What are these? My first post.

This topic has 15 replies, 14 voices, and was last updated 12 November 2020 at 19:53 by Rob Gibbons 1.

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10 November 2020 at 21:04 #506578
Rob Gibbons 1
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@robgibbons1
Hello all I've been hanging around here taking in all the advice given, thank you.

I now would like some direct help, I have found these among some tooling that I acquired and wondered if anyone could give me a clue as to what they are and who might of produced them? They look like gear tooth profile gauges, I have found similar types of things using qoogle but those are similar to thread gauges and are not "complete gears" as these are.

Thank you.
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10 November 2020 at 21:04 #33720
Rob Gibbons 1
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@robgibbons1
11 November 2020 at 09:00 #506671
Michael Gilligan
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@michaelgilligan61133
Greetings, Rob

I’m sure you are on the right track with them being test gauges, but sorry … I’ve never seen the like of them before.

MichaelG.
11 November 2020 at 09:19 #506682
Thor 🇳🇴
Participant
@thor
Hi Rob,

As MichaelG, I have never seen anything like these. The markings indicate 0.3 MOD etc. so I assume that means Module used for metric gear wheels, so could they be gear wheels gauges?

Thor
11 November 2020 at 09:49 #506694
Stuart Bridger
Participant
@stuartbridger82290
Looks from the photo's that they are made from aluminum alloy? If so I wouldn't have thought that they would be durable enough for a gauge? I am thinking either apprentice test work or perhaps some form of sales samples.
11 November 2020 at 10:06 #506702
John Haine
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@johnhaine32865
Lots of people post questions like "how do I identify the modulus or pressure angle" of this gear? I would think that a quick test against the correct one of these would answer the question very quickly. OK the few teeth you use for a quick test might get worn a bit but there are others round the periphery.
11 November 2020 at 10:09 #506704
Phil P
Participant
@philp
Maybe for use in a college as a teaching aid ?

They could be used on a shadowgraph for comparing gear teeth.

Phil
11 November 2020 at 10:20 #506712
Brian H
Participant
@brianh50089
Hello Rob and welcome. That's quite a debut, to get so many people guessing!

Hopefully someone will come up with the definitive answer.

Brian
11 November 2020 at 11:17 #506742
Neil Wyatt
Moderator
@neilwyatt
As they have no slot for a driving key they are not intended for practical use as gears (I think the possibility they are a set of emergency metric idlers is vanishingly small).

They are probably either gauges, a teaching aid or exercise, or test pieces to prove a set of cutters.

I imagine the first is the most likely, it's easier to judge how two gears fit by rolling them together than by trying to match a small segment.

Neil
11 November 2020 at 12:08 #506756
John MC
Participant
@johnmc39344
I've seen used and occasionally used myself a similar set of "gears" for teaching. A demonstration of meshing, profile shift, undercutting and so forth. Not as many gears but an effective teaching aid.

John
11 November 2020 at 12:23 #506759
Bo’sun
Participant
@bosun58570
I like the idea of their use on a shadowgraph, but they may be too thick to produce an accurate profile.

Too many I think, and probably too precise for a teaching aid. I guess it could be missing, but as a teaching aid, they would need some sort of mounting board with adjustable shafts.

Interesting non-the-less. I can't wait for a definitive answer.
11 November 2020 at 13:48 #506777
Marischal Ellis
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@marischalellis28661
Moving sideways….are they draughtsmans templates? Just a thought but they look clean and well looked after. Not so sure about the smaller ones though as they look difficult to use but……..Working of the centres only would be OK.

Hope everyone is keep safe.
11 November 2020 at 15:06 #506790
Bill Davies 2
Participant
@billdavies2
They seem too thick for templates. It's difficult to see why there would be so many, just to highlight, say, module size. If they were very well finished, I might say master gears for use on a gear rolling tester, but they don't seem to be ground finished.
11 November 2020 at 15:34 #506795
Henry Brown
Participant
@henrybrown95529
Master gears was my first thought but the quality just isn't there and the big ones probably don't have enough face width. My moneys on teaching aides with the big ID letters and numbers.
11 November 2020 at 16:29 #506810
SillyOldDuffer
Moderator
@sillyoldduffer
Stack of blank gears of different sizes and modules, clearly marked and mounted on a stand. Sherlock Duffer concludes they're counter gauges.

Customer walks into the shop and produces a gear from his latest bargain, the wobbulator off a Vickers Vespa. Got one of these mate he asks?

Easiest way to identify Gears is to compare them with a gauge. Rather than scrabble about looking for easily lost strip gauges, a couple of those on the counter solve the problem. Any situation where someone needs to identify an unidentified gear.

Can we see a picture of one of the big gears? Although the small ones have all their teeth, I think the lower examples are gappy, and more obviously gauges.

Dave
12 November 2020 at 19:53 #507096
Rob Gibbons 1
Participant
@robgibbons1
To answer a couple of your questions, yes they are an aluminium alloy and the larger gears do have teeth all way around. Thank you all for your responses.
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