Wilton 2221VS manual Operating Precautions, Feeds for Drilling

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Operating Precautions

The following operating and safety precautions must be observed in order to avoid harm to the operator or damage to the drill press.

1.The head assembly must be locked to the column so the thrust produced by drilling will not force the head assembly up the column.

2.The work table must be locked to the column so it will not be forced down the column.

3.Before drilling, release the quill lock nut to permit free travel of the quill.

4.Be sure the belt is tightened to the proper tension.

5.DO NOT start to drill the workpiece until making certain the workpiece is held down securely.

6.MAKE SURE THE DRIVE MOTOR IS RUN- NING BEFORE turning the speed control handwheel in either direction.

7.Point of operation protection is required for maximum safety. This remains the responsibil- ity of the user/purchaser since conditions differ between jobs.

8.Make sure the drill is secured in the spindle or check before attempting to use the drill press.

9.Make sure the spindle taper is clean and free of burrs, scoring, and galling to assure maximum gripping.

10.Lock the quill in position when using and side- loaded tool.

Drilling Recommendations

Speeds for Drilling

The speed of a drill is usually measured in terms of the rate at which the outer periphery of the tool moves in relation to the work being drilled. The common term for this is Surface Feet per Minute (SFM). The relationship of SFM is expressed in the following formulas:

SFM = 0.26 X rpm X Drill Diameter (in inches) RPM = 3.8 x ________SFM__________

Drill diameter (in inches)

In general, the higher the speed the shorter the drill life. Operating at the low end of the speed range for a particular material will result in longer life. The most efficient speed for operating a drill depends on many variables:

1.Composition and hardness of material.

2.Depth of the hole.

3.Efficiency of the cutting fluid.

4.Type and condition of the drilling machine.

5.Desired quality of the hole.

6.Difficulty of set-up.

Feeds for Drilling

The feed of a drill is governed by the size of the tool and the material drilled. Because the feed rate partially determines the rate of production and also is a factor in tool life, it should be chosen carefully for each job. In general, the most effective feeds will be found in the following ranges:

Diameter of Drill

Feed per Revolution

(inches)

(inches)

Under 1/8

0.001 to 0.002

1/8 to 1/4

0.002 to 0.004

1/4 to 1/2

0.004 to 0.007

1/2 to 5/8

0.007 to 0.015

Indication of Extreme Speeds and Feeds

A drill that splits up the web is evidence of too much feed or insufficient tip clearance at the center as a result of improper grinding. The rapid wearing away of the extreme outer corners of the cutting edges indicates that the speed is too high. A drill chipping or braking out at the cutting edges indicates that either the feed is too heavy or the drill has been ground with too much tip clearance.

Speeds for High Speed Steel Drills

Speed

 

Material

In SFPM

Alloy Steel — 300 to 400 Brinell

20 - 30

Stainless Steel

30 - 40

Automotive Steel Forgings

40 - 50

Tool Steel, 1.2C

50 - 60

Steel, .4C to .5C

70 - 80

Mild Machinery Steel, .2C to .3C

80 - 110

Hard Chilled Cast Iron

30 - 40

Medium Hard Cast Iron

70

- 100

Soft Cast Iron

100

- 150

Malleable Iron

80 - 90

High Nickel Steel or Monel

40 - 50

High Tensile Bronze

70 -150

Ordinary Brass and Bronze

200

- 300

Aluminum and its Alloys

200

- 300

Magnesium and its Alloys

250

- 400

Slate, Marble, and Stone

15 -25

Plastics and similar material (Bakelite)

100

- 150

Wood

300 -400

Titanium Alloys

10 - 25

Titanium Alloy Sheet

50 - 60

In cases where carbon steel drills are applicable, the drill should be run at speeds of from 40 to 50 percent of those given above.

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Contents Inch VS Drill Press Models 2221VS, 2223VS, 2232AC, 2234ACPage Table of Contents General Specifications SpecificationsMachinery general safety warnings When setting up machineWhen using machine When servicing machineSafety Instructions for Drill Presses Wire sizesGeneral electrical cautions Introduction Operation and Set-upSecuring the Base Raising the Drill Head and Table Electrical ConnectionOperating Controls Manual Speed Control Models 2221VS and 2223VS See FigureDepth Indicator Inverter Speed Control Models 2232AC and 2234AC See FigureMaintenance Replacement of Drive BeltReplacement of Motor LubricationMachine Adjustments Head AdjustmentTable Adjustment See Figure Radial Adjustment of Head All ModelsOperating Precautions Feeds for DrillingWiring Diagram Models 2221 Wiring Diagram Models 2232AC & 2234AC Troubleshooting Coolant System Installation Optional EquipmentReplacement Parts WMH Tool GroupPage Parts Listing Drill Head Manual Speed Control Part Number Description QtyPage Part Number Description Qty 5513683 Screw, Cap Exploded View Spindle Components All Models Parts Listing Spindle Components All Models Exploded View Table and Base All Models Parts List Table and Base All Models Page Vantage Drive Elgin, IL Phone