Simplicity ® Linear Slides Critical Speed Chart
Critical Speed
Curve #
Slide Series
Lead
D (in.)
H (in.)
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 the screw, rigidity of the bearing supports, and RPM. How To Use Chart: 1.Determine end fixity. How many ends are fixed? (Slide designation, 2RPS and 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
1 & 2RPS-08
2LRPS-08
AAxx
.500
.200
1 & 2RPS-10
2LRPS-10
1 & 2RPS-12
2LRPS-12
1 & 2RPS-16
2LRPS-16
ABxx
.840
.250
1 & 2RPS-20
2LRPS-20
1 & 2RPS-24
2LRPS-24
ABxx
1.375
.250
1 & 2RPS-32
2LRPS-32
1 & 2RPS-16
2LRPS-16
ACxx
.870
.500
1 & 2RPS-20
2LRPS-20
1 & 2RPS-24
2LRPS-24
ACxx
1.260
.500
Critical Speed Formulas:
1 & 2RPS-32
2LRPS-32
L 2 DH
N = C s
7.93 x 10 4
1 & 2RPS-16
2LRPS-16
ADxx
.840
1.000
1 & 2RPS-20
2LRPS-20
N = Critical speed (MAX) (expressed in in./sec.) D = Root diameter of screw (See chart) H = Lead of screw (in.) (See chart)
1 & 2RPS-24
2LRPS-24
ADxx
1.140
1.000
1 & 2RPS-32
2LRPS-32
L = Slide length (in.) C S = End fixity factor C S = 0.36 for 1RPS C S = 1.47 for 2RPS and 2LRPS Note: Chart figures at 80% of actual load. Do not exceed these figures.
1RPS Slide Length (L) in Inches
6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120
150
100
1RPS
50
L
30
20
Load Axis
10
5
7
2RPS & 2LRPS
5 6
3 4
L
2
2
1
1
Load Axis
.5
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200
2RPS & 2LRPS Slide Length (L) in Inches
136 Round Shaft Technology • pbclinear.com
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