Hoffman Amplifiers Tube Amplifier Forum
Other Stuff => Other Topics => Topic started by: shooter on February 11, 2022, 05:14:54 pm
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I’m stuck, I can’t formulate a search string to get me where I want to be :BangHead:
I got this far (image). The left bottom pully is the driven 2 “ rated 1750RPM 5HP
I got the RPM’s down to 70 but I’m clueless on what the HP did, if anything.
Thanks
dave
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The HorsePower ideally stays exactly the same.
In practice every 10:1 of gearing will suck-off 5% to 50% of power as friction. High-ratio gearing is lossy and/or real costly. Yes, past 10:1 you may prefer 2-stage, as you have done to get 20:1. (Also to avoid 12-foot wheel and 45-foot belt.)
Car gears may be well-made and can be found cheaper than new. Two first-gear transmissions and a rear-axle run close to 70:1. There was even a production lawn-tractor which ran a belt to a box to a cut-down 1950 Plymouth axle.
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Thanks, was guessing it stayed the same but one of the hemisphere's wasn't havin it! :laugh:
so 5HP minus losses it is!
working toward substituting an electric motor driven water pump with a 4 stroke. I don't have the electric pump yet, planning stage!
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> substituting an electric motor driven water pump with a 4 stroke.
Engine?
A 5 horse utility engine is liable to be rated at 3600RPM. At 1800RPM it may be under 3 horses. Engines driving slow grunt-loads may need a lot of step-down. In fact historically this was part of the rush to Diesel-Electric drive on railroads. "Gearing down" with motor connections is less lossy than most gear systems.
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the engine is 8hp, currently on my snow thrower but it's a problem child, has been for 5yrs now. the water pump is driven by either a 1/4HP or 1/2HP electric, need to visit Lowes for conformation. It's an irrigation type, not a 30' well pumper so load should be minimum.
I do have a 2:1 gear head that I used for a elevator to haul 4X8 sheets up 2 stories when I did the barn roof.
Step-down is what keep hanging me on what HP did in my example. I know there is a force multiplier when stepping down, just not
what force.
i'm still paying off the laundry room remodel so it's be a couple months before I can put pieces together for testing to see what snags the real world has
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I know there is a force multiplier when stepping down, just not what force.
Look here
(https://i.imgur.com/3WBD1MJ.jpg)
if you use an rpm reductor (pulley or gear the difference stay on different friction) what you will obtain will be to move your load in a slower way, but then you will be able to move a higher load
ideally (if you leave friction from compute) if you use a 10:1 rpm reductor, you'll obtain to moltiply for 10 times the load, but at a 10 times lower speed (power stay always the same)
Franco
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thanks Franco, torque was the part I was getting hung up on.
if I freeze the water and slide it over ice the horse will be happy :laugh:
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if I freeze the water and slide it over ice the horse will be happy
:laugh: :laugh: :laugh: