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 20:29:12 GMT
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Viewed:
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582 times
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In lugnet.technic, Jennifer Clark writes:
> > Well, I definitely did not have any such problems with my 8448, so my
> > guess would be that some gear or other is blocked somewhere. Have
> > another go.
>
> Agreed. I remember my 8448 as being very smooth when it was built, and I was
> able to motorise it using the older 9V ungeared motor no problem. If my
> memory is correct I geared the motor down by 9:1 before the gearbox, and it
> would even start in the higher gears, just as long as it was on vinyl at the
> time! I remember being pleasantly surprised by the power of the motor, as
> the only previous similar experience I had had was trying to move the 8860
> with the old 4.5V motor, which moved like a slug on tranquilisers, as they
> say...
I ripped the gearbox apart and tried again, and I think I solved it - the
motor I had on the mountings behind the engine to drive the gearbox was a
bit loose so I'd added some plates to hold in place, and I think one of them
was catching on the gear the motor was driving. I've used 1 wide plates
instead of 2 wide and it seems just as secure, but the cracking noise has
gone. As far as I can tell the gear was jamming and causing the motor gear
to skip, although the reverse gear was also playing up. Taking it apart and
rebuilding seems to have cured everything. I also found a knot of hair
around one of the axles in the gearbox which probably didn't help - guess I
need to get my hair trimmed, although I was hoping the trim last year was
enough :)
Dan
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Message is in Reply To:
 | | Re: 8448 gearing problems
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| (...) Agreed. I remember my 8448 as being very smooth when it was built, and I was able to motorise it using the older 9V ungeared motor no problem. If my memory is correct I geared the motor down by 9:1 before the gearbox, and it would even start (...) (23 years ago, 12-Nov-01, to lugnet.technic)
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