Subject:
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Re: JCB JS220 Excavator
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Newsgroups:
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lugnet.technic
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Date:
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Wed, 3 Dec 2003 20:50:52 GMT
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Viewed:
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4257 times
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I used quite a few of the black technic “axle pin with friction” for rollers,
but in fact they don’t actually roll, the tracks just slide over them. It
seems to work quite well.
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Never tried that one - nice space saving idea. What I tried some time ago was to
use plates with the studs on the side so that the track runs over the edge of
it. This allows to build very narrow track frames. If I remember right, in a
very old Dacta set, this idea was used to build a chain saw with the narrow
track links.
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There is more history to the tracks than on the site though; after doing the
videos the tracks seemed to have stretched a bit and therefore came off quite
easily when turning corners. To remedy this I spring loaded the non-driven 24
tooth gears holding the tracks to keep them tight no matter how stretched the
tracks get, and it seems to work well. I’ll put some more information about
this on the website when I get the CAD stuff for it done.
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Looking forward to it.
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Have you seen the latest lego club magazine? They have a competition in it
which links the 8455 and a real JCB backhoe.
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No, I haven’t. So far I haven’t become a world club member. Is it worth to do
so, except for the magazine?
Or is there a place on the net where a digital version of the club magazine can
be downloaded?
Beat
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Message has 2 Replies:
 | | Re: JCB JS220 Excavator
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| (...) In my crawler crane I used axle pins with 1/2 bush on them, see (URL) here>. These didnt really rotate much either, but the bush fitted nicely in the centre of the tracks keeping them nicely aligned. Of course mine wasn't motorised... (...) (...) (20 years ago, 3-Dec-03, to lugnet.technic, FTX)
| | | Re: JCB JS220 Excavator
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| beat.felber@fhso.ch (Beat Felber) wrote in <HpC78s.1szu@lugnet.com>: (...) The disadvantage of this construction is that the track links are liable to snag on the edges of the plate. (20 years ago, 4-Dec-03, to lugnet.technic)
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Message is in Reply To:
| | Re: JCB JS220 Excavator
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| (...) Very true. In addition to this, had I applied 1x6 tiles the superstructure would have fouled on them when slewing, there was not enough clearance between the superstructure and the tracks to allow the fitting of 1x6 tiles. (...) I used quite a (...) (20 years ago, 1-Dec-03, to lugnet.technic, FTX)
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