jamesp
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Member since October 2012
Posts: 36,154
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Post by jamesp on Aug 11, 2017 4:31:06 GMT -5
I free handed a rough sphere. The container is 2 inches in diameter. The tile saw pan has constant drip for make up water. It needs a damper to create some back friction and reduce bouncing. Down pressure from a soft spring loaded brush perhaps. It got it darn round, but the obsidian will have bruises. MUST reduce bouncing. Hard agate may not bruise. Interesting first try. Passive. Rollin Stone Pat. Pending
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,154
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Post by jamesp on Aug 11, 2017 5:08:02 GMT -5
Here is an overhead. Note extended square pipes for clamping socket over blade at various heights of contact and blade approach by shifting it to right/left. All thin wall steel, so light weight. Got to figure out a way to dampen movement. Avoid bouncing. Increase constant contact, maintain grind and rotation. Must start with a near sphere to get it rolling. Lots of grinding to get to near sphere. Used obsidian to speed free hand grinding(soft) for test run.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,154
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Post by jamesp on Aug 11, 2017 5:25:20 GMT -5
Another way is a router/lathe duplicator concept. Except slow the lathe rotation way way down for(always) weird shaped rock. Like one rotation per minute. Use tile saw w/blade for cutter. Water management a problem. Messy.
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Post by orrum on Aug 11, 2017 6:39:48 GMT -5
That's very good Jim!!#
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Post by orrum on Aug 11, 2017 6:41:14 GMT -5
What if it bounced off a grinding pad? Doesn't have to be wet..use pvc pipe so no bruises. You are onto something my friend!!!!
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notjustone
spending too much on rocks
Member since January 2017
Posts: 426
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Post by notjustone on Aug 11, 2017 9:40:50 GMT -5
what if you shortened the pipe and just used the palm of your hand to roll rock randomly? ill probably attempt something like this soon as my near sheres aren't really all that round. I just been busy with work and getting some stuff done for my blacksmith meeting this sunday.
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Post by captbob on Aug 11, 2017 9:57:37 GMT -5
Now that's entertainment! This place would be boring as hell without jamesp
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,154
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Post by jamesp on Aug 11, 2017 11:18:50 GMT -5
What if it bounced off a grinding pad? Doesn't have to be wet..use pvc pipe so no bruises. You are onto something my friend!!!! So that stone is rolling pretty slow. At 3600 RPM the wheel surface speed is 75 MPH. So the speed difference is huge. I believe the obsidian is chipping a bit when it hits that whizzing wheel after a 1 inch drop. The bouncing on the high speed wheel may be the source of the bruises Bill. What to you think ?
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,154
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Post by jamesp on Aug 11, 2017 11:23:24 GMT -5
what if you shortened the pipe and just used the palm of your hand to roll rock randomly? ill probably attempt something like this soon as my near sheres aren't really all that round. I just been busy with work and getting some stuff done for my blacksmith meeting this sunday. I want you to walk away from it notjust. Let it do it's thing whilst you are watching TV. Ideas ? something with springy down face. Hand would work, but it makes you work it. I am not sure how near to nearsphere the rock needs to be. Sure would be nice if it would work on a less round stone like they are in the real world.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,154
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Post by jamesp on Aug 11, 2017 11:25:14 GMT -5
Now that's entertainment! This place would be boring as hell without jamesp Man it's been a long time since I scored a Captain point. May stimulate others to such insanity.... Where is that dude that's eating popcorn ?
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notjustone
spending too much on rocks
Member since January 2017
Posts: 426
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Post by notjustone on Aug 11, 2017 11:36:45 GMT -5
what if you shortened the pipe and just used the palm of your hand to roll rock randomly? ill probably attempt something like this soon as my near sheres aren't really all that round. I just been busy with work and getting some stuff done for my blacksmith meeting this sunday. I want you to walk away from it notjust. Let it do it's thing whilst you are watching TV. Ideas ? something with springy down face. Hand would work, but it makes you work it. I am not sure how near to nearsphere the rock needs to be. Sure would be nice if it would work on a less round stone like they are in the real world. I don't know anything with any amount of down force might inhibit it from rolling in a random pattern.
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notjustone
spending too much on rocks
Member since January 2017
Posts: 426
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Post by notjustone on Aug 11, 2017 11:44:31 GMT -5
if your pipe was a little taller I would say maybe a water soaked sponge wedged in it. not actually touching buy just high enough to keep it from hopping.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,154
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Post by jamesp on Aug 11, 2017 11:51:44 GMT -5
if your pipe was a little taller I would say maybe a water soaked sponge wedged in it. not actually touching buy just high enough to keep it from hopping. I'll try that. And some other down force materials. It could use something with shock absorber effect like your sponge idea. That blade is screaming fast at 3600 RPM.
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notjustone
spending too much on rocks
Member since January 2017
Posts: 426
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Post by notjustone on Aug 11, 2017 11:54:08 GMT -5
check your fb I sent you a pm with a pic of my near spheres so far.
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notjustone
spending too much on rocks
Member since January 2017
Posts: 426
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Post by notjustone on Aug 11, 2017 12:00:32 GMT -5
I guessing sponge like the big oversized car washing ones real soft and compressable comprisable compresable damnit squishy. easily shaped into 2 inch cylinder and readily available anywhere.
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Post by fantastic5 on Aug 11, 2017 12:22:15 GMT -5
jamesp Oooh...oooh...I want to place an order just as soon as you have this worked out!!! DH has wanted to make spheres. He free hands them and does a damn good job, but this would be a great xmas present. So get on this, I need one by xmas. (insert a whip crack gif here) Please and thank you
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Post by Rockoonz on Aug 11, 2017 12:34:16 GMT -5
what if you shortened the pipe and just used the palm of your hand to roll rock randomly? ill probably attempt something like this soon as my near sheres aren't really all that round. I just been busy with work and getting some stuff done for my blacksmith meeting this sunday. Some early sphere machines were just a single cup on a rotary flat lap, either diamond or steel filled with slurry. Operator used their hand to create random motion. would need to have a pretty close near sphere to start with.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,154
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Post by jamesp on Aug 11, 2017 16:45:53 GMT -5
jamesp Oooh...oooh...I want to place an order just as soon as you have this worked out!!! DH has wanted to make spheres. He free hands them and does a damn good job, but this would be a great xmas present. So get on this, I need one by xmas. (insert a whip crack gif here) Please and thank you Remind me not to get under your command. Well, your worth it Ann. Easy on the whip though. Let's hope this thing works out. Really do want to figure a way to do small to medium spheres. Especially on a cheap tile saw. Like limiting my resources so the project is on a budget. Anything is possible except that darn river dropping in level. No longer teasing about that, it's not looking good. Take it easy on Paul and the home renovation, no whips please.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,154
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Post by jamesp on Aug 11, 2017 16:52:19 GMT -5
check your fb I sent you a pm with a pic of my near spheres so far. They are amazing spheres, please post them. Interesting FB stuff, you guys have a good time. If you are are ever in the hood please stop by.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,154
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Post by jamesp on Aug 11, 2017 16:57:21 GMT -5
what if you shortened the pipe and just used the palm of your hand to roll rock randomly? ill probably attempt something like this soon as my near sheres aren't really all that round. I just been busy with work and getting some stuff done for my blacksmith meeting this sunday. Some early sphere machines were just a single cup on a rotary flat lap, either diamond or steel filled with slurry. Operator used their hand to create random motion. would need to have a pretty close near sphere to start with. I sure do want to make one that is passive and requires no baby sitting. Or fast with babysitting. Less than 3 inches since they require way less removal of material.
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