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Clever Guys -- Here's one
Ok, so here's what I've been tasked to do
Build a system to produce smooth sinusoidal oscillations with a variable stroke of up to 8" and variable frequency up to 30hz. The driver required will be around 3 hp. since this is supposed to be running by the end of august, and there isn't time to machine all the necessary parts, my basic idea was to cannibalize an existing single cylinder engine and connect the drive shaft to a D/C or variable speed A/C . The arrangement will require a connecting rod as the thing that I am driving cannot sustain the side force. The stroke will be varied by allowing for different crank arm lengths. My question is. Where in tarnation do I find a single speed engine that might be a candidate? Any other ideas for doing this? Any help you can provide would be greatly appreciated. Thanks in advance, Andrew |
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#2
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Clever Guys -- Here's one
Andrew wrote:
---8---cut My question is. Where in tarnation do I find a single speed engine that might be a candidate? Any other ideas for doing this? Any help you can provide would be greatly appreciated. Thanks in advance, Andrew Cannibalise a lawnmower? /Robert |
#3
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Clever Guys -- Here's one
"Andrew" wrote in message om... Ok, so here's what I've been tasked to do Build a system to produce smooth sinusoidal oscillations with a variable stroke of up to 8" and variable frequency up to 30hz. The driver required will be around 3 hp. since this is supposed to be running by the end of august, and there isn't time to machine all the necessary parts, my basic idea was to cannibalize an existing single cylinder engine and connect the drive shaft to a D/C or variable speed A/C . The arrangement will require a connecting rod as the thing that I am driving cannot sustain the side force. The stroke will be varied by allowing for different crank arm lengths. My question is. Where in tarnation do I find a single speed engine that might be a candidate? Any other ideas for doing this? Any help you can provide would be greatly appreciated. Thanks in advance, Andrew I thought you said it had to be sinusoidal and variable stroke. A crankshaft is neither, although it approaches sinusoidal for infinite connecting rod length. How much money do you have? A big solenoid and a 2.2 kw driver? del cecchi |
#4
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Clever Guys -- Here's one
"Andrew" wrote in message om... Ok, so here's what I've been tasked to do Build a system to produce smooth sinusoidal oscillations with a variable stroke of up to 8" and variable frequency up to 30hz. The driver required will be around 3 hp. since this is supposed to be running by the end of august, and there isn't time to machine all the necessary parts, my basic idea was to cannibalize an existing single cylinder engine and connect the drive shaft to a D/C or variable speed A/C . The arrangement will require a connecting rod as the thing that I am driving cannot sustain the side force. The stroke will be varied by allowing for different crank arm lengths. My question is. Where in tarnation do I find a single speed engine that might be a candidate? Any other ideas for doing this? Any help you can provide would be greatly appreciated. Thanks in advance, Andrew Andrew, Balance will certainly be a problem at 30hz to deal with but here is an idea. Use a scrap yard two-stroke motorcycle engine with manual clutch and transmission. Turn the crankshaft through the countershaft (transmission)output sprocket. Using the dirtbike motor's flywheel as you output; mount a disk with a radial slot (or series of holes) milled to allow adjustment of your stroke. |
#5
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Clever Guys -- Here's one
"Del Cecchi" writes:
"Andrew" wrote in message om... Ok, so here's what I've been tasked to do Build a system to produce smooth sinusoidal oscillations with a variable stroke of up to 8" and variable frequency up to 30hz. The driver required will be around 3 hp. since this is supposed to be running by the end of august, and there isn't time to machine all the necessary parts, my basic idea was to cannibalize an existing single cylinder engine and connect the drive shaft to a D/C or variable speed A/C . The arrangement will require a connecting rod as the thing that I am driving cannot sustain the side force. The stroke will be varied by allowing for different crank arm lengths. My question is. Where in tarnation do I find a single speed engine that might be a candidate? Any other ideas for doing this? Any help you can provide would be greatly appreciated. Thanks in advance, Andrew I thought you said it had to be sinusoidal and variable stroke. A crankshaft is neither, although it approaches sinusoidal for infinite connecting rod length. If you don't have room for an infinite length connecting rod, an alternative is to use a connecting rod which changes its length once per revolution to counteract the distortion a regular connecting rod introduces. This is a trivial mechanism to implement if you can drive your connecting rod from the end, rather than the middle, of your shaft. At least some spinning type fishing reels, such as those made by shimano: http://tinyurl.com/5bxww use this sort of mechanism, which sort of brings me back on topic. |
#6
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Clever Guys -- Here's one
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