Quality Precision Mechanical Components
Precomark represents manufacturers producing a wide range of precision mechanical components including:
Die-casting is similar to permanent mold casting except that the metal is injected into the mold under high pressure resulting in a more uniform part, generally good surface finish and good dimensional accuracy. Dies can be designed to produce complex shapes with a high degree of accuracy resulting in sharply defined parts, with smooth or textured surfaces, suitable for a wide variety of finishes. Post-casting machining can – in many cases - be eliminated, or significantly reduced.
Bearings are engineered, precision-made components that enable machinery to move at extremely high speeds and carry large loads easily and efficiently.
One advantage of Thin Section Bearings over standard section ball bearings is the lower profile/reduced space requirement.
Thin-section bearings offer an additional advantage over standard bearings - in some applications - in that the bearing rings are flexible. Under load, the rings can follow the imperfections of shaft and bores.
The three types of thin-section bearings are deep groove bearings, four-point contact bearings, and angular contact bearings.
Spur gears are the simplest and most common type of gear. The general form of these straight-cut gears is a cylinder or disk with the teeth projecting radially. Spur gears can only mesh correctly if fitted to parallel axles.
The leading edges of the teeth of helical gears are set at an angle allowing the teeth to engage more gradually than do spur gear teeth allowing them to run more smoothly and quietly. Helical gears allow for the use of non-parallel shafts.
Bevel gears are essentially conically shaped and as a result, the angle between the shafts can be anything except zero or 180 degrees.
Bevel gears with equal numbers of teeth and shaft axes at 90 degrees are called miter gears.
Spiral bevel gears have teeth that are curved along their tooth's length and set at an angle.
A worm gear resembles a screw with a large helix angle and, usually, a fairly long body in the axial direction. A worm gear is usually meshed with an ordinary disk-shaped gear. A worm and gear set allow for a high gear ratio in a small space.
In addition to metal machining, powder-metallurgy and plastics are used in the manufacture of gears. Plastic is commonly used where cost or weight is a concern. A properly designed plastic gear can replace steel in many cases. Powder-metallurgy is a cost effective method used to produce simple or complex parts at, or close to, final dimensions by mixing powders and compacting the mixture in a die and heating the resulting shapes in a controlled-atmosphere furnace (sintering) to bond the particles metallurgically.
Machining - CNC Milling and Turning
A secondary process used with aluminum diecasting, MIM and powdered (sintered) metals, Computer Numerical Control (CNC) Mills perform the functions of drilling and turning with great precision and economy. CNC Mills are classified according to the number of axes that they possess.
Metal injection molding (MIM) is a process combining fine metal powders with plastic binders allowing the metal to be injected into a mold using standard plastic injection molding machines. The advantage in metal injection molded parts lies in the complexity and small size of parts possible. In many cases MIM offers a cost effective alternative for difficult to fabricate parts.
Powder metallurgy parts are shaped directly from powders through the P/M process to precisely produce complex (or simple) parts at close tolerances by mixing powders and compacting the mixture in a die and heating the resulting shapes in a controlled-atmosphere furnace (sintering).
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