Machinery Safety 101

Do-It-Yourself Safety Labels, Signs and Tags

Safety label on a roller conveyor
This entry is part 1 of 5 in the series Hier­archy of Con­trols

One of the great chal­lenges that all product design­ers face is the sourcing of appro­pri­ate product safety labels. There are many sources for off-the-shelf labels includ­ing some of the biggest…

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Emergency Stop Pull-Cords

This entry is part 15 of 16 in the series Emer­gency Stop

This art­icle was updated 2020-06-13, adding links to the Rock­well Auto­ma­tion and Schmersal pull-cord data, and on 2019-04-26, adding spe­cif­ic details related to IEC 60947 – 5‑5 [7]. When it comes to…

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5 Things You Need to Know About ANSI

Have you ever wondered about ANSI? Needed to know how ANSI stand­ards are developed? Find your answers and more in this post!

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Are You Ready? WEEE Directive Full Implementation Starts 15-Aug-18

Processing of waste electrical and electronic materials

image: Advanced Recyc­ling Machines Many man­u­fac­tur­ers selling indus­tri­al products into the EU mar­ket have come to under­stand at least one of the envir­on­ment­al pro­tec­tion Dir­ect­ives, RoHS – the “Restric­tion of…

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Trapped Key Interlocking

This is a trapped key interlock on the door of an electrical switchgear cabinet. To open the door the key must be inserted and turned to withdraw a bolt that holds the door closed. With the bolt withdrawn, the key is held in the lock. The upstream switching device is held open by another interlock using the same key; since the key can only be in one of the two locks, it prevents accidentally closing the upstream switch while the cabinet is open for maintenance. The interlock is attached to the door with one-way screws to discourage casual removal of the lock, which would defeat the system.
This entry is part 3 of 7 in the series Guards and Guard­ing

Many machine design­ers think of inter­locks as exclus­ively elec­tric­al devices; a switch is attached to a mov­able mech­an­ic­al guard, and the switch is con­nec­ted to the con­trol sys­tem. Trapped Key Inter­lock­ing is…

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How to Apply a Safety Edge to a Machine Guard – Part 3: Stopping Performance

CNC machine with sliding doors and safety edges
This entry is part 7 of 7 in the series Guards and Guard­ing

In Part 2 of this art­icle, I looked at the pres­sure-sens­it­ive devices (safety edges) them­selves. This part explores the stop­ping per­form­ance require­ments that engin­eers and tech­no­lo­gists need to con­sider when apply­ing these…

RA101 – Introduction to Risk Assessment

Graphic illustration of a factory line

Learn Machinery Risk Assess­ment any­time and any­where.  Intro­duc­tion to Risk Assess­ment is our 12-week machinery risk assess­ment course, based on ISO 12100:2010 and ISO/TR 14121 – 2:2012 stand­ards. Delivered online, this course fea­tures widely…

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How to Apply a Safety Edge to a Machine Guard – Part 2: Design Considerations

CNC machine with sliding doors and safety edges
This entry is part 6 of 7 in the series Guards and Guard­ing

In Part 1 of this art­icle, I looked at the pres­sure-sens­it­ive devices (safety edges) them­selves. This part explores the design require­ments that engin­eers and tech­no­lo­gists need to con­sider when apply­ing these devices.…

How to Apply a Safety Edge to a Machine Guard – Part 1: Pressure-sensitive devices

CNC machine with sliding doors and safety edges
This entry is part 5 of 7 in the series Guards and Guard­ing

Safety Edges are often for­got­ten as safe­guard­ing devices. Most machinery engin­eers and design­ers are famil­i­ar with inter­lock­ing devices and light cur­tains, but once we step away from the famil­i­ar, our…

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Q & A: Category 2 and Testing Intervals

Logical block diagram for ISO 13849-1 Category 2 architecture.
This entry is part 1 of 2 in the series Q&A

Dur­ing the Free Safety Talks that we did with Schmersal Canada and Frank­lin Empire, we had a “hot ques­tion” come up regard­ing Cat­egory 2 archi­tec­ture and the test­ing inter­val require­ment. The…

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