Posted: March 2, 2016 | Author: ninelittletubes | Filed under: Uncategorized | Tags: Balance bike, Brazing, brazing training, fabrication, frame building, framebuilding, how to make a balance bike, tube mitering, tube mitring, Wilkinson Cycles |
Hello again folks, excuses excuses. Last time it was a baby, this time it’s a new house keeping me out of the workshop. And a real fixer-upper at that:
I hope that skip comes soon..
I have made it into the workshop a little though. In response to customer enquiries the other week I made some trial cuts with titanium tubing with the Torch & File precision mitre cutters with outstanding results:
Thicker than bike tubing but I found this going cheap.
Dial in the RPM.
Minimum overhang from the collet block.
Lovely clean precision cut.
Also, Brompton Bicycle kindly let me use some of their folding bike tubes to make my son Tom a balance bike. I called it the “Brom Tom”. It made Tom’s first Christmas present a lot of fun.
Had to do this jigless with all the tricks I could think of.
My lucky boy got a pair of Reynolds 631 fork blades to fit the necessary wider crown.
I used the wheels, saddle and handlebar grips from a popular balance bike. It also gave me a rough idea of suitable geometry. Although, my upside-down curved main tube gives much more standover clearance and the sawn-off Brompton seat post is hella rigid!
I had fun making it although the extra ovalising and improvisational fixturing made it more difficult than I imagined. If I make more I’m jigging-up bigtime!
Of, course, it had to match the colour scheme of my Brompton folding bike!
Blog post filler alert!!
A few years back my then girlfriend asked me if I could fabricate an illuminated sign for a music and arts festival in steel box section. It had to be 4 metres high and break down into 3 pieces to fit into a Luton van. “Sure, no problem”. This was the first thing I had ever welded so I had to buy a cheap arc welder for the job. The sign was used for 4 consecutive years now so I can’t have done that bad a job and the girl is now my wife. Phew!
First welding job.
I miss my wife’s old workshop in Bermondsey. Now posh apartments!
I don’t only do rear triangles y’know! Looks like I got away with it!
Look, it didn’t break!
My wife Saga also recently designed a light installation for a house refurbishment in East London that she project managed. It was made from stainless steel tubing with thick copper and brass rings and tubes brazed on. I turned and drilled these parts on the lathe from round bar. The stainless tubing was fillet brazed with Fillet Pro silver and suspended from the ceiling half way along by bicycle chain to reflect the client’s passion for cycling. My mobile phone photography doesn’t do it justice, honest!
It looked nice in the kitchen.
Sorry I only had my phone to hand to take the pictures.
In between house renovations and moving to the new Brompton factory in Greenford, I’ve also started giving brazing lessons. My first student Tom cycled from Bracknell to Tottenham Hale and home again in a raining gale. Massive respect Tom! Well done for learning fast and doing some nice neat braze-ons and fillets. I think I learned a lot too!
That’s all for now folks. Bikes. Must make bikes. A little inspired by walking to the Bicycle Revolution exhibition at the Design Museum earlier today..
Posted: April 30, 2015 | Author: ninelittletubes | Filed under: Uncategorized | Tags: bike frame storage, bike workshop, brass brazing, Brazing, butt gauge, butted tubing, cast iron surface table, dropout, fork bender, fork blade bender, fork end, frame building, frame jig, framebuilding, gas fluxer |
Hello again, I’m sorry I haven’t posted anything for a while but I’ve been busy doing stuff like this at my new workshop:
I had a baby.
He should come in handy for those menial tasks..
Putting a horizontal mill together on top of a cast flypress stand. I’ll put a variable speed motor on it for tube mitring.
My gasfluxer. Very worthwhile bit of kit.
I made this brazing stand/workstand.
I made 2 bike frame peg rails. The headtubes slide over the pegs which are covered with pvc hose.
I cut all these tool slots on the Bridgeport mill out the back. We have a full machine shop on site.
I use this old jalopy bike when the canal path’s muddy.
I made this stainless bike for myself. Perhaps I’ll make more..
I bought a number 4 flypress on a stand. I want to use this to form chainstay dimples, among other things.
I’ve now got the first increased-offset Sputnik Tool frame jig. I had to get the Park workstand base to attach it to my home-made stand.
Amazing what you can do with a torch and some pound shop black spray paint.
Rick’s frame is in for me to make a matching fork. Sorry, I know I need to tidy up!
I improved my gas economiser. Now my torch can’t rotate. I wish it was cordless as it appears to be here, but I just swapped it out for my bigger one to braze the fork crown.
My good friend John made this fork blade bender. The form goes from a 5″ radius to a 15″ radius. This was all made on a manual Bridgeport mill. The most I did was a bit of deburring and helping to lift the huge rotary table.
Fork bender clamp. I’ve now adapted this to give clearance for mudguard eyes.
Fork bender roller. This part plays a pivotal role. Arf arf!
John put a long handle on the tool so that it’ll manage any fork blades with ease.
I have a few frame repairs in. Best to keep them high up out of harm’s way.
I had this “christmas tree” alignment gauge waterjet cut from stainless steel. It makes aligning a frame very easy. You zero the V onto the seat tube to check that the dropouts are centred and spaced correctly. I used London Waterjet’s finest cut.
£25 each to you…?
I silver brazed this little stainless spiggot on top of the threaded portion of my BB post.
It stops the top cap from falling on the table or the frame.
I found this old suspension bump stop on the road. I drilled a hole in it so it now makes the post a bit safer in case I slip and put it through my arm.
Rick’s fork will be my first use of my new bender..
Cleaning the inside of the fork blades.
Making the slotted sandpaper holder was time well spent.
Preparing the fork blades for brazing. I used an end mill to slot the blades in the Bridgeport. A radius is less prone to forming cracks so I file the fork ends to fit.
Fork end after brazing. I’ll soak off the flux and sand it up nicely.
More brazing to clean up.
This is the Paris Brest fork crown after brazing onto the steerer and a soak in the water tank. I gave it a little sanding and filing. It’ll get more love after the fork is made.
This is the rosebud heating tip that I use for fork crown/steerer brazing. It is fast!
This is the number 2 nozzle that I use for fork ends.
I milled a 3mm anti-rotation groove along the steerer threads.
I cleaned up any burrs with a thread repair file. Now the headset nut glides freely.
This steel rule that John has freaks me out…
Stay tuned for my next post for bender performance, laser-sintered titanium dropouts and more!
Posted: July 12, 2013 | Author: ninelittletubes | Filed under: Uncategorized | Tags: Brazing, brazing training, frame building, framebuilding |
So after about a year in production brazing at the Brompton factory I’d say may brazing quality was starting to ramp up considerably. I’m still nowhere near the quality of the top dogs in the factory but I’m confident that I’ll be doing clearcoat quality fairly consistently before too long.
I did some practice brazes the other week in the workshop with flux paste. As I’ve previously built my own frames with lugged BB shells, this is my first ever fillet brazed bottom bracket shell:
Didn’t go too badly, but I’ll be doing more practice.
The brazing that I do in my day job at Brompton has been really useful.
Last month a bunch of us from the factory took part in the British Heart Foundation London to Brighton ride with 29,000 other cyclists. And yes, I did get over Ditchling Beacon on my 2-speed Brompton without stopping. Just.
Also, my friend John, a lifetime engineer and machinist has offered to work with me as I start up as a frame builder, giving me use of the facilities at his factory to make jigs, etc. What a guy. Watch this space..