Section J 25-26

Indexable Insert Drills WDX Series

■ Lathe Machining Guidelines

■ Drill Mounting · Set the drill so that the peripheral insert is parallel to the X axis of the machine. (Fig.1) · Press the end of the flange of the drill tightly against the face of the holder when tightening the bolt.

Internal bore smaller

Internal bore larger

■ Adjusting work diameter (offset) · The work diameter is adjustable by moving the machine X axis.

Central Insert

Machine X axis

Peripheral Blade

· Make the adjustment by moving in the positive direction of the X axis (enlarging the bore diameter). Moving the X axis in the negative direction (to reduce the bore diameter) is not recommended as the holder may interfere with the hole. (See Fig. 1) · The maximum allowable adjustment (offset) differs depending on the drill diameter. ■ Other notes · ‌When the drill is mounted on a lathe, the center of the central insert is designed to be 0.15 to 0.2 mm below the centre of the spindle. · ‌If the spindle deviates so far off centre that the centre of the central insert lies above the spindle centre, the central insert will break. · ‌Set the depth of cut for turning or internal boring work to 1/5 or less of the drill diameter (max. 5 mm or less). (Example: Set depth of cut to 4 mm or less for a drill diameter of ø20 mm) · I‌nstall a cover to prevent injury from possible chip fly-out (see disc-shaped chip in Figure 2) when through boring on a lathe. If your equipment has no cover, attach a cover or similar part for your safety.

Fig. 1

Fig. 2

■ Typical Power Ratings

■ Typical Coolant Volume

10 12

10 15 20 25 30 35 40

f0.24

For drill diameters ø0.750” to 2.250” , coolant pressure of at least 1.0 MPa is recommended.

For drill diameters ø0.500” to 0.709” , coolant pressure of at least 2.0 MPa is recommended.

f0.12

f0.18

0 2 4 6 8

f0.06

0 5

0.394 0.594 0.787 1.000 1.188 1.375 1.563 1.750 2.000 2.250

Drill Diameter (DC)

·‌Before mounting the insert, remove all traces of foreign matter on the insert seat using air or other means. · When using the wrench, align it to the axis of the screw and press while turning. (See Fig. 3) If the wrench is not aligned with the screw, the insert will be insufficiently clamped and the tip of the wrench and/or the Torx hole of the screw may become deformed. · ‌Do not allow clearance between the insert seat and drill when mounting the insert (Fig. 4, Part A). Figure 4 shows a properly mounted insert. * ‌It is normal for the outer sides of the central insert to have clearance because it is clamped at its center and pushed to the rear. ■ Precautions for Attaching and Removing Inserts <CAUTIONS> ● Power ratings are subject to change based on conditions such as work material and cutting speed, and should only be used for reference. ● Cutting Conditions (Reference) Work Material: S50C (230HB) Cutting Speed: v c=492 SFM

<CAUTIONS> ● Coolant volume is a factor that affects drilling performance, particularly with respect to chip evacuation and lubricity. This is particularly important for chip evacuation and lubricity. ● Coolant pressure should be set higher for small drills. (ø18.0 mm or smaller) ● Coolant volume is usually adjusted by changing the coolant pressure provided on most CNC machines. ● This table provides guideline values only. More coolant may be required depending on the machine, coolant and work material.

Using a Wrench

Insert Attachment

Peripheral Insert Insert

Central Insert

Clearance is normal and does not affect use.

■ Troubleshooting

Fig. 3

Fig. 4

Problem

Symptom

Cause

Countermeasures

Drilled hole diameter is larger than desired Drilled hole diameter is smaller than desired Pronounced difference in hole diameter at entrance and bottom Poor machined surface from entrance to bottom of hole Poor machined surface at bottom of hole

· Deflection of the holder due to high thrust force · The cutting edge backs off and does not enter the workpiece

· Decrease the feed rate to decrease the thrust force. · Make an adjustment on the X axis.

Too much variation in hole diameter

· Increase the feed rate. · Make an adjustment on the X axis.

· Packing of chips

· Increase the feed rate to improve chip evacuation. · Use an L breaker for chip control.

· High cutting force · Low rigidity of workpiece

· Decrease the feed rate. · Review tooling to improve rigidity.

Poor quality machined hole surface

· Machined surfaces damaged by chips

· Increase the feed rate to improve chip evacuation. · Use an L type breaker for chip control. · Check the centre height again. · If the drill is being used on a lathe, try flipping the drill 180°. · Use a strong edge chipbreaker (H). · Decrease the feed rate to decrease cutting load. · Use a strong edge chipbreaker (H).

Breakage on central insert (centre)

· Improper adjustment of centre height · Insert is not strong enough

Insert is broken

Breakage on peripheral insert

· High cutting load in cutting edge

J138

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