Do you know what causes restrict the size of parts in the production process
Part size is limited to the machine¡¯s capabilities and depth of cut required by a feature in the part. Keep in mind that a build space¡¯s dimensions don¡¯t equate to part size. For example, a Z travel of 38 inches doesn¡¯t mean that a part can be machined to that depth or height (see below). Depending the on the part size and feature that needs to be machined, the Z height of the part will need to be less than the 38 inches because of tool clearance and depth of cut. The features and size of the part will determine the part¡¯s machinable height.
Lathe capabilities will depend on the build space, or the diameter and length (see below). A company may also offer a live tooling lathe, which dramatically decreases lead times and increases the amount of features that can be machined by combining additional CNC milling functions within the lathe.
Material selection is critical in determining the overall functionality and cost of the part. The designer must define the design¡¯s important material characteristics¡ªhardness, rigidity, chemical resistance, heat treatability, and thermal stability, just to name a few.
The material blank is the size of the material that will be used to create the finished part. For example, if the finished part dimensions are 3.5 in. long ¡Á 2 in. wide ¡Á 1 in. tall, then the material blank size in its raw form would need to be a minimum of 3.75 in. long ¡Á 2.125 in. wide ¡Á 1.125 in. tall. Material blank thickness is another area that should be considered during the design process.
A good rule to follow is to account for a blank that is a minimum of 0.125 in. larger than the part size. For example, if the final dimensions are to be 1 in. ¡Á 1 in. ¡Á 1 in., then the blank for the part would be 1.125 in. ¡Á 1.125 in. ¡Á 1.125 in. to allow for the variations in the raw material. When designing the part, consider if the form, fit, and function of the part would not be changed if the final part dimensions were 0.875 in. ¡Á 0.875 in. ¡Á 0.875 in. This way, a standard 1-in. x 1-in. x 1-in. block could be ordered and save some material cost versus a larger starting blank.
This is the reason why the size of parts is limited in the production and processing process.
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