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GB Tool

(Guide-pad Boring Tool)

The Ultimate Solution for Jump & deep Hole Reaming!

Achieve high-precision jump & deep hole reaming with machining centers. The boring holders come with optimal guide pads.
  • Guide pads layout contributes to high accuracy.
  • Easy to operate with fine adjustment capabilities.
  • Dedicated setting gauges are also available.

“Amazing Ideas / Facts!”

The GB tool consists of two rough edges and one finishing edge.
Optimal guide pad placement, tailored to resist the cutting force, allows the tool to self-guide through the machined hole, achieving excellent roundness and straightness in jump hole drilling with machining centers.
Additionally, our unique fine adjustment mechanism enables easy setting.

GB Tool Configuration

Process Sequence

POINT! Optimal guide pad placement, tailored to cutting resistance

POINT! Fine adjustment with easy operation, Single action type for rough

POINT! Fine adjustment with easy operation, Double action type for finish

Adjustment

  1. ① Secure the insert with the clamping screw.
  2. ② Adjust the diameter with the diameter adjusting screw.
  3. ③ Adjust the back taper with the adjusting screw.

Dedicated Setting Gauge

Gauge for Cutting Edge Diameter and Back Taper Adjustment

Background / Point for Development

Background

  • To reduce investment and accommodate diverse production, transitioning from specialized machines to general-purpose machines is essential.
  • However, performing jump hole drilling on general-purpose machines presents challenges in maintaining positional accuracy and straightness, as they lack the support provided by specialized machines.


Point for Development

  • The GB tool features optimal guide pad placement, allowing it to self-guide through the machined hole. This suppresses cutting edge displacement, enabling high-precision jump hole drilling on general-purpose machines. As a result, it achieves both cost reduction and adaptability to diverse production needs.

Example

WorkpieceCylinder Head (cam hole)
MaterialAC2C-T6
Tool Diameterø26 mm
Cutting ConditionsRevolution: S=2957 min-1
Cutting speed: V=260 m/min
Cutting feed: f=0.1 mm/rev
CoolantInternal Supply,
Water-Soluble 10%
Machining
accuracy		Meets the precision requirements as shown in the table.
Required accuracy

Roundness / Coaxiality

Product Specification

Tool Specification

Standard
conditions		Cutting speed: V=200 – 300 m/min
Cutting feed: f=0.1 – 0.2 mm/rev
Internal coolant required
Coolant concentration: 5% min.
Diameterø16 – (single action)
ø22 – (double action)

Example of Applicable Work

ProcessesCam Hole of Cylinder Head,
Steering housing
Coaxiality8 µm
Surface roughness3.2 Rz
DiameterIT7