I Messed up, Let’s Test Efficiency Again...
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- Опубликовано: 21 апр 2018
- It's time for round 2 of compound planetary gears testing, will the results change? Will I screw up the procedure again? Will the results tell us anything? Lets find out!
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I understand nothing about gears. but this is interesting anyway. an idiots guide to gears would be great if you already did one?
someday, I may do that.
it only takes a tiny film of oil to make a 100% difference. plastic is sticky so when you make steel parts you will notice extreme efficiency over plastic.which also has a static magnatism
Correct me if I'm wrong but isn't this just testing the torque capacity of the gearboxes, not their efficiency? If one only ends up delivering 25% of the theoretical calculated torque (multiplying motor torque by the drive ratio) that doesn't mean it's 25% efficient. You could have another gearbox that loses the exact same amount of energy through the drive train yet is strong enough to deliver the full amount of torque.
Another way to think about it is if a much less powerful motor was used the gearbox wouldn't skip and it would deliver 100% of the calculated torque, or you could attach a much more powerful motor and drop that percentage.
You would be right, but you're misunderstanding what the skipping noise was in the video, probably because I did not convey that information very well...
it wasn't the gearboxes skipping at all, the skipping noise that you heard was the stepper motor losing a step.
That's surprising then that increasing the contact surface in the gearbox would increase the efficiency. It would be interesting to see if you get the same numbers using motors with differing torque outputs.
There is no way these gears are that "inefficient". Something is wrong with this.
Cool! Thanks! :)
excuse me, gear down for what. i have a question. Can you make a video on how to assemble the 60:1 gear reducer that you have on thingiverse? i printed it but i dont know how to assemble it. can you please make a video? ps i love your videos!
I expected the last one to be the best just because it looked to be more prone to holding together better with a tighter fit.
I glimpsed your face
I never wanted to glimpse your face
The magic is ruined
HOPING for a replacement for bicycle gear/sprocket ratio change !!!!
The videos where you lift something heavy using your gearbox are great. I don't understand why the lifted objects don't descend when the drill is removed. If you could explain or even make a video of using the gearbox in reverse...as in using the weight to spin a small fan blade very fast if that's possible.
We here in Canada are on the Metric system siince the 1970’s. Oh and by the way you all and Burma and Liberia are the last hold outs.
David Munro a lot of shops still use imperial and a lot of people i know still use both
We here in New Zealand are completely metricized. Outside of some people using heights in imperial, altitude and airport elevation being in feet, pretty much everyone uses metric (even a lot of the "Old Guard" craftsmen I have met use metric for everything). Australia is similar (contrasting Canada and UK's troubled and opposed transitions to Metrication).
Funnily enough, the use of metric in NZ and Oz is different to Europe as we generally never use the prefix Centi- that much (Centimeter gets used a little but we use the smaller milli- instead leading every unit being the same distance apart)
Yeah...but we've walked on the Moon...
Phil Pesek ... which is completely tangential to the efficiency of a single, scalable measurement system in trade, science, ect.
(Sorry, I felt like doing that, don't stick pitchforks in me...)
Just be glad that no one came up with an imperial unit alternative for Volt, Ampère, etc. At least we've all agreed on those. At least it makes Ohm's law very simple, which other units would bollocks up.
Hey GDFW, the near 50% efficiency would be great at low speeds, but with such high ratios on the gears are you worried about the efficiency loss from the motors having to operate toward the far end of their torque curve? Now would be a better time than any to make a dyno to test the torque of these planetary gears at operational speeds.
I plan to do a video about this, but the next robot is planned to use brushless motors, and from what I understand their output torque is almost unaffected at higher speeds, so I don't think it should be a problem, but I would LOVE to be able to preform the same tests at operational speeds, but i'm not sure yet how to do that accurately.
Brushless motors have a linear torque curve, the higher the RPM, the lower the torque.
www.groschopp.com/resources/compare-motor-types/
Once you have the brushless motors implemented you can test the gearboxes with a simple weight attached to a reel instead.
You can calculate the horsepower (in HP or Watts) by the weight and the rate it's being lifted. You can derive the torque from the horsepower and rotational speed of the output. If you are able to measure the motor's power consumption in each test, you can graph the efficiency at various speeds and gear ratios compared to the efficiency of the motor on direct drive.
For ease of testing it may be better to print smaller reel like only a few inches in diameter, and have a variable weight like sand for more granular results.
sometimes we invent something that was already invented. But we can make it better so keep at it and look in old fashion library for data on paper
And what about adding oil or grease? i'd say use graphite grease, for what i've tried, pla kind of likes sticking to other pla pieces when under pressure or smooth surfaces. in my tests graphite grease leaves the surface shiny as in the graphite embeded itself into the pla outer layer. I havent tried pure graphite but it might work too.
I tried that on the first set, it did change the outcome a little, by covering my table, tools and equipment with slimy goo that is.
hehe, torque values were unaffected, I assume that if I was testing with a dyno it would make more of a difference.
Gear Down For What?
Oils and greases are quite a science. For what i read, think grease for slow stuff, oil for fast moving machines. Maybe try something thicker? If not i dont know why the torque doesnt go up....how about adding bearings in the middle to stiffen the sun gears?
Use a harmonic drive for your robot? :)
Make a coaxial sun shaft and test it.
Bro I need one help I need to reduce speed from 3000rpm to 1000 rpm how can I design the gear ratio
for a classic gear you take a gear with 3 times more teeth (3000/1000) on the output than on the input.
if you use a smooth belt, take the diameter instead of the number of teeth.
keep in mind that using a gear will reverse the direction, while a belt won't unless you cross it.
you might look at a 1960 Chevy TURBOGLIDE transmission
3:10 That is the first thing you should have said.
Did the lubrication help in any way?
No it didn’t
Yay, Harry Potter units.
it dose not jerk into ratio changes
You used a ps4 controller
I dont understand how this tests efficiency. Planetary gears can be over 95% efficient when it comes to power transmission. If you are trying to measure that, do this:
Get a small little motor and use your scale/arm setup to plot a hp curve measuring torque vs rpm for the bare motor. You will need to modify the arm to adjust the clamping friction(load) on the axle. Diy prony brake. Then hook up your gearboxes and do another hp curve and compare output hp to known input hp based on rpm curve you did for the bare motor. Calculate efficiency from power lost.
Aw heck now that i think about it youre probably not going to do it. Ill do it and let you know how it goes. First i have to watch your other videos again to make the gearboxes...
why did you say xbox controller! Why
my last wife was a mistake.. people like talking about that one..
ahahahah just teasinnnn
call me when you get to 300 lbs
Scales are cheap. I dont trust yours. Also. Why do each gear combos slip at max? Is that the engine locking? I would hope it isnt the inserted gears cause that would mess up the whole thing.
That reminds me... How do we know the speed of light?
By europeans you mean the whole fucking planet but the US? Imperial just gets on my nerves
yeat
It whould be in correct ot use G as they are a messurment of mass not force
Holy snap im first
Holy snap you are!
Gear Down For What? I love your gearboxes btw.youre a genius
Hey thanks!
Gear Down For What? I wish i had a 3D printer
Third
Lol