GP drill series
One-shot machining and IT8 grade hole diameter accuracy with our PCD drill series!
Optimal tool specifications for each material shape, from solid hole to casted pre-hole drilling!
IT8 grade hole diameter one-shot finishing
High precision, long life, high speed machining with PCD cutting edges
Reduce tooling costs by reducing the number of tools
What is the GP drill series?
① GP drill
For solid hole drilling
Features: High precision machining with PCD edges
- PCD edges: 2
- IT8 grade hole diameter accuracy possible
- Surface roughness: < 3.2 µm Rz
- Roundness: < 8 µm
② GPT drill
For existing hole drilling
Features: Stable machining in casted holes
- PCD edges: 3
- IT8 grade hole diameter accuracy possible
- Surface roughness: < 3.2 µm Rz
- Roundness: < 8 µm
Amazing facts!
── Introducing ideas and technologies ──
The GP drill series uses PCD as the cutting edge material.
It has high welding resistance against aluminium and enables stable machining accuracy even in one-shot machining.
Our line-up includes a 2-edge GP drill for solid hole drilling and a 3-edge GPT drill for cast hole drilling.
By using the GP Drill Series, you can reduce machining time and tool costs in processes that traditionally require two steps.
High precision machining with diamond edges
Hole diameter variation
Reduced processing time
Processing time
Cost reduction
Cutting tool cost
This is the point!
Different number of cutting edges for solid holes or casted hole drilling
Why the 3-edge GPT drills are more effective for casted holes?
- The machining allowance for a casted hole is usually uneven due to misalignment
- Cutting force varies due to uneven machining allowance
3-edge drills are characterized by low resultant force and stable processing
Development / product concept
“Current status and challenges”
- With conventional carbide tools, one-shot machining was difficult due to aluminium welding onto the cutting edges.
- The development of near-net shape casting technology has increased the number of workpieces with casted holes within the industry. However, 2-edged GP drills had problems with unstable machining accuracy from machining the casted holes.
“Development points”
- The 2-edge GP drill has 2 PCD cutting edges that are highly resistant to aluminium welding, provides stable machining accuracy in one-shot machining.
- The 3-edge GPT drill has 3 PCD cutting edges which is apt for achieving more stable accuracy in machining casted holes.
Machining example
Solid hole drilling
Tools used
GP drill
Machining work
Aluminium block
Work material
ADC12 / ENAC-AlS11Cu2(Fe)
Tool diameter
ø10 mm
Cutting conditions
Feed: f = 0.2 mm/rev
Required accuracy
Hole diameter
Surface roughness
Roundness
Machining example
Casted hole drilling
Tools used
GPT drill
Machining work
Aluminium block
Work material
ADC12 / ENAC-AlS11Cu2(Fe)
Tool diameter
ø10 mm
Cutting conditions
Feed: f = 0.2 mm/rev
Required accuracy
Hole diameter
Position tolerance
Roundness
Product specification
- Tool specification
Tool name
GP drill
Target process
*One-shot processing of solid material
Setting diameter
ø5 mm ~
Standard conditions
Feed: f = 0.02D~0.15D mm/rev
Machining accuracy
Hole diameter IT8 grade
- Example of applicable work
Transmission case
Knock hole
- Tool specification
Tool name
GPT drill
Target process
Knock hole/Plug hole
Aluminium high precision hole/Cast hole
*One-shot machining of casted material
Setting diameter
ø6 mm ~
Standard conditions
Cutting speed: Vc = 50~300 m/min
Feed: f = 0.02D~0.05D mm/rev
Machining accuracy
Hole diameter IT8 grade
- Example of applicable work
Cylinder block
Plug hole