Cottered cranks -- making me nervous!
01-17-09 | 06:42 PM
#51
Senior Member
Joined: Jul 2005
Posts: 849
Likes: 3
From: Dutchess County, NY
Bikes: Fuji S-12s, Trek Navigator 200, Dahon Vitesse D7, Raleigh Sprite Touring ('70's)
Being a tool guy who often 'rolls his own' (last one was a rivnut set tool make by modifying a poprivet gun), I set out to make a cotter remover today. Took a C clamp, drilled a 10mm hole in the foot for the cotter to pop thru, replace the bar screw with a hardened bolt with a nice concave tip, and put it to the task.
Applied some CRC 5-56 to the cotter and let it work in. Three revolutions against the tip of the cotter and......... the cheap cast steel C clamp opened up into about 10 degrees less than a full C. Oh well. Note to self: skip the cheap tool table at the flee market next summer.
Wonder if I could machine tips for my 24" bolt cutter to emulate the Var tool? Or, Monday, I'll try an autoparts store for the ball joint splitter.
On the DL-1: By this time tomorrow I'll either be doing the happy dance, or just plain accepting it was too good to be true. The owner correctly identified her bike as having brakes actuated by rods and levers. Free to good home....
Applied some CRC 5-56 to the cotter and let it work in. Three revolutions against the tip of the cotter and......... the cheap cast steel C clamp opened up into about 10 degrees less than a full C. Oh well. Note to self: skip the cheap tool table at the flee market next summer.
Wonder if I could machine tips for my 24" bolt cutter to emulate the Var tool? Or, Monday, I'll try an autoparts store for the ball joint splitter.
On the DL-1: By this time tomorrow I'll either be doing the happy dance, or just plain accepting it was too good to be true. The owner correctly identified her bike as having brakes actuated by rods and levers. Free to good home....
01-17-09 | 07:43 PM
#52
Just get the $55 tool from Bikesmith Design. Trust me, you'll like it so much that you'll wish you had more cottered cranks to work on.
01-18-09 | 08:24 PM
#53
Senior Member
Joined: Jul 2005
Posts: 849
Likes: 3
From: Dutchess County, NY
Bikes: Fuji S-12s, Trek Navigator 200, Dahon Vitesse D7, Raleigh Sprite Touring ('70's)
What are the official steps & foot placement for the 'happy dance'? Maye lyrics to go along as well, containing the phrase "I didn't just get one Raleigh Tourist (DL-1), I got TWO"????
I'll post the details on a new thread called 'Some Assembly Required' when I get a chance. Amazing.... The only very slight disappointment is that they are both ladies frames ('69 & '74?? - hard to read this one). His and hers would have made the afternoon ever so sweet.
Oh, and a 3 speed '76 Sprite damn near identical to the 10 speed Sprite I already have. Same color!
Now I really need that cotter tool!
I'll post the details on a new thread called 'Some Assembly Required' when I get a chance. Amazing.... The only very slight disappointment is that they are both ladies frames ('69 & '74?? - hard to read this one). His and hers would have made the afternoon ever so sweet.
Oh, and a 3 speed '76 Sprite damn near identical to the 10 speed Sprite I already have. Same color!
Now I really need that cotter tool!
01-18-09 | 11:47 PM
#54
Senior Member
Joined: Aug 2005
Posts: 801
Likes: 29
From: Minneapolis, MN
26tpi is BSC British Standard Cycle. In most sizes this is a rather fine thread, intended to avoid loosening from vibration on cycles, motorized or not. Whitworth is a much coarser thread, similar to UNC with 55 degree threads vs, the 60 degree threads of the BSC.
01-20-09 | 11:50 AM
#55
Senior Member
Joined: Dec 2007
Posts: 622
Likes: 1
From: Boone NC USA
Bikes: Bianchi hybrid. Dunelt 3-sp. Raleigh basket case. Wanting a Roadster.
This is a common misconception, because Whitworth tools fit the nut and bolt hex sizes of 26 tpi fasteners.
26tpi is BSC British Standard Cycle. In most sizes this is a rather fine thread, intended to avoid loosening from vibration on cycles, motorized or not. Whitworth is a much coarser thread, similar to UNC with 55 degree threads vs, the 60 degree threads of the BSC.
26tpi is BSC British Standard Cycle. In most sizes this is a rather fine thread, intended to avoid loosening from vibration on cycles, motorized or not. Whitworth is a much coarser thread, similar to UNC with 55 degree threads vs, the 60 degree threads of the BSC.
01-21-09 | 12:27 PM
#56
Viscount
Joined: Jul 2007
Posts: 1,016
Likes: 3
From: Gloucester, England.
Bikes: Mercian, Viscount x2, Holdworth La Quelda, Gundle Trade Bike, Williams/Mercian Tourer, Itera,
"On, Monday, I'll try an autoparts store for the ball joint splitter."
I assure you that the BJ splitter is the cheapest and best option if you can do the minor improvement to it.
Its OK without the tweaking but better if you can do it
I assure you that the BJ splitter is the cheapest and best option if you can do the minor improvement to it.
Its OK without the tweaking but better if you can do it
