Recent Posts

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Gemstone Faceting / Re: MB Faceting Machine Build
« Last post by MakkyBrown on May 05, 2021, 11:37:43 PM »
Just been making some parts. Got the spindle hub as good as I can(0.012mm run out), took me awhile as I'm not much of a machinist :)

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Was wondering what a lot was in kilos and can’t wait to see the photos
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no worries, what about a few hundred bucks for the lot and you pay the postage.
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Wanted / Re: fullarton river garnet
« Last post by Emma Barwick on May 05, 2021, 02:13:17 PM »
What type of size are you interested in
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I have a few kilos of raw boulder opals with lovely variety in colours and I am looking to sell some
If you have any interest or questions id love to hear from you I can supply photos and sizes please contact me for more details
beers
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Gemstone Faceting / Re: MB Faceting Machine Build
« Last post by MakkyBrown on May 04, 2021, 06:42:56 PM »
I have purchased lot of stuff. I have planned it all roughly but I am concerned about the index being powered by the stepper I have chosen. The stepper will have an encoder on it which won't drift like the stepper might a bit. But there will be lots of wires and I will have to use a 12 wire slip ring or the wires will get in the way. Incorporating both the slip ring and angle encoder into the faceting head will be a bit tricky. I'm planning on using 1/8 microstepping and am concerned if I'll have enough holding torque to cut facets with. It might be as low as roughly 700-800g/cm. Motor temperature spending lots of hours holding position could see me having to de-tune it more further reduction holding torque. Maybe I need a bigger motor but then it all gets heavier and the weight will start to compromise the action of moving the hand piece when moved up/down etc.
I am going to have to test the stepper indexing first before committing too it. More accurate options exist but then everything gets bigger and more complicated. I may have to revert back to using a standard index wheel which I don't really want to.

MB
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Gemstone Faceting / Re: faceting machine digital microscope setup
« Last post by Faceting Frank on May 04, 2021, 06:23:36 PM »

A light coming from the side or above as you would normally have when faceting works in most cases because the index differences are sufficient to show you the facets. As in the 1200 grit picture of the standard brilliant. They clearly stand out and you can make accurate meet points to a 10x loupe standard.
No good when the indexes are only one apart because the light does not pick up the facet edges. I don't know why the pencil shows the facet edges so clearly, but it does and a light from the side stuffs it up. This is all new to me, so its a case of solving problems when they come up.
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Gemstone Faceting / Re: faceting machine digital microscope setup
« Last post by MakkyBrown on May 04, 2021, 04:35:59 PM »
Can you turn the microscope light off and use another directional light source, that might help.
MB
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