jamesp
Cave Dweller
Member since October 2012
Posts: 36,179
|
Post by jamesp on Oct 20, 2012 19:28:20 GMT -5
This diameter and speed has been the fastest coarse grind rotary setup i have found. 80 RPM on a 6 inch barrel using 36 or 45 or 54 or 60 or 90 grit S. Carbide.Does agate,jasper,wood and even rose quartz without surface chipping.Used for 220 grit too. 4-600 grit and polish i use 25 RPM on 6 inch barrel because 80 RPM does not polish well. So i use two different tumblers.A single speed tumbler is a big compromise in speed of coarse grinding rate but manufacturers are in the business of selling a do all unit. 80 RPM is fast,violent and noisy.And never has dmaged rose quartz. Attachments:
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,179
|
Post by jamesp on Nov 3, 2012 7:07:04 GMT -5
My bragging bit me.I didn't add more material as coarse grind reduced rock load from 3/4 full to almost 1/2 load.I heard alot of rumbling on the other side of the property.The fast tumble speed chipped about 25 percent of the agate load.
|
|
|
Post by johnjsgems on Nov 3, 2012 8:33:25 GMT -5
Lesson learned. Keep the level up. On slower tumblers it is very common to have someone ask " everything looked great until polish stage and now everything is pitted, dinged up or chipped. What happened?"
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,179
|
Post by jamesp on Nov 3, 2012 13:54:36 GMT -5
Yes sir i will pay
|
|