Quote:
Originally Posted by Sperkowsky
We dont know the exact diameter for the pulley yet. What is better a larger pulley or a smaller one?
We could move to a second cim as we have dozens laying around. The issue is gear boxes. We have 2 BaneBots 27:1 gearboxes laying around with cims already on them which is a large reason we just decided to use one of them.
Webbing is fabric woven as a flat strip or tube of varying width and fibres often used in place of rope. Its mainly used for fastening loads on flat bed trucks.
Also, I would love the cad for the stabilizer you can email it to me at sperkowsky@bethpageeagles.ws or just PM it to me what ever is eaisser |
The ratio you use is dependent upon the pulley. For example, if you spin a shaft at 10rps (600rpm) and you have a 1" diameter pulley on it, then your speed will be:
10rps * pi * 1" diameter = 31.4"/second, because you spin it 10 times per second, and each rotation is 3.14".
With a 2" pulley, the speed doubles to 62.8"/sec. This does not account for the wrapping of the belt, dynamically enlarging the pulley.
The JVN calculator will do a lot of math for you, using it could really help you.
According to JVN calc, assuming a 200lb load (accounting for friction), and a 27:1 gearbox, a 2.5" pulley and one cim gives you a loaded elevator speed of 19"/second, or 26"/sec unloaded, and draws 59 amps loaded. I assume you're not using a brake on the elevator, so the cim also has to hold the load up. If you use 2 cims, each one only draws 31 amps, which might be ok (not sure on this). Remember that your belting will add diameter, so going with a smaller 1.5" pulley or something might have to be done.
I don't know if either of those situations are permissible for cims to hold up under the constant load of suspending the stack.
That kind of belting will probably work fine strength-wise, but check that. The diameter increasing business issue is not ideal, but using a larger pulley will mean that the diameter will increase less %-wise per rotation.
Decreasing toolpaths will really help, especially for a machine like a waterjet. Using less heavy lightening patterns, like 192's 2014 gearbox, instead of heavy lightening patterns, like 254's gearboxes, will greatly help this. 192 went with 3/16" plate IIRC instead of 1/4", so they only paid a small price in weight.