LINEAR MOTION SOLUTIONS - Brd. Klee A/S

Critical Speed Chart
Simplicity ® Linear Slides
CRITICAL SPEED: The maximum speed at which a ball screw or ball
nut can rotate without producing destructive resonant vibrations. The
critical speed is a function of the ball screw diameter, the unsupported
length of screw, rigidity of bearing supports, and RPM.
How To Use Chart:
1. Determine end fixity. How many ends are fixed? (Slide designation,
2RPS & 2LRPS)
2. Determine slide length. (“L” dimension)
3. Find the length – fixity vertical line, read up to find the intersecting,
at the required travel rate.
4. Select a slide above or to the right of the intersection point.
5. Higher speeds and/or longer lengths are available as cost effective
specials, having a larger ball screw and bearings. (Consult
manufactuer.)
Travel Rate (N)
(inches/sec.)
Lube Req’d
Lube Optional
150
100
50
30
20
10
5
2
1
.5
6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120
1
8
3 4 5 6 7
2
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200
L
L
Load Axis
length table
series page #
1RPS 166-167
1LRPS 170
Load Axis
CURVE #
1
2
3
4
5
6
7
8
2RPS-08-(AR or AL)
2LPS-08-(AR or AL)
2RPS-10-(AR or AL)
2LPS-10-(AR or AL)
D = .500
H = .200
2RPS-16-(BR or BL)
2LPS-16-(BR or BL)
D = .840
H = .250
2RPS-24-(BR or BL)
2LPS-24-(BR or BL)
D = 1.375
H = .250
2RPS-16-(CR)
2LPS-16-(CR)
D = .870
H = .500
2RPS-24-(CR)
2LPS-24-(CR)
D = 1.260
H = .500
2RPS-16-(DR)
2LPS-16-(DR)
D = .840
H = 1.000
2RPS-24-(DR or DL)
2LPS-24-(DR or DL)
D = 1.140
H = 1.000
2RPS-24-(ER)
2LPS-24-(ER)
D = 1.190
H = 1.875
Critical Speed Formulas*:
DH
7.93 x 10 4
SLICE SERIES SIZE, LEAD
2RPS-12-(AR or AL)
2LPS-12-(AR or AL)
2RPS-20-(BR or BL)
2LPS-20-(BR or BL)
2RPS-32-(BR or BL)
2LPS-32-(BR or BL)
2RPS-20-(CR)
2LPS-20-(CR)
2RPS-32-(CR)
2LPS-32-(CR)
2RPS-20-(DR)
2LPS-20-(DR)
2RPS-32-(DR or DL)
2LPS-32-(DR or DL)
2RPS-32-(ER)
2LPS-32-(ER)
N = Critical speed (Maximum) (expressed in inches/sec.)
D = Root diameter of screw (in.rev.) (See chart)
H = Lead of screw (in.) (See chart)
L = Slide length (in.)
C s = End fixity factor
C s = 0.36 for 1RPS & 1LRPS
C s = 1.47 for 2RPS & 2LRPS
Critical Speed Chart
length table
series page #
2RPS 168-169
2LRPS 172-173
*NOTE: Chart figures at 80% of actual load.
Do not exceed these figures.
800.962.8979 • www.pbclinear.com 183