Ball screw lead, Speed – Adept Python User Manual
Page 42
Chapter 3 - Python Linear Module Descriptions
42
Adept Python Modules User’s Guide, Rev. E
Ball Screw Lead
The available ball screw lead options are 5, 10, and 20 mm per revolution. Repeatability,
thrust, payload, speed, resolution, and other specifications vary by the selected lead
option.
All Python modules up to 1600 mm in stroke length employ precision ground ball screws
manufactured by Kuroda corporation. 15 mm diameter screws are used in all modules up
to and including lengths of 1000 mm. Modules over 1000 mm use 20 mm diameter screws.
1800 and 2000 mm L18 modules use 20 mm diameter rolled ball screws, which have
reduced lead accuracy.
Speed
The maximum speeds of Python linear modules are determined by ball bearing
recirculation limits established by the ball screw manufacturer up to certain lengths, then
decrease due to ball screw shaft rotation dynamics. Therefore, the maximum speed
settings are constant up to 800 mm stroke lengths but are reduced as lengths increase.
1800 and 2000 mm modules are only available in side- and bottom-mount configurations.
40 mm lead ball screws are coupled with 2:1 timing belt ratios for a net lead of 20 mm. L18
modules with 10 mm net ball screw leads are available as customs in lengths of 1400 to
2000 mm. The following table lists the SPEED 100 speeds for each module stroke length.
Table 3-7. Linear module SPEED 100 speed [mm/s]
a
Lead Pitch (mm/rev)
Length
[mm]
5
10
20
100
330
660
1330
200
330
660
1330
300
330
660
1330
400
330
660
1330
500
330
660
1330
600
330
660
1330
800
330
660
1330
1000
n/a
440
880
1200
n/a
320
635
1400
n/a
n/a
635
1500
n/a
n/a
590
1600
n/a
n/a
515
1800
n/a
n/a
500
2000
n/a
n/a
500
a. Adept users are able to command speeds up to
SPEED 110, so the effective maximum speeds are
10% higher than those listed above.