When cleaning parts, there is general cleaning and then there is precision cleaning. Both types are important in medical device manufacturing, but precision cleaning -- repeatable removal of contaminants to a specified, usually validated standard -- has become more prevalent in part because of increasingly stringent Food and Drug Administration oversight of the manufacturing process, resulting in stricter process QC.
I once thought nothing of boring a new set of top jaws. Just remove half a dozen cap screws, take the old jaws out, bolt on fresh jaws, attach a spider or boring ring and crank the hand wheel until the part fits. Setups were long in the 1980s and my boss considered 2 or 3 hours of downtime each day a normal cost of business.
Since the May issue, I have been writing about our combustion shop's migration from batch processing to single-piece flow, or machining one part at a time. Single-piece flow eliminates work in process. This is desirable because WIP hides part defects and increases lead times and inventory levels.
Continuing the theme of the previous three columns, here are additional tips for enhancing the operation of a CNC milling machine from Shop Operations columnist Tom Lipton.
Eliminate part deviations when performing lights-out machining. CAM software with the properly adjusted post-processor for automatically measuring parts on a machine tool.
Representing your company through community involvement accomplishes two goals. Hopefully, you're doing something positive and, in return, raising the reputation of you and your company. You may also gain access to another network of valuable contacts and potential leads.
Spindle bearings support the spindle in the housing and transmit cutting forces to the machine structure. The bearings are intended to hold the spindle accurately in position.