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LeeW 
BHPC Member
Joined: 10 March 2005
Location: Grimsby
Status: Offline
Points: 2382
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 Posted: 02 May 2005 at 7:10pm |
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I know geroff bird was advertising race bikes which he was going to make a year or two ago, dont know if he ever did get any orders. It has going to include a GRP front fairing and fabric bodysock
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Current fleet: Milan SL MK2 #027, Fujin SL II, Beany!
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alexjrice
Visitor (regular)
Joined: 05 March 2005
Location: United Kingdom
Status: Offline
Points: 119
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Posted: 02 May 2005 at 10:27pm |
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But then that would fall into 'open' and have to compete against the streamliners surely?
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Pete Cox
Visitor (new)
Joined: 03 March 2005
Location: United Kingdom
Status: Offline
Points: 168
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Posted: 09 May 2005 at 8:52am |
Hiya
I've got plans for my Wyre you're welcome to. T45 Steel and fairly easy to jig. It seems to go OK. The weaknesses we've shown up are due to the muppet employed to stick it together deciding that he could improve on the plans (changes made without understanding why the details weerre done like that inthe first place!!!) and then overcooking the tubes something horrible!
Edited by Pete Cox
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Pete the Librarian
Grasshopper,VK2, Rubicon, Moulton AM ++
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alexjrice
Visitor (regular)
Joined: 05 March 2005
Location: United Kingdom
Status: Offline
Points: 119
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Posted: 09 May 2005 at 6:26pm |
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That would be handy as a reference, at the moment the biggest puzzler
is actually the dropouts at the back, so I'd be interested to see how
you tackled it. Have people had any success using road bike dropouts
despite the fairly drastic differences in construction? I might have to
invest in a milling machine as the milling slide on the lathe is a bit
of a pain to use for repeated operations.
It might be good to build a copy of a known good machine before I try
designing my own - at least that way I'll have a good base for any
future modifications and a proper lowracer to play with so I can get a
feel for what they're like.
Do you have them electronically, or are they paper only?
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gNick
BHPC Member
Joined: 22 February 2005
Status: Offline
Points: 1977
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Posted: 09 May 2005 at 7:30pm |
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If you are planning planar dropouts, far and away the cheapest and
easiest way to get them (assuming you don't use commercial ones) is to
get them laser cut for steel and titanium and waterjet cut for
aluminium (liquid aluminium is shiny and has a tendency to reflect the
laser back into itself).
For reference I had some dropouts done for the new Fish forks lasercut
out of 6mm steel plate with a 90deg fold and the the cutting out and
folding for 5 sets each of left and right came to about £80. Without
the bend they would have been a lot cheaper. I've also had quotes for
sprockets which are about £2 each for 5 off.
If you supply them with an electronic version of a CAD drawing (usually
as a DXF file) they copy directly from the drawing so the programming
time is minimal.
Also if you want fancy material it is nearly always cheaper to source
the material yourself - the cutters will otherwise charge you for the
handling of the surplus material.
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gNick
"I'm afraid it's definite, Mrs Banker - your son has bicycles"
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gNick
BHPC Member
Joined: 22 February 2005
Status: Offline
Points: 1977
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Posted: 09 May 2005 at 7:33pm |
 alexjrice wrote:
It might be good to build a copy of a known good machine before I try
designing my own - at least that way I'll have a good base for any
future modifications and a proper lowracer to play with so I can get a
feel for what they're like.
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Suggest coming along to a race where you can get a chance to try, measure, skin your knees etc..
If you want to try the Fish chassis give me a bell - it handles pretty
well and will certainly give you a feel for riding low down on a bike!
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gNick
"I'm afraid it's definite, Mrs Banker - your son has bicycles"
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alexjrice
Visitor (regular)
Joined: 05 March 2005
Location: United Kingdom
Status: Offline
Points: 119
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Posted: 10 May 2005 at 2:51am |
But fish has 'funny pedals'  . I'll come to a race as soon as I have a gap in my calendar, which will be darley moor in june.
It's not so much the manufacture of the dropouts but the design and how
to join them onto the rest of the bike such that they re not likely to
drop off at inopertune moments - it seems necessary to ovalise the
tubing fairly drasticaly to make a round tube fit neatly onto a flat
dropout, perhaps having a bend in the dropouts and butt jointing it is
the way to go. I'm sure i can come up with something.
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gNick
BHPC Member
Joined: 22 February 2005
Status: Offline
Points: 1977
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Posted: 10 May 2005 at 10:24am |
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Do you want a lift to DM?
The Fish is migrating over to a standard if rather short crankset - when I make the cranks...
Joining to the tube is the easy bit - doing it so you don't cause the
tube to fail is more interesting. Mind people have been joining
dropouts to tubes for the best part of a century and it isn't a major
failure point. Go look at stick bikes.
The forks on the new fish are made from plate with a 90deg bend at the
top. A hole is drilled through this and the fork blade is brazed in
here. This gives the chance to have different offsets on either side of
the fork without splaying the forklegs which would then interfere with
the rider's legs.
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gNick
"I'm afraid it's definite, Mrs Banker - your son has bicycles"
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Pete Cox
Visitor (new)
Joined: 03 March 2005
Location: United Kingdom
Status: Offline
Points: 168
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Posted: 11 May 2005 at 8:34am |
Checkout the dropouts available from framebuilding.com. I used a set of flexible angle mounts with a tightly triangulated rear end and Columbus tubing stays. All fitted very neatly.
Alex - The plans are paper only, but you're welcome to use them.
If you send me an emai;l address (private post) I can send pics of the bike as well.
Edited by Pete Cox
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Pete the Librarian
Grasshopper,VK2, Rubicon, Moulton AM ++
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alexjrice
Visitor (regular)
Joined: 05 March 2005
Location: United Kingdom
Status: Offline
Points: 119
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Posted: 12 May 2005 at 1:12pm |
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Aahhaa, I'd wondered about the variable angle jobbies but couldn't
quite figure out how they worked, no doubt all shall become clear once
I have perused The Plans. You should have a PM.
Nick, I've just realised that as is so often the case I'd like to be in
two geographically different places at the same time. Next week for
example I shall actually be in various exams, in fact I should much
rather be in a cave in prehistoric Islington. In this particlaur
instance I'd like to be a at Darley Moor, but at the same time I'd like
to be at the York Cycle Show. The logistics of this are somewhat
complicated so I'll have to get back to you.
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What would your ideal race bike be like?