Page 2 of 2 FirstFirst 12
Results 11 to 12 of 12
  1. #11
    Senior Member blabbermouth niftyshaving's Avatar
    Join Date
    Oct 2009
    Location
    Silicon Valley, CA, USA
    Posts
    3,157
    Thanked: 852

    Default

    Quote Originally Posted by dnjrboy View Post
    I think I am going to try the silicon carbide grit. I can get it here in town and it is a whole lot cheaper than a DMT D8C. Plus, the rock shops in town sell it by the pound.

    I assume that the grit gets washed down the sink when I am done lapping? Or is there a way to reclaim the grit?
    Rock shop grit is a good thing but nix the grit down the drain.

    If you ever clog the drain with grit it will be as if you poured cement down the drain. Better to have a plastic bucket of water and wash the grit off there. After a couple of hours decant (pour off) the water from the top and eventually let it dry. When it is mud, muck it out of the bucket on to old news paper and toss it in the trash. Once or twice down the drain is no big deal but it adds up over time.

    If you want an adventure you can try to separate the coarse from the fine by
    pouring off the 'grey' water and leaving the sandy grit on the bottom. The grit from the bottom can be used on a lap plate over and over until it is spent but do not bother, remember that you have no idea what grit size it is anymore.

    When I used to polish rocks we had an iron lap plate that we would sprinkle grit on and polish the sample with finer and finer grit. We would wash the plate and sample of the previous grit and sprinkle a little bit of the next finer until done. We had a drain under the lap that went into a cascade of buckets so the mud and grit would settle out overnight prior to letting the water hit the drain.

    As a side note.
    When polishing a telescope mirror as a kid we would suspend the polishing rouge in water. Early in the polishing stage the suspension would stand for
    only a min. As the polish got finer and finer the timer was set longer and longer before we would slurp off a charge with a turkey baster.

  2. The Following User Says Thank You to niftyshaving For This Useful Post:

    dnjrboy (11-13-2009)

  3. #12
    Cream Huffer
    Join Date
    Aug 2008
    Location
    Edmonton, Alberta
    Posts
    573
    Thanked: 74

    Default

    grit from the rock store rocks. I made more progress in 10 minutes tonight than I did in 30 minutes last night using sandpaper. I just put the grit on my granite floor tile, tossed on a little water, and went to town. Worked great.

Page 2 of 2 FirstFirst 12

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •