- Project Runeberg -  Sfären : tidning för SKF-folk / Fjärde årg. 1924 /
20

(1923-1924)
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daughter Companies and agencies throughout the world,
who prefer to make use of the technical experience of the
drawing office.

An intimate collaboration between the Publicity
Department and the drawing office is, of course, maintained
in so far as that all technical information is submitted or
examined by the drawing office before being sent out by
the Publicity Department as propaganda.

The SKF Technical Department
at Luton

As the sister company in Luton — the Skefko Ball
Bearing Co., Ltd. — is a manufacturing as well as a
selling concern, their Technical Department is one of the
more comprehensive ones.

The collaboration between the technical and the
mercantile departments is carried on in much the same way
as in Gothenburg.

The Technical Department deals with enquiries for
which drawings and other necessary data have to be
made up and prices calculated.

Cases of a more complicated nature are forwarded to
Gothenburg with data required for preparing a design of
the application.

The members of the engineering staff have specialized
in automobile, colliery, textile and other work.

There are sections for tracing and blueprinting, and a
laboratory for mechanical tests of the works’ products.

The Technical Department at SKF, Paris

This department was opened in 1919.

It is organized in the same manner as the drawing office
in Gothenburg, and also includes the publicity and return
departments.

The greater portion of the purely technical work
consists of preparing drawings for applications and replying
to technical letters.

The engineers when travelling usually visit the drawing
offices of the customers and then have a good
opportunity of discussing bearing problems with several engineers
at the same time.

Much time is occupied by visits from the customers, as
detailed information always must be given. In most cases
an order follows for the bearings proposed.

As a point of interest it may be mentioned that an
application of ball bearings to molecular air pumps has been
carried out, the construction of which was possible solely
because of the precision of our bearings. The air gap
between the fixed and moving part is only 0,03 mm.

With regard to propaganda work this is confined to
advertising in the principal technical periodicals, the
printing of new catalogues and arranging small exhibits in the
frequent French fairs.

The Technical Departments of SKF*Norma,
Berlin

The object of this article is to give a brief outline of
the work carried on in these offices. All designing work
is done in the drawing office, under the supervision of the
chief engineer.

In collaboration with the drawing office separate
departments dealing with various application problems have

been organised, so that a more intensive specialization is
possible, based as it is on data and information received
from various industries. It is thus possible for the
different departments to negotiate with customers from various
industries, and to follow the work until an order is received.

Statistics are compiled concerning experience gained in
various industries, and this is facilitated by the person
responsible for this work following up the correspondence
and reports from the travelling engineers regarding repairs
and demolitions, etc.

Great importance is attached to the necessity of a good
technical training of the staff dealing with customers.
The travelling engineers are called home from time to
time to serve in the drawing office, and they are thus in
contact with what is going on and can also report as to
experience gathered from customers.

Designing Work

Mr Törnebohm first describes in his article the class
and extent of the work done in the SKF machine drawing
office, and thereupon gives a description of the different
stages to be passed before the work is complete. This is
illustrated by an example showing the designing of a
radius-template grinding machine now being built and
intended to be used for grinding radii from one to ten
metres, the templates being used in the manufacture of
certain roller bearing tools. The author points out the
problems to be solved before the drawing work proper can be
commenced, and the progress of the work is also described.
In conclusion he touches upon designing and invention work.

Points to be considered in Designing Ball
Bearing Applications

The author of this article deals with the factors and
problems met with when a ball bearing application is to
be prepared. These factors are of various kinds, as, for
instance, loads and speeds, the space available, the risk
of abrasive bodies entering the bearings, temperature
conditions, the life required of the machine, and so forth.

In a large number of cases the load and its variations
in relation to magnitude and direction are undoubtedly
the most important factors. A good knowledge of the
load or load combinations in each case will be a great
aid in the choice of the proper bearing.

The speed of the bearing and its individual movements
will also be determining factors in the selection of a
suitable size and type of bearing. If the speed is not constant,
it is necessary to ascertain its variations. In some cases
this can be done, but great difficulty is frequently
encountered in this respect. It is not, of course, possible to
determine exactly every variation of load and speed, but
for a certain class of machines a characteristic variation
of load and of speed can be counted on. The author goes
on to show how this can be done in, a connecting rod, for
instance.

What in many cases makes the designing of a proper
application so difficult is that the data are incomplete,
and even if at first these appear sufficient, in most cases
nothing is mentioned as to the life required or the
conditions under which the bearings are to operate.

The author leans towards the opinion that the
preparation of an application giving complete satisfaction will
always be very difficult, and the probability of obtaining
a good result simply by building on assumptions is very
small.

’fezata.
WALD. ZACHRISSONS BOKTRYCKERI
GÖTEBORG 1924

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