The type of box recommended for packing may be a corrugated cardboard box or a wood crate. Corrugated cardboard boxes are characterized by their wall thickness and test strength, which both determine the maximum weight the box can hold. The test strength listed here is the bursting strength ...
When molten material is injected into a mold, voids can occur if certain sections solidify first, caused by a low injection pressure or non-uniform wall thickness. The remaining material will fill these voids as it continues to cool and shrink. This shrinkage causes marks on the part where the ...
The time required to manually change a tool in the spindle or tool changer, which includes the time to stop the spindle, remove the current tool, insert the new tool, and start the spindle again. A manual tool change is performed if the machine does not use an automatic tool changer, as well as for ...
The amount of force required to bend a piece of material into a new permanent shape. The bending force must create enough stress in the material to exceed the yield strength, allowing the material to plastically deform. In bending, the applied force will cause tension on side of the material and ...
The speed of the cutting tool's movement relative to the workpiece as the tool makes a cut. In some operations the tool feeds into the workpiece and in others the workpiece feeds into the tool. The feed rate is measured in inches per minute (IPM) and is the product of the cutting feed (IPR) and the ...
When a bar feeder is used as the fixture, one piece of bar stock is loaded and simply advanced into position before each cycle, rather than loading a new workpiece. The bar load time is the amount of time (in minutes) required to load the bar, which occurs everytime the number of workpieces per bar ...
A turning operation, also known as parting, in which a single-point cut-off tool moves radially, into the side of the workpiece, and continues until the center or inner diameter of the workpiece is reached, thus parting or cutting off a section of the workpiece. A part catcher is often used to ...
A measure of the rate at which heat flows through a material. Thermal diffusivity, typically measured in mm^2/s or in^2/hr, is equal to the thermal conductivity divided by the product of specific heat and density. The thermal diffusivity of most common polymers ranges from 0.09 to 0.14 mm^2/s (0.50 ...
