G7 drill series
Carbide drill series for one-shot machining with IT7 grade hole diameter accuracy!
Astonishing finishing accuracy produced by “drilling edge” + “special reaming edge”!
IT7 grade hole diameter accuracy in one-shot
Line-up for solid holes, cast holes, and high feeds
What is the G7 drill series?
① G7X drill
For solid hole drilling
Features: High-precision machining with special reamer edges
- Drilling edges: 2
- Reaming edges: 2
- Accuracy: hole diameter IT7 grade
- Surface roughness: 6.3z or less
- Cylindricity: 8µm or less
② G7T drill
PAT. PENDING
For cast holes drilling
Features: Stable machining even with cast holes
- Drilling edges: 3
- Reaming edges: 3
- Accuracy: hole diameter IT7 grade
- Surface roughness: 6.3z or less
- Cylindricity: 8µm or less
③ Y7 drill
For high feed processing
Features: High feed version of G7X with twisted flute
- Drilling edges: 2
- Reaming edges: 4
- Accuracy: hole diameter IT7 grade
- Surface roughness: 6.3z or less
- Cylindricity: 8µm or less
Amazing facts!
── Introducing ideas and technologies ──
The G7 drill series consists of a drilling edge and a special reaming edge.
By separating each flute, chips from the cutting edge are discharged separately to eliminate chip entrapment, while the reaming edge uses a special cutting edge profile to realise one-shot drilling in IT7-grade holes.
The line-up includes the G7X drill for solid holes, the G7T drill for cast holes and the Y7 drill as a high feed version of the G7X drill.
G7X drill (solid hole)
IT7 grade hole accuracy
Good!
G7T drill (cast hole)
IT7 grade hole accuracy
Good!
Y7 drill (high feed)
High precision machining
Good!
This is the point!
The role of the cutting edge is divided by function
Excellent!
Optimizied phasing of drill and reamer edges prevents chips from being caught
High precision machining with special reamer cutting edges
Development / product concept
“Current status and challenges”
- With the shift from specialised machines to general-purpose machines, the need for drill reamers that combine drill and reamer in one machine has increased in order to reduce cycle time
- However, problems remained, such as problems caused by chip entrapment and inconsistent machining accuracy
“Development points”
- Optimised phasing of the drill and reamer edge improves chip evacuation.
- The reamer edge uses a special cutting edge profile to improve machining accuracy and achieves IT7-grade hole diameter accuracy.
Machining example
Solid hole
Tools used
G7X drill
Machining work
Aluminium block
Work material
ADC12 / ENAC-AlS11Cu2(Fe)
Tool diameter
ø6 mm
Cutting conditions
Cutting speed: Vc = 150 m/min
Feed: f = 0.2 mm/rev
Required accuracy
Hole diameter
Surface roughness
Machining example
Casted hole
Tools used
G7T drill
Machining work
Aluminium block
Work material
ADC12 / ENAC-AlS11Cu2(Fe)
Tool diameter
ø10 mm
Cutting conditions
Cutting speed: Vc = 150 m/min
Feed: f = 0.2 mm/rev
Required accuracy
Hole diameter
Roundness
Positional tolerance
Product specification
- Tool specification
Tool name
G7X drill
Target process
Knock hole, aluminium high precision hole / solid hole
*One-shot processing from raw materials
Setting diameter
ø5 mm ~
Standard conditions
Cutting speed: Vc = 50~200 m/min
Feed: f = 0.1~0.2 mm/rev
Machining accuracy
Hole diameter IT7 grade
- Tool specification
Tool name
G7T drill
Target process
Knock hole, aluminium high precision hole / cast hole
*One-shot processing from raw materials
Setting diameter
ø5 mm ~
Standard conditions
Cutting speed: Vc = 50~200 m/min
Feed: f = 0.1~0.2 mm/rev
Machining accuracy
Hole diameter IT7 grade
- Tool specification
Tool name
Y7 drill
Target process
Knock hole, Aluminium high precision hole / Solid hole
*One-shot processing from raw materials
Setting diameter
ø6 mm ~
Standard conditions
Cutting speed: Vc = 50~150 m/min
Feed: f = 0.2~0.4 mm/rev
Machining accuracy
Hole diameter IT7 grade
- Example of applicable work
