Dormer PrametUnit 4 Lindrick Way S43 4XE Barlborough, Chesterfield, United KingdomT: 0870 850 4466F: 0870 850 8866
Taps with interrupted thread: The interrupted thread ensures less friction and therefore less resistance, which is particularly important when threading material which is resilient and difficult to machine (e.g. aluminium, bronze).
Ball nose end mills feature a semi-sphere at the end of the tool and are used extensively in the machining of dies, moulds, and on workpieces with complex surfaces.
The correct use of Morse Taper Shank drills relies on an efficient fit between the taper surfaces of the tool and the tool holder. The use of a soft-faced hammer should be used to drive the drill into the holder.
In climb milling, also called down milling, cutting starts with the chip at its thickest location. The feed movement and the tool rotation have the same direction. Climb milling is the first choice.
Select the correct cutting speed as shown in Dormer's Catalog and Product Selector
The use of suitable coolants and lubricants are recommended as required by the particular drilling operation. When using coolants and lubricants, ensure a copious supply, especially at the drill point.
Use appropriate cutting fluid for the workpiece material. Numerous different types of lubricant are available, including oils, aerosols and compounds. Some contain Chlorine which can result in staining of certain materials eg. Aluminium. In such cases, ensure a chlorine-free lubricant is used.
Swarf evacuation while drilling is essential in ensuring the correct drilling procedure. Never allow the swarf to become stationary in the flute.
In conventional milling, also called up milling, the maximum chip thickness is at the end of the cut. The feed movement is opposite to the tool rotation.
Remember, the pre-drilling sizes for fluteless taps are different to those for conventional thread cutting taps. During the drilling operation, always ensure that work hardening of the component material is kept to a minimum.