Makita HB500 Specifications download pdf (Page 4)

Feeds and sPeeds

PLEASE NOTE: These ﬁgures are quoted as a starting point. Actual performance will be dictated by material

type, thickness and hardness, application and cutter condition.

Speed (RPM)

MATERIAL

Feed rate (mm/min)

ALUMINIUM - 60

BRASS - 45

MILD STEEL - 24

HI TENSILE STEEL

- 9

Cutting SpeedS Suggested speed rates for varying cutter sizes/materials

Speed (RPM)

Cutter Diameter (inches)

MATERIAL

Feed rate (inches/min)

ALUMINIUM

“

BRASS

“

MILD STEEL

1”

HI TENSILE STEEL -

“

TOOL FEED RATE

(Imperial)

TOOL FEED RATE

(Metric)

Cutter Diameter (mm)

1000

900

800

700

600

500

400

300

200

100

1000

900

800

700

600

500

400

300

200

100

• The ease with which material can be drilled

is dependant on several factors including

tensile strength and abrasion resistance.

Whilst hardness and/or strength is the usual

criterion, wide variations in machinability can

exist among material showing similar physical

properties.

• The cutting conditions can be dependent

upon requirements for tool life and surface

ﬁnish and further restricted by the rigidity of the

tool and work piece, lubrication and machine

power available.

• The harder the material the lower the

cutting speed. Some materials of low hardness

contain abrasive constituents leading to rapid

cutting edge wear at high speeds. Feed rates

are governed by rigidity of set up, volume of

material to be removed, surface ﬁnish and

available machine power.

• It is preferable to set and maintain a constant

surface speed (RPM) for a given material and

vary the feed rate within deﬁned limits.

• Machine feed is measured in inches or

millimetres per minute and is the product of

RPM x number of teeth in the cutter x feed per

tooth. Too light or excessively high feed rates

will both cause premature cutter failure. Heavy

feeds on hard materials will cause chipping of

the cutting edge and excessive heat generation.

• Slender and long shanked cutters are

restricted in feed rate due to deﬂection, and

wherever possible the largest and most robust

tool must be used. This is important for harder

materials. Steel up to 400 HB is the potential

limit for conventional M2 HSS tools.

Above 300 HB, cobalt alloy cutters should be

considered for increased tool life. In softer

grades of material, cobalt alloy cutters may give

increased output by increasing speeds and feed

rates by up to 50%. Tungsten Carbide cutters

permit surface speeds and feed rates up to

twice those for standard cutters.

Material and cuttinG sPeeds

1 2 3 4 5 6 7 8 9 ... 30 31

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Makita HB500 Specifications Page 4

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