collapse

Author Topic: Emerald Cuts, any tips?  (Read 234 times)

ianRobinson

  • ALF'er Bronze Member
  • *
  • Posts: 20
    • View Profile
    • Email
Emerald Cuts, any tips?
« on: December 18, 2018, 06:40:37 AM »
Am I the only person who finds emeralds cut tricky. On paper they look easy.

 I have just cut the pavilion of a 'Gram Easy Emerald by Jeff Graham'. 'Easy' it wasn't -  I appreciate that long parallel lines are unforgiving but it was a bugger of a job to get the facets aligned. I am tempted to simplify the pavillions down to one or two tiers.

Do you folks have to use the cheater a lot or is it just me?

ian

Rusted

  • ALF'er Platinum
  • *
  • Posts: 321
    • View Profile
    • Email
Re: Emerald Cuts, any tips?
« Reply #1 on: December 18, 2018, 07:39:03 AM »
Try not to use the cheater at all, once you start you are in a death spiral.

If your machine is not out of alignment and your laps are flat the facets should all align.

The cheapish topper laps can warp slightly due to the different expansion rates of the base stainless and the nickel plated layer, I find it best to use solid copper laps for the 3000 14000 steps before polishing, they are (should be) flat the same as the polish lap.

Talking about out of alignment. My club recently bought a used gemmasta. The person that sold it always complained about doing Emeralds, when we got it I had a look, the difference when sweeping a stone across the lap was 120 thousandths of an inch, about a tenth of an inch, there's no way you could cut a stone on that.

MakkyBrown

  • Global Moderator
  • ALF'er VIP
  • *****
  • Posts: 971
    • View Profile
    • Email
Re: Emerald Cuts, any tips?
« Reply #2 on: December 18, 2018, 12:03:31 PM »
Try not to use the cheater at all, once you start you are in a death spiral.

If your machine is not out of alignment and your laps are flat the facets should all align.

The cheapish topper laps can warp slightly due to the different expansion rates of the base stainless and the nickel plated layer, I find it best to use solid copper laps for the 3000 14000 steps before polishing, they are (should be) flat the same as the polish lap.

Talking about out of alignment. My club recently bought a used gemmasta. The person that sold it always complained about doing Emeralds, when we got it I had a look, the difference when sweeping a stone across the lap was 120 thousandths of an inch, about a tenth of an inch, there's no way you could cut a stone on that.
You re-aligned by undoing the do not undo screw? Found a small plastic faced hammer works to gently tap once the screw is loosened a bit.
« Last Edit: December 18, 2018, 12:06:15 PM by MakkyBrown »
We are a family of 4 from Southern Tasmania.

Rusted

  • ALF'er Platinum
  • *
  • Posts: 321
    • View Profile
    • Email
Re: Emerald Cuts, any tips?
« Reply #3 on: December 18, 2018, 12:47:45 PM »
Yep that's the one Makky.


ianRobinson

  • ALF'er Bronze Member
  • *
  • Posts: 20
    • View Profile
    • Email
Re: Emerald Cuts, any tips?
« Reply #4 on: December 30, 2018, 01:25:51 AM »
Thanks for the tips

- you could be onto something as I found the quill was out of alignment. Fortunately it is fairly easy to adjust (late series Polyhedron similar to Polymetric Scintillator).

Cheers

ian

Tags:
 

* Sponsor

HTML Online Editor Sample

ALF is hosted by Aussie Sapphire as a free service to the Lapidary community.

Visit our website here
Phone 1800 50 21 40
Or find us on Facebook

Recent Activities

Dangerous minerals by Orange Pirate
[Today at 09:11:50 PM]


Math Formula by MakkyBrown
[Today at 08:12:12 PM]


403 errors by Orange Pirate
[Today at 07:32:02 PM]


Is Grabben Gullen dead? by Jimnyjerry
[Today at 10:23:54 AM]


Snake Catching by Sandbagger
[January 19, 2019, 08:26:45 PM]


Changing Ball-Bearing on the left side of DP Pixie by olaf
[January 19, 2019, 12:14:16 AM]


Heading to Gemtree & Harts Range by Jamo
[January 18, 2019, 10:06:49 PM]


Any geologists out there? by harryopal
[January 18, 2019, 12:09:53 PM]


Areas around colac by MakkyBrown
[January 17, 2019, 08:53:22 PM]


Crystal structures by harryopal
[January 15, 2019, 04:28:00 PM]


What scales for weighing gold? by Sandbagger
[January 13, 2019, 11:41:38 PM]


Mt Gambier- South Australia Fossicking by Rusted
[January 12, 2019, 03:58:19 PM]

* Calendar

January 2019
Sun Mon Tue Wed Thu Fri Sat
1 2 3 4 5
6 7 8 9 10 11 12
13 14 15 16 17 18 19
[20] 21 22 23 24 25 26
27 28 29 30 31

No calendar events were found.
Sorry! There are no calendar events available at the moment.

* Who's Online

  • Dot Guests: 92
  • Dot Hidden: 0
  • Dot Users: 0

There aren't any users online.

* Find us on Facebook

* Forum Stats

  • stats Total Members: 3825
  • stats Total Posts: 54069
  • stats Total Topics: 5757
  • stats Total Categories: 6
  • stats Total Boards: 27
  • stats Most Online: 160