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Knurling wheels misterry

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Sonic Escape05/04/2023 21:17:51
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194 forum posts
5 photos

I bought one of these knurling tools that seems to be everywhere. They came with three sets of wheels. When I merged together the wheels with the largest teeth I noticed that they only partially overlap. Then I counted them and one wheel has 33 teeth and the other 34! Is this normal? What can be the purpose?

Macolm05/04/2023 21:39:52
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185 forum posts
33 photos

Possibly a "hunting tooth" to average out variations, so avoiding patterning?

bernard towers06/04/2023 15:59:25
1221 forum posts
161 photos

That sounds like a bin job!

Tony Pratt 106/04/2023 17:00:01
2319 forum posts
13 photos

China (or India), strikes again, get a refund.

Tony

Roderick Jenkins06/04/2023 17:25:15
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2376 forum posts
800 photos

Does it matter? What does the pattern look like?

Rod

Baz06/04/2023 17:59:55
1033 forum posts
2 photos
Posted by Sonic Escape on 05/04/2023 21:17:51:

I bought one of these knurling tools that seems to be everywhere. They came with three sets of wheels. When I merged together the wheels with the largest teeth I noticed that they only partially overlap. Then I counted them and one wheel has 33 teeth and the other 34! Is this normal? What can be the purpose?

No it is not normal, wheels should have the same number of teeth or serrations.

Phil Whitley06/04/2023 18:33:46
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1533 forum posts
147 photos

Try it, It may be perfectly good, it does sound like a hunting tooth, try it out and post up some pics.

Phil

bernard towers06/04/2023 19:17:15
1221 forum posts
161 photos

I don't understand how you can have a hunting tooth on a knurling tool when the object is to have the wheels follow the same path every revolution or am I missing something?

Brian G06/04/2023 19:34:24
912 forum posts
40 photos

First question that comes to mind is whether the diameters are in the same 33/34 ratio?

Brian G

Michael Gilligan06/04/2023 19:52:21
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23121 forum posts
1360 photos
Posted by bernard towers on 06/04/2023 19:17:15:

I don't understand how you can have a hunting tooth on a knurling tool when the object is to have the wheels follow the same path every revolution or am I missing something?

.

I’m with you there, Bernard yes

MichaelG.

… eagerly awaiting someone’s explanation..

SillyOldDuffer06/04/2023 20:33:15
10668 forum posts
2415 photos

Odd, but are the two wheels the same diameter? If so, they should have the same number of teeth to give the same pitch.

A possible explanation. Noting that it's the pitch that's important, not the number of teeth, if one of the wheels is made slightly larger, an extra tooth could be added to maintain the same pitch. The advantage of having an extra tooth on one wheel is it would distribute wear by rolling one wheel slower than the other.

Dave

Fulmen06/04/2023 20:41:26
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120 forum posts
11 photos

I don't buy the hunting tooth theory, the two wheels aren't connected in any way.

My guess would be that they got two batches of cheap wheels and just mixed them together. If they're the same pitch the knurl should turn out the same. If they're the same diameter the knurl would be slightly asymmetric but I doubt it's noticeable.

DiogenesII06/04/2023 22:10:15
859 forum posts
268 photos

33/34.. ?..for creating metric knurls on Imperial stock..? devil

Macolm06/04/2023 22:18:01
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185 forum posts
33 photos

Once there is an impression of the knurl on the work, it becomes exactly like three gear wheels running together. They stay in mesh. The advantage of a hunting tooth is that the effects of irregularities and wear will be averaged. The wheels would, of course, be constant pitch so slightly different diameters. If so, this may be a superior knurling tool!

Michael Gilligan06/04/2023 22:38:52
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23121 forum posts
1360 photos
Posted by Macolm on 06/04/2023 22:18:01:

Once there is an impression of the knurl on the work, it becomes exactly like three gear wheels running together. They stay in mesh. The advantage of a hunting tooth is that the effects of irregularities and wear will be averaged. The wheels would, of course, be constant pitch so slightly different diameters. If so, this may be a superior knurling tool!

.

I’m happy to be wrong, but this statement from the opening post suggests wheels of the same diameter, but with different tooth counts: “When I merged together the wheels with the largest teeth I noticed that they only partially overlap.”

MichaelG.

Sonic Escape07/04/2023 07:43:18
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194 forum posts
5 photos

The wheels have exactly the same diameter, 25.83mm. I can't try them very soon because I have to fix better the tool post for this kind of operation. Here there is a better picture where you can see how the teeth start to be misaligned from the bottom:

This is how I noticed in the first place that they have a different number of teeth. Besides that the wheels are identical

Edited By Sonic Escape on 07/04/2023 07:47:05

Sonic Escape07/04/2023 07:58:34
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194 forum posts
5 photos

For the 1mm pitch wheels is the same story. 69 and 70 teeth. So maybe there is a reason for this. Apparently knurling is still hiding some secrets smiley

It is strange that they don't have a marking to separate them.

Edited By Sonic Escape on 07/04/2023 07:59:02

Michael Gilligan07/04/2023 08:06:51
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23121 forum posts
1360 photos

Thanks for the clarification yes

I remain bewildered as to how that arrangement could be useful

… but we’re all here to learn.

MichaelG.

Martin Kyte07/04/2023 08:11:41
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3445 forum posts
62 photos

Why does it matter?

Each wheel has only to register in the imprint it made on the previous revolution. Even the rivet counters are never going to notice that the rhombus pattern is not perfectly dimensioned across the sides.

regards Martin

John Haine07/04/2023 08:35:15
5563 forum posts
322 photos

Try rolling them across a softish flat surface while fitted in the tool. Soft wood, plasticine? See what kind of pattern they imprint.

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