Re: Bike Locks/security Thread...

Postby Conners on Fri 29/Apr/16 5:57pm

Wait - you mean all chains are not made to a custom number of links and are not only usable
for the custom length to which they were manufactured?

Well I'll be jiggered.
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Re: Bike Locks/security Thread...

Postby Wobbler on Fri 29/Apr/16 6:24pm

pfft dougal isnt even a chain manufacturing engineer what would he know
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Re: Bike Locks/security Thread...

Postby philstar on Fri 29/Apr/16 7:50pm

Conners wrote:Wait - you mean all chains are not made to a custom number of links and are not only usable
for the custom length to which they were manufactured?

Well I'll be jiggered.


while i don't think this is what is done, but it is possible to cut chain to length and then heat treated it to make it harder :p or some other similar process.
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Re: Bike Locks/security Thread...

Postby happybaboon on Fri 29/Apr/16 8:04pm

Everyone knows that the chain manufacturers have access to harder cutting discs than amateur small engineers. Big Chain is a massive conspiracy.
They're all like "Screw your diamond maing we have stuff that is at 20 on the Mohs hardness scale, bitches". They also have access to higher heats.

That's how unbreakable chains are made.
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Re: Bike Locks/security Thread...

Postby pokey on Fri 29/Apr/16 9:45pm

Velocipedestrian wrote:
happybaboon wrote:Dougal if the uncuttable steel arrives please video the cutting.

This is a derpy thread for derps.

Second this.

Except this is a fantastic throwback to the TALAS about it Gumby fest.


Funny thread, same tools, different subject. So how'd that jigless heat treatment theory workout Dougal?
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Re: Bike Locks/security Thread...

Postby Dougal on Fri 29/Apr/16 10:23pm

pokey wrote:So how'd that jigless heat treatment theory workout Dougal?


The what?
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Re: Bike Locks/security Thread...

Postby Velocipedestrian on Fri 29/Apr/16 10:36pm

Dougal wrote:
pokey wrote:So how'd that jigless heat treatment theory workout Dougal?


The what?

This

Dougal wrote:
Simonius_Titius wrote:But what if it twists? At the factory, aluminium frames often warp during heat treatment. A proportion of frames need to be straightened, which has to be done within X minutes of finishing heat treatment.

They warp despite the tubes being cut accurately, jigged accurately and welded by robots. Maybe it is to do with which side of the aluminium tube faces the sun when it is growing.


Warpage is mostly from stress relief at the first heat-treatment. My bike frame has already had that done so the only new stress to be releived will be around the head-tube. This is always a minor risk, but I'm not expecting problems.

If it does need tweaked straight after, then it'll be tweaked straight after.

danose wrote:or you could just ditch that silly antique turner and buy ANY of the modern horst link bikes - say a nice LaPierre, or even (shock horror) a specialized

a carbon zesty/spicy would run rings around a turner :satan:


Problem is, those guys don't make a bike that will do the trifecta of fitting a standard sized coil shock, having a 1.5" head-tube and 26" wheels. The only bike Specialized have in that category is the Status (which I might still get for a bigger test bike).
The Lapierres all have that silly extension bolted to the shock. I would waste a lot of time making those for each new shock I needed to test!

Cube made a suitable bike last year, but I'm not spending that much on an extra bike.

26" wheels are so you can bolt on and ride with 26, 27 or 29" forks. A 27" frame and wheel isn't safe with a 26" fork, fit a 26" front wheel and it all just gets steeper.
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Re: Bike Locks/security Thread...

Postby dwgknz on Sat 30/Apr/16 12:25am

Pokey = Gumby??
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Re: Bike Locks/security Thread...

Postby Wobbler on Sat 30/Apr/16 10:04am

Nope
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Re: Bike Locks/security Thread...

Postby Dougal on Sat 30/Apr/16 10:21am

Velocipedestrian wrote:
Dougal wrote:
pokey wrote:So how'd that jigless heat treatment theory workout Dougal?


The what?

This


Oh right, that.

I haven't done that particular job yet, but I have done the same before (weld repair with full T6 heat treat) on a FSR frame with no resulting alignment issues.
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Re: Bike Locks/security Thread...

Postby pokey on Sun 1/May/16 9:42am

I assume the 'I' in 'I have done' is someone else, who'd you use?
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Re: Bike Locks/security Thread...

Postby scatter on Sun 1/May/16 11:44am

pokey wrote:I assume the 'I' in 'I have done' is someone else, who'd you use?

A company called Engen I believe...
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Re: Bike Locks/security Thread...

Postby Scotty on Sun 1/May/16 12:30pm

Now that depends on whether Dougal was wearing his owners hat or not. :lol:

Now I'm no injuneer or reefer-roller, but I do know that D used to do things like finite element analysis in his spare time for a laugh.

The man knows a bit about this sort of thing. :rolleyes:
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Re: Bike Locks/security Thread...

Postby Scotty on Sun 1/May/16 12:32pm

pokey wrote:I assume the 'I' in 'I have done' is someone else, who'd you use?

You know what they say about assuming things...
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Re: Bike Locks/security Thread...

Postby Dougal on Sun 1/May/16 12:49pm

pokey wrote:I assume the 'I' in 'I have done' is someone else, who'd you use?


I used Heat Treatments Ltd in Auckland for the T6 treatment. I did the weld prep myself and paid a talented welder to do the welding. While I can weld steels quite well I haven't ever tried TIG welding aluminium and didn't want to practise on a bike frame.
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Member for: 14 years 6 months

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