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Old 02-05-2013, 02:09 AM   #31
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It looks like that motor is rated at 30 in lbs of torque. Is that enough?


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Old 02-05-2013, 04:06 AM   #32
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I sure hope so.. I think I read somewhere that a minimum of 17 works. If not, fall back and punt. I saw a bunch of small motors that were very low foot pounds.. but were hv DC... like 90 to 115vDC


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Old 02-05-2013, 11:52 AM   #33
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.. I think I read somewhere that a minimum of 17 works.
I had a 20 in-lb that would only work if I taped off part of the shoot to prevent the full amount of grain from passing through. What I read is that 40 in-lbs or more is what you'd like, but that 30 is the absolute minimum.
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Old 02-05-2013, 03:36 PM   #34
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Originally Posted by lunchbox View Post
It looks like that motor is rated at 30 in lbs of torque. Is that enough?
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Originally Posted by ThreeGnomes View Post
I sure hope so.. I think I read somewhere that a minimum of 17 works. If not, fall back and punt. I saw a bunch of small motors that were very low foot pounds.. but were hv DC... like 90 to 115vDC
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I had a 20 in-lb that would only work if I taped off part of the shoot to prevent the full amount of grain from passing through. What I read is that 40 in-lbs or more is what you'd like, but that 30 is the absolute minimum.
Someone correct me if i'm wrong, but I believe the torque spec is for the motor (minus the gear housing) So there are two factors in play, the torque of the motor and the reduction ratio of the gear box. In my case, the motor is 30 in/lb, with a 16.5:1 reduction ratio (1750rpm/106rpm). So my power at the shaft is 495 in/lb (30 in/lb x 16.5). The same motor with a 10:1 reduction ratio (1750rpm/175rpm) would only have an output power of 300 in/lb.

All of that said, this gearmotor (106 RPM 30 in/lb) works great hooked up to my Barley Crusher. It has no problem starting, even with a hopper filled with 18 pounds of grain.....perhaps I'll take a video of it in action next time I brew.
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Old 02-05-2013, 04:09 PM   #35
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Originally Posted by brew-n-que View Post
Someone correct me if i'm wrong, but I believe the torque spec is for the motor (minus the gear housing) So there are two factors in play, the torque of the motor and the reduction ratio of the gear box. In my case, the motor is 30 in/lb, with a 16.5:1 reduction ratio (1750rpm/106rpm). So my power at the shaft is 495 in/lb (30 in/lb x 16.5). The same motor with a 10:1 reduction ratio (1750rpm/175rpm) would only have an output power of 300 in/lb.

All of that said, this gearmotor (106 RPM 30 in/lb) works great hooked up to my Barley Crusher. It has no problem starting, even with a hopper filled with 18 pounds of grain.....perhaps I'll take a video of it in action next time I brew.
Your speculated torque figures are false. Gear motor stats are posted "as is". If you were to add an additional gear reduction transmission, then you could start multiplying numbers.


I'll be curious to see how it works out for the OP's MM3. The MM3 requires an immense amount of torque to run it smoothly. Looks like a sweet kit for a BC though. I like that the motor package you bought comes with a reverse switch.
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Old 02-05-2013, 05:55 PM   #36
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Your speculated torque figures are false. Gear motor stats are posted "as is". If you were to add an additional gear reduction transmission, then you could start multiplying numbers.
Interesting....Prior to purchasing the gear motor, I ran my mill with a cordless drill. It's peak torque rating is 455 in/lbs...and although it did the job it was clearly a workout for the drill. There is an obvious mismatch in the specs here (30 in/lbs for the gear motor vs 455 in/lbs for the drill) Hopefully someone can help explain the reason for the difference.

Link to the drill specs:
http://www.ridgid.com/Tools/R86006-C...l/EN/index.htm
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Old 02-05-2013, 11:30 PM   #37
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Drills like that are basically a 18 volt electric motor with a variable speed (trigger switch) and an adjustable transmission, the max torque is at the highest setting and full speed which drops off dramatically as the battery loses it's charge.
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Old 02-06-2013, 03:10 PM   #38
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Drills like that are basically a 18 volt electric motor with a variable speed (trigger switch) and an adjustable transmission, the max torque is at the highest setting and full speed which drops off dramatically as the battery loses it's charge.
Thanks for further illustrating my point. The drill has a peak torque of 455 in/lb under the best condition, and it can barely run the mill. So can anyone explain how a gearmotor rated at 30 in/lb can run the same mill without breaking a sweat?


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2. The phenomenon a person has when craving more bitterness in beer.
3. The long-term exposure to extremely hoppy beers; if excessive or prolonged, a habitual dependence on hops will occur.
4. When a "Double IPA" just is not enough.
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