Hi! Been lurking around here for some while now! So i better say hi now! HI!
Short intro: Read Tom Herbst books, excellent read! this only made me more curious about faceting, there was really no turning back, i knew i was sold after viewing the first faceting video on youtube! Got a machine from jarvi tool in October and have been cutting ever since! I Love it!
Anyway i read a lot of articles/tutorials about faceting and they all refereed to RPM, witch is the only sensible measure to use with all the different brands, but i never managed to find rpm information for my faceting machine. Brought a tachometer home from work today to measure. Posting my results here in case anyone else is also wondering about this.
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Joined: Fri Jun 25, 2010 12:04 am Posts: 257 Location: Idaho
The top speed of a Facetron can vary as supplied from the factory. It is also easily adjusted by the user. I have heard the top speed can be set at over 2,000 RPM.
Do this at your own risk of injury, death, or damage to your machine.
Joined: Mon Aug 20, 2012 11:32 pm Posts: 1747 Location: Florida, United States
abeck wrote:
The top speed of a Facetron can vary as supplied from the factory. It is also easily adjusted by the user. I have heard the top speed can be set at over 2,000 RPM. Do this at your own risk of injury, death, or damage to your machine. http://www.gemologyonline.com/Forum/phpBB2/viewtopic.php?f=8&t=17204&hilit=facetron+speed Just recently used this to adjust a new one which had a very low top speed. Allan
Ah, so there is a dc motor control board with a maximum speed pot.
Great info abeck! I have also noticed that the speed varies after the machine has run for some time, My graph was made on a cold machine, when i control checked the rpm after an hour or so of running the values where 30 - 50 rpm higher.
Joined: Mon Aug 20, 2012 11:32 pm Posts: 1747 Location: Florida, United States
alex3d wrote:
Great info abeck! I have also noticed that the speed varies after the machine has run for some time, My graph was made on a cold machine, when i control checked the rpm after an hour or so of running the values where 30 - 50 rpm higher.
A high quality control board should not vary that much.
Interesting that the Facetron maximum spindle speed is less than 1000 rpms. Too slow for preforming in my opinion. I prefer 2000 rpms maximum speed.
For me, the optimal cutting speed seems to be about 70% on any of my machines. I really never run them up at full speed, and feel the stone cuts faster at a little slower speed.
You could put an rpm readout on your machine. Cheap(probably less than $20 in bits) and easy to build with arduino products and a hall effect sensor + a few small magnets(i used 4). I have put rpm on my encoder screen
Joined: Tue Apr 05, 2016 7:58 pm Posts: 1424 Location: San Marcos, CA
I never concerned myself with the actual rpm. Slow, medium and fast, anything in between was just so slight of a difference it really doesn't make much of a difference. Like you full speed never used except in spin dry mode. MDR PRO 300C/Jang801 Greg
Joined: Tue Jun 12, 2007 6:41 pm Posts: 5534 Location: Massachusetts, USA
Precision Gem wrote:
Is knowing the actual RPM really that important?
Many people post the speeds they use, but the numbers are not transferable between manufacturers. "6" on a Brand A, Brand B, and Brand C machine may or may not mean anything. "6" tells you where the knob is pointing. I use RPM when making suggestions for my products simply because I have no idea who is reading it or what they have. A person can always use the free strobe disk that is posted on forums once to check their numbers. Or, put a piece of tape on the lap. Feel it with your fingernail. 4 clicks per second sounds like a machine gun in a WWII movie. That's 240 RPM. Ten clicks per second is the rate of a rotary telephone dial, if anyone remembers. That's 600 RPM.
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