Author Topic: Fork Leg Remedial Fix  (Read 1149 times)

Offline Joolstacho

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Re: Fork Leg Remedial Fix
« Reply #30 on: 20.10. 2022 02:00 »
R, I don't know if it's the same size tubing as BSA, I should be able to check,- out in the workshop -I think it's called 'cold drawn seamless tubing'.
And I think it's used for hydraulic rams on heavy machinery nowadays. Obviously the inner diameter needs to be close to perfect.
And I don't know how the top and bottom lugs are attached on a BSA - perhaps brazed? My guess is that Velocette would have used soft solder for low temperature therefore no distortion.
I got it from Criterion Engineers in England. I'll get back to you mate.

Offline Joolstacho

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Re: Fork Leg Remedial Fix
« Reply #31 on: 20.10. 2022 02:30 »
Richard. It's Criterion (Engineers), Greenoak, Bishopstone, Swindon, Wilts. I've forgotten the contact's name, sorry, but I could probably track him down via the Velo Club.

Measurements - (I get - metric) Stanchion OD : BSA 34.56, (below stepped section)  Velo 31.4.
Slider OD BSA 41mm,  Velo 38.2
Slider ID  BSA 37.53,  Velo 34.7 (approx)

All measurements approximate and subject to confirmation!

-Jools

Online RichardL

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Re: Fork Leg Remedial Fix
« Reply #32 on: 27.11. 2022 05:07 »
Rarely seen in the wild.

Richard L.
Plan on signing up for the world-wide 2020 DISTINGUISHED GENTLEMAN'S RIDEon September 27, 2020. This year it's a solo or pillion ride in dapper attire. Watch website at https://www.gentlemansride.com for details.


Offline Joolstacho

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Re: Fork Leg Remedial Fix
« Reply #33 on: 27.11. 2022 05:30 »
Aha! all you need now is a wild unworn slider...

Online RichardL

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Re: Fork Leg Remedial Fix
« Reply #34 on: 27.11. 2022 05:58 »
Jools,

I talked to Stuart regarding new BSA slider tubes. He can't help there, but was helpful with some process info. I'm calling him again on Monday regarding using DOM, which I can find, vs. CDS, which I cannot. Any opinions on that?

Richard L.
Plan on signing up for the world-wide 2020 DISTINGUISHED GENTLEMAN'S RIDEon September 27, 2020. This year it's a solo or pillion ride in dapper attire. Watch website at https://www.gentlemansride.com for details.


Offline Joolstacho

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Re: Fork Leg Remedial Fix
« Reply #35 on: 27.11. 2022 06:44 »
Richard, CDS I get (Cold Drawn Seamless) But DOM? sorry, my command of acronyms started to decline with DOS !  *razz*
I do think that tubing used for hydraulic rams etc is the thing.

Online RichardL

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Re: Fork Leg Remedial Fix
« Reply #36 on: 27.11. 2022 07:02 »
DOM is welded, cold drawn over mandrel. I understand what you mean about hydraulic cylinders, but I am thinking our fork legs don't have to endure comparable forces.

Richard L.
Plan on signing up for the world-wide 2020 DISTINGUISHED GENTLEMAN'S RIDEon September 27, 2020. This year it's a solo or pillion ride in dapper attire. Watch website at https://www.gentlemansride.com for details.


Offline Joolstacho

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Re: Fork Leg Remedial Fix
« Reply #37 on: 27.11. 2022 07:19 »
True Richard, but they do have to have dead smooth and dimensionally accurate I.D. eh. Perhaps not as perfect as hydraulic rams though, we're dealing with sliding bushes, not hydraulic pistons.
Are the tubes brazed to the lugs? Maybe silver solder? The Velo can use soft solder (Roofers or lead solder we call it down here, not the electrical type) because there's a much longer fitting overlap, something like 40mm from memory.
(So DOM is Drawn Over Mandrel - goddit!)

Online RichardL

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Re: Fork Leg Remedial Fix
« Reply #38 on: 12.12. 2022 23:49 »
What! you're still talking about this?!

Here is a sweet little photo of the family gathered for the holidays and a photo of Cousin Tubey, the Elder. I don't believe there will be a Cousin Tubey Jr. in the near future, as the cost to implement that relationship in material, machining, welding and painting is likely above $250. Each of the bits was an RPA to extract from Tubey and cleanup. However, regardless of all the time and money already in it (a lot of learning time, hard labor, oxy-acetylene cost, etc.) I've opted for the best used part I could find, and that wasn't cheap, either.  I figure it offers the best possibility for riding in early spring (though, I've never heard of a fork leg controlling the weather).

Richard L
Plan on signing up for the world-wide 2020 DISTINGUISHED GENTLEMAN'S RIDEon September 27, 2020. This year it's a solo or pillion ride in dapper attire. Watch website at https://www.gentlemansride.com for details.


Offline Joolstacho

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Re: Fork Leg Remedial Fix
« Reply #39 on: 13.12. 2022 01:04 »
Richard, as we know, cooling is a very good thing, but perhaps cousin Tubey has taken it a bit far?

Online RichardL

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Re: Fork Leg Remedial Fix
« Reply #40 on: 13.12. 2022 04:56 »
The fastest way to a bracketectomy.

Richard L.
Plan on signing up for the world-wide 2020 DISTINGUISHED GENTLEMAN'S RIDEon September 27, 2020. This year it's a solo or pillion ride in dapper attire. Watch website at https://www.gentlemansride.com for details.


Offline Joolstacho

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Re: Fork Leg Remedial Fix
« Reply #41 on: 13.12. 2022 05:56 »
Eeeek! That sounds painful mate!