SHOP SOLUTIONS
On the general machining side, National Jet classifies itself somewhere between a high mix/low volume and low mix/high volume shop and typically ships about 100 jobs per month on average. Job lot sizes can range from one to 20,000 pieces, but the job order sweet spot for the shop are those involving lot sizes of 5000–10,000 pieces. It will also take on prototype jobs involving lower lot sizes if there is a strong potential for the work to lead to extended pro- duction orders. According to James (Ben) Odom, general manager at National Jet, the shop’s markets include the textile (man-made fibers), medical, aerospace, automotive, fluid nozzles, and 3D printer industries. The majority of jobs for these customers are proprietary in nature, so the shop has Nondisclosure Agreements (NDAs) with practically all its customers.
Both Odom and Griffith said that the shop often has no clue as to what a part is or does. Customers will simply ask if the shop can drill a specific size hole at a certain depth, and
if National Jet answers in the affirmative, it typically gets the job with no other additional part information provided. The majority of customer parts are stainless steel while
others are titanium, Inconel, tantalum, molybdenum, Hastel- loy, plastics or customer-specific proprietary exotics. In terms of size, parts can range from those over 20" (508-mm) long that require more than 20,000 micro holes—for National Jet that means less than 0.020" (0.51 mm) in diameter—to parts measuring only about 0.020" in diameter with 0.0005" (0.013 mm)-diameter holes.
For about 70% of the parts National Jet manufactures,
micro drilling is the final operation. So if one hole drills over size, the whole part is scrapped after a lot of time and money has been spent. A perfect example of such a part is an extru- sion die for man-made filtration materials fibers. The part has a knife-edge shape that runs its entire 52" (1320-mm) length, and all along the peak/center point of that edge are about 1500 micro holes.
Continued on P74
DID YOU KNOW? INDUSTRIAL OVENS
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AdvancedManufacturing.org | April 2017
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