Bazyle, the hole is a straight 3/8" inches.

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