| Manual layout required to cut the beam or to drill all holes |
Auto measurement is done and cutting and drilling operation is automatic, 70-80 % cycle time can be saved |
| Cutting quality is not satisfactory and one more operation of grinding is required |
Smooth finish is obtained since grinding is avoided and accuracy is achieved upto 0.1mm |
| Since the operation involves manual materials handling for cutting and drilling, the turning of the beams occurs at least 3 to 5 times, leading to chances of handling damages and accidents. |
No material handling is involved since cutting and drilling of holes takes place for all the sides of sections with the beam in one position. |
| Time taken to drill 100 holes of dia 22 mm in one beam of size 500x300x25x15x9000 mm long is approximately 400-420 min with a good fitter and cutter |
Time taken by CNC is approximately 30 minutes |
| Manpower required for material handling is more hence the man-hour spent per hour will be more |
Only two machine operators (For cutting and for drilling machines ) required to perform entire operation and hence less man – hour per ton |
| Chances of human error are more as the drawings have o be referred to on the shop floor |
Since CNC files are downloaded directly from the drawing software, chances of errors are almost negligible |
| Chances of human error are more as the drawings have o be referred to on the shop floor |
Since CNC files are downloaded directly from the drawing software, chances of errors are almost negligible. |
| When percentage of components is high in structures, time taken to prepare is long resulting in delay in fabrication |
When the percentage of components is high, mass production is possible which helps in cutting down the cycle time for fabrication. |
