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#1
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Re: pic: In_CIM_erator
Speaking of Mabuchi, my guess is that the BaneBots RS-775 motors are not made by them...see http://www.chiefdelphi.com/media/photos/36278 and look closely at the motor, and then at the drawing posted on Mabuchi's website. Observe the shape of the rear vent holes is different. While that's not conclusive proof of anything, it's a reason to doubt that the BB RS-775 is that particular Mabuchi model. (I've seen another pattern, with no vent holes, on some Mabuchi motors; that isn't it.)
As far as I know, none of BaneBots' KOP motors are made by Johnson or Mabuchi. The best refutation of this would be to find their logo: Johnson often stamps a "JE" mark on the front face of the motor (where the mounting screws are), and Mabuchi usually prints a stylized "M" on the label (they haven't used painted numbers on FRC motors in the past). |
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#2
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Re: pic: In_CIM_erator
if the rs550 had more torque at a higher speed doesn't that mean it has more power?
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#3
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Re: pic: In_CIM_erator
Yes but none of the specs support this and your thumb test did not appear to measure speed.
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#4
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Re: pic: In_CIM_erator
thumb test = slowly apply load until motor stalls, rs550 gave me a burn because it didn't stall. rs775, stalled very easily. this is in contradiction to the spec sheets, and based on discrepancy between spec sheets i think teams should actually run the motors to see how much power they actual give off, we don't have a dyno, but someone who does can measure power.
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#5
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Re: pic: In_CIM_erator
Quote:
I see no reason to not trust the banebots specs. |
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#6
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Re: pic: In_CIM_erator
Quote:
ok, but i recommend you turn one on at the least, compare it to the RS-550. |
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#7
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Re: pic: In_CIM_erator
Hawiian Cadder- It is amusing that you are continuously questioning the intelligence of Adam as well as team 33, among others. while they try to explain to you your errors.
I am pretty sure Adam has turned on one of the motors 5 weeks into build... |
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#8
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Re: pic: In_CIM_erator
Also, on the "thumb test" the 775 shaft is significantly larger than the 550 shaft. You're able to get a much better grip on it, and apply more torque to it.
Not at all scientific nor conclusive. |
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#9
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Re: pic: In_CIM_erator
i made a hub out of delrin which press fit onto the rs 775 axle, on the other side it pressed onto the rs550 axle, they were both the same delrin drum which was tested.
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#10
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Re: pic: In_CIM_erator
Quote:
Lock the shafts of the two motors together, and run them opposite directions. Whichever doesn't die is the winner! |
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#11
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Re: pic: In_CIM_erator
i was planning on making my delrin hub into a pulley tomorrow and see which motor will lift a little weight the fastest, we are not using either of the kit motors either so i may try a drag race, that will likely fry one or both of the motors though.
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#12
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Re: pic: In_CIM_erator
You should do a series of weights until you reach stall that way you can find peak power. You should also use a power supply to control the voltage if possible.
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#13
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Re: pic: In_CIM_erator
95 used the banebots published spec sheet to design a shoulder joint. It is operating as intended, which I would not expect to be the case if the actual motor performance and the specified performance differed by such a wide margin. Given the frictional loses we're undoubtly encountering it's a little surprising that it's performing as well as it is, truth be told. We were conservative and planned on using two of these motors ganged together, but are finding out it operates just fine on one. We'll likely use the second anyways but I wouldn't be surprised to find out the motor is operating a bit above the projected rating.
In fact, not only is it operating spot on at the design speed, it is holding level a pretty substantial arm for ~10 seconds (stalled at about 15 amps maybe) with no apparent heat issues. I'm petrified of holding any longer then that right now, but I suspect it could do it. That places it well above the FP motor in my book on the size/weight/power/reliability value matrix. Whatever the actual performance is it's way closer to the banebots published spec then it is to 70 watts. |
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