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Thread: Helical gear maker?
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25th May 2021, 09:54 PM #16Philomath in training
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Yes - that's my mill in the video I linked to...
If it is only a speedo drive then probably something like some 4140 or similar would be good enough, as there is not really any power being transmitted. (Elan beat me to it)
There is not really a way around the universal mill issue for helical gears, as part of the deal is that the table gets set over to the helix angle. If you could gear the D/H to your table drive, you might be able to do something by tilting the head, but you would still need a universal dividing head. Most people only have a semi-universal head though - way cheaper, but without the gears or drive train on the side. The gears are just to get the ratio, so nothing special. The ones on my set up are all ones I made myself as part of refurbishing the D/H.
Without wishing to do Elan out of his fun, if you can work out what you need I can probably cut one for you. The two gears on the start of that video are a new/old comparison from a belt sander and are around the size you want. (Tip - start belt sanders in free air rather than in hard contact with the surface or you too may be looking for another gear)
Michael
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25th May 2021, 10:00 PM #17Gear expert in training
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You're welcome to it if you want Michael
Just wasn't sure how many people here were equipped for helicals that small so I thought I'd pipe upGear cutting specialists and general engineers www.hardmanbros.com.au
Fine pitch gear cutting from 0.1 Module www.rigear.com.au
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25th May 2021, 10:02 PM #18Philomath in training
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I'm just an amateur though - you're the guy that knows what he is doing.
Michael
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25th May 2021, 10:06 PM #19Gear expert in training
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I know what I'm doing with straight gears, still learning on helicals...I just have the fancy toys to play with lol
Gear cutting specialists and general engineers www.hardmanbros.com.au
Fine pitch gear cutting from 0.1 Module www.rigear.com.au
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25th May 2021, 10:14 PM #20Mechanical Butcher
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It has shoulder each end, as seen in the photo. The overall length is 22mm, the toothed part is 14mm long.
OD=12mm, and it's pressed onto a 6mm shaft.
It has 11 teeth.
The gear in the photo does not have the required helix, but is identlcal in all other ways.
When I use gears like this one, because of the wrong helix, the speedo works for a while then the teeth get chewed out.
ducsinspeedogear.jpg
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25th May 2021, 10:22 PM #21Mechanical Butcher
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25th May 2021, 10:33 PM #22Most Valued Member
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GaugeWorks in Adelaide will likely be able to assist you with something off the shelf.
https://www.gaugeworks.com.au/#services
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25th May 2021, 10:36 PM #23Gear expert in training
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24DP is the closest normal pitch, but it's still a bit off the mark...I'd want to roll the gear with a hob to confirm it.
Could you change both gears to straight? It would make life much easier at the expense of a bit of whine; 14.5 degree pressure angle runs pretty quiet and a smear of good grease might help damp the noise.Gear cutting specialists and general engineers www.hardmanbros.com.au
Fine pitch gear cutting from 0.1 Module www.rigear.com.au
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25th May 2021, 10:37 PM #24Most Valued Member
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25th May 2021, 10:42 PM #25Mechanical Butcher
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Wow, it's been a rapid exchange of messages, and it sounds like I might have a couple of possible helpers after all.
I will try to get the module, PA and helix info to progress the project!
Nadroj
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25th May 2021, 10:47 PM #26Mechanical Butcher
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25th May 2021, 10:57 PM #27Mechanical Butcher
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25th May 2021, 11:06 PM #28Golden Member
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25th May 2021, 11:09 PM #29Gear expert in training
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Ok, turns out I can't do math But it's still a weird pitch...
12mm, 11 teeth = 0.923 Mod, nearest imperial is 28DP (0.907 Mod). Again, I'd want to run it with a hob to confirm what it actually is because helicals can be a bit weird when it comes to pitch (transverse pitch vs. normal pitch, or pitch at 90 degrees to the bore vs. pitch at 90 degrees to the helix)Gear cutting specialists and general engineers www.hardmanbros.com.au
Fine pitch gear cutting from 0.1 Module www.rigear.com.au
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25th May 2021, 11:09 PM #30Most Valued Member
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A sweet 450 desmo, thanks for the pic's.
I think I have one of the first ducati engines somewhere, 50cc 4 stroke with exposed pull rods.
They made them to bolt onto push bikes.
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