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Getting Loose fitting gears
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Topic: Getting Loose fitting gears (Read 1348 times)
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John T
Hero Member
Posts: 568
Getting Loose fitting gears
«
on:
July 19, 2019, 08:25:56 AM »
Hi Art,
This is probably backwards to what most people want from Gearotic, but here goes!
I make lots of gear combinati
ons that if fit of 4" by 5" blocks I call them "Fidgets" (I was making them years before the spinner fidgets came out) For most of these Fidgets I can use my deputing gage to get a good "loose" mesh on the gears and they sell well to young and old at a Farmers Market.
One of the Fidgets I have trouble with is a block of gears. I can make a block of nIne gears without too much trouble, however I'm trying to make a block of 15 and I can't get the meshing predictab
ly loose enough that guarantee
s that a child can work them. Currently I'm using the boxing function to give me the arbor spacings and it works, but with cumulativ
e errors and wood being what it is the finished product will not turn freely.
Is there a way to increase "backlash" to make them set looser?
IMG_0103.jpg
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ArtF
Administrator
Hero Member
Posts: 5745
Re: Getting Loose fitting gears
«
Reply #1 on:
July 19, 2019, 08:54:52 AM »
Hi John:
Gearotic 1 used to move the shafts slightly, but Ive found the math
works better if you simply widen the tooth spacing, that allows a bit of slop in
all direction
s.. Just change form 50% to 49% and see the effect in simulatio
n.
(Nice looking block..
Art
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John T
Hero Member
Posts: 568
Re: Getting Loose fitting gears
«
Reply #2 on:
July 19, 2019, 09:57:42 PM »
Hi Art,
I did as you suggested and changed the tooth width to 49% - I could not detect any differenc
e in the simulatio
n (maybe my screen?) Anyway I changed it to 45% and then I could see a differenc
e. I cut a set of 15 gears and they work really nice and freely.
I took the old binding set and made the centre hole 1/32 bigger and now that one works as well - certainly not as elegant as your solution but it does work.
Here is a photo of the 45% set - kind of wildly coloured but will be a hit at the market.
Thanks for your help
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ArtF
Administrator
Hero Member
Posts: 5745
Re: Getting Loose fitting gears
«
Reply #3 on:
July 20, 2019, 06:04:23 AM »
Hi John:
>>Anyway I changed it to 45% and then I could see a differenc
e. I cut a set of 15 gears and they work really nice and freely.
Good to hear. It is not a very sensitive adjustmen
t as the additiona
l backlash
is a cosine function of the tooth width so its slow to take off as you adjust
downwards in width, but I too find 45% to be about right for such projects
and when I do wooden gears I lower it to at least 47% just for wood swelling
and such over time. Glad to hear it worked out.
Art
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Mooselake
Hero Member
Posts: 650
Re: Getting Loose fitting gears
«
Reply #4 on:
July 20, 2019, 03:41:12 PM »
We need a like button for the forum
Looks nice, John! Is that only a 4x5" block?
Would the same type of project work with eccentric gears?
Kirk
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John T
Hero Member
Posts: 568
Re: Getting Loose fitting gears
«
Reply #5 on:
July 20, 2019, 06:09:42 PM »
Yes the block is 4” by 5.25”.
I haven’t tried the eccentric as a block, so that is a challenge!!
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Mooselake
Hero Member
Posts: 650
Re: Getting Loose fitting gears
«
Reply #6 on:
July 22, 2019, 11:21:50 AM »
I can simulate a 2x2 array with 4 sided gears, 3 sided was a bust. I need to go back and review the doc videos to relearn how to get shafts exactly where I want them then give it a try with some 1/8" plywood that's sitting here going "Cut me, Cut me"
Kirk
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John T
Hero Member
Posts: 568
Re: Getting Loose fitting gears
«
Reply #7 on:
July 22, 2019, 05:46:41 PM »
If it will simulate then boxing will give you the shafts
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