WHAT THEY SAY:
A selection of extracts
and complete letters received from customers expressing satisfaction with the
Bridgeport Machine Tools Ltd
(VCM90) is truly a remarkable piece of equipment – invaluable.’ (Castings and Fabrications)
Dean, Smith & Grace,
Monarch Group. - Precision Machine Tools.
eliminated any stability problems….including critical items such as headstocks,
carriages, slides etc.’
‘Dramatic effect…after six months using VSR we
were able to abandon the thermal stress relieving of all castings which saved
approximately £30,000 per year’
Hewson & Turrell Ltd. - Manufacture and repair of
VSR to our refurbishment procedure has been a very cost affective success and
increased customer satisfaction.’
Metal Box Eng.Ltd. - Can manufacturing
willingness to do this at any time and the efficient way you carry out the
work, helps us to achieve our deliveries.’
Zed Instruments Ltd. - Laser Engraving machines.
unit was used to conduct frequency response tests in the range 0-200Hz on our
first few machine bases and from the information gained, stiffer and more cost
effective bases evolved.’
precludes the problems generally associated with thermal stress relief such as
wasted time, transport costs, furnace capacity and cost, scaling and warpage.’
Hunt Moscrop Ltd. ( Voith
Sulzer Papertech ) - Paper and printing machinery.
fabrications requiring absolute stability…We are well pleased’
Simon-Pamac Ltd. - Paper making machinery.
and effective on critical components…no transport cost…no delays.’
Bombardier/Short Bros. - Aerojigs and fixtures.
for 6 years on internal tooling - cheaper than TSR and is done within the
Helio Mirror ( USH Group ) - Military equipment.
problems in 8 years of usage, aids workflow - used on EN and armoured steels.’
Kratos Analytical Instruments.
using Thermal Stress Relieving - continued distortion after final machining.
Vibro Stress Relieving prevents this distortion.’
ESA box in M.S. CLA1A material (a 680 x 300 x 200 investment casting ) for a
mass spectrometer. Supreme accuracy and stability required.’
Pegsons Ltd. Mining and quarrying
and cheaper ( than Thermal Stress Relieving )’
Cameron Iron Group.
a number of years our company has been using, with great success, the
facilities offered by Vibratory Stress Relieving. The Majority of work has been
carried out on large fabrications and has been very effective compared to the
traditional methods of stress relieving. We would recommend your services and
effectiveness of stress relieving on any type of mild steel.’
Dansk Teknologisk Institut
-Taaststrup ( D ).
find the results very promising giving in general a clear indication that
vibratory stress relief does affect the dimensional stability in connection to
Deloro Stellite Ltd. M/S /Stellite Blades.
many Years we suffered with problems of stability because the knife had to be
ground to extremely high standards of straightness and flatness. Despite
repeated thermal stress relief, stability was always a problem and it was not
until a few years ago, when we were introduced vibratory stress relieving, that
the problem was finally solved in a completely satisfactory manner.’
Fairey Eng. Ltd. - General Engineers.
a somewhat sceptical approach to VSR, confidence in this technique increased
with each subsequent application.’
Vickerys Ltd. - Papermaking Machinery.
long fabrications appear to be 5-8% more rigid compared to previously heat
treated fabrications…. Typical fabrications 6m x 300 x 300 MS/SS .’
BAe Hawker Siddeley Ltd., - Aero jigs and fixtures.
large amount of work as been undertaken on fabricated jigs (made from
commercial steels)….We have been very satisfied with the results and have
dimensionally stabilised the jigs such that no complaints have been received.’
W.D.S Standard Parts - Precision Engineering
results of eight tests conducted proved the reliability of claims that VSR
achieves at least the same if not better results than the furnace method and
the product stays clean. The advantage of VSR over the furnace method is that
it is in-house, cheaper to run, can be 'instantaneous' in use and can be used
for 'one-offs' or batches.
equipment is deemed essential in order for us to supply stable steel and cast
iron section products of guaranteed quality to our customers.’
Inca Geometric - Machine Tools.
becoming users, we have had no cause yet to use any form of TSR…parts from a
few pounds weight to fabrications up to 10 tons approx.’
Rover Group - Jigs & Fixtures.
have currently been using your equipment for 17 years on welded fabrications
and large base plates, we find the benefits of carrying out this work in-house
an efficient, time saving and cost cutting process.’
Langley Alloys - Manufacturers of SS bar. ‘We
are engaged in the manufacture and processing of exotic corrosion resistant
alloys (copper based and duplex stainless steel). For over 10 years, where our
designs specify the needs for such treatment, we have informed our suppliers of
bar and forgings that vibratory is an acceptable alternative to thermal heat
treatment and indeed the preferred method for duplex stainless steel
P K Engineering Ltd. ‘As
a precision sub-contract machine shop we are involved in the manufacture of a
diverse range of complex components for instrument and food companies. During
the past two years there are two projects in particular which proved to be very
demanding in engineering terms where we have utilised VSR with complete
success. The machining tolerances on this component are very demanding and it
is essential we have a very stable fabrication (stainless steel) during and after
machining. Although the tank geometry is unbalanced and thin wall sections are
used to minimise weight there is no movement at all during or after the machine
process and our customer has expressed complete satisfaction.
We have also used VSR on
rotary valves for food dispensing and as these have straight bores up to 500
m/m long with radial clearances
between rotor and valve body of 10 microns
stability is critical during and after boring and honing to ensure a smooth
running valve. Our
customer is delighted with the product and we
as a result have secured more contracts from them. We now specify VSR as the
preferred method wherever possible.’
Magco Screens., (Babcock
use of Vibratory Stress Relieving does, contribute to the quality of manufacture
in two ways. Firstly when manufacturers are aware that fabrications are being
subjected to this process, more care is taken over the preparation and welding
of these items, and secondly, the process of Vibratory Stress Relieving seeks
out and finds any suspect welds or joints.
using the process which we introduced some years ago, to the best of my
knowledge, we have no premature failure of vibrating screen supports.’
Weir Engineering Services.
in Aberdeen use VSR to stress relieve shafts which when straightened by John
McNabbs will not remain stable during assembly.’
usual procedure is to return the shafts for a second attempt at straightening
before the decision is made to use VSR.’
process that can salvage new components and reduce the companies re-work (Acro
costs) should be fully investigated to evaluate its potential.’
Svedala UK Ltd.
have used VSR equipment for over ten years on screens and associated components
to our complete satisfaction. We have treated Trellex & Skega components in
the past and intend to continue using the process on Svedala equipment.’
Albany International Ltd. Paper making machinery. ‘A
very important part of our production programme for our paper industry
Adamson Butterley Ltd. Cranes.
our large fabrications which require machining have been treated successfully
by this method…..your in-plant service suited our requirements admirably.’
Westinghouse Ltd. Pumps/compressors.
satisfied….beneficial in the treatment of AL25 cast pump and compressor bodies.
Before the treatment was carried out, castings proved very unstable and
impossible to maintain close limit machining.’
Courtaulds. Textile machinery.
years experience, with the latest use being by our subcontract suppliers.’
problems encountered using VSR.’
danger of incorrect thermal treatment of 304 and 316 Austenitic Stainless Steel
fabrications, hence avoids associated reduction in corrosion resistance.’
Francis Shaw Co Ltd. Rubber & Plastics Machinery.
service - a truly amazing piece of equipment – no problems encountered over
eighteen years of unbroken service.’
Powell Manufacturing Ltd. Machine Tools.
does not leave our works, minimises machining down time – good, reliable