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Re: Additional Manufacturing Questions....
Re: Additional Manufacturing Questions.... -- jessecates	Post Reply	Top of thread	Forum

Posted by: David Keith ® 09/18/2007, 13:13:36 Author Profile eMail author Edit

Here is a response to some of your questions. 1) Lets look a typical sheet metal working die. There are vertical leader (guide) pins that are pressed into the lower shoe (bottom plate). They align the top shoe (upper plate) which has bearings that have a running fit to slide onto the pins. 2) Eccentricty is occurs when a work-piece is moved from one piece of equipment to another during its manufacturing. Lets say you turn the outer diameter of a shaft & face the outer end. Then you position this piece in a Bridgeport to drill & ream a hole on center. How close is it positioned using a vise before machining? Plus or minus 0.005 inch? After it is machined, both diameters will not be perfectly centered. 3) The cutting speed is directly tied to the feed rate. The cutting speed is based on how fast the part is turning, rpm, and the diameter of the surface being machined. The feed rate is how for the cutting tool is advancing per revolution of work-piece. Every lathe turned part looks like a threaded rod microscopically. You need to think about the end of your cutting tool. Is there a radius? Is it a sharp corner? 4) What does the area to be chucked on look like. Will a typical three jaw chuck hold it? What about the length of the work-piece, what will be incorporated to assure repeatability when cutting to length? 5) If you use a cutting tool that is the same diameter as the width of keyway groove you want, it will typically cut over size because of tool pressure. You want to use an under-sized tool to rough out most of the stock first, then finish exact size. Gota go.

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