adrian65
Cave Dweller
Arch to golden memories and to great friends.
Member since February 2007
Posts: 10,777
|
Post by adrian65 on Oct 18, 2008 21:50:32 GMT -5
Hello, everyone! I will soon have a barrel of this model of tumbler. I will build myself the rest of the tumbler and I'd need some data. So, anyone who owns such a tumbler, would you please let me know: a. the rotation speed of the barrel; b. the distance between the two shafts on which the barrel sits; c. the dimensions (maximum diameter and height) of the barrel. Thank you very much, Adrian
|
|
|
Post by catmandewe on Oct 18, 2008 22:26:37 GMT -5
15 rpm 6 1/4 inches center to center 9" diameter 9 1/2" height(including the wing nuts)
You are welcome very much,
Tony
|
|
adrian65
Cave Dweller
Arch to golden memories and to great friends.
Member since February 2007
Posts: 10,777
|
Post by adrian65 on Oct 18, 2008 23:10:01 GMT -5
Only 15rpm??? So glad I asked, my Lortone 3A is spinning much faster. But probably the bigger the barrel, the slower the rotation. Thanks a lot, Tony! Adrian
|
|
|
Post by connrock on Oct 19, 2008 6:43:21 GMT -5
HeyI call that cheating!!!
You are supposed to figure out all this by yourself!! ;D
connrock
|
|
garrett
having dreams about rocks
Member since August 2008
Posts: 62
|
Post by garrett on Oct 22, 2008 7:36:55 GMT -5
|
|
1rockhound
spending too much on rocks
Member since July 2008
Posts: 286
|
Post by 1rockhound on Oct 22, 2008 10:04:53 GMT -5
My tumbler holds three 15 pound barrels and turns at 8 rpm. It may go a little slower but I do not experience any chipping or cracking like I hear others talk about.
Jason
|
|
adrian65
Cave Dweller
Arch to golden memories and to great friends.
Member since February 2007
Posts: 10,777
|
Post by adrian65 on Oct 22, 2008 10:14:12 GMT -5
Thanks Garret, I like that speed more than the slower one, I was wondering how big must be the secondary wheel to get such a low speed.
Besides, having such a wide beach of values of the rotation speed within the barrell works well, gives me a lot of freedom in building the machine.
Adrian
|
|
1rockhound
spending too much on rocks
Member since July 2008
Posts: 286
|
Post by 1rockhound on Oct 22, 2008 10:49:51 GMT -5
I use a 1 inch pulley for the drive and a 18 inch pulley for the tumbler on 1 inch shafts. The shafts on the tumbler may turn at 30 rpm but the barrel is doing 8 1/2 rpm. I'm pretty sure they were giving you there shafts rpm not the barrels. 30+ rpm on a barrel that size is very fast IMO it is excessive. The speed Tony gave is from his Model B I'm sure and if Thumler is only running around 15 I think 30+ is overboard.
Jason
|
|
garrett
having dreams about rocks
Member since August 2008
Posts: 62
|
Post by garrett on Oct 22, 2008 22:26:11 GMT -5
Adrain
31 ½ RPM is the speed I turn the Thumler, Model B barrels on my tumbler. I also run Lortone 12 pound and 6 pound (QT-12 & QT-66) barrels on the same tumbler at the same time. They turn at 39 RPM.
When I decided to build my own setup I talked to Shawn at “The Rock Shed” (where I bought the two Lortone tumblers with two 12 lb and four 6 lb barrels). He advised me to turn them somewhere around 35 RPM. I continued to research the internet to confirm what Shawn had told me and most of the answers I found were real close (nobody agreed on an exact number). One of my first posts on this site was to Chadman to ask him what speed he turned his drums (I was impressed with the machine he built). So going back to Shawn’s advice, that was my approximate target speed.
I’m not saying that 35 RPM is the speed everybody should use either. I’m sure that at 8.5 or 15 RPM a person would experience a lot less chipping or cracking, if any at all, like 1rockhound says. If you put a four step pulley on the motor you will have more choices as to what speed to run.
The way I understand it, this is how it works:
Drive pulley diameter, divided by the driven pulley diameter, times the motor speed , equals the driven pulley (or driven shaft) speed. Or; 2.625 in. motor pulley / 18.35 in. shaft pulley X 1725 RPM motor speed equals 246.76 shaft RPM. And; 1.1875 shaft diameter / 9.25 barrel diameter X 246.76 RPM shaft speed equals 31.68 RPM barrel speed.
I have a hand held tachometer at work and could bring it home to check the exact RPM but I checked it with the second hand on my watch and it’s close enough for me.
I am e-mailing you the spread sheet in MrcroSoft Excel format with the formulas built in. I have a four step pulley on the motor so that’s how I put the spread sheet together. Change the pulley and shaft diameters around to see what you want to go out and buy, just use all inches or all millimeters for the measurements (don’t mix them).
Good luck,
Garrett
|
|