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Spark
Eroding. Co. UK
Mobile Spark Erosion Services
by
Pear Tree Engineering
1, Thirlmere Road,
Golborne,
Warrington, Lancs.,
WA3-3HH
Tel..01942-715528 (please
try first)
Mobile 07704-148667
( please do not leave messages on mobile, but call again if
no answer)
On Site Spark erosion or Spark
eroding or electro metal disintegration for the removing of broken
bolts, studs, drills,
taps or extractors.
The removal of broken drills, taps, extractors, bolts
etc., is achieved by creating an electric spark between the broken
item and the electrode which is held in a vibrating head. The spark at
the tip of the electrode and the item to be removed reaches almost 5000
degrees Centigrade. Flooding with coolant creates a thermal shock,
reducing the heated material of the broken item to powder and washing it
away. No discernable heating of the parent material occurs, and there is
no distortion of the parent metal when removing the broken drill, tap or
extractor.
Spark erosion
can be carried out in house, or at your site, anywhere, subject to call
out charge, and is perfect for removing broken taps, broken drills and
broken extractors, as well as broken bolts and studs.
By prior
arrangement, we can also work on small transportable items,
either sent by carrier or your own transport
The
Disintegrator Process
A clean cut with no damage
to the work piece

Because the high temperature arc between the electrode and
the work piece is continuously quenched by coolant, there is no
softening of material around the hole. The hole created by the
arc takes the same shape as the electrode used.
BENEFITS to you:
• Reclaim expensive parts quickly, easily.
• No re-manufacturing of parts.
• Flexible working hours.
• Quick response.
• Eliminate production overruns and late deliveries.
• Scrap reclamation.
The spark eroding process has burnt out the
centre of a broken tap leaving only the flutes to be
removed, not damaging the parent metal. It also removes the
centre only of a broken drill, but may do some damage to the
threads of a broken bolt or stud, which then would need to be
reclaimed by the insertion of a wire insert.
Using our portable spark eroder machines
We have removed:-
1. a 35mm piece of a 30mm drill from a hole some 300mm down a 30mm drilled hole
in a 17 tonne casting bound for China,
2. a 5mm broken stud from an electrical component.
3. We have also removed a broken diesel heater plug from a Mercedes diesel
cylinder head, 2 broken wheel bolts from another Mercedes,
4. an extractor 40mm in diameter from a broken cylinder head bolt in Isle of Man
Steam Packet MV
Lady of Man.
5. A seized 100.oo m.m. bolt from a new concrete destruction testing
machine in Watford, London.
6. Broken lathe centres from both Corus Darlington and Corus Redcar
3 separate visits.
7. A broken stud in a Beechcraft aircraft engine at R.A.F. Cranwell in Lincs.
8. 200mm of a broken 60mm drill /
boring bar in Sheffield
9. 2 broken taps in a Warrior tank for BAE Systems
Barrow in Furness
10. A broken bolt for Alcoa Birmingham from a machine that makes aluminium sheet
for the Airbus
11. Broken taps for Thyssen Krupp in components for the Euro Fighter.
12. Broken head bolts on the engine of an Dutch ex minesweeper, now used for the
Dutch "sea scouts" at Hull
13. A broken drill in a naval 4.5" gun for BAE
Systems Barrow in Furness
14. Corroded studs and a broken tap on the boiler of the
Lydia Eva, the last of the drift trawlers of the Lowestoft fleet
being restored at Small & Co
marine Engineers of Lowestoft.
15. A broken head bolt in a 20 cylinder engine powering an electricity
generator at 2 sites for Clarke
Energy.
More recently
16. Have removed a broken cylinder head bolt
from a trawler engine in Peterhead,
Aberdeenshire, Scotland.
17. A broken 60mm bolt in a machine for
Alcoa Birmingham (see 8) third separate visit
18. A broken drill in a barrel for the
AS90
mobile gun for BAE Systems Barrow in
Furness third separate visit
19. Have burned 4 precise holes in casing of a
Rolls Royce Spey Jet Engine. belonging to the M.O.D. on
behalf of
Qinetiq at
Shoeburyness.
Equipment used
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Portable control unit 2S
36" x 20" x 22"
Approx weight 3.5cwt |
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Mounting system
Base 13" x 7"
Min room rqd 24" x 12"
Height 39"
Min distance for electrode to edge of base 4" |
Mini Mag Base
Base 9" x 4"
Total Height 14"
Min width rqd 20"
Min depth Rqd 11"
Min distance for electrode to edge
of base 4" |

Large fixture mounted on a 4Ft diameter chuck to remove broken morse
tapered centre, using 20kva machine Click on picture to enlarge
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Under the new REACH requirements, the only
dielectric used is water.
We only
work on the strict understanding that terms and conditions are understood and
agreed.

Member Federation Self Employed and Small Businesses since 1985
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