Metal 3D Printing Design Guide

Direct Metal Laser Sintering (DMLS) 3D printing for parts with reduced cost and little waste.

Mechanical Engineers Outlook

Guide for those interested in becoming a mechanical engineer. Includes qualifications, pay, and job duties.

3D Scanners

A white paper to assist in the evaluation of 3D scanning hardware solutions.

Injection Molding Design Guide

Guide for high quality and cost-effective plastic injection molding.

more free publications
Boyle's Law

Boyle's Law, proposed by Robert Boyle in 1662, states that for a closed isothermal (constant temperature) system, the product of the pressure (P) and volume (V) is a constant,

Equivalently, the product at two different states must be the same,

McLeod Gages
Suppose that initial pressure and volume in a McLeod Gage are given by,

P1 = Pi

V1 = V + A·h0

where V is the reservoir volume and A is the cross-sectional area of the sealed tube, as shown schematically below.

Suppose that the final compressed pressure and volume are given by,

P2 = Pgage

V2 = A·h

According to Boyle's law, we have,

For a typical manometer, . The unknown pressure Pi can be reduced to a function of the height difference h,

Furthermore, the volume of the reservoir is usually much larger than the tube,

V » A·(h0-h)

This allows us to drop the area term, resulting in a simple quadratic function for the pressure,

Metal 3D Printing Design Guide

Direct Metal Laser Sintering (DMLS) 3D printing for parts with reduced cost and little waste.

Mechanical Engineers Outlook

Guide for those interested in becoming a mechanical engineer. Includes qualifications, pay, and job duties.

3D Scanners

A white paper to assist in the evaluation of 3D scanning hardware solutions.

Injection Molding Design Guide

Guide for high quality and cost-effective plastic injection molding.