Page 137 - Parker - Daedal manually driven positioning slides and stages

Rotary Positioners Product Specifications

Main Bearing Load Capacity Maximum Output Torque
Normal Load Load The maximum torque which the rotary stage can produce at the
This is the load or force which can be applied carriage without damage or excess wear to the mechanisms.
in a downward direction (Compression) Concentricity
on the rotary stage top. The center of Perfect Circle
force or C.G. of the load must be in the The maximum variance between
center of the mounting surface. a perfect circle and the path
For loads which are offset from which the rotary stage
the center, refer to moment loads. Load follows. Concentricity is B
measured by placing a
Inverted Load circular gauge disk on the Actual
Same as Normal load capacity table top and aligning it with Travel
Path
except in an upward or tension the circular path of travel.
A
direction. An indicator is then placed on Concentricity = A - B
C.G.
the gauge disk and the variance is
Moment Load measured as the concentricity error.
This specifies the maximum overhung Axial Runout Runout C L
load or force which can be applied to
the rotary stage without damaging Measured at the center of rotation,
the mechanism. (See Calculating 2.00 axial runout is the amount of vertical
Moment Loads, below.) motion the rotary stage moves as it rotates.

Calculating Maximum Allowable Moment Example: Rotary Stage Moment Load
Loads on Rotary Positioners A load of 12 pounds is C.G.

To determine if a load or force is within acceptable mounted to a 30008 rotary
moment load ranges follow the steps below: table. The illustration shows
the position of the load in
1. Calculate maximum load or force which will be applied reference to the center of
to the Rotary stage. Include brackets, and other axes rotation on the rotary table.
which are mounted to the rotary stage. The load is offset 6 inches 6
from the rotation center.
2. Locate the center of force or C.G. of the load. (The 30008 moment load
3. Measure the distance from the center of force or C.G. curve is shown below for this example.)
to the center of the rotary stage. This is the moment First find 12 pounds on the X axis and draw a vertical
arm and is designated A. line parallel to the Y axis, next locate the moment arm
4. Locate the moment load graph for the rotary stage distance on the Y axis. Draw a horizontal line from
you are interested in (located in back of individual this point until it intersects with the vertical line. The
product section). The X axis of the graph is the Force, intersection point is below the moment curve, thus the
the Y axis is the allowable moment arm A. 30008 table is acceptable for this application.
A
5. Locate your load force on the X axis of the graph. (moment arm)
6. Draw a vertical line from the Force location on the X cm in 30008
axis parallel with the Y axis. 25,40 10.00
22,86 9.00
7. Find the Moment Arm distance on the Y axis. Draw a 20,32 8.00
horizontal line from this point parallel with the X axis 17,78 7.00
until the vertical and horizontal lines intersect. 15,24 6.00
5.00
12,70
8. If the intersection point is below the moment curve 10,16 4.00
then the stage is within acceptable limits. If the 7,62 3.00
intersection point is above the moment curve a 5,08 2.00
1.00
2,54
positioner with a larger normal load capacity should 0 0 Engineering Reference
Load
be selected and the above steps repeated. 10 15 20 25 30 35 40 45 50 55 60 65 70 75 (lbs) (force)
89 111 134 156 178 200 223 245 267 289 312 334
(N)
46
67
Parker Hannifin Corporation www.parkermotion.com
Electromechanical Automation Division
Irwin, Pennsylvania 135