Roy Mech - An Engineering Encyclopedia

Insight into Roymech



Engineer Directives including CE Marking, Machinery Directive, Pressure Equipment Directive, Low Voltage Directive, EMC (Electro Magnetic Compatibility), ATEX, LOLER (Lifting Operations and Lifting Equipment Regulations), CDM (Construction Design and Management), PUWER (The Provision and Use of Work Equipment Regulations), Noise at Work Regulations & COSHH (Control of Substances Hazardous to Health Regulations).

Environmental Standards

ISO 14001 sets out the criteria for an environmental management system and can be certified to. It maps out a framework that a company or organization can follow to set up an effective environmental management system.


Ergonomics is the study of human abilities and characteristics which affect the design of equipment, systems, and jobs. Included in this section we have information about strength, controls, work energy, access space and anthropometrics.


Covers BS EN ISO 9000 and BS EN ISO 9001.

Reliability / Safety

Availability, Reliability, Maintainability (ARM) covers Mean Time To Repair (MTTR),Mean time between failures (MTBF), failure distributions, safety factors to name a few.





Keyways /Splines

Shafts & Fits

Surface Finish



Science / Maths



Online Calculators

Manufacturing Processes

What is an Engineer...?

There are many definitions of what is an engineer, but too many people nowadays claim to be one!

Engineers, as practitioners of engineering, are professionals who invent, design, analyze, build and test machines, complex systems, structures and materials to fulfill functional objectives and requirements while considering the limitations imposed by practicality, regulation, safety and cost.

British school children in the 1950s were brought up with stirring tales of "the Victorian Engineers", chief among whom were Brunel, Stephenson, Telford, and their contemporaries. In the UK, "engineering" has more recently been erroneously styled as an industrial sector consisting of employers and employees loosely termed "engineers" who include tradespeople. However, knowledgeable practitioners reserve the term "engineer" to describe a university-educated professional of ingenuity represented by the Chartered (or Incorporated) Engineer qualifications (although i do not believe that you need a degree to be an Engineer, like my Dad, a Tool Maker, a brilliant Engineer). A large proportion of the UK public incorrectly thinks of "engineers" as skilled tradespeople or even semi-skilled tradespeople with a high school education. Also, many UK skilled and semi-skilled tradespeople falsely style themselves as "engineers". This has created confusion in the eyes of some members of the public in understanding what professional engineers actually do, from fixing car engines, television sets and refrigerators (technicians, handymen) to designing and managing the development of aircraft, spacecraft, power stations, infrastructure and other complex technological systems (engineers).