3" obsidian sphere

Fossilman Cave Dweller Member since January 2009 Posts: 20,722	3" obsidian sphere Aug 25, 2024 10:30:15 GMT -5 via mobile 1dave and callmerob like this Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by Fossilman on Aug 25, 2024 10:30:15 GMT -5 Nice sphere..
	God,family and life.....

1dave
misunderstood rock expert

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Member since October 2013
Posts: 11,937

3" obsidian sphere Aug 28, 2024 15:59:26 GMT -5 NRG and callmerob like this

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Post by 1dave on Aug 28, 2024 15:59:26 GMT -5

Roundness is natural. All the planets are more or less round, use a plasma cutter on iron or steel and the sparks flying out are round. Rocks moving down stream are becoming round. In a way, a sphere is perfection.

I'm a ROCKOLOGIST !

My Published Books: 1936dave.freeforums.net/

callmerob starting to spend too much on rocks I really like a dirt road Member since September 2019 Posts: 143	3" obsidian sphere Aug 29, 2024 23:16:06 GMT -5 1dave and NRG like this Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by callmerob on Aug 29, 2024 23:16:06 GMT -5 Aug 28, 2024 15:59:26 GMT -5 1dave said: ... a sphere is perfection. Agreed. Even Plato liked 'em. That Plato guy - he's alright. Will usually do you a solid, man.
	Last Edit: Aug 29, 2024 23:22:20 GMT -5 by callmerob - Rob.

NRG
fully equipped rock polisher

Member since February 2018
Posts: 1,688

3" obsidian sphere Sept 4, 2024 16:03:17 GMT -5 via mobile 1dave, NRG, and 1 more like this

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Post by NRG on Sept 4, 2024 16:03:17 GMT -5

Aug 28, 2024 15:59:26 GMT -5 1dave said:

Roundness is natural. All the planets are more or less round, use a plasma cutter on iron or steel and the sparks flying out are round. Rocks moving down stream are becoming round. In a way, a sphere is perfection.

If memory arrives; the Mariana's trench and mount everest exhibit less deviation from the sphere than the imperfections on a common chicken egg; as a percentage of the whole.

1dave misunderstood rock expert Awed by the Universe! Member since October 2013 Posts: 11,937	3" obsidian sphere Sept 12, 2024 17:20:30 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by 1dave on Sept 12, 2024 17:20:30 GMT -5 Are you still using the Core bit to make your preforms?
	I'm a ROCKOLOGIST ! My Published Books: 1936dave.freeforums.net/

vwfence has rocks in the head Member since January 2013 Posts: 566	3" obsidian sphere Sept 16, 2024 11:49:57 GMT -5 callmerob likes this Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by vwfence on Sept 16, 2024 11:49:57 GMT -5 If one made a lazy susan type base and used a dial indicator to rotate it you should be able to get a good measurement