collapse


* User Info

 
 
Welcome, Guest. Please login or register.
Did you miss your activation email?

* Who's Online

mike(swWash)chekaracanada

Dot Guests: 176 | Dot Users
Dot Hidden: 0

* Board Stats

  • stats Total Members: 13005
  • stats Total Posts: 130829
  • stats Total Topics: 18306
  • stats Total Categories: 5
  • stats Total Boards: 48
  • stats Most Online: 814

* Advertisers

Gear Pan
The lil Gold Spinner
BC GOLD
The lil Gold Spinner
The Pocket Sluice

Author Topic: electric motors vs gas in trommels  (Read 8675 times)

0 Members and 1 Guest are viewing this topic.

Offline yupthatsme001

  • Sr. Member
  • *****
  • Posts: 286
  • Kudos: 2
electric motors vs gas in trommels
« on: June 14, 2013, 11:52:55 AM »
Just wondering if anyone has used or swapped out a gas motor for a 120v electric driver.  Basicly I'm wonder what would be the normal hp of an electric motor that would work.  My 6 hp idles with no load, @ aprox 1750 rpm. (A normal speed for some off the shelf electric motors).  Why am I pursuing this?  Quietness!   The genny that would run this could be some distance away...

Any thoughts?

Offline jack

  • PPT Invited
  • *****
  • Posts: 785
  • Kudos: 5
Re: electric motors vs gas in trommels
« Reply #1 on: June 14, 2013, 12:45:42 PM »
  Torque at low speed is probably what you're after. That's why such a large (6hp) engine is required. A properly controlled DC motor will give full torque throughout the speed range. My guess is probably not more that 1 or 1.5 HP, 90VDC from 120VAC.  A fully loaded 15 Amp.  120 volt  (1500 watt) outlet will give you about 2 HP.

Offline ryanonthevedder

  • PPT Invited
  • *****
  • Posts: 1248
  • Province/State: Chilliwack
  • Kudos: 18
Re: electric motors vs gas in trommels
« Reply #2 on: June 15, 2013, 10:45:46 PM »
I am a fan of electric motors when they are appropriate. 120v stuff is cheap and easy to figure out. Depending on how big your trommel is you probably dont really need the 6 hp. Find a cheap 1/2 hp motor and try it out. If it doesn't work try again; I like where you are headed too.

Offline yupthatsme001

  • Sr. Member
  • *****
  • Posts: 286
  • Kudos: 2
Re: electric motors vs gas in trommels
« Reply #3 on: June 15, 2013, 11:39:16 PM »
I realize, that with the speed reduction that I have, it has increased the torque output.  I have pondered if the use of a 1/2 or 3/4 hp electric motor would be able to turn my trommel, as when I tested it today, there was no way I could power out the gas motor what so ever by trying to stop the drum...(hummm- safety concern!!). 

Offline jack

  • PPT Invited
  • *****
  • Posts: 785
  • Kudos: 5
Re: electric motors vs gas in trommels
« Reply #4 on: June 16, 2013, 07:11:16 AM »

  How big of an electric motor is on a cement mixer?

Offline yupthatsme001

  • Sr. Member
  • *****
  • Posts: 286
  • Kudos: 2
Re: electric motors vs gas in trommels
« Reply #5 on: June 16, 2013, 12:03:35 PM »
 <-thinking-> <-thinking-> <-thinking->

That was a good question Jack.  After looking it up I found the cheaper ones to be between a 1/3 to a 1/2hp.  Worth some experimentation...I don't see why it wouldn't work.. <-thinking->

Offline Johnnydanger

  • PPT Invited
  • *****
  • Posts: 166
  • Province/State: Alberta
  • Country: ca
  • Kudos: 4
Re: electric motors vs gas in trommels
« Reply #6 on: June 17, 2013, 08:53:40 PM »
I was going to build one of these over the winter but I decided to do a highbanker instead. I did a lot of research on them and there was a build somewhere that used a heavy duty truck windshield wiper moter and a potentiometer to control the speed of the barrel. He was able to lower the overall height by quite a bit.

Offline ELStopaRatta

  • Full Member
  • ****
  • Posts: 84
  • Province/State: BC
  • Kudos: 1
  • Learning Hardrock mining the HARD way.
Re: electric motors vs gas in trommels
« Reply #7 on: June 17, 2013, 10:39:40 PM »
I agree with the Jolly Roger dude. You'd likely be able to use a cheapo 1800RPM 1hp 120VAC motor.
The tallest trees from acorns grow.

Offline jcazgoldchaser

  • Full Member
  • ****
  • Posts: 145
  • Kudos: 4
Re: electric motors vs gas in trommels
« Reply #8 on: June 20, 2013, 11:11:02 AM »

  How big of an electric motor is on a cement mixer?
Pretty damn good question there Jack!  I think mine is 1/3 or 1/2hp.  It has a 1" drive gear and the primary is the diameter of the drum ~24".  Consider this, I can easily put 2 bags of mix in that, 120lbs + water.  How many shovels before you hit 120lbs?  How many shovel fulls are in a trommel at any one time?

This was on another forum.  I haven't heard the audio, but checkout the drive,..

http://www.youtube.com/watch?feature=player_embedded&v=7qonY1UlGqM

Offline ScottMT

  • Jr. Member
  • ***
  • Posts: 58
  • Province/State: Helena MT
  • Kudos: 0
Re: electric motors vs gas in trommels
« Reply #9 on: June 20, 2013, 12:09:23 PM »
I did my 8" trommel off the plans  in the free plans section. I'm reducing 30:1 and am using a 1/6 hp motor and put the generator about 100' away. all you here is the water and rocks in the barrel. Works great and will stop if really hung up in it.

 


Gear Pan
Gold Rat