Hi Guys, I Just Purchessed A Lathe And Want To Convert It To Cnc. I Know Quite Abit About Steppers But Nothing About Servos. From What Ive Read Here On The Zone Servos Are The Way To Go And I Want To Go With Them Instead Of Steppers. If Anyone Can Point Me In The Right Direction I Would Greatly Appreciate It. The Lathe Size Is 12 X 40 And I Want It To Be Quite Powerfull. I Will Be Machining Mostly Steel So It Has To Have Lots Of Power To Cut Through All Kinds Of Steel. Thanks For Reading.
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09-26-2006, 12:12 AM #1
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Need Help Figuring Out What Servos I Need!
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09-26-2006, 01:57 PM #2
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29in-lb is the size used on most CNC knee mills.
Darek
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09-27-2006, 02:01 PM #3
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These are the servo motor sizes used on a commercially built lathe made by a reputable machine tool maker with a bed size roughly the same size as yours:
X axis @ 19 LB-IN, 3.9 amps, 3100 RPM
Z axis @ 26 LB-IN, 8.6 amps, 3100 RPM
These were SEM's if I recall but there are comparable ones available that are probably cheaper.
You could use the Z axis motor on the X but not vice versa.
Lathe duty operation is NOT the same as that of a mill even though one might think that a lathe is merely a mill laid down on it's side. REASON: Cutter forces invovled are much different.
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09-28-2006, 02:50 PM #4
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NC Cams,
Would you please elaborate on the drivetrain that these motors drive? i.e. is there gearing involved and the leadscrew/ballscrew involved and how much cutting force is then obtained as a result of this torque on the benchmark lathe you are talking about.
Thanks,
Salah
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09-28-2006, 06:48 PM #5
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"Would you please elaborate on the drivetrain that these motors drive?"
Machine is Bridgeport Ezpath lathe.
"i.e. is there gearing involved and the leadscrew/ballscrew involved"
Yes, the information is not in the spec sheets that I have on the machine
"...and how much cutting force is then obtained as a result of this torque on the benchmark lathe you are talking about..."
This is not data/information that is typically published by ANY lathe manufacturer. However, it is/was/should be considered as part of the original engineering that should be done to size the motors and establish the gearing for a lathe or a mill.
Few DIY'ers go to the trouble to figure this out as the procedures are not widely published, if at al..
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