Hack saw and a gas bottle, whimsical bicycle project!

[andyf]

hat would give you 9 speeds, br. Might be simpler to make do with eight: http://www.sturmey-archer.com/products/hubs

Andy

[doubletop]

hat would give you 9 speeds, br. Might be simpler to make do with eight: http://www.sturmey-archer.com/products/hubs

Andy

Thanks for that, they've moved on in the 50years since I last had a bike with Sturmey Archer

Pete

[John Hill]

hat would give you 9 speeds, br. Might be simpler to make do with eight: http://www.sturmey-archer.com/products/hubs

Andy

Andy, I fear that new hub would break the $5 budget for this project!

[John Hill]

Been toying with the idea of a  3-speed Sturmey Archer with a 3 ring front de-railler on my roundtuit
electric trike, anyone got any thoughts?
br

I had been thinking about that too as I still have a workable front derailer!

[John Hill]

With the single speed thing that is going on at the moment the cyclists use these to convert their bikes.

http://www.torpedo7.co.nz/torpedo7/catalogindexsearch.do?org.apache.struts.taglib.html.TOKEN=eaa989514646d10378265c0486638e58&formAction=search&searchString=tensioner&brandString=

Of course it's got to be a DIY job with the bits you have

Pete

Pete, I have the tensioner from the busted derailer and I think even my shop skills would be adequate to mount it.

[doubletop]

Pete, I have the tensioner from the busted derailer and I think even my shop skills would be adequate to mount it.

John

That was the idea, I hadn't expected you to spend money, You are a Kiwi, the bits you have and some #8 and away you go, especially as we now know the front derailleur is working you at least have a 3 speed, albeit with somewhat wide spacing. The link was by way of inspiration.

Pete

[John Hill]

Been toying with the idea of a  3-speed Sturmey Archer with a 3 ring front de-railler on my roundtuit
electric trike, anyone got any thoughts?
br

If you are using the front derailer you will need to use the narrow derailer chain which will not fit the thick sprocket on the Wormy Starcher, no doubt there will be a solution to this, maybe even derailer sprockets will fit the hub, but it is something I still have to learn.

[doubletop]

If you are spending money it looks like they do a cassette version to take your existing cluster, look at CS-RF3. But why you'd want a 9 sprocket cassette on a three speed hub escapes me unless you want bragging rights for 81 gear ratios (9x3x3)

[Baldrocker]

John.
Another possible problem with using three sprocket front with single rear
could be chain alignment on changing sprockets, may have to mock-up to try the idea.
br

[John Hill]

On the road at last!


bakfietstest2 by aardvark_akubra, on Flickr


bakfietstest by aardvark_akubra, on Flickr

I decided to go for the Ye Olde look of the famous Raleigh Jungle Bike,  I had to make a couple of more trips to the tip to get the 'right' parts and I had to make adapters for the cottered crank to fit in the frame which had been made for a one piece cranks.  Eventually all the bits came together including the 3 speed Sturmy Archer hub which works very well.  The SA rear axle has a weird 13/32 26TPI thread and one nut was stripped so the next task is to find a suitable nut or get really keen and make a tap.

The caliper brakes are really poor, the frame has lugs for cantilever brakes on the rear but the brake blocks do not line up with the rim.

[Pete49]

John the thread for most bikes is a special thread, why I don't know.  On the oz ebay site there is a guy that sells the taps and dies at reasonable prices but again it would wreck your budget. Should be plenty bike bits at the tip
Nice job and got me thinking about a motorised version 
Pete

[John Hill]

Yes Pete, they called them 'cycle' threads!  The stripped one is even an oddity among them as 13/32 is bigger than the usual cycle axle.

[sbwhart]

Nice job John, 

I bet you get the job of fetching the weekly shop now.

 


That weard thread is a British Standard Brass thread you can still get the taps and dies, try Tracey tools http://www.tracytools.com/index.php?route=product/category&path=1_3   

I think they will ship to your neck of the woods

Stew

[John Hill]

Nice job John, 

I bet you get the job of fetching the weekly shop now.

 


That weard thread is a British Standard Brass thread you can still get the taps and dies, try Tracey tools http://www.tracytools.com/index.php?route=product/category&path=1_3   

I think they will ship to your neck of the woods

Stew

Brass thread you say Stew?  I will go and check my stock of weird brass bits!  Right now there is only a thin lock nut on one side and I would really like to get something stronger on there.

[Bluechip]

I doubt if it is Brass Thread assuming it's a genuine bicycle spindle ..

B S Cy is 26 tpi 60⁰ with rounded crests/ roots

B S B is 26 tpi 55^o WF

I have come across B S Cy in all sorts of wierd OD's .. on motor bikes ..  it's what they did ..  

Have a trawl in this ... BSCy or CEI ..

http://www.watchman.dsl.pipex.com/thread.html



Dave BC

[metalmad]

Thats fantastic
Pete

[John Hill]

I doubt if it is Brass Thread assuming it's a genuine bicycle spindle ..

B S Cy is 26 tpi 60⁰ with rounded crests/ roots

B S B is 26 tpi 55^o WF

I have come across B S Cy in all sorts of wierd OD's .. on motor bikes ..  it's what they did ..  

Have a trawl in this ... BSCy or CEI ..

http://www.watchman.dsl.pipex.com/thread.html



Dave BC

Fortunately I didnt find anything in my brass bits box,  if I cant get a nut I will have to make a tap.

[andyf]

John, the nuts can still be had in the UK and US - google "Sturmey Archer left axle nut". But shipping to NZ might not fit with the low-cost aspects of your project.

Would it not be simpler to screwcut a nut on the lathe than to screwcut, gash flutes and heat treat a tap?

Andy

[John Hill]

It would be easy Andy but I would have to first make a threading tool small enough for 13/32"    I am also a bit wary of making a nut that might mangle the axle threads.

I will be calling in to the local bike shop today, we are not usually compromised regarding parts for things like bicycles and he even managed to produce two crank cotters for me last week,  so fingers crossed.