Video: Drilling 0.020-Inch Holes In Stainless Steel Aerospace Part
This footage on a small drilling machining also includes machining with full-size tools in the same cycle.
This machining footage from engineering firm Schultz-Creehan includes drilling of holes 0.020 inch in diameter and 0.335 inch deep in a stainless steel part for an aerospace sensor. The work is performed on a small CNC machining center from Cameron Micro Drill Presses. For more information about this application, see the article under “Editor Picks” at right.
The recipe for best results is simple: Start with a rigid machine, add a high pressure through-the-spindle coolant system, then combine these with the right drill geometry plus the right speeds and feeds.
The more common twist drill point geometries often are not the best for the job at hand. By choosing the best point for the material being drilled, it is possible to achieve better tool life, hole geometry, precision, and productivity.
One of the most common methods of tapping in use today on CNC machines is 'rigid tapping' or 'synchronous feed tapping.' A rigid tapping cycle synchronizes the machine spindle rotation and feed to match a specific thread pitch. Since the feed into the hole is synchronized, in theory a solid holder without any tension-compression can be used.