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Author Topic: faceting machine digital microscope setup  (Read 139 times)

Faceting Frank

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faceting machine digital microscope setup
« on: May 02, 2021, 09:39:57 AM »
Will start a new thread on my scope.

This is the latest on my scope setup.
Made a new mast from 12mm plywood 500mm high, needed the slot to go that high. Kept the same dressed timber boom, but extended the slot. The small piece of wood under the boom is a guide to maintaining the boom angle.
The boom angle is relevant to the facet angle and to get that I put my magnetic based digital protractor on the boom and roughly set it up. Because the protractor is heavy it has to come off and the small piece of wood is set at that angle. Then I can setup the boom accurately knowing I still have the correct angle.
Made a more robust base out of aluminium for the mast, made the fine adjustment setup at the end of the boom out of an old 7mm thick chopping board. Have a mill/drill so could mill all the parts so they were accurate.
 Having it made out of light weight material makes it a lot easier to move it into position while just looking at the screen.
The white labels I’ve stuck on it let me mark homing positions for the facets and they will come off when the stone is finished.
Still using whatever I find laying around to make it.

The angle the scope is pointing inward from the boom is about 45deg, there may be a more optimal angle than that. Its to do with keeping the mast height and boom length down in size.



Faceting Frank

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Re: faceting machine digital microscope setup
« Reply #1 on: May 02, 2021, 04:11:52 PM »
Scrapped the plywood mast and made a new one out of MDF. Everything was working fine till I changed laps, then the screen started to blur a bit at mid plus speeds. Would be fine if I held the mast, never had this problem with my old MDF mast. 

Faceting Frank

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Re: faceting machine digital microscope setup
« Reply #2 on: May 04, 2021, 03:56:54 PM »
Thought I would add a couple of pics from my old thread to this one. These are the stone at the 1200 grit stage and polished, the stone is a C Z 11mm dia. And the cut is a standard brilliant crown.

Faceting Frank

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Re: faceting machine digital microscope setup
« Reply #3 on: May 04, 2021, 03:58:21 PM »
The stone I’m cutting now is a much more difficult cut and the view is looking at the pavilion with a sloping girdle. This is at the 1200 grit stage. The facets A, B, C, are only one index away from each other, the same goes for the girdle facets D and E. Have cut D and cutting E to meet up with the meet point between A and B.
One of the problems I’ve had from the very beginning of using a scope to facet with is getting the light just right so I can easily see the facet edges. Experimented with a few things and this is easily the best. Rubbing the stone with a 2B pencil, no side light, just daylight and the scope light.
To give you an idea of the scale of this, the computer screen is 380mm across and you’re looking at one half of stone 13mm wide.

MakkyBrown

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Re: faceting machine digital microscope setup
« Reply #4 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

Faceting Frank

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Re: faceting machine digital microscope setup
« Reply #5 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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