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3. OPERATION
3.1.
CUTTING INTERNAL THREAdS
3.1.1. to cut an internal thread through a solid piece of material, Drill a correctly sized hole using a
tapping drill - refer to the chart overleaf.
3.1.2. Ensure that the drilled hole is free from burrs and clear of swarf, apply a smear of suitable
lubricant.
3.1.3. Select a tap of the correct size and required thread. secure it in the tap wrench. Apply a smear of
lubricant to the tip of the tap.
3.1.4. Place the tap in the hole and grasp the tap wrench with both hands. Apply even pressure and
turn the tap clockwise until it begins to bite. Ensure that the tap is kept square to the work
piece at all times.
3.1.5. continue to turn the wrench until more resistance is felt (usually about ½ a turn) then give it a
¼ turn anti-clockwise until a slight click is felt. this is the swarf from the clockwise twist being
broken off.
3.1.6. continue to repeat this action until the tap has run almost its complete length (ensure that a
suitable lubricant is applied regularly).
to cut a thread in a blind hole, use the same instructions as above but take care not to jam
the tap in the bottom of the hole.
3.2.
CUTTING EXTERNAL THREAdS
3.2.1. Bevel the end of the workpiece to be threaded in order to make starting easier, and apply a
smear of lubricant to it.
note: the width of the workpiece should ideally be 0.125mm to 0.025mm undersize of the die.
3.2.2. select a die of the correct size and required thread, and apply a smear of lubricant in it.
3.2.3. Insert the die into the die stock, placing the chamfered threads side opposite to the lip of the die
stock, and turn the set screws, fitting them into the recesses on the outside surface of the
die. For the smaller dies, use the adaptor to fit them into the die stock.
3.2.4. Ensure that the die stock is kept square to the workpiece at all times. Leading with the
chamfered side of the die, start the threading operation by rotating the die clockwise on the
workpiece until it starts cutting into it.
3.2.5. continue to turn the die, the cut metal will fill the holes in the die and these should be broken off
by turning the die a ¼ turn anti-clockwise, every ½ a turn clockwise.
3.2.6. continue to repeat this action until a thread of the desired length has been cut (ensure that a
suitable lubricant is applied regularly).
3.3.
THREAd RENEWAL
3.3.1. the taps and dies in this set can also be used for thread renewal to damaged and/or rusty
threads. Ensure that the above instructions are followed and that care is taken when starting
the re-threading to ensure the original threads are used to avoid cross-threading.
NOTE: It is our policy to continually improve products and as such we reserve the right to alter data, specifications and component parts without prior notice.
IMPORTANT: no liability is accepted for incorrect use of this product.
WARRANTY: Guarantee is 12 months from purchase date, proof of which will be required for any claim.
INFORMATION: For a copy of our latest catalogue and promotions call us on 01284 757525 and leave your full name and address, including postcode.
Sole UK distributor, Sealey Group,
Kempson Way, suffolk Business Park,
Bury st. Edmunds, suffolk,
IP32 7AR
Original Language Version
01284 757500
Web
01284 703534
email
www.sealey.co.uk
sales@sealey.co.uk
AK303.V2
Issue: 1 - 06/09/10
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