What is CNC machine? Write some basic features available in a CNC machine.
With a figure, differentiate between incremental and absolute tool positioning mode. From the issue of error minimizing, which one is more suitable?
Classify NC words and give one example for each of them with their meaning.
Write a part program following Figure 4(d) and the instructions are: i) Starting point is (0,0) and tool is 20 mm above the job surface ii) Machining has to be done along 1-2-3. iii) Z=0 is at the surface of work piece. iv) Depth of groove is 3 mm.
Make a comparison among NC, CNC and DNC machine with neat sketches.
Define part programme. Classify NC words and give one example with their proper meaning.
What is canned cycles? Mention the commonly available canned cycle for lathe operation.
Explain the use of following codes: G00, G01, M02, M03, G90 and G80
What do you mean by NC and DNC machine? Briefly discuss the advantages of employing CNC machines over manual machines.
Explain the absolute coordinate system and incremental coordinate system for a CNC machine. Which one is better for error correction in command writing?
For part programming which instructions should be included in first block? What are the types of NC word? Give one example of each of them using block?
What is part programming? What is G-code? Give 10 example of G-code with their meaning.
What do you mean by point to point and absolute motion control? Which is better for error analysis?
Is there any difference between NC and CNC machine? Discuss the advantages of employing CNC machines over manual machine.
What do you mean by Group Technology? What are the advantages and disadvantages of it?
What is transfer line? Why is it used? Discuss various types of transfer line with figures?
Make a comparison among NC, CNC, and DNC machine with neat sketches.