Tormach PCNC 770 - Page 7

Chapter 1
7
UM10350_PCNC770_Manual_0916A
Preface
Resolution, Accuracy, and Repeatability
The following table summarizes resoluon, accuracy, and repeatability of PCNC mills as delivered.
Resolution of Motion (minimum discrete positional move) 0.0001”
Ball Screw Positional Accuracy ≤ 0.0006” per foot
Combined Positional Accuracy
1
≤ 0.0013” per foot
1
Includes addional contribung factors such as compressibility of bearings, ball screw windup, fricon, etc.
Each PCNC mill ships with a Cercate of Inspecon. This report details quality assurance
measurements performed at the factory by a Tormach quality assurance team member on each mill
prior to shipping.
A sample cercate of inspecon and more informaon on quality assurance measurements is
available at: hp://www.tormach.com/quality_overview.html
In pracce, accuracy and repeatability are heavily inuenced by the techniques used by the
machinist. A skilled machinist can oen deliver accuracy that exceeds the accuracy specied by
the manufacturer, while an inexperienced machinist may have diculty delivering the expected
accuracy. With this understanding, Tormach cannot predict operator accuracy. Nevertheless, the
accuracy specied by the manufacturer remains an important reference point.
Nomenclature
This manual uses the following typographical nomenclature:
Soware Control
Refers to a Software Control, i.e., an on-screen button
Hardware Control
Refers to a button or switch on mill’s Operator Panel
G-code (e.g., G01X34.8)
Used to show G-code
Key name (i.e., Enter)
Tells you to press the indicated key
Buon name (i.e., Stop)
Tells you to press the indicated button