ejs
spending too much on rocks
Member since July 2008
Posts: 478
|
Post by ejs on Aug 30, 2008 8:41:22 GMT -5
Greetings! I am on board with the idea of adding pellets to my tumbles to improve the action of the grit, to get to a better shape faster, to increase volume, and to protect/cushion the rocks in the final stages.
I have both plastic pellets and ceramic cylinders and pellets. Do you recommend one or the other of these for the various stages? I could imagine it might be better to use the ceramic in the earlier stages (where I am primarily concerned with increasing grit action) but plastic in the later stages (where you want to add some cushioning during the polish). The ceramic comes in various sizes - are certain sizes better for certain stages? The larger ones are more convenient as they are easier to pick out.
I like the idea of using the ceramic over and over, but my #1 concern (by a long shot) is the quality of the final product. My current plan is to use medium-sized ceramic cylinders in the rough and medium stages, and the plastic pellets during pre-polish, polish, and burnish. But I'd use ceramic in all stages if that improved the outcome.
Thoughts? Thanks so much!
|
|
darrad
fully equipped rock polisher
Member since September 2006
Posts: 1,636
|
Post by darrad on Aug 30, 2008 9:20:18 GMT -5
I personally do not add anything other than rocks and grit for the rough grinding. I found the "filler" slowed things down. I do use pellets (floaters) in each step after. The ceramic are a pain to dig out in my opinion.
|
|
tombodc
noticing nice landscape pebbles
Member since August 2008
Posts: 88
|
Post by tombodc on Aug 30, 2008 13:37:12 GMT -5
I use the very small ceramic beads from start to finish. I add the plastic pellets during the later stages to make up for the lost room and to cushion the tumbling in hopes of decreasing any damage to the rocks. All I can do at this point is hope that my "plan" is correct as I have yet to finish a batch of rocks, lol. I made the mistake of making my first batch Emeralds, Sapphires, and very few rubies. These rocks appear to be rather hard and so far have been in rough grit for 10 weeks and are just now starting to get close to the shape that I want them in. I keep trying to be patient as I keep seeing on these forums that the first stage is VERY imnportant when it comes to the final shine!
|
|
|
Post by deb193redux on Aug 30, 2008 13:52:11 GMT -5
Depends, vibe or rotary?
In rotary plastic pellets are only about cushioning. They do get into small voids and carry grit, but don't have the mass to do much work. A feather wrapped in sandpaper is still a feather.
So, if you do not have enough small rocks in your rortary load, add the ceramic. Add plastic in medium thru polish if the material is fragile.
If you have a vibe, add lots of ceramic in every stage, and do not even think about adding plastic - except for something like apache tears in polish, and even then it may not be needed.
|
|
ejs
spending too much on rocks
Member since July 2008
Posts: 478
|
Post by ejs on Aug 30, 2008 15:06:01 GMT -5
Ah, sorry, just rotary for me.
I have plenty of small rocks to add to the coarse grit (doesn't everybody? I mean, just grab some rocks from the road and smash them!). I always run full loads so never need to make up volume (I'll run two rounds of medium to have a full barrel for the pre-polish, etc.).
So my goals are to speed up the shaping (since I am running quartz, citrine, ocean jasper etc. for many rounds) and to produce a shinier/smoother finished rock. I think that ceramic will work best for the former and plastic for the latter, but I am not sure.
|
|
|
Post by deb193redux on Aug 30, 2008 19:16:05 GMT -5
I agree more or less. Ceramic can be more convenient than smashed road rock because it will throw less mud and you charge will last a bit longer.
If your quartz is crazing or you have OJ with some of the more sugar-crystal like druze, then the plastic can help prevent damage in pre-polish and polish.
|
|