Subject:
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Re: Posi-trac differential?
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 7 Sep 2001 15:55:08 GMT
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Viewed:
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2078 times
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In lugnet.robotics, John Barnes writes:
> Rob wrote: • Boy I wish there were some 40t gears with
> > clearance
> > holes in the center!
>
>
> Make one ;)
>
> If you're not sure you want to put a hole in the ones you have, buy some spares
> beyond your stock requirement for ones with cross axle holes and adjust them.
>
> As a simple tip, use a drill press. Mount the gear using black friction
> pegs into
> a block of technic beams. Hang on to the technic beams in a vise. Drill with a
> 3/16 drill (0.1875") which will usually over size to about ~0.190 - 0.193
> which is
> perfect. If you can borrow a four flute 3/16" end mill instead of a drill,
> use it
> nstead, it will give you a much better quality hole and will be less
> inclined to
> wander.
>
> JB
Wow, words of wisdom from a true hacker! I'm not inclined to parts
modification, but if I really need to, I sometimes will. When I was young
without much Lego, I made some 2L and 5L axles :) I also filed some
clearance for a gear into a 2x4 plate. Now, since I regularly participate in
'pure Lego only' competitions, I am more of a purist.
Rob
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Message is in Reply To:
 | | Re: Posi-trac differential?
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| (...) Make one ;) If you're not sure you want to put a hole in the ones you have, buy some spares beyond your stock requirement for ones with cross axle holes and adjust them. As a simple tip, use a drill press. Mount the gear using black friction (...) (23 years ago, 6-Sep-01, to lugnet.robotics)
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