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Lapidary / Gemstone Community Forum
February 22, 2019, 02:23:25 pm
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Graves Preformer Attachment

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Author Topic: Graves Preformer Attachment  (Read 817 times)
Yordi
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« on: April 18, 2015, 01:14:46 am »

Good afternoon,

does anyone have some more information about it. and how it works.
I saw everywhere the same pictures. but there isnít much information around

yordi



yordi help


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dickb
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« Reply #1 on: April 18, 2015, 11:31:16 am »

Do you have this, or only the photo?

This a cab performer and it is used to make duplicate cabs of a particular shape by attaching the rough to a dop and fitting it in the hole in the shaft. The white shape is the cam that rides  against the adjustable stop that determines the shape of the cab as it is rotated by hand while pressing the rough against a rotating grinding wheel on an arbor. The whole metal piece is mounted in the grinder tray in front of the wheel. The white plastic parts are different cab shapes that can be formed on the attachment. You use these patterns to trace the shape on the rough then cut the pattern out leaving the line as you cut it from the slab. Then glue the dop  to the stone, insert the dop and stone into the attachment and grind the stone to shape. Hard to explain in writing, but you may find a utube video that shows you it being used.

Dickb
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finegemdesigns
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« Reply #2 on: April 19, 2015, 09:41:53 pm »

I have this and have used it. Works great for circles. Does not work for ovals if you mount it for a horizontal flat lap. This is probably due to the angle of attack when using a horizontal lap. Ovals come out very slightly off symmetrical.

However this might work if mounted next to a vertical wheel since there would be a more perpendicular contact. I had planned to try this by making a special bracket but never got around to it.

Note: In their advertisement I seem to remember they recommended the vertical setup.

Note 2: There is a motor attachment to run this also.
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Yordi
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« Reply #3 on: April 20, 2015, 11:04:22 am »

thanks for the info. sadly does not fit on the cabking.
have to make my own
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dickb
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« Reply #4 on: April 20, 2015, 11:51:00 am »

I would think you can adapt the Cabking so it will work on the right side arbor. but if I were doing it, I would pick up a used polyarbor and  use it as a dedicated performer machine.

Dickb
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finegemdesigns
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« Reply #5 on: April 20, 2015, 12:59:23 pm »

I would think you can adapt the Cabking so it will work on the right side arbor. but if I were doing it, I would pick up a used polyarbor and  use it as a dedicated performer machine.

Dickb

Wow this is a great idea. Part of the reason I never did my bracket setup was my diamond metal wheel was on the wrong end of my cabbing machine. But a simple dedicated wheel makes much more sense. Once you have the preform roughed out the rest is easy on other regular equipment.

Note: To those just starting to cab, the oval (which ironically is the most ubiquitous and common shape) is also the most difficult to cut with perfect symmetry.
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