Clarke CDP151B Bedienerhandbuch PDF herunterladen (Seite 15)

CUTTING SPEEDS

Factors which determine the best speed to use in any drill press operation are:

1. Kind of material being worked.

2. Size of hole.

3. Type of drill.

4. Quality of cut desired.

Generally, the smaller the drill, the greater the required RPM. In soft material, the

speed should be higher than for hard metals.

As a guide, the drill speed for a given drill bit size, is according to the table below.

Wood

2740

1410 -

2270

970 -1280 480 - 580

250 - 400 180

Speed Range

(RPM)

in3/81/2----

mm 9.5 12.5 - - - -

Zinc in 1/4 3/8 1/2 - - -

Diecast mm 6.4 9.5 12.5 - - -

Alum & in 7/32 11/32 15/32 - - -

Brass mm 5.6 8.75 12 - - -

in 3/16 5/16 7/16 - - -

mm 4.8 7.9 11 - - -

Cast Iron in 1/8 1/4 11/32 1/2 - -

& Bronze mm 3.2 6.4 8.75 12.5 - -

Mild Steel in 3/32 5/32 1/4 3/8 1/2 -

& Malleable mm 2.4 4 6.4 9.5 12.5 -

Cast Steel in 1/16 1/8 3/16 5/16 7/16 1/2

& Med Carbon mm 1.6 3.2 4.8 7.9 11 12.5

Stainless in 3/64 1/16 1/8 1/4 3/8 1/2

and Tool Steel mm 1.2 1.6 3.2 6.4 9.5 12.5

Plastic

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Clarke CDP151B Bedienerhandbuch Seite 15