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24-11-2010 #1
Andrew you have discounted the efficiency of ball screws.
The use of a knee mill is good but the downside is the amount if force needed to move the Z axis.
You could calculate the amount required using a spring balance, have you done this ?
Guys who do Bridgeports use the quill for the Z axis
I do have a Bridgeport myself and did a bit of checking.
The Y axis has an 83mm offset and took 2Kg of force to turn it
The Z axis has an offset of 185mm and took 4Kg to turn it
1000 / 83 = 12.048
1000 / 185 = 5.405
2Kg / 12.048 = .166Nm Required
4Kg / 5.405 = .74Nm Required
.74 / .166 = 4.458 So if the norm was to use a 4Nm motor for the Y axis then amount of force to drive the Z compared to the Y axis would be a 17.8Nm axis motor "4 * 4.458"
PhilLast edited by M250cnc; 25-11-2010 at 12:32 PM. Reason: More info added
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