Lapidaryforum.net

Please login or register.

Login with username, password and session length
Advanced search  

News:

Welcome new members & old from the Lapidary/Gemstone Community Forum. Please join up. You will be approved after spam check & you must manually activate your acct with the link in your email

Congratulations to Sandsave and his Crinoid Cab!

 www.lapidaryforum.net

Another cabochon contest coming soon!

Pages: [1]   Go Down

Author Topic: Finishing Cabs  (Read 216 times)

0 Members and 1 Guest are viewing this topic.

montanajohn

  • Newbie
  • *
  • Offline Offline
  • Posts: 37
Finishing Cabs
« on: March 08, 2019, 01:14:11 PM »

  One shortcut I've grown fond of is the finish tumbler.  Throw 300 or so shaped cabs and some other related items in the vibratory for 10 days and they come out perfectly polished, no scratches to refinish and no hours of mindlessly boring hand polish work.  Shaping is such fun, and there is more time for that now.
Logged


peruano

  • Retired Zoologist
  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 284
Re: Finishing Cabs
« Reply #1 on: March 09, 2019, 05:00:58 AM »

Yes and the backs are polished. Some folks will complain that the edges are a bit softened, but then some folks tend to put an edge that is  too sharp to safely mount anyway.  A ten day shake sounds like a patient operator.  Can you detail your procedure for that 10 day period.?
Logged
Combining a love of bikes (pedal and otherwise) with hiking, hounding, lapidary, and the great outdoors

montanajohn

  • Newbie
  • *
  • Offline Offline
  • Posts: 37
Re: Finishing Cabs
« Reply #2 on: March 09, 2019, 09:19:32 AM »

  I've been using Tom and Jim Harmon's formula from their book on How to's of cabbing and carving.  They use 3 days of 220 grit washing daily, 3 days of 5/600, then 4 days of polish.  For polish they recommend lusterite #2 and a bit of tin oxide.  Primarily Montana agates but I usually have others in the batch and they mostly do well.
  There's only 3 pages of tumbling information in the book but its the best I've used, uncomplicated and concise.  There is a good bit of recommendations on amounts of water and soap etc which is lengthy for a reply but I'd be glad to forward what I have if you do not have access to a copy.
Logged

bilquest

  • Jr. Member
  • **
  • Offline Offline
  • Posts: 54
    • Rocks and Stuff
Re: Finishing Cabs
« Reply #3 on: March 09, 2019, 01:05:53 PM »

I agree wholeheartedly! Shaping is much more fun than sanding. However, 10 days? Either my vibe runs extra speedy, or I'm not doing it right. I get a mirror polish in as little as 3 days. Here's my recipe:

- shape stone and sand to 400 grit SC on the wheel
To the vibe:
- 24 hours with 600 grit
- 24 hours with Tripoli (pre-polish)
- 24 hours with TXP (or Aluminum Oxide)
If still hazy
- 24 hours with Raybrite

I have the Tumble Vibe (model: TV-5.) The only downside is the wait. Not waiting for the vibe to finish, but waiting until I have enough cabs to run a batch.
Logged

irockhound

  • Hero Member
  • *****
  • Online Online
  • Posts: 805
    • RockhoundingUSA
Re: Finishing Cabs
« Reply #4 on: March 09, 2019, 03:53:15 PM »

Yeah it takes a lot out of the process when you run large batches.  I used to cab 40 or so stones at a time and to keep my trays clean would take the whole batch thru each wheel before moving on.  That wears on you because you have a huge time sink with no gratification till you get them across all the wheels.
Logged

montanajohn

  • Newbie
  • *
  • Offline Offline
  • Posts: 37
Re: Finishing Cabs
« Reply #5 on: March 09, 2019, 04:05:44 PM »

Bilquest your recipes sound interesting.  I assume everyone develops their own best, and there is a lot of polishes out there.  I just take stones through the 220 hard wheel and quit.  3 days in the 220 grit at that point may be overkill but I do hate getting to the end of it and having to start over.
  On another note, I wonder if any of you have run across a way to tumble polish nephrite jade to a shine?  I've tried a lot of methods and none worked.
Logged
Pages: [1]   Go Up
 

Page created in 0.079 seconds with 34 queries.