Subject:
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Gear and Axle Strength (was Re: Power Pullin' With My Tractor)
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Newsgroups:
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lugnet.technic
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Date:
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Sat, 26 Jan 2002 13:46:33 GMT
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Viewed:
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2935 times
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In lugnet.technic, Jason S. Mantor writes:
> It's not pretty. I've sheared teeth on racks when using them for Z-axis
> (up/down) stages that had a fair bit of weight on them. It broke the
> pinions too : ( To be fair though, it was bad design on my part to use a
> rack and pinion for that. I should have used racks and worms to spread the
> load over more teeth...
> On your page you mention that some of your high-speed input gear stages
> wear out and generate fine dust. That's dry friction grinding away the
> tooth profiles. Try some graphite spray or silicone brake lube on them.
> The brake lube works well, but does seem to attract dust. Lubrication also
> makes the worm gears more useful.
Thanks for the advice. I know the subject of lubrication has been discussed
many times before here and I should listen, I've ruined too many gears now!
I'll have to try it next time.
> I don't even use my old 4.5 & 9V motors any more. The new 9V motors
> (5225?) are much kinder to gears, because they're already geared down and
> eliminate a couple of high speed stages in a gear train. Lately I've been
> using 3 or 4 of them ganged together and you can generate respectable
> torques that way. In fact you can twist an axle up if you're not careful :
> ( I've never had one completely fail in torsion, but I've made "twizzlers"
> out of a few by accident.
I agree. After using the new geared 9v motors I'm convinced they are the
best out of all the motors Lego make, or did make. I know some people have
had seizing problems and I think this has been discussed recently in the
.robotics group. But the motors seem to be quite efficient and excellent for
making high torque output gear trains.
TJ
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Message is in Reply To:
 | | Re: Power Pullin' With My Tractor
|
| It's not pretty. I've sheared teeth on racks when using them for Z-axis (up/down) stages that had a fair bit of weight on them. It broke the pinions too : ( To be fair though, it was bad design on my part to use a rack and pinion for that. I should (...) (22 years ago, 26-Jan-02, to lugnet.technic)
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