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mystery tool

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geoff adams21/05/2020 06:56:45
195 forum posts
196 photos

img_1188.jpgimg_1186.jpgimg_1185.jpgmorning all these came in a box of lathe tools any ideas what they areimg_1184.jpg

not done it yet21/05/2020 21:00:25
5382 forum posts
20 photos


The fact that they look like a left and right setting tool makes me think they might be used on something like a fertilizer spreader, or similar, where contra-rotating throwers are involved. Just cannot understand why there is a negative setting.

We had to change the settings on a spreader recently and the instruction book was like a minefield to negotiate - what with prill size, machine height and slope, width of spread for the desired rate, ground speed, etc.

If they are anything to do with mills and lathes I would have no idea, but at least this is giving the thread a ‘bump’.

geoff adams22/05/2020 05:08:11
195 forum posts
196 photos

thanks for the reply they were going back in the shop as an unknow yes they are handed and the middle of the three holes is threaded


DiogenesII22/05/2020 06:40:37
171 forum posts
72 photos

..holders for (maybe the circular-type) thread form tool?

SillyOldDuffer22/05/2020 09:53:30
6681 forum posts
1501 photos

Something to do with levelling maybe, not necessarily a workshop tool at all.

I guess the handle part sits in a missing base and is set roughly to height with a pin through one of the plain holes. Then the adjustable top part is finely adjusted to height by sliding up the scaled ramp and clamping. Something fits loosely at a right angle between the flanges at the top. Lens, mirror, parallel, work item, no idea what.

Not a precision tool as used on an Optical Bench, but I suppose with a laser it would do a good job levelling over a metre plus.

A couple of features don't fit with my guess:

  • The tools are right and left-handed, why?
  • What's the threaded hole in the handle for?


Michael Gilligan22/05/2020 10:08:18
17035 forum posts
756 photos
Posted by SillyOldDuffer on 22/05/2020 09:53:30:


  • The tools are right and left-handed, why?
  • What's the threaded hole in the handle for?



The threaded hole, plus two ‘dowel holes’ suggests to me that these might be for attachment to a beam [cf Trammel Heads] ... The handed pair, featuring fine adjustment, then makes a caliper.

I would probably look to the picture-framing business, or similar.



Edit: ___ So I did look, and found this :

Not the same; but perhaps a family resemblance ?

Edited By Michael Gilligan on 22/05/2020 10:14:05

Speedy Builder524/07/2020 10:59:29
2186 forum posts
152 photos

caliper angle 1.jpg

Add this one to the list. Its from a watch / clock maker.

The "bezel" is marked in degrees, 0-72 with sector markings every 6 degrees. At zero degrees, the anvils are closed, at 72 degrees, the anvils are approx 0.6" wide. Makers name is IME England.

caliper angle 2.jpg

Edited By Speedy Builder5 on 24/07/2020 11:10:22

Martin Kyte24/07/2020 11:42:52
2155 forum posts
38 photos

The gauge is a Douzieme Gauge. Used to measure thickness of curved surfaces, for example watch cases. Increments are in 12ths of an inch. 1/12 x .72 = 0.6"

regards Martin

Speedy Builder524/07/2020 14:30:31
2186 forum posts
152 photos

Thanks Martin, I can't think of a practical use for it now that I know what it is (anyway in my workshop) !

Tim Stevens24/07/2020 21:26:35
1308 forum posts

Now available on well-known auction sites but calibrated in millimeters.


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