CNC Programming
- 1. 02/27/16 CNC Nesting & Programming1 CNC Nesting & Programming Guide By Mal Moran This presentation will demonstrate how using various nesting techniques can help improve the efficiencies of a CNC program.
- 2. 02/27/16 CNC Nesting & Programming2 A Nested Pair If a part is shaped then a nested pair should be considered to reduce waste between the parts. The CNC programmer of this program has not produced a nested pair? Note how the increment has not been reduced leaving a gap of 32mm instead of 5mm? Total waste = 27.9%
- 3. 02/27/16 CNC Nesting & Programming3 A Nested Pair By producing a nested pair the waste of this program has been reduced by 9.9%
- 4. 02/27/16 CNC Nesting & Programming4 Comparison Prog Length Width Height No.Prod Waste % Ord Qty M3 VX12811 2065 1926 992 496 27.9 464 3.69 Mal12 2068 1691 992 496 18 464 3.25 9.9 0.45 0.45 Waste reduction = 9.9%
- 5. 02/27/16 CNC Nesting & Programming5 A Nested Pair This is a common way to create a nested pair. Depending on the shape of a part the CNC programmer should always be thinking of the most efficient nest / program. Is this the most efficient nest for this part? Nested waste = 27.5%
- 6. 02/27/16 CNC Nesting & Programming6 NO!
- 7. 02/27/16 CNC Nesting & Programming7 Stagger Nesting Staggering or off setting a nested pair should always be considered to reduce waste when creating a CNC program. Complex shaped parts can require careful attention when creating a program. Nested waste = 12%
- 8. 02/27/16 CNC Nesting & Programming8 Prog Length Width Height No.Prod Waste % Ord Qty M3 VX9953 1823 2196 1000 13944 32.5 574 0.16 Mal4 1936 2092 1000 16932 18.6 574 0.14 13.9 0.03 0.03 VX9953 Mal4 Comparison Waste reduction = 13.9%
- 9. 02/27/16 CNC Nesting & Programming9 Stagger Nesting Comparison Prog Length Width Height No.Prod Waste % Ord Qty M3 VX13306 1591 1726 1000 160 21.3 466 8.00 Mal10 1252 1905 1000 160 9.4 466 6.95 11.9 1.05 1.05 Waste reduction = 11.9%
- 10. 02/27/16 CNC Nesting & Programming10 A Nested Pair Program The CNC programmer of this program has created a nested pair and has reduced the increment to the next nested pair. Is this the most efficient nest? V X 1 3 3 7 4
- 11. 02/27/16 CNC Nesting & Programming11 NO!
- 12. 02/27/16 CNC Nesting & Programming12 Rotate Nesting Rotating a nested pair and reducing the waste between the increment should also be considered when creating a CNC program. The yield from a sheet / block could also improve. M A L 1
- 13. 02/27/16 CNC Nesting & Programming13 Comparison V X 1 3 3 7 4 M A L 1 Prog Length Width Height No.Prod Waste% Ord Qty M3 VX13374 2272 1658 1000 30 48.3 99 12.43 Mal1 2100 1982 1000 40 39.7 99 10.30 8.6 2.13 2.13 Waste reduction = 8.6%
- 14. 02/27/16 CNC Nesting & Programming14 Summary A nested pair can in most cases produce a more efficient program. Consider the scrap between parts and reduce the increment where ever possible. Staggering or rotating the parts could help to further reduce scrap and improve the yield from a sheet or block. Consider the block size / window when creating a CNC program. Try to maximise a window of a block where ever possible.