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The time-dependent mechanical properties of fibre reinforced polymers
No full textProgress Report No. 1:
A report of work carried out during the
period lst October, 1967 to 31st March, 196
Automatic assembly design project 1968/69: report of the control and motivation committee
No full textMethods of control for automatic assembly machines are
surveyed. The control requirements of the versatile
automatic assembly machine are analysed, and the most
practical system is specified and designed in detail
An investigation into the basic mechanics of orthogonal machining
No full textThree machines were modified to enable orthogonal cuts to be taken
over a speed range of 0.04 in per min to 50 ft per min. The very low
speed films were used to verify an analytical solution to the cutting
operation at the tool point. Over the whole range the results showed
some agreement with other research results
Design project 1968/9: report of assembly process committee
No full textThis report describes the approach to the
design of an automatic versatile assembly
machine of modular construction. Details
of the design of the conveyor module, the
platen upon which the assembly is mounted and
the platen motivation mechanisms are included.
It also includes the assembly system that has
been applied to the assembly of an electrical
contact block. This entailed a machine
layout, the re-design of a component and the
design and specification of appropriate fixing
heads
Resistance network simulation of semiconductor systems
No full text1. Introduction
A basic problem in the design theory of semiconductor systems
such as p-n junction devices relates to the determination of the spatial
variation of electrostatic potential, 4, of electric field intensity,
and of mobile carrier (hole, electron) concentrations, p and n ... [cont.]
An appraisal of a systems procedure with particular reference to a tyre manufacturing organisation: 2nd year ergonomics course
No full textThe objective of this project was to show how the procedures
and techniques of system design may be used to evolve a soft
system.
In this project a systems design procedure was applied to a
tyre ordering and despatch method for a large manufacturing
organisation
Note: estimating the charge size in explosive forming of sheet metal
No full textNote: Estimating the charge size in explosive forming of sheet metal
In the explosive forming of sheet metal some relatively easy method
of estimating the size of the charge is needed. This short note describes
a method in which the size of the charge is found by equating the work done
in forming the component to that part of the explosive energy available
for doing work on the component … [cont]
Large scale metrology
No full textINTRODUCTION
It has been recognised in industry that the measurement of large
components to high orders of accuracy presents a particularly difficult
problem. This fact has been emphasised by a survey carried out by the
N.P.L. (Ref. 1) in which a number of engineering firms in Great Britain
were asked to declare the size of several prepared test pieces ranging in
diameter from 15 inches to 80 inches.
In general terms the result of this investigation showed that, under
industrial conditions using conventional equipment, it was not possible
V declare the size of large components to an accuracy of better than
- 30 parts in a million under workshop conditions and - 15 parts in a
million under inspection conditions. The survey also showed that above
20 inches the accuracy of determination of internal diameters was somewhat
higher than for external diameters.
The purpose of this paper is to indicate the main problems associated
with measuring large sizes and to describe the experimental work undertaken
at the College of Aeronautics in the design and testing of a new type of
stick micrometer for internal diameters and micrometer frame for external
diameters
Research project 1 of the metal spraying and coating Division of the Institute of Welding: progress report no. 1
No full textIntroduction
The quality of a sprayed metal deposit is known to be related to
the nature of the prepared surface of the base metal. Grit blasting is
a common method of surface preparation, and the actual profile or surface
contour of the prepared surface can be varied considerably by variation
in blasting conditions. The exact requirements of an acceptable surface
have never been accurately stated, although a degree of undercut is.
considered essential.
The object of the present work is to develop a non-destructive
method for the assessment of blasted mild steel surfaces in terms of
suitability for metal spraying. Such a method needs to combine simplicity
and speed, so that it can be used by normal inspection personnel without
delaying production. Preferably the method should incorporate a 'failsafe!
mechanism..
A number of possible assessment methods have been considered, but
attention has been largely concentrated on measurement of the diffuse
reflectivity of blasted surfaces. In reality, of course, this is simply
an attempt to replace the eye in visual inspection with an instrument,
and so remove the human element. Results have been reasonably encouraging,
but it is obvious that many more samples need to be examined before a true
judgement can be made.
Some difficulty has been encountered in deciding the requirements for
an acceptable surface. For this reason, a part of the experimental effort
has been devoted to the examination of blasted surfaces, and to the measurement
of bond strength after metal spraying.
A brief review of literature has also been included
Avoidable delays among women workers on light work
No full textSUMMARY
Time Study makes use of certain allowances in correcting
observed times to standard times. One allowance, the 'fatigue'
allowance of F.W. Taylor, allocates a certain period of the working
day to rest on a basis of conditions of work. The allowance is
now termed Compensating Rest (C.R.) Allowance and is given for a
variety of psycho-physiological conditions of work. A study of
women workers in light industry is reported which measures the time
spent not working, in talking etc. From this study causal factors
effecting time not working are considered and certain recommendations
are made as to values for C.R. Allowances covering certain factors in
the work situation.
The method of study employed was that of ratio delay originated.
by L.H.C. Tippett and some comment is made on its application