Catalogue Setco - Precision Dovetail Slides
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L
Design Data
Force and Torque Requirements
Definitions
Force and Torque Requirements
The torque required to power the slide consists of the torque needed to overcome friction, all external loading and miscellaneous factors.
Note: Below torque calculation does not take into
consideration acceleration/deceleration requirements. Consult factory for these applications.
e
lenuy
e1 of ballnut is typically 90%
e2 of gearbox, industrial pulleys, etc., is typically 95%
G.R. L
TBI TB2
T
Tm
= Ratio of motor speed to ballscrew speed
= Lead movement of slide in inches per revolution of ballscrew (inch)
= Torque at ballscrew (in-lb)
= Torque at Acme screw (in-lb)
= Thrust force applied by slide/load on a workpiece (lb)
= Miscellaneous torque
oR /
1
1
-SLIDE SADDLE
LOAD
0 s 0 0 0
PULLEYS, " GEARBOX, ETC.
tin-
Tmotor = Load torque required at motor (in-lb)
U = Coefficient of friction (See page 50)
Note: Use m = 1.0 for all vertical applications.
W = Weight of the saddle and load (lb)
D = Diameter of Acme feedscrew
(1) Friction torque generated by weight of the slide.
(2) Torque required for thrust loading.
(3) Friction torque generated by the thrust load (approximation).
(4) Torque required to overcome seals, gib adjustments, etc. (10% of TB or 10 in-lb minimum.)
Tor
que Calcu
Tmotor =
lations:
TBI
TB2 G.R. x e2
or
G.R.x e2
Ballscrew Formula
TB1= W x /7 x L + Tx L + T x // x L + Tm 6.28 x e1 6.28 x e1 6.28 x e1
(1)
Acme Screw Formula
(2)
(3)
(4)
TB2=
[ W x //x D + Tx D ]
[ Lx 1.29 x D 3.14 x D - 0.4 x L
+ Tm
st Capacities
The
chart at
maximum thrust capacity for the various feedscrew and ballscre
le lengths,
w drive thrust
packages available i
package being
drive
r
considered must be compared to the load capacity (Mz) of the slide. (See page 50.)
MODEL
TYPE OF SCREW
FS (lb.)
FSI (lb.)
FGM (lb.)
STATIC
DYNAMIC
STATIC
DYNAMIC
STATIC
DYNAMIC
M0
1630
1010
N/A
N/A
N/A
N/A
M1
1920
1190
N/A
N/A
N/A
N/A
M2
1920
1190
N/A
N/A
N/A
N/A
M3
3190
1690
N/A
N/A
N/A
N/A
M4 DS4
3830
1880
N/A
N/A
N/A
N/A
N/A
N/A
1920
1190
N/A
N/A
DS6
N/A
N/A
1920
1190
12,000
1550
DS8
N/A
N/A
3830
1880
12,000
1550
DS10
N/A
N/A
3830
1880
12,000
1360
DS12
N/A
N/A
3830
1880
12,000
1360
DS16
N/A
N/A
8140
3080
37,000
4700
Notes: 1. The values shown in the chart are based on the mechanical thrust limitations of the drive package.
2. For extremely long travel applications, consult factory for limitations due to column loading.
3. For static applications, consult factory for limitations due to saddle locking device and/or back-driving force.
49
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