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Thread: Mystery Instrument !
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13th May 2013, 05:59 AM #1
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Mystery Instrument !
Hi Guys,
A puzzle. The photos below show an item that was in a box of bits and pieces that I acquired recently.
The disc on the front is calibrated 0 - 100 in steps of ten with the outer numbers running one way and the inner ones going the other. Behind the disc is a brass gear which can be rotated either by moving the centre disc or by a rod inserted in the hole. I suspect that there are parts missing but have no idea at all what they may be. The makers name is LS Starret in the USA. I've been and looked on the Starret web site but I cannot find anything at all which resembles this instrument. There is no model number or other marks that could be used to identify it.
I hope that someone here recognises this.
Thanks.
BaronJ.
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13th May 2013 05:59 AM # ADSGoogle Adsense Advertisement
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13th May 2013, 06:25 AM #2
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I think it is a (incomplete) Starrett speed indicator:
High Speed Indicator - L. S. Starrett, No. 104, circa 1910 - Museum Victoria
Cheers, Jan
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13th May 2013, 08:52 AM #3
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How good is that?
Answered within 30minutes.
Cliff.
If you find a post of mine that is missing a pic that you'd like to see, let me know & I'll see if I can find a copy.
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13th May 2013, 09:40 AM #4
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Heres a video for it
MACHINE SHOP TIPS #88 Measuring Cutting Speeds tubalcain - YouTube
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13th May 2013, 11:46 AM #5
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Gents this is why I love this forum the wealth of knowledge out there is immeasurable.
Originally Posted by Cliff Rogers
How good is that?
Answered within 30minutes.
The selfless help that is shared among the members contribute to what I believe to be the best forum on the internet.John
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13th May 2013, 06:22 PM #6
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Good Find
Hello Jan,
Somewhere I have the 'Tacho' version of this. It came to me via my father & grandfather. I suspect it may be a chronometric (clockwork) tacho - which are quite accurate for their RPM range. Old MGs up to about the TD/TF had Chrono Tacho's and Speedo's. When I get home from the 'enforced holiday' at the Sunshine Coast, I will have a look for it. I think it has tips with it that are the same.
In the meantime, any sympathy extended to me for being deprived of my SHED for a week will be well received. I'm surprised some of the southerners have'nt heard me whining!
Regards, Daryl
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13th May 2013, 07:44 PM #7
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Have had this tool for many years but have lost the wheel and not sure what the dia is to make one does any one know,or how to work it out.
Eddie
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13th May 2013, 10:53 PM #8
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Hi Eddie,
the circumference is 6" so that in two revs the perimeter of the wheel will have travelled one foot.
Phil
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13th May 2013, 11:07 PM #9
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Originally Posted by Steamwhisperer
So,,, circumference = pi * diameter .. diameter = 6" / 3.142 = 1.9096 inches
Now, if you made the wheel 159.13 mm diameter you'd have a metric version with a circumference of 500mm or 1 meter every 2 revs.
Regards
Ray
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13th May 2013, 11:18 PM #10
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Thanks for doing the maths Ray, My head is trying to morph into a moron at the moment. Originally Posted by RayG
So,,, circumference = pi * diameter .. diameter = 6" / 3.142 = 1.9096 inches
Now, if you made the wheel 159.13 mm diameter you'd have a metric version with a circumference of 500mm or 1 meter every 2 revs.
Regards
Ray
Phil
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13th May 2013, 11:25 PM #11
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Just remember these are only good for measuring imperial RPM's, metric RPM's are entirety different......
1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
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14th May 2013, 07:17 AM #12
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Hi Guys,
Awesome ! I find a hundred year old instrument and get to find out what it is almost instantly.
Thanks ! The collective knowledge here is immense.
Best Regards:
BaronJ.
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16th May 2013, 09:52 PM #13
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A Tacho Version (see post #6)
Hi Baron J,
I found it! But it isn't same Mfr. This Tacho is in a box from Manning, Maxwell & Moore, Bridgeport Conn. I see they are a now defunct 'Railroad Supplies' company, The Mfr of the tacho is Ashcroft American - and they ARE still in business;
Ashcroft Pressure and Temperature Instrumentation, Test Gauges, Temperature Gauges and Pressure Gauges
My guess is that it's age may be about WW2.
It has 3 input shafts;
0 - 500 rpm
0 - 1000 rpm, and
0 - 5000 rpm
It still works perfectly well. Solid brass, painted in it's original 'crinkle black'
Regards, Daryl
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