Search found 28 matches

by joshua3
22 Aug 2016, 4:18pm
Forum: Bikes & Bits – Technical section
Topic: Raleigh Headset 26 tpi 1" steerer _ Help!
Replies: 33
Views: 2308

Re: Raleigh Headset 26 tpi 1" steerer _ Help!

Yes I can see handlebar loads acting on the steerer but these bending stresses (at the upper bearing) are tiny compared to those caused by the road acting on the steerer at the lower headset bearing.
by joshua3
22 Aug 2016, 4:12pm
Forum: Bikes & Bits – Technical section
Topic: Raleigh Headset 26 tpi 1" steerer _ Help!
Replies: 33
Views: 2308

Re: Raleigh Headset 26 tpi 1" steerer _ Help!

The steerer will see a shear reaction with my proposal, but very little bending.


Regards

James
by joshua3
22 Aug 2016, 3:58pm
Forum: Bikes & Bits – Technical section
Topic: Raleigh Headset 26 tpi 1" steerer _ Help!
Replies: 33
Views: 2308

Re: Raleigh Headset 26 tpi 1" steerer _ Help!

Where are these stresses occurring in the steerer? Are you modelling it as a simply supported beam cantilevered at the end where the wheel axle is? I am joining the steerers at the furthest support (from the load) so I fail to see where the bending loads are coming from.

Regards
james
by joshua3
22 Aug 2016, 3:21pm
Forum: Bikes & Bits – Technical section
Topic: Raleigh Headset 26 tpi 1" steerer _ Help!
Replies: 33
Views: 2308

Re: Raleigh Headset 26 tpi 1" steerer _ Help!

True Brucey, but the lower wishbones see significant bending loads and I have never seen any of these fail. Regarding a fatigue failure, if we were considering alloy tubes I would be in total agreement, but steel alloys which are subjected to a cyclic stress levels below the elastic limit rarely fai...
by joshua3
22 Aug 2016, 11:58am
Forum: Bikes & Bits – Technical section
Topic: Raleigh Headset 26 tpi 1" steerer _ Help!
Replies: 33
Views: 2308

Re: Raleigh Headset 26 tpi 1" steerer _ Help!

Thanks Brucey, I can't see what I am proposing would be any worse than this? I am going into this with my eyes open, I will definitely use your suggestion of the star nut beneath the insert tube also. I understand your concerns about stress concentrations and crack propagation, but having welded up ...
by joshua3
22 Aug 2016, 8:29am
Forum: Bikes & Bits – Technical section
Topic: Raleigh Headset 26 tpi 1" steerer _ Help!
Replies: 33
Views: 2308

Re: Raleigh Headset 26 tpi 1" steerer _ Help!

The mystery deeps. I decided to bite the bullet last night and have cut the threads off. I will weld on a length of 25.4mm and fit a threadless headset and ahead stem and spacers. I will use an insert at 22.2mm dia, drill and plug weld the lot together then weld the two steerers butted together. Thi...
by joshua3
19 Aug 2016, 7:38pm
Forum: Bikes & Bits – Technical section
Topic: Raleigh Headset 26 tpi 1" steerer _ Help!
Replies: 33
Views: 2308

Re: Raleigh Headset 26 tpi 1" steerer _ Help!

Looks like I might have found one, but for this price I think I'll pass lol!

http://www.ebay.co.uk/itm/Raleigh-Chopp ... Sw6n5XtLDR

James.
by joshua3
18 Aug 2016, 2:35pm
Forum: Bikes & Bits – Technical section
Topic: Raleigh Headset 26 tpi 1" steerer _ Help!
Replies: 33
Views: 2308

Re: Raleigh Headset 26 tpi 1" steerer _ Help!

Thanks again for the further information, good job it was out of stock then, else I might have bought that one lol.
by joshua3
18 Aug 2016, 2:34pm
Forum: Bikes & Bits – Technical section
Topic: Raleigh Headset 26 tpi 1" steerer _ Help!
Replies: 33
Views: 2308

Re: Raleigh Headset 26 tpi 1" steerer _ Help!

http://www.ebay.co.uk/itm/Etc-Threaded- ... rmvSB=true

Thanks for that, but I have already inquired, out of stock :-/
by joshua3
18 Aug 2016, 6:05am
Forum: Bikes & Bits – Technical section
Topic: Raleigh Headset 26 tpi 1" steerer _ Help!
Replies: 33
Views: 2308

Re: Raleigh Headset 26 tpi 1" steerer _ Help!

I have searched high and low online and can't find one lol.
Regards
by joshua3
17 Aug 2016, 10:18pm
Forum: Bikes & Bits – Technical section
Topic: Raleigh Headset 26 tpi 1" steerer _ Help!
Replies: 33
Views: 2308

Re: Raleigh Headset 26 tpi 1" steerer _ Help!

Thanks Brucey for taking the time to share such brilliant advice. You have given me a lot to digest, thanks very much.
James
by joshua3
17 Aug 2016, 8:21pm
Forum: Bikes & Bits – Technical section
Topic: Raleigh Headset 26 tpi 1" steerer _ Help!
Replies: 33
Views: 2308

Re: Raleigh Headset 26 tpi 1" steerer _ Help!

Thanks Mike, Unfortunately the threads are a bit iffy on the threaded parts and there is quite a lot of rust and pitting in the cups (if that is the right term) the fork steerer threads are ok though, just 26 tpi. I am toying with the idea of welding on a length of tube to the steerer and fitting a ...
by joshua3
17 Aug 2016, 2:46pm
Forum: Bikes & Bits – Technical section
Topic: Raleigh Headset 26 tpi 1" steerer _ Help!
Replies: 33
Views: 2308

Raleigh Headset 26 tpi 1" steerer _ Help!

Hello Everyone, I am new here, but I have been lurking for a long time, so I want to say hi to everyone before I ask my first question. :D I am trying to restore my Dads old bike for him as he has given up smoking and I am trying to encourage him to do something healthy! His bike needs a new headset...