Sprocket Wheel dimensions
Sprocket Wheel dimensions
(OP)
Hey, I'm looking at sprocket wheels and have come upon something I don't understand.
I'm looking at the European Standard and if I want a wheel for a 5/8'' simplex (15,875mm) roller chain with 16 teeth I can only use a diameter of 12mm.
I can't connect the wheel to a shaft bigger than 12mm??
Could someone explain to me why this is so?
I apologize if the question is silly.
I'm looking at the European Standard and if I want a wheel for a 5/8'' simplex (15,875mm) roller chain with 16 teeth I can only use a diameter of 12mm.
I can't connect the wheel to a shaft bigger than 12mm??
Could someone explain to me why this is so?
I apologize if the question is silly.





RE: Sprocket Wheel dimensions
Russell Giuliano
RE: Sprocket Wheel dimensions
The biggest diameter I can choose from my table is 30mm and that gives me an wheel diameter of almost 600mm! I can't use that.
What I'm basically trying to do is turn a shaft about 180 degrees using chaindrive. The shaft is 50mm in diameter and I can't use a wheel larger than about 110mm..
Does this mean that this kind of chain drive is out of the question, or are there some clever solutions to the problem?
Thanks alot for your time!
RE: Sprocket Wheel dimensions
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RE: Sprocket Wheel dimensions
What do you think?
Thanks again!
RE: Sprocket Wheel dimensions
RE: Sprocket Wheel dimensions
Kind of wierd that they didn't put max bore in the european one..
If I want my rotation to be somewhat accurate, are these kinds of chains a good choice? The rotation needs to happen within a second with an accuracy of about +/- 2 degrees. Are there perhaps other kinds of mechanisms I should consider?
Your help is greatly appretiated!
RE: Sprocket Wheel dimensions
http://www.camcoindex.com/default.htm
RE: Sprocket Wheel dimensions
The problem is that I only have 6 bar of air pressure to work with, so my actuator has to be pneumatic.
The other problem is that the shaft I want to rotate is horisontal, and my actuator "has" to be placed in a vertical fashion, so there most likely has to be some kind of transmission.
I won't bother you guys with my problems any more :)
Thanks alot for helping me out!
RE: Sprocket Wheel dimensions
RE: Sprocket Wheel dimensions
But, rotation accuracy is not a strong point of a chain drive. A 2 degree tolerance on a 16 tooth sprocket of that chain pitch works out to about 0.055" of movement. Depending how far apart the two shafts are, that might be marginal.
Industrial timing belt drives can be more accurate than chains if properly designed.
The accuracy of any belt or chain drive depends on how the tension is adjusted - you need the capability of adjusting the center distance between the shafts. Timing belts like having a certain amount of tension on them. Roller chains don't like it, they need a bit of slack (which implies inaccuracy). You can take up the slack with a spring loaded tensioner, they'll tolerate that, but not high tension at fixed center distances.
RE: Sprocket Wheel dimensions
dvd: currently I'm thinking about using a limit-switch that turns on a throttle. That's as far as I have come. How much throttling I will need and such, I have yet to discover.
By the way, I'm actually going to use some kind of pneumatic actuator as the "motor". A dobble rack and pinion actuator is currently the most attractive. Helical spline is also possible..
Thanks