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vwfence has rocks in the head Member since January 2013 Posts: 566	RPM Jul 17, 2023 13:09:15 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by vwfence on Jul 17, 2023 13:09:15 GMT -5 im curious as to what rpm everyone is running on there sphere machines

jm
having dreams about rocks

Member since October 2015
Posts: 56

RPM Jul 17, 2023 14:16:49 GMT -5 rockjunquie and jasoninsd like this

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Post by jm on Jul 17, 2023 14:16:49 GMT -5

For my machine, I vary the rpm depending on the size of the cups I'm using. I run them as fast as I can without throwing slurry outside the catch basin. I use an old oil changing pan for a catch basin and turn up the speed until the drops of slurry are hitting the side of the pan without going over the top. The machine could handle higher rpms, I just don't want to deal with the extra mess.

I have seperate speed controllers on each motor so I can dial the rpm to exactly what I want. My theory is that higher rpm (within reason) will cut down on the grinding/polishing time and allow me to make more spheres.

I've never checked the specific rpm, but for larger cups (in the 4" range) it's probably in the 75-100 rpm range. For smaller cups (1-2") it's probably double or triple that.

I also slow the rpm's down when I'm doing the initial grind on a rough preform to keep it from popping out. I'm still guessing here, but on a rough preform the rpm is probably under 50.

DirtCleaner has rocks in the head Member since September 2013 Posts: 598	RPM Jul 24, 2023 9:30:38 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by DirtCleaner on Jul 24, 2023 9:30:38 GMT -5 105.7 rpm on my old slow speed machine. I also run a Highland Park HSSM and it whirls around at about a million rpms.
	Last Edit: Jul 24, 2023 9:30:51 GMT -5 by DirtCleaner A FINE PIECE OF JEWELRY DOES NOT START IN A SHOWCASE www.superiorlapidary.com

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Welcome to the Rock Tumbling Hobby Forum where we share a love of rocks and a sense of community as enduring as the stones we polish. The RTH Forum of www.RockTumbling.com is an Amazon Associate site and we earn money from qualifying purchases you make after clicking on our links such as this Rock Tumbling Supplies on Amazon link for instance, or any of our various product ads and banners. By clicking our links every time you begin your Amazon shopping experience, you are generating a bit of revenue for the forum which helps us cover our expenses. Thank you for your support!