set screws and bell cranks?
Posted: Thu Jan 09, 2014 12:34 pm
Hi All,
I'm beginning on a design to build my own pedal steel guitar. I've worked on a bunch of different ones and am now foolish enough to think I can build one too.
One of the things that bothers me is bell cranks. Some types seem prone to loosening or breaking over time. Some are much easier to work on like when you are asked to change a copedant or add something. A bell crank is a simple mechanical device, but there are many engineering choices and decisions that affect success.
I've learned that I think I don't care for set screws on round cross shafts with flats. But maybe I don't know enough about the proper design. I was wondering about clamping the bell crank to a shaft. Clamping to a square shaft ought to work using 2 screws one on each side of the shaft.
The trick may be in making the heads of the screws easily accessible. Things are usually pretty tight by the time you get very many rods in there.
Opinions? Links to discussions of bell cranks?
I'm beginning on a design to build my own pedal steel guitar. I've worked on a bunch of different ones and am now foolish enough to think I can build one too.
One of the things that bothers me is bell cranks. Some types seem prone to loosening or breaking over time. Some are much easier to work on like when you are asked to change a copedant or add something. A bell crank is a simple mechanical device, but there are many engineering choices and decisions that affect success.
I've learned that I think I don't care for set screws on round cross shafts with flats. But maybe I don't know enough about the proper design. I was wondering about clamping the bell crank to a shaft. Clamping to a square shaft ought to work using 2 screws one on each side of the shaft.
The trick may be in making the heads of the screws easily accessible. Things are usually pretty tight by the time you get very many rods in there.
Opinions? Links to discussions of bell cranks?