Multi-Drilling Heads for Faster Multi-Hole Drilling Operations

A cover plate with eight holes, a flange with twelve, a housing with holes on three faces: drilling each hole individually repeats the same movements again and again, and every repetition adds time and a chance for error. A Multi-Drilling Head changes that equation by drilling many holes together. For plants that produce the same multi-hole components in volume, it is one of the most effective ways to shorten the cycle and keep hole positions consistent.

MT Industries designs these heads as part of its SPM solutions, matched to the component, the material and the target output, so that the machine fits the job rather than the other way round.

What Is a Multi-Spindle Head?

It is a gearbox-type attachment that carries several spindles and is driven by a single main spindle or motor. Each output spindle holds a drill, and the spindles are arranged to match the hole pattern on the component. When the head is fed forward, all the drills cut at the same time. It can be mounted on a Multi-Head Drilling SPM, a drilling unit or a dedicated machine. Because the spindle positions are fixed by the head, hole spacing depends on the machine rather than on the operator.

Types of Drilling Heads

• Fixed-centre heads: spindles are set permanently for one hole pattern, giving high rigidity for dedicated, high-volume components.
• Adjustable heads: spindle positions can be changed within a range, usually through articulated arms and universal joints, so that a family of similar components can be drilled.
• Angular and multi-face setups: heads arranged on different sides or at an angle to drill holes on several faces in one cycle.

The right type depends on how often the hole pattern is expected to change.

How the Head Works

A Precision Multi-Drill Spindle is only as good as the parts inside the head. Hardened gears transfer power from the drive to each spindle, and precision bearings hold the spindles in line and absorb the axial thrust of drilling. A lubrication system protects gears and bearings, and coolant can be supplied through or around the drills to clear chips. Spindle run-out and alignment must be tightly controlled, because even a small error is multiplied across many drills.

Benefits of Drilling Many Holes Together

• Shorter cycle time, as many holes are drilled in one stroke
• Consistent hole spacing and position across a batch
• Lower cost per hole
• Less handling and fewer set-ups
• Reduced operator fatigue
• Better use of floor space than several separate machines

The gains grow with every additional hole on the component.

Selection Factors

Choosing the right head means matching it to the job:

• Number, diameter and depth of holes
• Hole pattern and spacing, including the minimum centre distance between spindles
• Material and hardness of the component
• Drive power and thrust are available, since the total load rises with the number of drills
• Feed system, whether hydraulic, pneumatic or servo
• Coolant and chip evacuation
• Expected variants or future pattern changes

Closely spaced holes or hard materials can limit how many drills a head can carry, so the design stage matters.

Keeping the Head in Good Condition

Regular lubrication, periodic checks on bearings and gears, and cleaning of chips from the head and fixture keep performance steady. Drills should be changed in sets and sharpened to the same standard so that all spindles cut evenly. Checking spindle run-out at intervals catches wear before it affects hole quality.

Where These Heads Are Used

Typical applications include flanges, covers, brake parts, pump and valve bodies, motor housings and switchgear plates; anywhere several holes must be drilled in a fixed pattern at volume.

Final thoughts

MT Industries designs and builds special-purpose machines for industrial production. Its range covers drilling and tapping machines, multi-spindle heads, automated assembly systems and customised fixtures and tooling, all made around the customer’s component and output target. To discuss your requirement, visit mtindustries.in or contact the team through the website.

Frequently Asked Questions

How many spindles can a head carry?
It depends on hole spacing, drill size and the drive power available. Closely spaced holes limit the number.

Can it drill holes of different diameters together?
Yes, provided the power, thrust and feed suit all the drills at once.

Can it handle blind and through holes?
Yes, with depth control built into the feed system.

What if my hole pattern changes?
An adjustable head can cover a limited range of patterns. Larger changes usually need a new head.

If you are drilling multi-hole components one hole at a time, MT Industries can recommend a head that fits your component and output target