True circle Manmaru Z reamer
Stable & excellent finishing accuracy even in intermittent cutting!
Excellent guiding properties + PCD cutting edge!
Suitable for high-precision and intermittent holes!
Excellent machining accuracy due to all-round guide + single PCD edge
Improved welding resistance by DLC coating
Amazing facts!
── Introducing ideas and technologies ──
The true circle Manmaru Z reamer consists of an all-round guide + a single PCD edge.
The all-round guide provides excellent guiding performance even in intermittent machining and enables stable machining.
Furthermore, the single PCD edge specification + DLC coating specification improves resistance to welding and realises ‘high-precision machining’.
Excellent roundness
Good!
Roundness in intermittent processing
Stable hole diameter
Good!
Hole diameter variation in intermittent processing
Improved welding resistance with DLC coating
Good!
Surface
roughness
This is the point!
High guiding properties ensure high accuracy
Excellent!
Development / product concept
“Current status and challenges”
- 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
“Development points”
- All-round guide + single PCD edge supresses tool undesired tool behaviour during machining.
Excellent machining accuracy even in intermittent cutting. - DLC coating prevents aluminium welding, which is a concern with all-round guides
Machining example
Intermittent hole
Tools used
True circle Manmaru Z reamer
Machining work
Work material
JIS AC2C-T6 / ISO Al-Si5Cu3Mn
Tool diameter
ø31 mm
Cutting conditions
Cutting speed: Vc = 292 m/min
Feed: f = 0.22 mm/rev
Machining allowance
ø0.3 mm
Required accuracy
Lifter hole
Roundness
Hole diameter
Product specification
- Tool specification
Tool name
True circle Manmaru Z reamer
Target process
Valve seat / guide press-fit hole, spool hole, lifter hole, aluminium high precision hole
Setting diameter
ø5 mm ~
Cutting conditions
Cutting speed: Vc = 50~400 m/min
Feed: f = 0.05~0.2 mm/rev
Machining accuracy
Hole diameter IT7 grade
- Example of applicable work
Cylinder head
