caupwhiting
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Member since October 2010
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Post by caupwhiting on Feb 18, 2020 19:16:20 GMT -5
I'm new to the forum, but not to tumbling. But, I've always used a Lortone (I think it's a 4lb) right out of the box. I've had another Lortone which runs a 12 lb barrel, but the motor has never worked. I decided to start tumbling some glass for my older sister to use in crafts, so I put a new motor on the 12 lb. The motor runs at 1725, there is a 7" pully on the roller side and I put a 2" on the motor. It's running too fast. What pulley setup would slow it down to a nice slow tumbling speed?
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Post by knave on Feb 18, 2020 19:26:30 GMT -5
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caupwhiting
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Member since October 2010
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Post by caupwhiting on Feb 18, 2020 22:00:21 GMT -5
Thank you. Since it is to fast, what would be a good speed for the tumbler? I'll play with the pulleys to see what will get me there. Thanks again.
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quartz
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Post by quartz on Feb 18, 2020 22:56:55 GMT -5
About 30 RPM would be good for your barrel. How fast is it running now? It isn't just pulleys that determine your barrel speed, the ratio between the roller shaft and barrel act as a second reduction. It would help from this end to know what those two diameters are before figuring what pulley sizes you need.
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caupwhiting
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Member since October 2010
Posts: 10
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Post by caupwhiting on Feb 18, 2020 23:17:36 GMT -5
I'm not sure of the numbers, but it is turning faster than it should. "the ratio between the roller shaft and barrel act as a second reduction" I'm not following what you are telling me to do.
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Post by knave on Feb 18, 2020 23:23:27 GMT -5
The roller shaft that drives the barrel. How many rpm does the roller shaft need to drive the barrel 30 rpm.
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caupwhiting
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Member since October 2010
Posts: 10
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Post by caupwhiting on Feb 19, 2020 0:07:42 GMT -5
The motor is 1725RPM 11 3/4" between Motor Shaft and tumbler Drive Shaft Roller Shafts are 7/16" 4 3/4" between Roller Shafts (on center) Motor Pulley is 2" (I have a 1" pulley if needed) Drive Shaft Pulley is 7"
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Post by rmf on Feb 19, 2020 3:53:07 GMT -5
The 1 inch pulley should give you 35 RPMs with the 7" pulley
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jamesp
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Post by jamesp on Feb 19, 2020 7:39:49 GMT -5
The motor is 1725RPM 11 3/4" between Motor Shaft and tumbler Drive Shaft Roller Shafts are 7/16" 4 3/4" between Roller Shafts (on center) Motor Pulley is 2" (I have a 1" pulley if needed) Drive Shaft Pulley is 7" I have a simple formula for calculating barrel speed caupwhiting. You must know BARREL DIAMETER. (shaft diameter divided by barrel diameter) times(small pulley divided by big pulleY) times motor RPM. 7/16 = .44 so .44/barrel diameter X 2/7 x 1725 = barrel rpm. say barrel diameter is 7 inches then .44/7 x 2/7 x 1725 = 30.8 rpm for 1 inch motor pulley the speed would be cut 1inch/2inch = 1/2 x 30.8 rpm = 15.4 rpm. Again, you must know barrel diameter, it is part of the ratios of speed reduction from 1725.
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caupwhiting
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Member since October 2010
Posts: 10
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Post by caupwhiting on Feb 19, 2020 12:12:23 GMT -5
The motor is 1725RPM 11 3/4" between Motor Shaft and tumbler Drive Shaft Roller Shafts are 7/16" 4 3/4" between Roller Shafts (on center) Motor Pulley is 2" (I have a 1" pulley if needed) Drive Shaft Pulley is 7" I have a simple formula for calculating barrel speed caupwhiting. You must know BARREL DIAMETER. (shaft diameter divided by barrel diameter) times(small pulley divided by big pulleY) times motor RPM. 7/16 = .44 so .44/barrel diameter X 2/7 x 1725 = barrel rpm. say barrel diameter is 7 inches then .44/7 x 2/7 x 1725 = 30.8 rpm for 1 inch motor pulley the speed would be cut 1inch/2inch = 1/2 x 30.8 rpm = 15.4 rpm. Again, you must know barrel diameter, it is part of the ratios of speed reduction from 1725. Barrel diameter is 7 5/8. I understand your formula,but the barrel just seems to be rotating faster than it should, even with the 1 inch pulley on the motor. Thanks for the information. I think I'll put in a batch of glass and see how it goes. I appreciate all of the tips provided by forum members. Read more: forum.rocktumblinghobby.com/thread/90579/pulley-size-help?page=1#ixzz6EQAAbaif
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caupwhiting
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Member since October 2010
Posts: 10
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Post by caupwhiting on Feb 24, 2020 14:17:59 GMT -5
went with the 7" pulley on the shaft and 1" on the motor. Started to tumble a load of glass in a 12 lb Loretone rubber barrel. Checked on it about 20 minutes later and turned it off because the motor was very hot. I pulled the motor apart, oiled the bearings (they were pretty dry) put it back together and started it up again. Again, the motor is getting very hot. I don't know that much about motors, but from what I see on the information on the motor, the operating temp is 50 degrees centigrade (122 degrees Fahrenheit). It also shows it is a single phase, continuous. Is it safe to run this motor on a tumbler, or should I look for a new motor? If so, what should I be looking for in another motor?
Thanks for everyone's help.
Was going to insert a photo of the plate on the motor, but can't.
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Post by knave on Feb 24, 2020 14:29:13 GMT -5
Are you measuring °F and rounds per minute? Or is it just too fast and too hot?
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caupwhiting
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Member since October 2010
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Post by caupwhiting on Feb 24, 2020 14:52:30 GMT -5
The plate on the motor says 50 degrees centigrade. I just used a conversion to Fahrenheit. I put my hand to the motor and can only hold it there for a few seconds. The tumbler is turning faster than I'm used to, but according to the calculations it's within specs. it's not turning so fast that it's way out of wack, just in my experience, it's turning fast. I'm more concerned with the motor at this point. I don't have anything to measure the motor temp myself.
This is the information on the motor.
5XBG001B HP ¼ V115 RPM 1725 CODE S CY60 PH 1 A6.0 SFA TEMP RISE 50C TIME RATE CONT THRM FROT (NOT SURE OF THIS) X AAA
Maybe this will help.
Thanks for your help.
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quartz
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breakin' rocks in the hot sun
Member since February 2010
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Post by quartz on Feb 25, 2020 0:04:12 GMT -5
You need to come up with a temp. of the motor to really know if it's haywire or not, specs. on the motor tell a story, the motor itself tells it's condition. Temperature guns are plentiful and pretty cheap. There are people on the forum who have put small fans on motors that get hot in operation, especially motors that aren't out in the open and don't breathe well.
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Post by knave on Feb 25, 2020 0:15:23 GMT -5
6 Service Factor Amps 50°C Temp Rise Looks like this motor is designed to run warm. “Too hot to touch” is somewhere around 130°F.
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Post by knave on Feb 25, 2020 0:18:05 GMT -5
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Post by knave on Feb 25, 2020 0:20:47 GMT -5
Be aware that the IR guns can be very inaccurate, as the reading varies with the emissivity of the material being measured. A piece of black tape on the hot surface can help. Also check out the thermal imaging cameras that plug into your phone. Very handy.
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Post by knave on Feb 25, 2020 0:24:28 GMT -5
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caupwhiting
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Member since October 2010
Posts: 10
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Post by caupwhiting on Feb 25, 2020 15:28:13 GMT -5
I borrowed a friends lazer gun for measuring temps. The meter showed the temp of the motor to be 129 degrees.
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caupwhiting
off to a rocking start
Member since October 2010
Posts: 10
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Post by caupwhiting on Feb 25, 2020 17:13:56 GMT -5
I let the motor run for about an hour and tested it again, it was at 150 degrees. Not going to use this motor.
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