Which of the following are the advantages of a hydraulic shaper over a mechanically driven shaper?
1. More strokes per minute can be obtained at a given cutting speed
2. The cutting stoke has a definite stopping point
3. It is simpler in construction
4. Cutting speed is constant throughout most of the cutting storke
Select the correct answer using the codes given below
(a) 1 and 2 (b) 1 and 4
(c)2 and 4 (d) 1,3 and 4