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Bugsy
Steam Supreme Being
Joined: 28 Jan 2009
Posts: 11106
Location: Sala, Sweden
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 Posted: Mon Sep 19, 2011 12:56 pm Post subject: |
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It's coming along, Bernie.
I hope it will be finished in time for STISS! 
Phil
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BK
Steam Legend!!
Joined: 28 Oct 2008
Posts: 6360
Location: S E Queensland, Australia
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| Posted: Tue Sep 20, 2011 8:22 am Post subject: |
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| Bugsy wrote: | It's coming along, Bernie.
I hope it will be finished in time for STISS!
Phil |
Do you plan on taking it home with you???
Now that the tracks are sorted I can work out the height of the "steer wheel"
To do that I have to add a bit more chassis rail, first job was to drill the holes in the plate (joiner).
I like to drill first, then cut to size, it's much easier then trying to drill/hold a small piece of metal in the drill press, remember your hands are not a vice.
The joiners were cut in the old hacksaw, then the holes were transposed to the channel.
I then tapped the thread in the joiner and fixed the extension to it.
Next step was to set the "extension" up square for marking the holes in the main chassis.
I did learn that you have to tap a thread in a hole before you can screw a bolt into it   , but it worked out OK.
The overall looks OK too.
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BK (Bernie)
If it aint broke, don't fix it. |
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verithingeoff
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Joined: 28 May 2009
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Location: Sunshine Coast, Qld, Australia
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Bugsy
Steam Supreme Being
Joined: 28 Jan 2009
Posts: 11106
Location: Sala, Sweden
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| Posted: Tue Sep 20, 2011 11:22 am Post subject: |
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| BK wrote: | | Bugsy wrote: | It's coming along, Bernie.
I hope it will be finished in time for STISS!
Phil |
Do you plan on taking it home with you???
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Yes, of course!
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Phil |
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steamtrack
Steam fanatic
Joined: 03 Nov 2010
Posts: 1479
Location: Hertfordshire uk
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| Posted: Tue Sep 20, 2011 7:05 pm Post subject: |
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Great stuff Bernie 
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MrMamod
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Joined: 03 Jan 2010
Posts: 16411
Location: hereford
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| Posted: Tue Sep 20, 2011 7:55 pm Post subject: |
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Bernie you just amaze with the ideas you come up with BUT you then put this into practise and i am sure this will turn out yet another amazing machine 
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BK
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Joined: 28 Oct 2008
Posts: 6360
Location: S E Queensland, Australia
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| Posted: Fri Sep 23, 2011 3:24 am Post subject: |
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Now that the tracks are done I've been assembling the beast again, got the gears set and running smoothly.
Next step is the chain (bit like sight glass, we don't see eye to eye).
I've had a length of new chain here for some time so I attacked it (without puncturing myself), got it fitted and it looks good.
But, it jumps/slips on the bottom sprocket, if I take another link out, it's too short.
Do I need an idler sprocket to take the slack out???
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BK (Bernie)
If it aint broke, don't fix it. |
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Dean W
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Joined: 28 Jul 2010
Posts: 6271
Location: N. Idaho, USA
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| Posted: Fri Sep 23, 2011 3:56 am Post subject: |
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You did a great job getting all the gearing lined up, Bernie. I would try an idler there. I don't think it even needs
to be a toothed idler. Just a roller should work to tension the chain a little. Maybe make it adjustable, or spring loaded.
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Dean Williams
http://www.deansphotographica.com/machining/projects/projects.html
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Bugsy
Steam Supreme Being
Joined: 28 Jan 2009
Posts: 11106
Location: Sala, Sweden
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| Posted: Fri Sep 23, 2011 5:21 am Post subject: |
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Yes, what Dean said!
Lookin' great, Bernie!
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Phil |
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Les
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Joined: 03 Nov 2007
Posts: 43150
Location: Bournemouth, Dorset, England.
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| Posted: Fri Sep 23, 2011 5:24 am Post subject: |
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Is there any wear in the bottom sprocket that would cause it to slip?
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BK
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Joined: 28 Oct 2008
Posts: 6360
Location: S E Queensland, Australia
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| Posted: Fri Sep 23, 2011 6:48 am Post subject: |
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| Les wrote: | | Is there any wear in the bottom sprocket that would cause it to slip? |
No Les, both new.
I've put a query in the meccano section, so I might get some expert advice.
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BK (Bernie)
If it aint broke, don't fix it. |
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scorpion2nz
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Joined: 27 Apr 2008
Posts: 5681
Location: Hawkes Bay NZ
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| Posted: Fri Sep 23, 2011 7:26 am Post subject: |
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I commented there and will do so here
I think you need a idler pulley with raised sides |
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Roly Williams
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Joined: 02 Aug 2006
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Location: Lambourn, Berks.
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| Posted: Fri Sep 23, 2011 7:38 am Post subject: |
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An idler would certainly work. It would need to be solid but adjustable. A spring loaded one wouldn't work in reverse. The other alternative would be to shift one of the two shafts slightly. It wouldn't need much.
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Roly Williams
"Opportunity is missed by most people, mainly because it is dressed in overalls and looks like work" (Thomas Alva Edison) |
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flywheel61
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Joined: 12 Nov 2006
Posts: 7093
Location: "On The Road", around Australia
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| Posted: Fri Sep 23, 2011 8:33 am Post subject: |
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That's looking great mate, what about a rubber friction wheel, rather than a pulley?
Cheers
Chris |
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DouglasC
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Joined: 21 Apr 2009
Posts: 119
Location: Scotland/Ireland
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| Posted: Fri Sep 23, 2011 7:35 pm Post subject: |
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This is a common problem with chain drive, particularly if, like this one it is a long chain. Also the chain will tend to stretch a little after use.
It definitely needs an idler, which can be done using a small Meccano sprocket wheel running free on a short axle or pivot bolt attached to a strip, which in turn is attached to the chassis.
I'm not sure why Roly says a spring loaded one will not work in reverse. I've not had problems with this.
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