401 High Precision Stages and Standard Accuracy Stages (Common) 2About Load Capacity Load Capacity It is a force that the stage can withstand with the CG of the load is the stage center. The unit is in (N). If the stage is operated at beyond this load capacity, it may no longer operate smoothly. For the load capacities in horizontal orientation, see [Horizontal] values, and see [Vertical] values for the vertically oriented stages. Please be advised that vertically oriented or inverted stages may not always meet the catalog accuracy values. Allowable Moment Load It indicates loads the stage can withstand when the CG of the load is located away from the stage center. The unit is in (N t m). When CG of the workpiece is located away from the center of the stage (=Overhung), the allowable moment load values will need to be taken in consideration along with the Load Capacity. Products high in this value is defined as [High Rigidity]. 2About Accuracy Standards Definition of Straightness Straightness is a value represented by a maximum difference between an ideal straight line of travel and the actual travel of a top plate over the entire stroke range of the stage. It is the max. deviation in horizontal or vertical direction in relation to the ideal straight axis. t Straightness (Vertical) Measurement A stage is fully stroked with a dial indicator placed and a vertical displacement is measured. Definition of Pitching / Yawing / Rolling These indicate the amounts of top plate inclinations during linear motion. To direction of traveling Leaning forward and back : Pitching Rotation in a horizontal plane : Yawing Leaning right and left : Rolling Allowable Moment Capacity (see Overview page) and Moment Rigidity (carriage attitude in angles against these forces) are used to represent the stage's rigidness. Roll Pitch Yaw 2About Resolutions There are 3 ways of position reading options: Scale Plates, Vernier Scale and Micrometer Heads.These position indicating options can be used as references for applications requiring positional repeatability. <How to Read Vernier Scale> The scale B value is read at the 0 position of the subscale A in 1mm resolution. (30mm in the right figure) While looking at A scale, read the graduation C aligning the B scale as 0.1mm resolution. (0.6mm in the right figure) A sum of and is the value. (30.6mm in the right figure) & Although the micrometer head stroke will be expressed ±3.25mm and ±6.5mm, the scale starts as 0 (zero) at the left farthest end. For the case of ±6.5mm stroke, the relationship of the scale and the stroke would be as shown below. t When the scale reads 0 (zero): Stroke [-6.5mm] t When the scale reads 6.5mm: Stroke [0 (zero)] t When the scale reads 13mm: Stroke [+6.5mm] <How to Read 0.01mm Micrometer Head> Read where the position of end face of the thimble is located on the scale of sleeve by 0.5mm resolution. (11.5mm in the right figure) Read a value of the thimble on the position where the base line of sleeve coincides with the scale line of the thimble. (0.36mm in the right figure) The total value of and is the current position of the stage. (11.86mm in the right figure) A B C Enlarged View of "a" a C Thimble Sleeve Base Line of Sleeve 40 35 45 40 35 30 Enlarged View of "a" a Definition of Parallelism A value indicating the parallelism of the top surface against the bottom surface. The illustrations on the right show how Static Parallelism and Dynamic Parallelism are measured. &Caution Travel accuracy values shown are for single axis configuration. * (Measurement of Static Parallelism) (Measurement of Dynamic Parallelism) * The stage is fully stroked and measured. 2 About Stroke (move distance) descriptions. The dimensions shown in the drawings are for tables at 0mm positions. The dimensions shown in ( ) mean that they would change as the stroke changes. Below diagram [XWG60] as an example, the stroke is ±21mm (42mm) where the table moves 21mm to the right and 21mm to the left, as the position in the diagram as the center. In the case of the drawing [ZLFG40] below, the stroke is ±5mm (10mm), and the dimension indicating the stage height (41) means it changes between 36mm (-5mm) and 46mm (+5mm). 21mm 21mm [XWG60] [ZLFG40] 15.2 Ø13 22.5 2.5 (41) 16 16 40 40 32 17.5 16 16 8-M3, Depth 4 Clamp Feed Knob 4-Ø3.5 Through, Ø6 Counterbore (M3 Screw Hole) 6 6 32 For Stroke ±5 The dim. (41) will change 36~46. Positioning Stages Technical Information
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