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The Ultimate Guide to Different Drill Bit Types: How to Choose the Right Tool for the Job

Dezhou Drillstar Cutting Tool Co., Ltd. officially resumed production amidst a festive and auspicious atmosphere.

Dezhou Drillstar Cutting Tool Co., Ltd. 2026 Year of the Horse Gala: A Resounding Success – Forging Precision, Riding the Wind of Progress

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Floating Pad, for Deep Hole Boring Tools

Floating Pad, for Deep Hole Boring Tools

The Floating Pad (also known as a Floating Guide Pad) is a critical guiding component in deep hole boring tools (specifically BTA and Ejector systems). Unlike fixed pads, floating pads utilize a spring-loaded or hydraulic mechanism to maintain constant contact with the borehole wall. This “floating” action dynamically compensates for tool deflection, ensuring superior straightness and surface finish in deep hole machining.

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Description

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Core Function & Working Principle

Dynamic Centering: The pad automatically adjusts its position based on radial cutting forces, keeping the boring head concentric with the borehole axis.
Vibration Damping: The spring mechanism acts as a shock absorber, minimizing chatter and vibration during high-speed machining, which is essential for achieving mirror-like surface finishes (Ra ≤ 0.4 μm).
Wear Compensation: As the carbide face wears, the floating mechanism pushes the pad forward to maintain consistent contact pressure, extending the effective life of the tool assembly.

Key Structure & Materials

Component	Description	Material/Standard
Carbide Insert	The contact face that rides against the borehole wall.	Tungsten Carbide (YG8 / YG6 / YT15) Hardness: ≥ HRA 90 High wear resistance.
Holder/Body	The housing that contains the insert and spring mechanism.	Alloy Steel (40CrNiMoA) Heat treated for high fatigue strength.
Spring Mechanism	Provides the floating force; can be coil spring or hydraulic.	High Carbon Spring Steel Designed for millions of cycles without fatigue.
Coolant Groove	Channels coolant to the pad/hole interface to reduce friction.	Machined into the carbide insert.

Technical Parameters (General Reference)

Parameter Category	Specifications	Notes
Floating Stroke	0.5 – 2.0 mm	The total distance the pad can move radially.
Floating Force	50 – 300 N (Adjustable)	Determines contact pressure; higher for roughing, lower for finishing.
Pad Dimensions	Customizable (L x W x H)	Standard sizes: 10x10mm, 12x12mm, 15x15mm, 20x20mm, etc.
Surface Finish	Ra ≤ 0.4 μm	Achievable surface finish on workpiece when using these pads.
Fit Tolerance	H7 / h6	Precision fit within the boring head slot.
Operating Temperature	Up to 400°C	Stable performance under high cutting heat.

Application Scenarios & Selection Guide

Primary Application:
- Deep Hole Finishing: Mandatory for achieving IT7 tolerance and mirror finishes.
- Unstable Workpieces: Ideal for machining thin-walled tubes or workpieces where clamping is difficult (the pad stabilizes the tool).
- Long-Depth Drilling: Critical for holes with depth-to-diameter ratios > 20:1 to prevent walking.
Selection Criteria:
- Operation Type: Use Floating Pads for finishing (Reaming/Boring). Use Fixed Pads for roughing (Drilling) to withstand higher impact forces.
- Workpiece Material:
  - Steel/Alloy: Select YG8 (High toughness).
  - Cast Iron/Aluminum: Select YG6 (Higher wear resistance).
- Pad Quantity: Typically 3 pads per head, arranged at 120° intervals.

Advantages & Maintenance

Core Advantages:
- Self-Centering: Eliminates the need for precise pre-alignment of the tool.
- Higher Speed: Allows for higher cutting speeds due to reduced friction and vibration.
- Tool Life: Protects the expensive boring head body from wear; only the carbide pad needs replacement.
Maintenance Tips:
- Cleanliness: Ensure coolant is filtered (≤ 20 μm) to prevent debris from jamming the floating mechanism.
- Lubrication: Use high-performance cutting oil (not emulsion) to lubricate the pad interface.
- Inspection: Check the spring tension regularly; replace if the pad feels “loose” or fails to retract smoothly.

Typical Sizes (Example)

Model No.	Pad Size (L x W x T)	Floating Stroke	Compatible Hole Diameter
FP-1212	12 x 12 x 5 mm	1.0 mm	40 – 60 mm
FP-1515	15 x 15 x 6 mm	1.5 mm	60 – 100 mm
FP-2020	20 x 20 x 8 mm	2.0 mm	100 – 200 mm
FP-2525	25 x 25 x 10 mm	2.5 mm	> 200 mm

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Products

The Ultimate Guide to Different Drill Bit Types: How to Choose the Right Tool for the Job

Dezhou Drillstar Cutting Tool Co., Ltd. officially resumed production amidst a festive and auspicious atmosphere.

Dezhou Drillstar Cutting Tool Co., Ltd. 2026 Year of the Horse Gala: A Resounding Success – Forging Precision, Riding the Wind of Progress

Floating Pad, for Deep Hole Boring Tools

Description

marker

Core Function & Working Principle

Key Structure & Materials

Technical Parameters (General Reference)

Application Scenarios & Selection Guide

Advantages & Maintenance

Typical Sizes (Example)

Contact us

* Name

*Email

Phone / WhatsAPP / WeChat

* What I have to say.

Related Popular Products

Wear-Resistant Bushing

Hardened Metal Ground Cylinder

Cemented Carbide Wear-Resistant Block

Coal Picks

Carbide Cutting Teeth

Brazed Carbide Tip Gun Drills

Stellite Alloy

Valve Internals Series

Stellite Alloy Welding Electrode

B6 Stellite Alloy Sheet

Stellite Stabilizer Shaft Bushing

CK61100 CNC lathe machine

Deep Hole Forming Tool

DR Hydraulic Scrapinghob Drill

Milling Cutter Grinding Machine

Iron-based Wrought High-temperature Alloys

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