For example, a new tolerance requirements or their component receives a design change. Some progressive companies are now thinking ahead and combining the need for improved manufacturing results on their existing machines and the purchasing of new machinery in the future. The goal is to create new tooling that will enhance current production. Customers are giving workholding firms the machine model specifications they plan to purchase in the next few years.
This will allow current workholding purchases to be compatible with future machines. These innovations can be totally out-of-the-box, clean sheet designs, but in many cases they evolve from basic concepts driven by specific customer requests. In some cases, customers are integrally involved, bringing their own thoughts and ideas to the design process. For example, many manufacturers are familiar with the concept of a self-centering manual actuation vise that often use v-blocks.
It is traditionally considered an effective way to hold small round parts. The needs or necessities of gear customers have given birth to three different much larger variations on a basis v-block concept. In the first and least complex of the three different self-centering design evolutions, the customer wanted to hold bar stock to begin the production of splined gear shafts See Figure 1. They wanted to face mill and center drill both ends of the stock so they needed to have the bar stock positioned and have both ends available for milling and drilling.
They had a variety of bar stock diameters and lengths. Each size was a medium volume of parts. The customer needed a fixture capable of accommodating varying lengths and diameters with minimal or no change over to work with their horizontal machining center.
This design concept featured a base plate with two v-blocks to center and clamp the bar stock. The two v-blocks can be manually moved to accommodate different part lengths. Bar stock end location was set with a manually activated end stop that would slide up during loading and drop down after the bar was clamped. The clamping v- blocks themselves were hydraulic activated through a hydraulic quick connect. We need a fast and easy way to change over a wide variety short runs of parts.
The diameter requirements here ranged from five inches to 15 inches with lengths up to 96 inches. Run quantities of two to eight pieces. In this version of the concept, Drewco Corporation designed hydraulic power for clamping the v-blocks and also used hydraulics to power the motors for moving the v-blocks to different positions for various length parts.
The whole v-block mechanism was mounted to a base plate which was mounted to the machine table. The large range of diameters was handled with a series of three quick change jaws. Set up sheets where made for each part to be run on this fixture to document the v-block position and the required jaw set. In this third example, this customer wanted to address additional needs.
Drewco was asked to design and build a self-centering fixture for milling keyways in large pinion gears in their new horizontal machining center. This expression dates back to around the year B. It comes from the work Republic , written by the Greek philosopher, Plato. The idea behind it is that having a problem supplies additional creativity to come up with innovative solutions.
The first use in English was in , but it appeared in a slightly different form than we commonly see it today. Tyrese: Yeah, I feel like an idiot. Something that necessitates the immediate implementation of inventions and innovations that save us from extinction. That returns my thought to necessity. We all have needs, all the time, but only the most fundamental need of securing immediate survival seems to inspire this kind of acceleration of innovations into use.
Looking back at the innovation the surgeons had implemented, we can see much more plastic coverings being employed to protect both patient and surgeon from potentially contaminated droplets reaching eyes, mouth and nose. It might have to do with the instant gratification when you tackle a problem immediately in front of you.
Originals of this text are difficult to locate, but it was republished in , with a foreword by Sir Walter Scott. The frontispiece of the reprint states that the original was " writ in the year ". It contains this:. His use of 'mothers' clearly had a ribald meaning that Erasmus wouldn't have approved of but Zappa did at least keep the expression from dropping into 'granny phrase' obscurity.
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