Important Questions and Answers: Shaper, Milling and Gear Cutting Machines

SHAPER, MILLING AND GEAR CUTTING MACHINES

1.Define cutting ratio of the shaper.

The ratio between the cutting stroke time and the return stroke time is called as cutting

ratio.

Cutting stroke time

Cutting ratio m= Return stroke time

2. Mention any four shaper specifications.

1.Maximum stroke length.                                    2.mechanism.

3.Power of the motor.                                           4.Speed and feed available.

3. How the planer differs from a shaper?

Planer- The work piece reciprocates while the tool is Stationary. Shaper – The tool reciprocates while the work Stationary.

4. What is the main difference made in divided table planer?

The working principle is similar to that of a planer. But it has two reciprocating table. In that one table is working with work the other is loaded and unloaded

5. What is gang drilling machine?

More number of single spindle with essential speed and feed are mounted side by side on one base and have common work table, is known as the gang- drilling machine.

6. What is the use of a tapping tool?

A tap is a tool which is used for making internal threads in a machined component.

7. What are the applications of boring?

The boring machine is designed for machining large and heavy work piece in mass production work of engine frame, Cylinder, machine housing etc.

8. What is the main difference between boring bar and boring tool?

Boring bar:

The tool which is having single point cutting edge known as boring bar. Boring tool:

The tool which is having multi point cutting edge known as boring tool.

9. How omniversal milling machine differs from universal milling machines?

This is a modified form of a milling machine It is provided with two spindles, one of which is in the horizontal plane while the other is carried by a universal swiveling head.

10.What are the advantages of up milling processes?

1.It does not require a backlash eliminator.

2.Safer operation due to separating forces between cutter and work.

3.Less wear on feed screw and nut due to the absence of pre loaded.

4.Milled surface does not have built up edge.

11.What is meant by plain or slab milling?

Plain or Lab milling is the operation of producing flat horizontal surface parallel to the axis of the cutter using a plain or slab milling cutter.

1.     What is meant by the term indexing?

Indexing is the process of dividing the periphery of a job in to equal number of divisions.

13.What are the three types dividing heads?

1.Plain or simple dividing head.

2.Universal dividing head.

3.Optical dividing head.

14.What is cam milling?

Cam milling is the operation of producing cams in a milling machine by the use of a universal dividing head and a vertical milling attachment.

15. List the advantages and limitations of thread milling.

Advantages;

1.the threads will be smoother and more accurate than those cut in a lathe. 2.Threads can be cut closer to shoulders of work piece.

3.It is a faster method.

4.It is more efficient than cutting threads in a lathe. Limitations:

1.It is Difficult to produce internal threads.

2.Threads milling cannot be used for making thread with more than 30 helix angle.

16.List the various types of planners?

1.Double housing

2.Open side planer

3.Pit planer

4.Edge planer

5.Divided table planer

17.Name the various parts of a double housing planer?

1.Bed

2.Table

3.Columns 4.Cross rail 5.Tool head