Thickness planer

A thickness planer ( regionally also inaccurately called Thicknesser ) is a power tool for woodworking. It works similar to a milling machine. The task of the planer is planing a workpiece to a desired thickness after it was straightened when dressing using the planer.

Design and operation

The planer has several parts with different functions:

  • The planer knife is used for chip removal, it has between 1 and 2 or 4 blades. This rotates at 4000 to 9000/min opposite to the feed direction (climb ) the piece of wood, and planed it to the desired thickness. The rotation speed depends on the shaft diameter.

In the planer knife, there are basically three types.

  • Gibs blade shaft ( standard ) 2-4 planer knives
  • Turning diameter shaft ( easier conversion, the blades can be used on both sides) 2-4 planer knives
  • Spiral blade shaft ( best surface quality ) 1 planer knives

Some manufacturers offer segmented spiral knife planing shafts with inserts for their machines as an option. This single HW inserts are placed ( square shape with four (ideally with cambered ) main cutting edges and an edge length of about 20 mm ) onto the blade shaft ( with shaft angle ) that the sheaths have a minimum coverage. The surface quality is again slightly better than the systemic very good surface quality in a normal spiral blade cutter block, as the Messerschitt (Sz ) is even lower. Due to the effective blade geometry is to be expected with a surprisingly good surface quality even in very difficult material properties. Since damaged blades can be replaced by turning through 45 ° or change a single insert very fast, this is very efficient. However, a complete change (up to 100 inserts depending on the planer width) of the inserts associated with significant time and cost. But as it usually is reversible TC plates, is expected to up to 20 times greater tool life than HSS knives., However, have hardware cutting to a greater wedge angle (approximately 60 ° ) as the HSS cutting ( about 50 ° ) so that the force required for the feed movement is a little larger. A positive aspect of this planer design lies in the considerable reduction of noise emission by about 12 dB (A).

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