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This list digest contains the following message subjects:

1. LapDigest News for Issue No. 75 - Mon 10/20/97
2. RE: Vertical Flat Lap Problems
3. RE: Vertical Flat Lap Problems
4. RE: Mud Saw
5. RE: Comments on BIO: Raymond Rodebaugh
6. RE: Comments on BIO: Raymond Rodebaugh

Subject: LapDigest News for Issue No. 75 - Mon 10/20/97

Listed below are eight queries for which no one had a reply!
In the flat lapping problem, Chee-Kwong Han said that he had
run his lap unleveled, and had abraded the trough in one
spot, and asked what to do about it. It is the second item
in Issue 72 (thus, 72-2). The item 'Polishing Jade' is a
description of how one person polishes jade, and is not a
query. But if any of you have comments about the method, or
any of the other items, I would like to hear them.

Flat Vibratory Lapping Problem 72-2
Polishing Jade 71 2
Diamonds in Tumbling Operations 69 4
Flat Lapping Dugway Geodes 67 2
Horizontal Slab Saw Lubrication 65-5
Lapping Agate Slabs 58-2
Peruvian Opal Info? 55-3
Reynolds Metals Polishing Powders 57-3

The following are the files now available in the Archive.
Those items not marked with * are thread files; that is, they
are files of all items from a single thread. The name of the
file corresponds to the name of the thread given in the

The Index had been updated to Issue 74. I will try to update
it every 5 issues or so. There is one file in the Archive
named 'IndexTo74.txt'; this is the most recent index. The
file 'Index.txt' is the same file, but without the last file
number shown.

All files in Archives are:


Hope you have a GREAT week!!! And above all, ENJOY LIFE!!!


Subject: RE: Vertical Flat Lap Problems

Dave Daigle writes:
<< Could I put some grease on the joint where the waterglass
meets the slab to prevent water from reaching the waterglass?
Later, I could just wipe off the grease and throw the dopped
slab in a bucket of water and let the waterglass dissolve. >>

I don't see any problem with this at all. In fact if you have
the patience the water will most likely soak loose the dopped
stone without removing the grease.

<<Could a spray bottle give me enough water to keep the slab
cool and provide the grit cleaning I would need? >>

Here's what I use now that I've abandoned my trusty spray
bottle (no more stopping to spritz the wheel).

First, I procured an IV drip system from one of our
veterinarians. This consists of a bag which holds maybe a
pint of water and a very narrow hose about 3 feet long. I
trimmed the hose end at an angle to produce a slanted end.
he part that makes this system work so well is the "shut
off". It consists of a small roller and a thumb wheel. As the
thumb wheel is turned the roller partially closes the hose.
As with any IV it can be adjusted to deliver as little as one
drop of water every few seconds, up to a continuous stream.

When I'm finished and I know I might not be coming back for a
while I empty the bag because I was cautioned that leaving
the roller fully closed too long will permanently pinch the

The bag has a hole at the top for suspending the IV from a
hook. I just stuck a nail in a shelf over my head and hung
the bag. Any hook will do as long as the bag hangs above the

Next I secured a length of straightened coat hanger extending
down from the same shelf until it is near but not touching
the wheel. To this I attached the hose. Now the end of the
hose rests gently against the turning disc and delivers as
much or as little water as I deem necessary for the sanding
work. Change the orientation of the hose by bending the coat
hanger slightly.

Now, I have a question...

Feathering glue? What is this? I too change paper on a single
6" sanding disc. I have attached a circle of surfer's wetsuit
to my sanding disc as a backing cushion for wet/dry paper. I
used this set up to work out flat spots from grinding. I used
contact cement to attach the sheets of paper but it has given
me so many problems I pretty much do all my sanding by hand
now. Would this Feathering glue provide adhesion when a stone
(opal what else -grin-) is pressed into the paper?

Russ Madsen, Long Beach, California
The American Opal Society

non-commercial republish permission granted

Subject: RE: Vertical Flat Lap Problems

My Thanks to all on the list who have given me advice and
tips on this subject.

Just for future reference, I'm going to use Hale's advice
on a door handle shaped dopstick. And I'm going to dop up a
bunch at once using Waterglass...that way, when I feel one
is getting wet, I can go to the next one while that one
dries out. If you're interested, I will let the Digest know
how I made out....assuming I survive! :)

Thanks again all and take care...........Dave

Dave Daigle, Edmonton, Alberta
The Edmonton Tumblewood Lapidary Club

Subject: RE: Mud Saw

When I first started rock collecting in the early 70's there
was a mud saw in operation in Antwerp, New York. It did not
use a wire! The gentleman had taken a 6-foot cross-cut saw
(used in logging), turned it upside down and used the edge
without teeth (he just needed good steel), hooked up a
refrigerator motor with some gearing which I did not examine
closely (the blade went back and forth but not entirely
without some up and down, too.), made two guides to hold it
vertical, hung a weight on the opposite end, and rigged a tin
can with a hole that dripped grit (mud) on the blade and a
catch basin so he could recycle the grit mix. The rock sat in
the yard on blocks and the saw was installed around it. He
was cutting a 3-foot rock, but I have no idea what it weighed
on how long it took (takes). If you use this info remember
you will need two drip cans for a geode.

Dave Millis

Subject: RE: Comments on BIO: Raymond Rodebaugh

Dianne Karg wrote:
<<I was told by my network administrator that putting quartz
near your computer is an absolute no-no! Apparently the
vibrations of the quartz (even ones as small as in quartz
analog watches) can cause distortions on your hard drive.
Has anyone else heard of this? >>

No way!! I am stepping over hundreds of kilos of Quartz to
get to my computer and no hard drive problems. Lots of
operator error!

Mark Liccini

Gemstone Rough Dealers since 1970 U.S.MAIL
E-Mail: 107 C.Columbus Dr.#1A Jersey City,N.J.07302
Voice Mail/Fax: 201-333-6332

Subject: RE: Comments on BIO: Raymond Rodebaugh

Well, if the X-rays used in airport security scanners don't
affect the hardrives in laptops, they I seriously doubt some
unproven "vibrations" in nearby quartz crystals will have
much effect. Any rockshop owners with computers in their
stores want to comment? The storage mechanism on a hard
drive, is basically a film of atomic level magnets. It
takes a magnetic field to affect it (that's what hard drive
read/write heads do).

Anyway, every computer has at least one oscillator component
in their circuitry somewhere. At its heart, this oscillator
has a carefully calibrated piece of quartz crystal.

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