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General Mach Discussion / Re: Mach 3 & Lathe Spindle Encoder Recommendations
« on: July 09, 2009, 12:00:34 PM »
Thank you for all the replies!
Sounds like an AC Servo is the way to go.
There is some posistional data loss when using anything but a direct drive coupling system, but if Mach 3 will work with a Servo that'll be more than close enough for my work.
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I, and a bunch of my friends, do model building that often requires very small pins and screws. Here's what I posed on the CNCZone.com forums when asked this same question:
Here's a link to the thread at the CNCZone if you're really bored. :-) http://www.cnczone.com/forums/showthread.php?t=84133
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Thank you again,
Curtis F.
Sounds like an AC Servo is the way to go.
There is some posistional data loss when using anything but a direct drive coupling system, but if Mach 3 will work with a Servo that'll be more than close enough for my work.
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Curtis,Rich,
Curious, what are you turning at 30,000 RPM??
I, and a bunch of my friends, do model building that often requires very small pins and screws. Here's what I posed on the CNCZone.com forums when asked this same question:
Quote
The Machinery's Handbook 26th edition says; when cutting Brass with a Carbide cutter the optimal Surface speed is in the 440 to 1170 Feet Per Minute range.
The major diameter of a #0 thread is: .060"
The major diameter of a #2 thread is: .086"
The major diameter of a 1/2" thread is: .500"
Therefore:
Optimal RPM for turning the major diameter of a #0 screw is: 28,000 to 75,000 RPM
Optimal RPM for turning the major diameter of a #2 screw is: 20,000 to 52,000 RPM
Just for comparison;
Optimal RPM for turning the major diameter of a 1/2" screw is: 3,400 to 9,000 RPM
After researching bearings a little I found that the off-the-shelf ones of the size needed to fit around a 5C collet spindle (45mm I.D.) topped out at a little over 30,000 RPM if oil lubrication is used.
Here's a link to the thread at the CNCZone if you're really bored. :-) http://www.cnczone.com/forums/showthread.php?t=84133
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You should check out the thread "Success, mini machining center . . . " in this forum. I just finished building what amounts to a lathe head using a 5C spindle and it is servo driven. You might get some ideas there.I'm going to read that right now!
Thank you again,
Curtis F.