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Messages - FlashGP

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Gemstone Faceting / Re: Jewelers spectacle magnifiers
« on: April 10, 2021, 07:22:02 AM »
Hi Frank,

It is looking good.  I was going to make a CNC based surface grinder for my laps.  But having seen your Renault’s I now think I’ll be setting up a scope before I do that

Gemstone Faceting / Re: Concave Faceting Diagrams
« on: April 06, 2021, 06:12:32 PM »
Thanks Ghost.

I’ll have a look.

I have been thinking about concave designs and have figured out they are better for light material to increase colour saturation at the expense of sparkle,

Also a good technique to add a highlight here or there.

Gemstone Discussions / Re: Gemboree 2021 Hobart
« on: April 03, 2021, 10:23:43 PM »
Hi Frank,

I'm sorry to see you were the only entrant in the Concave section.  I cut too slowly to enter both the Gemboree and the AFG annual comp.  Am currently working on the crown of my AFG concave entry.  I just have to get the cat hairs out of the table, then I can perfect the meets on the remaining crown facets and polish them.


Show off your Gems / Re: Buy Torrington Emerald
« on: March 27, 2021, 05:27:36 PM »
Bob Kelly in Brisbane had some for sale at the last gem show I saw him attend.  From memory they were not very large.  Maybe cut a 1 or 2 carat stone

For Sale or Swap / Re: Moderate
« on: March 13, 2021, 12:02:12 PM »
Maybe good to check their name on Facebook.  There are a few really good Russian cutters.

Forum Announcements & Rules / Re: ALF running on new host :)
« on: March 13, 2021, 11:58:36 AM »
Hi Makky

Joe Pieczynski has some precision machining videos with a reverse method of thread cutting that is really good for threads next to a shoulder.  The tool starts right next to the shoulder and runs off the job.  The cutter is mounted upside down.


Gemstone Faceting / Re: Jewelers spectacle magnifiers
« on: March 13, 2021, 11:50:25 AM »
Hi Prooz

A microscope has too shallow a depth of field to be any good for taking photos of stones.  Only part of the stone will be in focus

If you use a camera you can get a decent depth of field using f22.

Depth of field is a CC measure of how much depth from the point of focus the subject is reasonably focussed

Gemstone Faceting / Re: Is a lab-created emerald a real emerald?
« on: March 01, 2021, 10:52:15 PM »
It depends on if it has the same crystal structure as natural emerald.  Some synthetic material is simply a glass with the same chemical formula as material it seeks to emulate.  Take for example the synthetics created by the Venuli method (flame fusion) or chrsytanite which was melted chrysophrase but with added chemicals. 

But if synthetic emerald is emerald that has been dissolved and recrystalised, it is man made but still real emerald.

But it should not be called "real emerald" as this is likely to confuse consumers and mislead them into thinking it is natural material rather than reconstituted or man made emerald.   

Gemstone Faceting / Re: Stone Cutting
« on: February 13, 2021, 07:42:24 AM »
Hi Makky,

I still have the diagram and did some modelling.  I can only reduce the angles 5% before it starts loosing its peformance, windowing is more than 30% at all tilt angles after a 10% reduction in angles.

There is some slight damage to the crown, looks like a slip while setting.  I noticed it when I inspected the stone with a loupe.

Gemstone Faceting / Re: Stone Cutting
« on: February 12, 2021, 12:47:46 AM »
Hi Frank,

I'll do a bit of modelling on my cutting instructions and see how it might look. 

The frosted dome is visible as a blob of fuzziness in the stone.  This afternoon the Jeweller suggested he could polish the rounded end.  This would only make the window more noticeable.

Gemstone Faceting / Stone Cutting
« on: February 10, 2021, 10:50:26 PM »
Does anyone know of a Robert Cook at or near Glen Innes who cuts gems commercially?

 My wife was almost in tears tonight.  She picked her new ring up from the jewellers after having a red Zircon I cut set.  When she got home she found the cutlet had been rounded off.  It still pokes through the bottom of the setting into her finger so I am not sure if the polisher wore it away or it was ground off instead of the setting being made taller.

Anyway the jeweller said he could have it repaired by Robert Cook, who cuts Sapphires.  Apparently he can  “repair” the stone without losing any weight. 

Given I redesigned the pavilion to lighten the stone by getting rid of the pavilion fat and lowering pavilion and crown angles, I am dubious about this claim.

So before I let the jeweller have a go at having the stone repaired, I would like to know if the cutter is going to do a proper job, eg measure the angles and cut for optimal brilliance or simply try to hide the window by putting a row of cutlet facets at below CA I where the cutlet used to be.  Otherwise I’ll ask for my money back and compensation for the damage to the stone then recut it myself.

Gemstone Faceting / Re: machine motor upgrade
« on: February 02, 2021, 12:29:08 AM »
Hi Prooz, 

Brushless DC motors need a dedicated controller circuit to run them.   To keep it simple I would go for brushed motors unless of course you can buy a brushless package of motor and controller.


Gemstone Faceting / Re: Combination unit
« on: November 21, 2020, 10:18:36 PM »
Hi Frank,

Have a chat to Brian at Gemcuts.  He has bought the GemMaster designs.  He may know where to source one if he doesn’t make it

Gemstone Faceting / Re: Findings
« on: November 06, 2020, 10:04:46 PM »
Good to know.  I’m lucky enough to just walk into their Brisbane showroom when I can get away from my desk long enough to step outside.

When we order from A & E I ask for them to arrange for me to collect from the Brisbane office and it is generally there overnight or after 1 day at the latest.  It’s cheaper than paying for express post.

Gemstone Faceting / Re: Findings
« on: November 06, 2020, 08:28:05 AM »
Try Pallion, one of the companies in the A&E metals group. 

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