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Messages - MakkyBrown

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Hi Flash,
I'll donate a copy of Volume 2 for a prize next year if you want. If anyone is interested I have finally got some copies delivered from the printers. It has been an epic wait.

Gemstone Discussions / Re: Facet design wanted
« on: May 28, 2020, 09:52:06 PM »
Just been looking at it, I'll have another go tomorrow. Think I can make it a bit tidier.

Gemstone Discussions / Re: Facet design wanted
« on: May 28, 2020, 09:01:10 PM »

I think we'll call you the master of design.

I couldn't design a stone like that.

Regards Gordon
I don't know about a master lol. The Elephant can be improved and may be quite tricky to cut.
But book 3 is going to be very impressive imo lock down has been prefect for designing.
Anyone that has requests let me know I'll have a go designing anything :)MB

Gemstone Discussions / Re: Facet design wanted
« on: May 28, 2020, 04:23:23 PM »
Hi Rusted,
I agree the design may be able to be simplified a bit. but atm he pavilion needs to be as it is as it spaces the crown facets. Crown facet spacing is critical for it all coming together.  I will have another go sometime, it would have to be one of the most time consuming designs I've worked with.CheersMB

Gemstone Discussions / Re: Facet design wanted
« on: May 27, 2020, 03:01:54 PM »
Hi Moth,
I had to give up on the instruction as I wrote them too many times then had to redo after changes. It became really time consuming trying to annotate and order the 41 crown tiers. So I've made you a big diagram to work from. Work from the edge in. If you take your time the majority will now meet point.I had a number of .gem files become error and unable to open them. Pavilion/girdle sequence is not labeled or order how I would like but I'm not going to redraw it all again lol atm. As the last .gem file I was using became corrupt and only now opens in GCS.
I have just sorted the crown tier in order of descending angles, your cutting order will change at times as you reference the larger diagram.
It might look cool if you polish crown tier 27 as well as the eyes. Up to you.
If you would like cutting instruction I will do them but need a break from this for a bit. :)

Gemstone Faceting / Re: Concave Cutter
« on: May 24, 2020, 10:12:41 PM »
Once I have it setup properly, I should be able to cut to depth on the encoder. Can't atm as the carriage is not running true and I need to shin the horizontal rails a bit. Once that is done it will be like cutting a facet.Also having the faceting head locked up makes it harder to inspect facets, I had to stand up and look down on the stone.MB

Gemstone Faceting / Re: Concave Cutter
« on: May 24, 2020, 05:25:05 PM »
Well that didn't go to well, I chipped the cutlet on the collet chuck. Encoder is skipping steps and I lifted the handpiece up when i shouldn't have.  :'(
Takeaways.Using 1/4" shaft as the mandrel.
-3k on brass cuts really nicely
-100k on aluminum looks to polish, thought my lighting is not the best but doesn't look bad.
-100k on brass doesn't polish and leaves circular marks
-1/4 in not forgiving and easy to notice if it has walked very slightly when starting. I suspect this is the reason 1/4" is not commonly used. I may also need to upgrade to a hard stop. 
-Need to start really gently, cutting a flat first would have helped.
The machine needs modifying and upgrading to a more powerful processor so i can make full use of the encoder and so it doesn't miss steps.

Stone wise, a bit of a disaster. But the machine has potential with modification. To be able to cut on brass and polish on standard aluminum, I'll be happy with that.The cut with 3k on brass is fairly aggressive, I'm not sure if going straight to 100k on aluminum will pollish harder materials. The 1/4" aluminum is also a bit flexible.  When i make mandrels in larger diameters I'll use a brass center.
Sorry Flash I won't be able to enter, even if i had time to recut I need to do machine mods first. :(

Gemstone Faceting / Re: Concave Cutter
« on: May 23, 2020, 09:43:56 PM »
Farout Frank, that is a serious amount of time. So it really is a quest for perfection. I'd imaging you'd then keep notes on each facet as you cut the stone.

I wish you lots of success after investing so much time.

Gemstone Faceting / Re: Concave Cutter
« on: May 23, 2020, 06:09:40 PM »
How long do you and others put into cutting a competition stone ?
I've cut/polished the pav/girdle(without concave facets), one meet I might have to push a bit. But it is all a case of how much magnification do the stones get inspected under. And what counts as rounded facets. I know it's 10x but 10x seem to be a bit variable. I use a 20x lens out of a camera but no idea what it really is.
Did you take the sharp edge off to help the concave facets start? I'm a bit concerned as I have no stop to cut against and am just going to lock the head pivot up.
Bit frustrating cutting with no time as I'll have to enter it with faults if I somehow manage to finish it. Like discovering a veil in the stone when polishing and having to polish on my go to tin lap that is well over due to be machined. Tomorrow I'll give the concave a go.

Gemstone Discussions / Re: Facet design wanted
« on: May 22, 2020, 03:52:35 PM »
Hi Moth, I haven't forgotten hopefully I get it done of the weekend.CheersMB

Gemstone Faceting / Re: Concave Cutter
« on: May 21, 2020, 11:28:38 PM »
I'm sorry Flash for not having tried to cut the stone sooner. I was going to earlier in the week but I got a flue shot, and I've never had such a sore arm from one before.

Those bearings are great aswell no play. Great seeing original thought. Nice sliding the stone into glue.
Machine looks ok, looks like he has done his own anodizing aswell. Linear bearing on the mast.

Gemstone Faceting / Re: Concave Cutter
« on: May 21, 2020, 10:17:49 PM »
Hmm, thinking now posting on Monday will probably be too late as only 4 days available after posting. I suppose my only chance is if I have time to cut it tomorrow and have it in tomorrows mail.

Gemstone Faceting / Re: Concave Cutter
« on: May 21, 2020, 06:44:45 PM »
I was thinking if i posted Monday it would be fine, but perhaps not.  Given how slow the rest on my mail is atm.

Gemstone Discussions / Re: Facet design wanted
« on: May 19, 2020, 01:52:38 PM »
Ok, I'll see if I can sequence it for you :)

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