Subject:
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Re: 8448 gearing problems
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Newsgroups:
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lugnet.technic
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Date:
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Mon, 12 Nov 2001 12:22:27 GMT
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Viewed:
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467 times
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"Fredrik Glöckner" <fredrik.glockner@bio.uio.no> wrote in message
news:qrd3d3k9ttz.fsf@eos.uio.no...
> Have you made sure that all axles are loose and turn freely in the
> setup?
Yes, but I think I'll take it apart and check again in case something has
moved.
> If that doesn't work, you may need to redesign the gear box in order
> to properly motorize the car.
>
>
> The gear box in the 8448 is designed to have the wheels drive the
> motor. If you want the motor to drive the wheels, you'll want to
> redesign the gear box so that the fifth gear gives a 1:1 gear ratio,
> or something close. I suspect that the fifth gear on the original
> 8448 gear box is different, i.e. that it gears the wheel rotation down
> before passing it to the piston engine.
Really? When putting the car in first and pushing it forwards (without any
motors attached) the gearbox clicks badly, and does the same if reverse and
pushing it backwards. Running a motor seems to cure about 90% of the
clicking so it seems that the gearbox is designed to be powered to run the
wheels. Hopefully once I've taken apart the gearbox and had a good play I'll
find that a gear or 2 is loose and it'll be easy to fix, but I have a
feeling that the meshing just isn't good enough for the drive system to move
the weight of the car in any gear except first - and the weight of the RCX
with batteries in the boot probably doesn't help either!
Dan
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Message has 2 Replies:
 | | Re: 8448 gearing problems
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| "DC" == Daniel Crichton <danielc@helio.co.uk> writes: DC> When putting the car in first and pushing it forwards (without any DC> motors attached) the gearbox clicks badly, and does the same if DC> reverse and pushing it backwards. Well, I definitely (...) (23 years ago, 12-Nov-01, to lugnet.technic)
| | | Re: 8448 gearing problems
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| (...) I think it sounds like you have a problem with a stuck axle or something like that. Try to see if all the axles in the gear box run smoothly. Notice that in every gear position, _all_ the gear cogs in the gear box spin when the wheels are (...) (23 years ago, 12-Nov-01, to lugnet.technic)
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Message is in Reply To:
| | Re: 8448 gearing problems
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| (...) Have you made sure that all axles are loose and turn freely in the setup? If that doesn't work, you may need to redesign the gear box in order to properly motorize the car. The gear box in the 8448 is designed to have the wheels drive the (...) (23 years ago, 12-Nov-01, to lugnet.technic)
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