Starrett Core
Ejector addresses
an age old
problem
F
ollowing comprehensive
product testing and
evaluation at its facility in
Jedburgh, the L.S. Starrett
Company is launching a cost-effective
and simple solution to an age old
problem. The company’s new Core
Ejector for bi-metal hole saw s has been
designed and developed to effectively
remove the slug of material that usually
ends up inside the cup of the hole
saw once it passes through the sheet
material being cut.
Comprising of a precision tapered
spring and an aluminium pressure plate
the Core Ejector has been created to
improve productivity and efficiency,
as well as operator health and safety.
As Marketing Manager, John Cove,
explains: “Safely removing the annular
disc of sheet material that often
becomes jammed inside the hole during
normal operating conditions is an age
old problem that many customers have
faced. Usually the operator will stop the
saw, remove the entrapped material by
sliding a drift or even a screwdriver in to
the slots in the side of the hole saw. As
well as the lost time required to perform
this task there is an obvious danger to
the operator as the teeth of the saw
are naturally sharp and will be at an
elevated temperature.”
The Core Ejector addresses these
problems in a simple and reliable
way. As the saw cuts into the sheet
material, the aluminium pressure plate
compresses the spring inside the cup of
the saw. When the saw breaks through
the spring will act on the pressure plate
as it returns to its natural open state,
effectively ejecting the disc of raw
material before it becomes trapped.
90
PECM ssue 15
Fitting the Core Ejector is very
straightforward as the saw’s pilot drill
slides through the internal diameter of
the nickel-plated spring. The narrowest
wrap of the spring is precisely sized to
sit on the shank of the drill, holding the
Core Ejector in position so it rotates
with the hole saw when it is in use and
keeping it correctly located when it is
not running.
Available in six sizes to cover a range
of hole saw diameters, the Core Ejector
works best for sheet material below
7mm thick with optimum performance
achieved with material between 2 to
5 mm thick. The range starts with the
KA8-1 Core Ejector for saws between
20 and 24mm diameter, stepping in
increments up to the largest KA8-6
for saws between 133 and 210mm
diameter.
“There is a lot of flexibility in the size
ranges and customers do not need to
stick to the sizes too rigidly,” says John
Cove. “During our tests we have taken
the KA8-1 and used it perfectly with a
38mm diameter saw. So, even though
the purchase cost is very reasonable at
just a few Pounds the number of units
required to cover a vast range of hole
sizes is very low.”
As well as ferrous and non-ferrous
sheet metal the Core Ejector also works
very effectively when applied to holes
generated in sheet GRP and composite
materials, as well as ceramics and tiles
when fitted to diamond hole saws.
Tel: 01835 863501
Email: [email protected]
www.starrett.co.uk
The Core Ejector
addresses these
problems in a simple
and reliable way.