Nice old divider/compass?

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Nice old divider/compass?

Postby Jim J » Tue Aug 08, 2017 3:44 am

I picked this up at a flea market. It's a screw adjusted compass?
It was missing the adjustable point, I made one out of a carbide burr.
Interesting design, the cone point is spring loaded looks like it may be some watch/clockmaker tool.
Works good for scribing radii from a center hole up to 3/16"
The knob on the left is the adjustment screw.
Nice old style rope knurling on the screwheads.
The main beam is triangular.
I've never seen another like it.
Any idea what it is called or what it was made for?
Jim
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Re: Nice old divider/compass?

Postby jhobson » Tue Aug 08, 2017 7:24 am

I'm jealous! I've been looking for one for a long time. I saw one on e-bay for over £100 :( Like you, I think there is a more specific name.
Pics in George Daniels' Watchmaking but I think he just calls it a compass. In that book it is used for marking out and engraving watch dials. Also, with a bit of peg wood and paste instead of scribe head, used for polishing.
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Re: Nice old divider/compass?

Postby Mark D » Tue Aug 08, 2017 8:26 am

They are called Centre Hole Dividers.
Most of the tool makers, Starrett, Lufkin, Moore & Wright etc. had their own design on the same principle.
I have copied several different designs just because I like them!
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There are some details of their construction in the tools section of my website here.
Mark
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Re: Nice old divider/compass?

Postby Albert R » Tue Aug 08, 2017 2:18 pm

Mark,
What lovely tools you have created! You must just love to walk into your shop/bench and pick up such aesthetically pleasing tools! I only looked at one page before hopping back here to comment; I'll be spending a bit of time looking through your work today. You're skill with a file is near miraculous! My father had me file out a rectangular block of steel with a square notch in it to his specifications when I was about eight or nine. Ruined a file or two, caught a couple of cuffs behind the ear more than a few times, but finally managed to get it right. To this day I reach for files before most anything in order to fit or tweak something.
I'm looking forward to indulging myself with as much tool eye candy on your site as possible! :biggrin:
Thank you so very much for sharing your work with us!
Albert
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Re: Nice old divider/compass?

Postby Jim J » Tue Aug 08, 2017 2:47 pm

Yeah! CENTER HOLE DIVIDERS,
Makes sense.
Very nice tools.
I'd love to find a Lufkin marked one.
Over the years I've picked up a number of Lufkin machinist tools, they had the best quality stuff.
Too bad they went under in the early sixties.
Starrett tools are still good, but seem to have gone downhill slightly.

Mark, kudos on making your own.
I like the angled outer point design, mind if I copy it for mine?
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Re: Nice old divider/compass?

Postby Mark D » Tue Aug 08, 2017 7:04 pm

Albert - Thanks for the compliments, I just enjoy making stuff and it helps keep me out of the pubs at night.....
Jim - feel free, I copied it already (from one in Bill Robertson's collection, if you have not come across him Google 'Bill Robertson Miniatures')
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