Sonic Escape | 05/04/2023 21:17:51 |
![]() 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? |
Macolm | 05/04/2023 21:39:52 |
![]() 185 forum posts 33 photos | Possibly a "hunting tooth" to average out variations, so avoiding patterning? |
bernard towers | 06/04/2023 15:59:25 |
1221 forum posts 161 photos | That sounds like a bin job! |
Tony Pratt 1 | 06/04/2023 17:00:01 |
2319 forum posts 13 photos | China (or India), strikes again, get a refund. Tony |
Roderick Jenkins | 06/04/2023 17:25:15 |
![]() 2376 forum posts 800 photos | Does it matter? What does the pattern look like? Rod |
Baz | 06/04/2023 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 Whitley | 06/04/2023 18:33:46 |
![]() 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 towers | 06/04/2023 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 G | 06/04/2023 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 Gilligan | 06/04/2023 19:52:21 |
![]() 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 MichaelG. … eagerly awaiting someone’s explanation..
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SillyOldDuffer | 06/04/2023 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 |
Fulmen | 06/04/2023 20:41:26 |
![]() 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. |
DiogenesII | 06/04/2023 22:10:15 |
859 forum posts 268 photos | 33/34.. ?..for creating metric knurls on Imperial stock..? |
Macolm | 06/04/2023 22:18:01 |
![]() 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 Gilligan | 06/04/2023 22:38:52 |
![]() 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 Escape | 07/04/2023 07:43:18 |
![]() 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 Escape | 07/04/2023 07:58:34 |
![]() 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 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 Gilligan | 07/04/2023 08:06:51 |
![]() 23121 forum posts 1360 photos | Thanks for the clarification I remain bewildered as to how that arrangement could be useful … but we’re all here to learn. MichaelG. |
Martin Kyte | 07/04/2023 08:11:41 |
![]() 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 Haine | 07/04/2023 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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