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Manmaru reamer

Stable & excellent finishing accuracy even in intermittent cutting!

‘Excellent guiding properties’ + ‘PCD cutting edge’ for high precision and intermittent holes
  • Excellent machining accuracy due to all-round guide + single PCD edge
  • Improved welding resistance by DLC coating

“Amazing Ideas / Facts!”

The True Circle (manmaru) reamer consists of an all-round guide + a single PCD edge.
The all-round guide provides excellent guiding performance even in intermittent cutting and enables stable machining.
In addition, the single PCD edge + DLC coating improves resistance against welding and results in ‘high-precision machining’.

Excellent Roundness

Stable Hole Diameter

Improved Welding Resistance with DLC Coating

POINT! High guiding properties provides high accuracy.

Background / Point for Development

Background

  • When there are side holes or grooves in the machined hole, intermittent cutting occurs, and the hole diameter and roundness are not stable with conventional two-edge PCD reamers, making high-precision machining difficult.

Point for Development

  • All-round guide + single PCD edge prevents the tool from making undesired behaviour during machining, which results in an excellent machining accuracy even in intermittent cutting.
  • DLC coating prevents aluminium welding, which was a concern with all-round guides.

Example

ToolManmaru Z reamer
WorkpieceCylinder head (Lifter hole)
MaterialAC2C-T6
Tool Diameterø31mm
Cutting
Conditions
  • Cutting speed: V=292m/min
  • Cutting feed: f=0.22mm/rev
Machining
allowance		ø0.3
Required
accuracy		Required accuracy

Lifter Hole

Roundness

Hole Diameter

Product Specification

Tool Specification

Process
covered		Valve seat, guide press-fit holes, spool holes, lifter holes and aluminum high-precision holes
Diameterø5 –
Standard
conditions
  • Cutting speed: V=50 – 400mm/min
  • Cutting feed: f=0.05 – 0.2mm/rev
PerformanceIT7

Applicable work example