Inspection Reporting

APM's Colorado machine shop provides a full range of inspection reporting services utilizing CMMs, calipers, micrometers, and more to inspect and assure that machined parts conform to all standards.

Utilizing the latest in CNC inspection and reporting technology, Advanced Precision Machining’s Colorado machine shop in Longmont provides a full range of CMM geometric dimensioning and tolerancing to inspect and ensure that all machined parts conform to specifications and standards.

CMM Geometric Machine

CNC inspection Machine

CNC inspection and reporting machine

CNC inspection and reporting technology

The process used in electroplating is called electrodeposition. It is analogous to a galvanic cell acting in reverse. The part to be plated is the cathode of the circuit. Both components are immersed in a solution called an electrolyte containing one or more dissolved metal salts as well as other ions that permit the flow of electricity. A power supply supplies a direct current to the anode, oxidizing the metal atoms that comprise it and allowing them to dissolve in the solution. At the cathode, the dissolved metal ions in the electrolyte solution are reduced at the interface between the solution and the cathode, such that they “plate out” onto the cathode. The rate at which the anode is dissolved is equal to the rate at which the cathode is plated. In this manner, the ions in the electrolyte bath are continuously replenished by the anode.

Other electroplating processes may use a non-consumable anode such as lead. In these techniques, ions of the metal to be plated must be periodically replenished in the bath as they are drawn out of the solution.

Plating: Hull Cell

The Hull cell is a type of test cell used to qualitatively check the condition of an electroplating bath. It allows for optimization for current density range, optimization of additive concentration, recognition of impurity effects and indication of macro-throwing power capability. The Hull cell replicates the plating bath on a lab scale. It is filled with a sample of the plating solution, an appropriate anode which is connected to a rectifier. The “work” is replaced with a hull cell test panel that will be plated to show the “health” of the bath.

The Hull cell is a trapezoidal container that holds 267 ml of solution. This shape allows one to place the test panel on an angle to the anode. As a result, the deposit is plated at different current densities which can be measured with a hull cell ruler. The solution volume allows for a quantitative optimization of additive concentration: 1 gram addition to 267 mL is equivalent to 0.5 oz/gal in the plating tank.

Turning Operations

Turning: The most basic machining process. A part is rotated while a single-point cutting tool is moved along the axis of rotation.
Hard turning: Similar to rough grinding; a part is has a high hardness rating and must be heated prior to turning.
Facing: Involves moving the cutting tool at right angles to the axis of rotation.
Parting: A process used to create deep grooves which will remove a completed component from its parent stock.
Grooving: Grooves are cut to a specific depth by a form tool.
Boring: The machining of internal cylindrical forms.
Drilling: Used to remove material from the inside of a workpiece.
Threading: Screw heads can be turned using an appropriate cutting tool.

Types of Mills:

  • Knee mill
  • Bed mill
  • Box mill or column mill
  • C-Frame mill
  • Gantry mill

Knee mill or knee-and-column mill refers to any milling machine whose x-y table rides up and down the column on a vertically adjustable knee. This includes Bridgeports.

This refers to any milling machine where the spindle is on a pendant that moves up and down to move the cutter into the work. These are generally more rigid than a knee mill.

Basic hobbyist bench-mounted milling machines that feature a head riding up and down on a column or box way.

These are larger, industrial production mills. They feature a knee and fixed spindle head that is only mobile vertically. They are typically much more powerful than a turret mill, featuring a separate hydraulic motor for integral hydraulic power feeds in all directions, and a twenty to fifty horsepower motor. Backlash eliminators are almost always standard equipment. They use large NMTB 40 or 50 tooling. The tables on C-frame mills are usually 18″ by 68″ or larger, to allow multiple parts to be machined at the same time.

The milling head rides over two rails (often steel tubes) which lie at each side of the work surface.

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