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 mounting dimensions on Turnigy TR 50-65B?

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Dan Curhan
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PostSubject: mounting dimensions on Turnigy TR 50-65B?   Sat May 02, 2009 12:18 am

I'm in the process of designing a new 15... and i was looking into brushless motors. I think I like the Turnigy TR 50-65B given its specifications. Have any of you used this motor? They say it's comparable to a 4030 AXi but I don't know how they compare. Hell, I don't even know how either perform - I've just never used any of this stuff before.

If this motor looks reasonable (may be overkill... idk) for direct driving a drum, does anyone know the mounting dimensions for it (and/or any other dimensions) so I can draw it into my CAD model?

thanks
Dan
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Will Bales
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PostSubject: Re: mounting dimensions on Turnigy TR 50-65B?   Sat May 02, 2009 12:27 am

DON'T DIRECT DRIVE ANYTHING!!!!!!!!! It just messes up motors and shafts and makes them unusable. Believe me, or as Dughi what Jake's robot did to a perfectly good Turnigy Motor last year! It might have been the exact same one that you're considering. He mounted a bar to the shaft, and that was that. He bent it in his first match. Ruined the motor.
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Dan Curhan
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PostSubject: Re: mounting dimensions on Turnigy TR 50-65B?   Sat May 02, 2009 12:45 am

well... i'm thinking of something clever that would mean zero radial load on the motor (shaft included) but still direct drive... :]
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Will Bales
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PostSubject: Re: mounting dimensions on Turnigy TR 50-65B?   Sat May 02, 2009 12:47 am

does it imply mounting the drum to the can of the motor?
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PostSubject: Re: mounting dimensions on Turnigy TR 50-65B?   Sat May 02, 2009 12:48 am

maybe...
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Will Bales
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PostSubject: Re: mounting dimensions on Turnigy TR 50-65B?   Sat May 02, 2009 12:50 am

I've seen it done before, except it was in ant weights and beetle weights. I don't think that you can rely on the bearings inside of the motor to be durable enough to withstand the pounding from hits to the drum, whether they are offensive or defensive.. at that point, you might just break the motor..
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Dan Curhan
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PostSubject: Re: mounting dimensions on Turnigy TR 50-65B?   Sat May 02, 2009 12:54 am

but i has a plan! bounce

anyways, that doesn't help my dimensional crisis here... do you have any modeled in your fancyfiles anywhere?
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Will Bales
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PostSubject: Re: mounting dimensions on Turnigy TR 50-65B?   Sat May 02, 2009 12:57 am

nope! however, if you want a 400 can brushless motor, or a $400 German piece-of-art brushless motor, then I can help you! Turnigy's are cheap, but they don't give you any idea what the size really is, or hole patterns, or anything. you have to get them with the hope that they'll fit!
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Dan Curhan
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PostSubject: Re: mounting dimensions on Turnigy TR 50-65B?   Sat May 02, 2009 1:02 am

what's the difference between the aerodrivexp series and the aerodrivexp SK series? just wondering...

and since this one's comparable to a 4030 AXi, does that mean dimensionally as well?
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Will Bales
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PostSubject: Re: mounting dimensions on Turnigy TR 50-65B?   Sat May 02, 2009 1:04 am

I have no Idea what the difference really is, but you might have a point on the dimensions. there is a high likelihood that they have the EXACT SAME DIMENSIONS. Now, maybe the shape itself is different, but the hole pattern is probably standard.
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Dan Curhan
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PostSubject: Re: mounting dimensions on Turnigy TR 50-65B?   Sat May 02, 2009 1:16 am

if only SOMEWHERE would enlighten me as to what that IS.... Sad
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Cody
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PostSubject: Re: mounting dimensions on Turnigy TR 50-65B?   Sat May 02, 2009 1:49 am

I have to agree direct driving with an outrunner is a very BAD idea.
With the speeds and forces these motors exceed there is actually alot of precision to them.
Ive seen it work in ants and beetle but in a 15lb bot your just asking for bent armature, cans working loose, set screws working loose or even the entire motor working loose.
With what you have to look at with an AXI 4130 and an AXI 2826 for example is the mass that you are spinning and the voltage.
The smaller motor has less turns which gives it a higher rpm/less torque rating and the bigger motor more turns will give you more torque/ less rpms.
With that motor (4130 comparable) at maybe 14.4 volts your only looking at around 5600 rpm, but your spin up time will be crazy
After all of the im not to sure about what to tell you about dimension lol i would honestly just design for the axi specs
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Will Bales
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PostSubject: Re: mounting dimensions on Turnigy TR 50-65B?   Sat May 02, 2009 8:31 am

I hate to say it, but you're best bet might just be to bight the bullet, and buy the Axi. It will be higher quality, probably a little more durable, and possibly higher performance... it would probably not die on you either.
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PostSubject: Re: mounting dimensions on Turnigy TR 50-65B?   Sat May 02, 2009 11:12 am

well... i found the website for axi\'s manufacturer which ACTUALLY GIVES DIMENSIONS! Very Happy

I want a motor with a lot of torque and a Kv between 350 and 400. I found the AXi 4130/16 and the axi 5320/18. I\'m inclined to go for the 5320 cause it\'s got an 8mm output shaft (and bigger is better) and 8 M4 mounting holes instead of 4, but I guess I just don\'t know enough to actually decide between them. I like overkill...

but shittt that motor\'s $250!! D:
it\'s new though, so do you think if i wait a while it\'ll come down in price?
AND i found this website that sells axis that are normally $269 (axi 5530/18 on hobby-lobby) for $209.90 so I bet if I wait for the 5320/18 to show up there it\'ll be cheaper (like $189 ish?!) which would be amazing. AND shipping is only $6.45


Last edited by Dan Curhan on Sat May 02, 2009 12:43 pm; edited 1 time in total
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Cody
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PostSubject: Re: mounting dimensions on Turnigy TR 50-65B?   Sat May 02, 2009 11:29 am

i think if you use the 5320 you would also be an innovator lol if you can spare the weight, and using a CMU budget Razz id say go for it but your best bet would to do like will(and maybe us) and run dual voltages and go like 22 volts to the weapon motor, id recomend the 40c batteries to haha
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