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Messages - FlashGP

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Cabbing and More / Re: Stabilising / filling with sodium silicate
« on: February 20, 2020, 08:33:53 AM »
Thanks Agatehead,

I didnt realise the material superglue is made from would act as a filler and set in air.

Ask a "Silly" Question / Re: Dopping Stones
« on: February 05, 2020, 07:58:14 PM »
Sorry Faceting Frank, I forgot to say its is for cabbing not faceting.

Ah, I was having trouble with brown wax for faceting.

My green wax works fine for cabbing.  If I have trouble with it starting to lose its stick  I roll a few flakes of orange shellac into it when it is hot enough to be plyable.

Ask a "Silly" Question / Re: Dopping Stones
« on: January 29, 2020, 09:15:48 PM »
Thanks guys,

I'll mix up some shallac for another go.  The last lot I tried this with was shellac I had used for my plaited belts.  It is a little thinner than shellac for french polishing.

I think I saw some orange flake shellac on my tool cupbpard.  If I can't find it, I'll need to buy some more.

Happy faceting

Ask a "Silly" Question / Re: Dopping Stones
« on: January 28, 2020, 07:25:35 PM »
I have hat that problem with Brown faceting wax as well and an stsrting to think it has a use by date

Ask a "Silly" Question / Re: Can you refreash laps?
« on: January 22, 2020, 08:08:33 AM »
Antibacterial Palmolive Dishwashing liquid with lemon is acidic enough to brighten your lap without pitting it if you use it straight with a scourer or a bit of cuttlefish and wash it off straight away.

Don't let it sit on the lap for long.  I pit a couple of shallow pits on the surface of a zinc lap (zinc is more reactive) when I put it down covered in detergent to run an errand.  Two drops of water hit the surface and in the 5 minutes I was gone, reacted with the zinc pitting it.

The pits were shallow and have since burnished out with euccessive cleaning and dressing of the lap.

Hi Alan,

Get in contact with Peter Stringfellow or Gary Gatfield when he is at NBLC and have a chst to either of them.  They can point you in the right direction.

See you at the February Motrton Bay Facetors Group meeting.


Ask a "Silly" Question / Re: facet cutting speed
« on: January 20, 2020, 07:17:09 PM »
I sourced my 150w 12v dc motor from them.

Hi Kylie, there are several lapidary clubs in Brisbane, all have faceting nachines. 

Some have waiting lists, but depending on his level of experience he may be able to find a club with a machine he can use at the club while waiting for a machine to buy.

Let me know your grandfather's location and I'll give you a list of local clubs.

Also, try contacting Gemcuts in Balina.  Brian boughtvthe Gemmaster business lastcyear and has been fitting dc motors to older motors.  I understand he is gearing up to make new Gemmasters, but maay have heard of 2nd hand machines for sale.

Ask a "Silly" Question / Re: facet cutting speed
« on: January 14, 2020, 09:04:30 AM »
12v power supplies range in price.  A conventional transformer based power supply to drive a 120w 12v motor  can cost more than $500 for parts and an electrician to build ut.  The big cost is in the transformer which is big and heavy.  But they are robust.

As a rule of thumb, you need about twice the wattage in your power supply as in the motor.  E.g . 120w motor needs a 240w supply.  At 12v that is 20 amps.

This is because at low speeds the motor impedance is lower so it draws more current.

BUT you can buy a Chinese 25Amp (300W) switched mode 12v supply for about $35 from Banggood if you don't mind waiting 6 weeks for it to arrive.  Aussie electronics suppliers have them as well but a little bit dearer.  If you blow a couple, it us still cheaper than a traditional supply.

 You should keep them under a little load for a longer life.  I use a 10w 22 ohm load resister across the 12v rails.  It dissapates 6w.  But a 33 ir 47 ohm resistor would be better, it wouldn't get as warm.

A 40amp reversable pulse width modulator (speed controller) costs abt $15 from banggood.

All up my power supply for my concave machine cost me about $100 to build, including a housing (half the price) and terminals and fuses (I put fuses on both speed controllers as I only have 10 amp wiring as my concave machine has 2 motors, both less than 60w.  My 2nd speed controller was a single direction 10 amp pwm costing abt $4.  It regulates oscillation speed.  You don't need it for a faceting machine.

I over rated the supply as a 25amp supply is only a few dollars dearer than a 10amp supply, and if I needed a bigger motor, I don't need a new supply.

I also have a 150w 12v motor as a spare for when my faceting machine motor blows.


Gemstone Faceting / Re: Looking to buy a Patriot machine. Any comments?
« on: January 09, 2020, 07:27:04 PM »
Hi Ghost,

Bunnings sells 1/4 inch aluminium rod in metre lengths for abt $6.

At a pinch your club member msy be able to make his/her own dops u ntil they can source brass ones.

The Hall dops are the perfect size for making bullets for 303 rifles as they are about a thou under the bore size.   >:(

I have been thinking of making some 25cal concave cutter mandrels from the aluminium as I don't have a lathe, but it should be relatively uniform in diameter.  Being soft it should take a good charge, but may need to be recharged after a couple of stones.

Any thoughts?


Gemstone Faceting / Re: Info on Batt Lap
« on: January 09, 2020, 07:07:50 PM »
Lapping it on wet and drt on a glass surface works fine and is faster than lapping a metal lap.

  Andrew at Aussie Sapphire can also machine it for you.

Forum Announcements & Rules / Re: Christmas
« on: December 20, 2019, 07:04:32 PM »
Aye, merry Chrjstmas to one and all. 

Lets hope for some rain in the fire affected areas to regenerate the bush.

Gemstone Faceting / Re: Info on Batt Lap
« on: December 20, 2019, 07:02:43 PM »
It looks like a Darkside Lap.  Jon (Gearloose) Rolfe makes both.  It is pollible it has been mislabled

The Darkside is a ceramic lap good for a wide range of hardnesses.  Magic with oxides as well as quite good for use with Diamond.

Use microscopic amounts of polishing compoind.

I apply 2 squirts of diamond to a facewipe, then a few drops of extender to the facewipe and waive it over the surface of the spinning lap, actually I use the facewipe to clean the lap, this transfer s a  invisible amount of polish to the lap, that is sufficient.

If using Bat Stick, draw a ring near the centre of the lap and slow drip water  on it, what flushes over the lap is enough to polish with.  Periodically renew line.

Happy Faceting

Gemstone Faceting / Re: Stepper motors Fantasy machines
« on: November 18, 2019, 07:14:39 PM »
Welcome to the forum Gasdasmi.

I am not quite sure what you are asking.  Would you please elaborate?


Gemstone Faceting / Re: please advise on lap choice
« on: October 31, 2019, 07:34:49 PM »
Thanks Frank,

I'll give it a go on the next stone I polish.  I am about ready to convert my BAT lap into a prepolish lap because it keeps glazing up and throwing small specs of lap surface while polishing with 100k diamond.

I'm blaming subsurface damage from the initial cut nrrded to temove diamond when I had it machined.

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