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Author Topic: connecting axle and cogwheel  (Read 1380 times)

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Offline mako34Topic starter

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connecting axle and cogwheel
« on: January 23, 2010, 06:39:29 PM »
hi, Im working on an  educational platform for kids in Colombia, using OLPC, classmate,
its going to be VEX compatible, and uses recycled things (like cog wheels from printers etc),

but I have  problems trying to secure the cog wheel to the axle,
tried with glue, doesnt resist, and because of the lower radius of the axle, the cogwheel is very disbalanced,
pictures next

tnx
gracias.

the board is based on arduino, works with logo blocks and scratch, the project is called hypercube, ;)
« Last Edit: January 23, 2010, 06:44:38 PM by mako34 »

Offline mako34Topic starter

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Re: connecting axle and cogwheel
« Reply #1 on: January 23, 2010, 06:40:34 PM »
the gears
very unbalanced,

Offline mako34Topic starter

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Re: connecting axle and cogwheel
« Reply #2 on: January 23, 2010, 06:44:08 PM »
the robot

Offline z.s.tar.gz

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Re: connecting axle and cogwheel
« Reply #3 on: January 23, 2010, 06:45:24 PM »
you may want to look into getting some sandpaper and epoxy to hold the cog on the axle. It won't be perfectly center, but I assume since you tried using just glue that isn't a problem.

Quick tips about epoxy and metal: Sand it down really well, and buy the "fast drying" epoxy.

Edit: I'm digging the home made whiskers. Way to go!
Save yourself the typing. Just call me Zach.

Offline mako34Topic starter

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Re: connecting axle and cogwheel
« Reply #4 on: January 23, 2010, 06:58:26 PM »
HI, tnx
I tried with tape (teflon tape, masking tape, sticky tape, with super glue, pegadit) as you can see in the picture, but wasnt strong enough ;(
« Last Edit: January 23, 2010, 07:03:14 PM by mako34 »

Offline z.s.tar.gz

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Re: connecting axle and cogwheel
« Reply #5 on: January 23, 2010, 09:56:03 PM »
Epoxy is a combination of a resin and a hardener. So given the right usage and application, it can be much stronger than super glue. It can also fill in the space between the axle and the cog unlike super glue because its cured form is much more solid.
Save yourself the typing. Just call me Zach.

Offline Soeren

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Re: connecting axle and cogwheel
« Reply #6 on: January 24, 2010, 12:27:24 AM »
Hi,

[...] because of the lower radius of the axle, the cogwheel is very disbalanced,
Use a bushing, made of a piece of metal tube, that fits snug on the axle and if needed, drill the centerhole to the size required by the outer measure of the tube. Use a very sharp drillbit and go fast (use a drill stand).


[...] the project is called hypercube, ;)
Why?

Btw. I don't dig your whiskers too much - they seem to be isolated in the place where they should make contact on "impact" and not where they're connected?
Do they work that way?
Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
Please remember...
Engineering is based on numbers - not adjectives

Offline z.s.tar.gz

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Re: connecting axle and cogwheel
« Reply #7 on: January 24, 2010, 07:41:33 AM »
I thought this had to be made from scrapped parts...
If it doesn't have to be, then do like soeren said and go with a bushing. It'll be much more centered aka balanced.
Save yourself the typing. Just call me Zach.

 


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