Retrobike Forum Index

It is currently Tue Dec 06, 2016 9:38 am

* Login   * Register * Search  * FAQ



Post new topic Reply to topic  [ 65 posts ]  Go to page Previous  1, 2, 3, 4, 5, 6, 7  Next
Author Message
 Post subject:
PostPosted: Sat Nov 05, 2011 7:09 pm 
retrobike rider
retrobike rider
User avatar

Joined: Fri Nov 11, 2005 10:58 am
Posts: 972
Si any more updates?


Top
 Profile  
 
 Post subject:
PostPosted: Sun Nov 06, 2011 7:07 am 
Gold Trader / MacRetro rider
Gold Trader / MacRetro rider
User avatar

Joined: Sun May 25, 2008 11:03 am
Posts: 18212
Location: Sunny Glasgow
Meant to ask. Do you intend to stamp the frame? Number,makers logo :?


Top
 Profile  
 
 Post subject:
PostPosted: Sun Nov 06, 2011 7:02 pm 
MacRetro rider
MacRetro rider
User avatar

Joined: Sat Jan 05, 2008 11:58 pm
Posts: 4434
Location: Third stone from the sun.
Stunning work Si, those welds are lovely 8)


Top
 Profile  
 
 Post subject:
PostPosted: Mon Nov 07, 2011 9:30 pm 
Gold Trader / MacRetro rider
Gold Trader / MacRetro rider

Joined: Sun Sep 04, 2011 11:33 am
Posts: 3097
Location: Riding my Woodsie.
Dr S wrote:
Image

Some folk add faux fillets to hide crappy welds. I just want to show you that these welds are pretty neat. Almost a shame to cover them up actually.

Si


Very neat welds indeed. 8)
Can I ask why you are welding then faux filleting rather than just filleting?
Is it a strength thing, an ease of construction thing, some other thing?

Loving this thread and looking forward to your updates. :D


Top
 Profile  
 
 Post subject:
PostPosted: Tue Nov 08, 2011 10:23 am 
retrobike rider / Gold Trader
retrobike rider / Gold Trader

Joined: Mon Oct 15, 2007 9:05 pm
Posts: 9245
Hi. Good question.
Couple of reasons.
Firstly for extra strength.
the main tubes are Reynolds 853. It's an air hardening tubeset and brazing doesn't get the tube ends hot enough to get the process going. Brazing is in the 800-900 deg range and TIG is 1500 deg range. the tubing needs to get to 1400 deg minimum to get the extra strength.
Secondly, the fillet will help dissipate stresses further along the joint and prevent cracks forming along the scales of the TIG welds- the most common starting point for a joint failure. The small scales of the welds can act as a stress raiser. My background is automotive- mainly race cars and this is where i've seen problems in the past. I suppose its different from what most frame builders think but i'm just applying 20 years of experience from other sectors to make sure my frames are strong enough.
Finally, i love the oldschool looks of a fillet brazed joint. Yes there is a slight weight penalty, but I'm not a weenie. I want something that will ride well for years to come. i won't compromise this just for the sake of a few grams here and there.
Incidentally, true temper (who i use for my seat stays) did lots of destruction testing on joints joined by braze, tig and a combination of both and the tig joints always failed first, and the the joint always broke. the brazed and braze over Tig joints lasted longer and the tube distorted around the joints but didn't snap- in other words, if this type of joint fails, you still get to ride home and keep your teeth!

cheers
Si


Top
 Profile  
 
 Post subject:
PostPosted: Tue Nov 08, 2011 10:29 am 
retrobike rider / Gold Trader
retrobike rider / Gold Trader

Joined: Mon Oct 15, 2007 9:05 pm
Posts: 9245
toons wrote:
Si any more updates?


Just a few pics. reamed the set tube and head tube yesterday so its all ready for paint. Fork is also finished. Fork was hard to build. I need to go back to the drawing board and re-design my fork jig to hold everything in place better than my current fixture- fitting the disc tab in the right place was a headache!. I can also make the segmented forks that i love too. Still it turned out nice and straight.



A few pics

Image

Image

Image

Sorry about the crap phone pics


Top
 Profile  
 
 Post subject:
PostPosted: Tue Nov 08, 2011 10:31 am 
Gold Trader / MacRetro rider
Gold Trader / MacRetro rider
User avatar

Joined: Wed Aug 22, 2007 12:23 am
Posts: 15608
Top post Si, every day is a school day :)


Top
 Profile  
 
 Post subject:
PostPosted: Tue Nov 08, 2011 7:22 pm 
Gold Trader / MacRetro rider
Gold Trader / MacRetro rider

Joined: Sun Sep 04, 2011 11:33 am
Posts: 3097
Location: Riding my Woodsie.
Dr S wrote:
Hi. Good question.
Si


Thanks for the comprehensive answer. :D


Top
 Profile  
 
 Post subject:
PostPosted: Wed Nov 09, 2011 5:20 pm 
retrobike rider / Gold Trader
retrobike rider / Gold Trader
User avatar

Joined: Fri Feb 06, 2009 11:13 pm
Posts: 9719
Location: Skipton
That's super sweet Si. I can see many PM's coming your way offering $$$ for frame builds!


Top
 Profile  
 
 Post subject:
PostPosted: Wed Nov 09, 2011 6:49 pm 
Moderator /Lincs, E & S Yorks Deputy AEC
Moderator /Lincs, E & S Yorks Deputy AEC
User avatar

Joined: Mon Nov 26, 2007 6:16 pm
Posts: 4144
Location: RetroModding™ since 1988
brocklanders023 wrote:
That's super sweet Si. I can see many PM's coming your way offering $$$ for frame builds!
Been there, done that ;)

Nice to see a work in progress, saves me asking for pics!

I would recommend trying to get some really nice pics of your work Si, even though the pics you have posted look great a much better pic will really help show your work in much better clarity and detail, your work deserves to be shown in the best way possible


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 65 posts ]  Go to page Previous  1, 2, 3, 4, 5, 6, 7  Next

All times are UTC [ DST ]


Who is online

Users browsing this forum: No registered users and 9 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

About Us

Follow Retrobike

Other cool stuff

All content © 2005-2015 Retrobike unless otherwise stated.
Cookies Policy.
bikedeals - the best bike deals in one place
FatCOGS - Fat Chance Owner's Group

Powered by phpBB® Forum Software © phpBB Group