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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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Coupling shafts....
Awl --
So ahm hard at work on m'bicycle generator, and I need to couiple the shaft (on bearings) driven by the bike wheel, to the shaft on the generator/motor. Some might say, Well, why not just drive the generator directly by the wheel, and the reason is the bearing-unfriendly nature of cantilivered stresses. So the driven shaft is well-supported for the load (a bearing on either end of the shaft), and the generator shaft is thusly fairly stress-free. The Q is, how to attach them. I see in MSC a bunch of types of love-joy-esque couplings, with the typical "finger-laced" coupling I am familiar with being called their "three piece jaw coupling", which is two hubs with a floating "spider" that kind of links the two hubs. It's also among the cheapest coupling methods. Are there better methods? I see a "flexible grid coupling", which basically looks like a piece of hose. Where do universal joints fit into this scheme? I'll be able to align the generator shaft with the drive shaft pretty accurately (eye-accurate), with nuts/threaded rod standoffs. But not accurate enough for solid-style couplings. Opinions on the best way to go -- and with the least drama? -- EA |
#2
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Coupling shafts....
"Existential Angst" wrote in message ... Awl -- So ahm hard at work on m'bicycle generator, and I need to couiple the shaft (on bearings) driven by the bike wheel, to the shaft on the generator/motor. Some might say, Well, why not just drive the generator directly by the wheel, and the reason is the bearing-unfriendly nature of cantilivered stresses. So the driven shaft is well-supported for the load (a bearing on either end of the shaft), and the generator shaft is thusly fairly stress-free. The Q is, how to attach them. I see in MSC a bunch of types of love-joy-esque couplings, with the typical "finger-laced" coupling I am familiar with being called their "three piece jaw coupling", which is two hubs with a floating "spider" that kind of links the two hubs. It's also among the cheapest coupling methods. Are there better methods? I see a "flexible grid coupling", which basically looks like a piece of hose. Where do universal joints fit into this scheme? I'll be able to align the generator shaft with the drive shaft pretty accurately (eye-accurate), with nuts/threaded rod standoffs. But not accurate enough for solid-style couplings. Opinions on the best way to go -- and with the least drama? -- EA Are you going to get enough RPM with direct drive? |
#3
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Coupling shafts....
"Tom Gardner" w@w wrote in message
... "Existential Angst" wrote in message ... Awl -- So ahm hard at work on m'bicycle generator, and I need to couiple the shaft (on bearings) driven by the bike wheel, to the shaft on the generator/motor. Some might say, Well, why not just drive the generator directly by the wheel, and the reason is the bearing-unfriendly nature of cantilivered stresses. So the driven shaft is well-supported for the load (a bearing on either end of the shaft), and the generator shaft is thusly fairly stress-free. The Q is, how to attach them. I see in MSC a bunch of types of love-joy-esque couplings, with the typical "finger-laced" coupling I am familiar with being called their "three piece jaw coupling", which is two hubs with a floating "spider" that kind of links the two hubs. It's also among the cheapest coupling methods. Are there better methods? I see a "flexible grid coupling", which basically looks like a piece of hose. Where do universal joints fit into this scheme? I'll be able to align the generator shaft with the drive shaft pretty accurately (eye-accurate), with nuts/threaded rod standoffs. But not accurate enough for solid-style couplings. Opinions on the best way to go -- and with the least drama? -- EA Are you going to get enough RPM with direct drive? Oh yeah.... haven't done the calcs, but 3,000 rpm seems easily achieved, judging from the voltage output. -- EA |
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