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Technical data are subject to change without notice.
ISO 9001 certified. © Copyright SPM 1996-9. 71411.B
SPM Instrument AB • Box 4 • S-645 21 Strängnäs • Sweden
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Fig. 3
Obtaining the Basic Bearing Data
To obtain the basic bearing data for a new measuring
point, you have to work with the bearing catalogue,
the TYPE No. table in figure 5, and the A2010. You
also have to know the rpm of the shaft.
Assume that the rpm is 360 and that you want to
obtain NORM and TYPE Nos. for a spherical roller
bearing with SKF catalogue number 23168CC/W33.
TYPE No.: Compare the bearing's designation and
its profile in the bearing catalogue with the TYPE No.
table. Spherical roller bearings have TYPE No. 7.
Mean diameter Dm: From the bearing catalogue you
can obtain the bearing's shaft diameter d and its
outer diameter D. Add the figures and divide by 2 to
obtain the mean diameter Dm. For bearing 23168CC/
W33, the figures are d = 340 and D = 580, giving
Dm = 460.
ISO number: If the manufacturer uses catalogue num-
bers which follow ISO standard, the size of all bear-
ings with TYPE Nos. 1 through 8 is coded in the last
three digits of the ISO number. For bearing 23168CC/
W33, the ISO part of the catalogue number is 23168.
NORM No. from ISO Number, rpm
For bearings with TYPE No. 1 through 8, the A2010
can calculate the NORM No. and the mean diameter
using the ISO bearing number. Press the SET key and
set the TYPE No. and the accumulation, as described
on the previous page. Press SET again to get the
menu shown in figure 4A. If you have used this menu
previously, the last values set will be shown instead
of dashes. Set ISO x x to 168 as follows:
• Press the UP key to set the digit in cursor
position to 1.
• Press UP+DOWN (both keys simultaneously),
then UP until the last two digits read 68. Press
SET to get to the rpm line. The Dm line will now
read 460.
• Press UP+DOWN twice to hop over the first and
second position on the rpm line. Press UP until
the line reads 300.
• Go to the next position with UP+DOWN, change
the number to 360 with UP. Press SET twice. This
will first bring you to the Dm line, and then
change the NORM No. to 44. Finish with the M
key.
A Menu for NORM No. calculation
NORM No. from rpm and Dm
If you have no ISO number, hop over the ISO line with
SET. Input the rpm, using UP or DOWN to change the
figures, UP+DOWN to go to the next position. Input
the mean diameter Dm, press SET to obtain the NORM
No. 44. Finish with the M key.
The figures on the ISO line will change to dashes (- - -)
when the Dm line is changed.
The maximum rpm is 19 999. The maximum mean
diameter is 1 999. The highest NORM No. is 58, the
lowest is 10 (below 10 the LR/HR readings are not
evaluated). NORM No. 0 is set for unnormalized read-
ings.
B Menu after input
Fig. 4
BEARING DATA
NORM 44 ISO x x 168
360 rpm
Dm 460 mm
BEARING DATA
NORM 0 ISO x x - - -
----- rpm
Dm ---- mm
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