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#1
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Give me inertia or give me death (what the heck, give me both...)
I've thrown a few pictures of my modified Minoura HyperMag trainer up at
http://members.shaw.ca/ralph.barone/...e%20stuff.html |
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#2
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Give me inertia or give me death (what the heck, give me both...)
On Jan 24, 11:47*pm, Ralph Barone wrote:
I've thrown a few pictures of my modified Minoura HyperMag trainer up at http://members.shaw.ca/ralph.barone/...e%20stuff.html Ralph, How did you figure out exactly where to drill...if you care to explain to me your balancing procedure. They do this kind of stuff on turbocompressor impellers, but I never cared to find out how (probably much more sophisticated techniques) Ron http://cozybeehive.blogspot.com |
#3
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Give me inertia or give me death (what the heck, give me both...)
On Jan 24, 11:47*pm, Ralph Barone wrote:
I've thrown a few pictures of my modified Minoura HyperMag trainer up at http://members.shaw.ca/ralph.barone/...e%20stuff.html Ralph, That last picture (front view) looks great... thats a massive wheel. I'm not sure what the radius is but I'm sure you already have figured it out. Just for the records anyway check this link out for the math : http://www.engineeringtoolbox.com/fl...rgy-d_945.html You probably just wanted to have fun and do something with that "crap" trainer. If I were you, I'd just sell that, and get a new Kurt Kinetic. They already beat you to the flywheel game, with a massive 18 pounder on the shelves now. Besides, you can change flywheels pretty easily. My two cents. Ron http://cozybeehive.blogspot.com |
#4
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Give me inertia or give me death (what the heck, give me both...)
"Ron George" wrote in message ... On Jan 24, 11:47 pm, Ralph Barone wrote: I've thrown a few pictures of my modified Minoura HyperMag trainer up at http://members.shaw.ca/ralph.barone/...e%20stuff.html Ralph, How did you figure out exactly where to drill...if you care to explain to me your balancing procedure. They do this kind of stuff on turbocompressor impellers, but I never cared to find out how (probably much more sophisticated techniques) I would think the heavy spot would come to rest at the bottom. It's doubtful that lateral imbalance would be a problem on something as uniformly constructed and as narrow as this disc. IMO eccentricity would be the main cause of imbalance. Phil H |
#5
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Give me inertia or give me death (what the heck, give me both...)
In article
, Ron George wrote: On Jan 24, 11:47*pm, Ralph Barone wrote: I've thrown a few pictures of my modified Minoura HyperMag trainer up at http://members.shaw.ca/ralph.barone/...e%20stuff.html Ralph, That last picture (front view) looks great... thats a massive wheel. I'm not sure what the radius is but I'm sure you already have figured it out. Just for the records anyway check this link out for the math : http://www.engineeringtoolbox.com/fl...rgy-d_945.html You probably just wanted to have fun and do something with that "crap" trainer. If I were you, I'd just sell that, and get a new Kurt Kinetic. They already beat you to the flywheel game, with a massive 18 pounder on the shelves now. Besides, you can change flywheels pretty easily. My two cents. Ron http://cozybeehive.blogspot.com Thanks for the comments. Actually, I was too cheap to buy the Kurt Kinetic Road machine, so I just improvised what I could on my self-imposed $40 budget. Interestingly enough, (and as you can also figure out from the link you posted), it's not just the mass of the flywheel, but also the ratio of the flywheel diameter to the roller diameter that determines how much mechanical energy is stored at a given speed. I think I calculated that my 10", 11 lb flywheel, coupled to a slightly smaller roller, was at least as effective as the road machine's 18 lb flywheel. I also calculated that neither one gave as much inertia as me trying to push my fat ass down the road either. |
#6
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Give me inertia or give me death (what the heck, give me both...)
In article
, Ron George wrote: On Jan 24, 11:47*pm, Ralph Barone wrote: I've thrown a few pictures of my modified Minoura HyperMag trainer up at http://members.shaw.ca/ralph.barone/...e%20stuff.html Ralph, How did you figure out exactly where to drill...if you care to explain to me your balancing procedure. They do this kind of stuff on turbocompressor impellers, but I never cared to find out how (probably much more sophisticated techniques) Ron http://cozybeehive.blogspot.com Balancing isn't too hard to start off with. Spin the flywheel, and if it consistently stops in the same position, drill a hole at the bottom to remove some mass (the heaviest bit sinks to the bottom, n'est pas?). Repeat... If the balance point starts flip-flopping, then you're removing too much mass, so switch to a smaller drill bit. In the end, the bearings in the trainer had too much friction, so I put an axle through the flywheel and sat it on a pair of parallel surfaces. Doing that got the balance almost good enough (it still buzzes a bit at certain speeds). If you were balancing a turbocompressor, you would use the same basic idea, but you would use MUCH better instrumentation and you would also ensure that it was also balanced across the length of the shaft (look up dynamic balancing). |
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