building a trommel. Few questions
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  1. #1
    us
    Jan 2012
    Pinal Mountains,Arizona
    Garrett Groundhog-2012-1st MD. White's Goldmaster V/Sat-2nd-MD-2013 Tesoro Lobo-2015-3rd
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    building a trommel. Few questions

    My barrel is going to be a water tank heater.
    14 inches by 42 in long.
    Am planning to use a 12 volt or 24 volt motor.
    Has anyone heard or seen a wiper motor being used on one this big.
    Or should I check for other stronger motors.
    Going to use a flat belt.

    Click image for larger version. 

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    Last edited by roadrunner; Apr 24, 2016 at 04:21 PM.
    It's OK, it's over, now change your shorts.

  2. #2
    us
    Mine President, XPBC, GIH, stamp mill operator, snuffer bottle owner.

    Dec 2013
    Arcata, California
    Fisher 1212-x Fisher Gold Bug 2 Whites 4900/SP3 Rocker boxes, Keene sluices, Bazooka sluice, 2.5", 4" lowbankers, highbankers. Witch Sticks.
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    I am curious about the same thing, I'm building a trommel from an old 16" inch water heater tank.

  3. #3
    us
    Jan 2012
    Pinal Mountains,Arizona
    Garrett Groundhog-2012-1st MD. White's Goldmaster V/Sat-2nd-MD-2013 Tesoro Lobo-2015-3rd
    1,227
    519 times
    Prospecting
    Well guess i will find out on my own.Pro
    bably go with a 12 volt dc from ebay, this way i can see what the torque rating is, and the power draw.
    Then use a flat belt, with an idler arm and spring for tension.
    Just let the flat belt run on the barrel by itself.
    With the idler pulley and motor pulley being grooved, or with sides on it,should keep the belt straight.
    Got the top frame welded up today, and the legs cut.
    Thanks for stopping by.
    It's OK, it's over, now change your shorts.

  4. #4
    ca
    May 2015
    Alberta
    2 ATG, ATP, JOBE 36 Yellow Jacket Stream Sluice, Jobe EZ Sluice, Garrett pans, lots of buckets!
    38
    24 times
    Fossil, Gold and Mineral Hunting
    Lots of guys have had success using a wiper motor. They make good torque and some have gear reduction which helps speed control.
    roadrunner likes this.

  5. #5
    Charter Member
    us
    Jul 2012
    Blackfoot, Idaho
    White's GMT, DFX, Coinmaster, TDI-SL, GM24K, Falcon MD20, old Garrett Masterhunter BFO 'Way Too Cool' dual 18 Watt UV light
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    This particular gearmotor works very well on my jigs, and shaker table. RPM is about 180. Lots of torque. The unit slides onto a 12mm shaft diameter, and connects using a cotter pin. I usually use a 1/2" shaft with the end turned down to .472", or very slightly smaller. (12mm). I like to sandwich the output drive between bearings, or bushings, and let the motor float. Save wear and tear on the motor bushings.
    Gearmotor Gear Motor 1 4 HP 180 Watt 12 Volt 170 180rpm Reversible | eBay
    Jim
    roadrunner and Rockwerx like this.

  6. #6
    us
    Jan 2012
    Pinal Mountains,Arizona
    Garrett Groundhog-2012-1st MD. White's Goldmaster V/Sat-2nd-MD-2013 Tesoro Lobo-2015-3rd
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    519 times
    Prospecting
    Thanks. Jim will go take a look.
    Rock,yes I like the gear reduction

    Jim shouldn't the trommel run at about 20 -30 rpms.
    It's OK, it's over, now change your shorts.

  7. #7
    Charter Member
    us
    Jul 2012
    Blackfoot, Idaho
    White's GMT, DFX, Coinmaster, TDI-SL, GM24K, Falcon MD20, old Garrett Masterhunter BFO 'Way Too Cool' dual 18 Watt UV light
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    Probably. The unit would have to be used with some belt reduction, and a PWM speed control, which is relatively cheap on Ebay($15.00+/-).
    Jim

  8. #8
    us
    Jan 2012
    Pinal Mountains,Arizona
    Garrett Groundhog-2012-1st MD. White's Goldmaster V/Sat-2nd-MD-2013 Tesoro Lobo-2015-3rd
    1,227
    519 times
    Prospecting
    Jim, pwm same as light switch dimmer.
    Of course i can afford the $15,
    It's OK, it's over, now change your shorts.

  9. #9
    Charter Member
    us
    Jul 2012
    Blackfoot, Idaho
    White's GMT, DFX, Coinmaster, TDI-SL, GM24K, Falcon MD20, old Garrett Masterhunter BFO 'Way Too Cool' dual 18 Watt UV light
    2,634
    3227 times
    Prospecting
    PWM is "pulse width modulation". The speed is controlled by pulses of 12v. If you control the speed by lowering the voltage, you increase heat, and decrease torque...not good. By keeping the voltage at the rated max, and using pulses, of varying duration of that voltage, you don't lose much torque, and the motor doesn't overheat.
    Jim
    Rockwerx, roadrunner and Goodyguy like this.

  10. #10
    us
    Jan 2012
    Pinal Mountains,Arizona
    Garrett Groundhog-2012-1st MD. White's Goldmaster V/Sat-2nd-MD-2013 Tesoro Lobo-2015-3rd
    1,227
    519 times
    Prospecting
    Ill ask here for the benefit of every one else. What would someone recommend as to the amps of the pwm.
    I was thinking about a 30amp with a fuse included in the unit.
    About 2000 to 3000 watts.
    It's OK, it's over, now change your shorts.

  11. #11
    Charter Member
    us
    Jul 2012
    Blackfoot, Idaho
    White's GMT, DFX, Coinmaster, TDI-SL, GM24K, Falcon MD20, old Garrett Masterhunter BFO 'Way Too Cool' dual 18 Watt UV light
    2,634
    3227 times
    Prospecting
    30 amp would work fine. One thing i should mention is that few of these PWM speed controls from China have any protection from reverse polarity when connecting them to the battery.....be sure you get the polarity correct! DAMHIK...LOL
    Jim
    Goodyguy likes this.

  12. #12
    us
    Jan 2012
    Pinal Mountains,Arizona
    Garrett Groundhog-2012-1st MD. White's Goldmaster V/Sat-2nd-MD-2013 Tesoro Lobo-2015-3rd
    1,227
    519 times
    Prospecting
    Yes, I was reading that in the description.
    Also, I saw 1 or 2 that said they can not be used with a brush-less motor.
    Any thoughts on that?
    Just posted my first pic of it on my opening page.
    Last edited by roadrunner; Apr 24, 2016 at 04:22 PM.
    It's OK, it's over, now change your shorts.

  13. #13
    Charter Member
    us
    Jul 2012
    Blackfoot, Idaho
    White's GMT, DFX, Coinmaster, TDI-SL, GM24K, Falcon MD20, old Garrett Masterhunter BFO 'Way Too Cool' dual 18 Watt UV light
    2,634
    3227 times
    Prospecting
    I don't know anything about the brushless motor applications. Will have to bone up on that.
    Jim

  14. #14
    fi
    Apr 2014
    Rovaniemi
    77
    106 times
    All Types Of Treasure Hunting
    Hi!
    my old trommel is using 24v viper motor. 100 ah and 66 ah battery. the 66 ah went out of power after 9 days of trommeling. here is a link to my old trommel in action. So yes u can use it. im just bored to move batteries around. my new trommel uses 370w motor and it will run whit generator =).

  15. #15
    Charter Member
    us
    Jul 2012
    Blackfoot, Idaho
    White's GMT, DFX, Coinmaster, TDI-SL, GM24K, Falcon MD20, old Garrett Masterhunter BFO 'Way Too Cool' dual 18 Watt UV light
    2,634
    3227 times
    Prospecting
    Quote Originally Posted by roadrunner View Post
    Yes, I was reading that in the description.
    Also, I saw 1 or 2 that said they can not be used with a brush-less motor.
    Any thoughts on that?
    Just posted my first pic of it on my opening page.
    The deal on the brushless DC motors is they use a solid state controller (built-in) to charge the appropriate coils as the rotor turns. Apparently, the PWM pulses aren't tolerated by the controller in the motor...it wants to see a constant voltage. In a brushed DC motor, the commutator determines which coils are charged, and when, as the rotor turns. The commutator is simply a mechanical switch, so the form of the voltage it sees is irrelevant.
    Jim
    roadrunner likes this.

 

 
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