Machine Taps.

What are Machine Taps?

Machine taps, also known as machining taps, are precision-engineered cutting tools designed specifically for use with machine tools such as CNC mills, drill presses and lathes. 

Unlike traditional hand taps, which require a multi-stage manual process, machine taps are engineered to cut a complete, clean thread in a single operational pass.

Accu's precision-engineered machine taps are built for performance, ensuring they maintain tight engineering tolerances. They feature specific cutting geometries, coatings and finishes to cut clean, precise threads during high-speed production.

How Machine Taps Work

Machine taps operate by being secured into a machine spindle or tapping chuck, which precisely controls the rotational speed and feed rate as the tool enters a pre-drilled pilot hole. As the tap rotates, its sharp cutting edges shear away material to form precise internal threads within a billet or workpiece.

The flute geometries available offer accuracy and reliability at scale by changing how chips are handled: spiral point taps push chips forward through open holes, while spiral flute taps pull chips upward out of blind holes, ensuring the cutting path remains completely clear. 

For example, when an automotive or aerospace manufacturing facility needs to tap hundreds of threaded holes in a production run of aluminium billets, using high-speed machine taps ensures unparalleled consistency, drastically reducing cycle times and eliminating the risk of tool breakage associated with manual tapping.

Materials Machine Taps Are Made From

Accu offers machine taps manufactured with an emphasis on modern engineering and rigorous quality standards. Our range uses materials such as:

• Steel - HSS: Offers exceptional hardness, wear resistance, and thermal stability, allowing the tool to maintain its sharp cutting edge even under the high temperatures and friction generated during continuous machining cycles. 

Size and Types of Machine Taps Available

Our extensive range of machine taps is designed to suit various manufacturing specifications and technical demands. To maximise tool longevity and performance across different workpiece materials, these taps are available in a variety of advanced surface finishes, including: 

• Bright
• Hardslick Coated
• Nitride Coated
• TiAIN Coated
• TiCN Coated
• TiN Coated
• VAP Coated
• X Coated
• Black Oxide Coated
• CrN Coated
• AlCrN Coated

In terms of dimensions, we offer a comprehensive sizing spectrum spanning: 

• Metric Coarse: M2 (2 mm) up to M52 (52 mm).
• Metric Fine: M4 (4 mm) to M36 (36 mm).
• UNC: 4-40 to 1.1/8-7.
• UNF: 4-48 up to 1-12.

Flute lengths range from 5 mm to 65 mm, ensuring compatibility with varying hole depths. To accommodate specific chip-clearing requirements, engineers can select from three core geometries: 

• Spiral Flute
• Spiral Point
• Straight Flute

FAQs

Q: What is the difference between a machine tap and a normal tap?

A: A machine tap is explicitly engineered for automated, continuous operation in machine tools at higher speeds, cutting a complete thread profile in one single pass. A "normal" tap often refers to a traditional hand tap, which is typically used in a set of three (taper, second and bottoming) and operated manually with a tap wrench.

Q: What are the different types of machine taps?

A: The primary types are defined by their flute geometry to suit different hole types. Spiral point taps feature angled points that push chips forward, making them ideal for through-holes. Spiral flute taps feature helical grooves that lift chips upward, making them ideal for blind holes. Straight flute taps are general-purpose options often used for short-chipping materials.

Q: What is the difference between hand taps and machine taps?

A: Hand taps are designed for manual rotation, featuring shorter shanks and distributed cutting loads across a multi-tap set to make manual hand-tapping manageable. Machine taps feature robust construction, specialised chip-evacuation geometries and reinforced shanks engineered to withstand the high torque, constant feed and rotational forces exerted by power machinery.

Q: How to use a machine tap?

A: To use a machine tap, first drill a pilot hole matching the correct tapping drill size for your desired thread specification. Secure the tap into a suitable machine chuck or synchronised tapping holder on a mill, lathe or drill press. Set the correct cutting speed and feed rate based on the workpiece material, apply appropriate cutting fluid or coolant to reduce friction and let the machinery drive the tap smoothly into the hole to form the threads in a single pass.

Bespoke Machine Taps Manufacture.

High precision, bespoke manufacture of Machine Taps to customer specification. State of the art facilities specialising in both small batch prototyping and large scale manufacture.