CNC Drilling Machine Parts Adjustable Boring Drilling Head For Drill Router Bits

Need one boring head that covers bore spacing from 20 mm to 112 mm? The PLA-368 adjustable boring head does, and the PLA-168 version covers 14–90 mm. Both take drill router bits, are rated to drill up to φ40 mm in wood and plastic steel, and take a bearable rotation speed of 4500 rpm. The wheelbase is set on the head itself, so one head covers hole patterns that would otherwise need a fixed head each. Both models fit woodworking drilling and boring machines.

A shop that bores panels on a woodworking drilling machine usually meets the same three problems: a separate fixed head for every hole pattern, a scrapped panel each time the bore spacing has to move, and a machine standing idle while the right head is found. The PLA-368 and PLA-168 adjustable boring heads are made to clear all three.

This is an adjustable boring drilling head: one head whose centre distance is set on a sliding wheelbase instead of being fixed into a single pattern. On the PLA-368 the wheelbase travels 20–112 mm; on the PLA-168 it travels 14–90 mm. That 92 mm of travel lets one head serve patterns that otherwise take several, and its drill router bit interface means boring and routing share the same head.

Drilling capacity is φ40 mm in wood and plastic steel, the largest bit the head is rated for. Bearable rotation speed is 4500 rpm, so a spindle at or below 4500 rpm stays inside the limit. The two models share the same bit interface and differ only in wheelbase: 20–112 mm on the PLA-368 against 14–90 mm on the PLA-168.

Both heads fit woodworking drilling and boring machines, the units used for panel furniture, cabinet fronts and dowel joints. The head is a spare part ordered by model number; the head in the product photos is the PLA-368.

Eight things the two models are actually specified for:

• Wheelbase 20–112 mm (PLA-368). The centre distance is set anywhere inside a 92 mm window, so one head covers what fixed heads need one each for.
• Wheelbase 14–90 mm (PLA-168). The smaller model reaches 14 mm, under the 20 mm floor of the PLA-368.
• Drilling capacity φ40 mm. φ40 mm is the largest bit the head is rated for, in wood and plastic steel.
• Bearable rotation speed 4500 rpm. 4500 rpm is the ceiling of the head, so a spindle run at or below it stays inside the rated speed.
• Drill router bits fit directly. The head is specified for drill router bits, so boring and routing run from one head body.
• Adjustable, not fixed. The wheelbase is moved by hand on the head itself, in the 20–112 mm or 14–90 mm range, rather than swapped as a fixed head.
• Fits woodworking drilling and boring machines. It is a spare part for woodworking drilling and boring machines, the units that bore panel furniture.
• Two models, one bit interface. PLA-368 and PLA-168 differ only in wheelbase, 20–112 mm against 14–90 mm, so one set of drill router bits serves both.
• Photo and part number agree. The head in the photos is the PLA-368, so the shape can be matched to the number before ordering.

The usual choice is buying a fixed head for every hole pattern, sending the panel out, or boring it by hand. An adjustable head removes the first option from that list.

• One part number instead of a rack of fixed heads. A 20–112 mm wheelbase does on one head what fixed heads need several of, and the PLA-168 reaches down to 14 mm.
• A pattern change is a hand adjustment. The wheelbase is moved on the head, inside 20–112 mm or 14–90 mm, instead of waiting for another fixed head.
• φ40 mm keeps bigger bits on the same head. Anything to φ40 mm in wood and plastic steel runs here, so no second unit for the larger bores.
• 4500 rpm leaves the head off the limit list. With a bearable speed of 4500 rpm, a spindle run at or below that is inside the rating.
• The bits a shop already holds fit. Drill router bits are the specified interface, so a boring job brings no new bit family.
• Re-ordering takes a number, not a drawing. PLA-368 or PLA-168 on the parts list is enough to reorder the same head.
• A part, so the machine stays. Replacing the head keeps an existing woodworking drilling machine boring panels instead of putting a whole machine on the replacement list.

Pick by the bore spacing you run: the PLA-368 covers 20–112 mm and the PLA-168 covers 14–90 mm. If your tightest pattern needs centres under 20 mm, the PLA-168 is the one that reaches it; if your widest pattern runs over 90 mm, the PLA-368 is the one that covers it. The head in the product photos is the PLA-368.

Adjustable. The wheelbase moves on the head itself, 20–112 mm on the PLA-368 and 14–90 mm on the PLA-168, so one head serves a range of patterns instead of one pitch.

φ40 mm. The rated drilling capacity is max. φ40 mm in wood and plastic steel, measured on the largest bit the head is specified for.

4500 rpm. The maximum bearable rotation speed is 4500 rpm, so a spindle set at or below that figure runs within the rating of the head.

Drill router bits. The head is specified for drill router bits, so boring and routing work share the same head body.

Woodworking drilling and boring machines. That is the application listed for both models, the units that bore panel furniture, cabinet fronts and dowel joints.

Yes. PLA-368 and PLA-168 share the same bit interface and differ only in wheelbase, 20–112 mm against 14–90 mm, so one set of drill router bits serves both heads.

Price is quoted on request. Send the model, PLA-368 or PLA-168, and the quantity you need, and the quote comes back against that model and quantity.