slabcabber
has rocks in the head
Member since April 2010
Posts: 590
|
Post by slabcabber on Aug 28, 2010 8:56:55 GMT -5
I am building a LARGE ( about 70lbs ) tumbler and I too need advise on the size of the motor.. I am going to run two 35lb barrels on it at the same time... So what I need to know is this. How much horse power do I need? Do I need start and run capacitor for this motor?
|
|
|
Post by Hard Rock Cafe on Aug 28, 2010 12:12:57 GMT -5
Hi Mark,
I run a 50 lb. tumbler with a 1/12 HP motor, but I wouldn't recommend it because the motor isn't as efficient when it's overloaded. Dr. Joe will no doubt be able to provide you with the specifics on amperage and motor efficiency; I recall seeing one of his posts on the topic, but can't remember the details.
Anyway, I would suggest 1/2 HP as a starting point. Covington uses 1/3 HP for their 40 lb. commercial tumbler.
No need for capacitor start or run. Capacitor start would kick it off with a bang, but you really don't care if it takes a few seconds to get up to speed. Capacitor run would help if you thought you would have sudden changes in load and you didn't want it to bog down; not likely with a tumbler. Once they get rolling, they're pretty easy to drive.
Hope that helps, Chuck
|
|
|
Post by johnjsgems on Aug 28, 2010 14:23:19 GMT -5
HP 40 lb. used 1/3 also. DP uses 1/3 hp on all their (formerly HP) barrel tumblers through 65 lb.
|
|
|
Post by Hard Rock Cafe on Aug 28, 2010 15:01:42 GMT -5
Oh, and it's a good idea to run 2 35 lb. barrels instead of one 70 lb. barrel. My 50 lb. barrel is a back breaker.
Chuck
|
|
|
Post by rocklicker on Sept 15, 2010 16:52:31 GMT -5
I run a 67lb tumbler (4 15 pound barrels and a little half sized one) with a 1/3hp motor and it's fine. I have a desk fan blowing on it for the hot summer months. Steve
|
|
docharber
has rocks in the head
Member since October 2008
Posts: 716
|
Post by docharber on Sept 30, 2010 14:39:13 GMT -5
What we're really talking about is torque, not horsepower. Capacitor start is usually used for induction motors and is needed because of ythe way they are designed- they need a kick to start regardless of the load. The capacitor allows them to draw a large current initially without blowing a circuit breaked. I have a homemade tunbler with a 14" diameter barrel and operate it with a continuous duty motor from a Xerox copier rated at 1/13 HP and it starts and runs without even getting warm. It is a dual speed motor with two field coil wire connections and I run it at 1750 RPM through Lortone drive parts. I get about thirty RPM with a 3/4 drive rooller. The bigger motors probably use more electricity, too.
Mark H.
|
|