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Author Topic: Non-Circular Cage Gears  (Read 108 times)
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MBrez
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« on: September 08, 2018, 04:49:05 PM »

Art,

Are Non-Circular Cage Gears possible?  If so, please consider as a suggestio n for the future, I got this crazy idea I've been noodling.

Cheers,
Mark Brzeszkie wicz
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ArtF
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« Reply #1 on: September 09, 2018, 06:10:37 AM »

Hi Mark:

   Gearotic wont make them but their possible Id think. The cage is easy,
just mount a pin on each tooth position. But the changing pressure angle
may make the mates cycloidic teeth look strange. I think youd need to do
a digitial rotation subtracti on to see what the end shapes look like, but
I imagine youd get what looks like a normal cage gear and mate but with
slightly distorted pinion teeth..ho w much would depend on the elliptica l
coefficie nt. Pressure angles on that tooth shape probably dont make much
differenc e though, so I wouldnt think the distortio n would be much..

  Ill have to think about what that would look like..

Art


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MBrez
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« Reply #2 on: September 09, 2018, 11:18:43 PM »

Hello Art,

Thanks for your thoughts and any possible update.

I'm looking to do some crazy things.  BTW - I'm currently working on a project within Gearotic and have a 151 elliptica l Gear-Train.  I'm amazed on how your software is able to simulate all 150+ gears at once, truly amazing.

Cheers,
Mark
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ArtF
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« Reply #3 on: September 10, 2018, 06:41:03 AM »

Hi Mark:

  Glad to hear your having fun...

   Take care of the friction and pressure angle elements involved. You wouldnt be the first to
assume that Gearotics simulatio n of a large number of gears in a train would
be easy to rotate. Smiley , I once made one of about 6 elliptica ls, but when the pressure
angles at the high end add together the power to rotate is very high.

   The pressure angle effect in elliptica ls are not only additive, but ratio'ed so
that if a high pressure angle at a particula r rotationa l position produces a
drag that takes higher torque to turn it, that torque requirmen t is amplified
by the ratio's all the way back to the powered gear. Not too bad in smaller
elleiptic al coefficie nts, but highly elliptica l gears can take alot of toque to
turn in a train.

 (Just figured Id mention that just in case you get too many elliptica ls
in a line. Smiley , I dont imagine you want to have to use an 8 cylinder engine to
drive them.  )

Art
 


 

   

   
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MBrez
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« Reply #4 on: September 10, 2018, 07:43:27 PM »

Art,

While I was creating my Gearoscop e I actually found the opposite.  With some nice bearings and a gear-train of 20 elliptica l's, this sucker spun like a top when it wasn't mounted to its drive mechanism .

Enjoy ......... ...... https://youtu.be/X1niIkdBEEI

Cheers,
Mark
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ArtF
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« Reply #5 on: September 10, 2018, 08:20:49 PM »

lol.. awesome use. 

Art
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