The Importance of Interlocks and Guarding
Chris Heeg 10.23.2019
When installing and servicing machines as part of the Okuma field service team, I must have found over 1,000 machines with missing, damaged or defeated safety interlocks. When I would bring these issues to the operator’s attention, I heard things like, “there are too many safety devices on the machine for me to manage” or “it’s my machine and I’ll use it how I want!”
The problem is that there’s never just one person working on the machine. While some operators may have 30+ years of accident-free experience, safety interlocks and guarding functions can help those with less experience safely operate a machine and avoid any costly mistakes.
The following are three common safety devices you should be checking regularly—and why.
INTERLOCKS
- Operation Door Interlock
This interlock feature ensures the machine’s front door is locked during full-auto operation. Be sure to check that the key is completely straight when the door is opened and closed and that it doesn’t pull the door when it locks. Keeping chips and coolant away from the operation door, along with checking the alignment, will ensure this interlock lasts a long time. - ATC/APC Door Interlock
This interlock will ensure that when the magazine or pallet changer is in use, the door is locked. With this feature, you’ll also need to check that the key is completely straight when the door is opened and closed and that it doesn’t pull the door when it locks. The same rules apply to help it last: keep chips and coolant away from the operation door and consistently check the alignment.
GLASS
- Operator Door Glass
While this may not seem like a safety device, this strong layered glass (similar to a car windshield) serves a vital role in absorbing the energy of small parts or tooling that break during machine operation. The glass should be quickly inspected at the beginning of each shift and replaced every two years whether its damage is noticeable or not. Learn More
COVERS
- Headstock Cover
The headstock cover protects the user from contacting the back of the spindle, spindle motor, and belts. To keep the headstock cover area safe, make sure the cover is properly installed, the label is clear and all the screws are tight. A quick walk around the machine will let you know if everything is done correctly. - Backside Machine Covering
The backside machine covers block access to the saddle and cross slide on lathes and the column on machining centers. A quick walk to check that the cover is properly installed, the label is clear and all the screws are tight is all this cover needs, as well.
Depending on the complexity of your machine, you could see more features than just these five. Always check your specific machine’s safety features. If you need help with replacing any damaged parts or replacing the safety labels, contact your local Okuma distributor for help with part numbers and replacement procedures.
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