Classification/Types Of Drilling Machine use In Mechanical Workshop
Types Of Drilling Machine:
1. Portable drilling machine
2. Sensitive drilling machine
3. Upright or column drilling machine
4. Radial drilling machine
5. Gang drilling machine
6. Multi-spindle drilling machine
7. Vertical drilling machine
8. Automatic drilling machine
9. Deep hole drilling machine
Classification of drilling machines.
- These small capacity (Equal Or More Than 0.5 kW) upright (vertical) single spindle drilling machines are mounted (bolted) on rigid table and manually operated using usually small size (φ More than 10 mm) drills. Fig. typically shows one such machine.
2. Pillar drilling machine
- These drilling machines, usually called pillar drills, are quite similar to the table top drilling machines but of little larger size and higher capacity (0.55 – 1.1 kW) and are grouted on the floor (foundation). Here also, the drill-feed and the work table movement are done manually. Fig. typically shows a pillar drill. These low cost drilling machines have tall tubular columns and are generally used for small jobs and light drilling.
3. Column drilling machine
- These box shaped column type drilling machines as shown in Fig. are much more strong, rigid and powerful than the pillar drills. In column drills the feed gear box enables automatic and power feed of the rotating drill at different feed rates as desired. Blanks of various size and shape are rigidly clamped on the bed or table or in the vice fitted on that. Such drilling machines are most widely used and over wide range ( light to heavy) work.
4. Radial drilling machine
- This usually large drilling machine possesses a radial arm which along with the drilling head can swing and move vertically up and down as can be seen in Fig.. The radial, vertical and swing movement of the drilling head enables locating the drill spindle at any point within a very large space required by large and odd shaped jobs. There are some more versatile radial drilling machines where the drill spindle can be additionally swivelled and / or tilted.
5. CNC column drilling machine
- In these versatile and flexibly automatic drilling machine having box column type rigid structure the work table movements and spindle rotation are programmed and accomplished by Computer Numerical Control (CNC). These modern sophisticated drilling machines are suitable for piece or batch production of precision jobs.
(b) General purpose drilling machines with more specific use.
- Unlike the grouted stationary drilling machines, the hand drill is a portable drilling device which is mostly held in hand and used at the locations where holes have to be drilled as shown in Fig. The small and reasonably light hand drills are run by a high speed electric motor. In fire hazardous areas the drill is often rotated by compressed air.
2. Gang drilling machine
- In this almost single purpose and more productive machine a number (2 to 6) of spindles with drills (of same or different size) in a row are made to produce number of holes progressively or simultaneously through the jig. Fig. schematically shows a typical gang drilling machine.
- Turret drilling machines are structurally rigid column type but are more productive like gang drill by having a pentagon or hexagon turret as shown in Fig. The turret bearing a number of drills and similar tools is indexed and moved up and down to perform quickly the desired series of operations progressively. These drilling machines are available with varying degree of automation both fixed and flexible type.
4. Micro (or mini) drilling machine
- This type of tiny drilling machine of height within around 200 mm is placed or clamped on a table, as shown in Fig. and operated manually for drilling small holes of around 1 to 3 mm diameter in small workpieces.
- Very deep holes of L/D ratio 6 to even 30, required for rifle barrels, long spindles, oil holes in shafts, bearings, connecting rods etc, are very difficult to make for slenderness of the drills and difficulties in cutting fluid application and chip removal. Such drilling cannot be done in ordinary drilling machines and b ordinary drills.
- It needs machines like deep hole drilling machine such as gun drilling machines with horizontal axis which are provided with
- high spindle speed
- high rigidity
- tool guide
- Pressurised cutting oil for effective cooling, chip removal and
lubrication at the drill tip.
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