INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

Emergency stop button on MPG missing

Emergency stop button on MPG missing

(OP)
I work for a manufacturer of large double column milling machines.

On one type of machines it is possible to start the spindle in set/safe mode from the operation panel.
The machine can then be entered and operated with the MPG (hand wheel) that is connected to the operation panel via spiral cable that can extent several meters. The MPG allows to initiate axis movements but nothing else.

The spindle can not be stopped (or started) with the MPG. There also is no emergency stop button on the MPG.

Spindle speed and axis feed rate are limited in set / safe mode (30-50rpm / 2m/min).

The problem is my supervisor tells me that the missing E-Stop button on the MPG is not required by the machinery directive. I doubt it, given that an operator could get entangled by the spindle with no means to stop it.

Unfortunately I have no idea where to find the relevant section in the directive. Could someone please point it out to me?

RE: Emergency stop button on MPG missing

Chapter 1.2.4.3. (Emergency stop) of the Machine Directive:
Machinery must be fitted with one or more emergency stop devices to enable actual or impending danger to be averted.
The following exceptions apply:
— machinery in which an emergency stop device would not lessen the risk, either because it would not reduce the stopping time or because it would not enable the special measures required to deal with the risk to be taken,
— portable hand-held and/or hand-guided machinery.
The device must:
— have clearly identifiable, clearly visible and quickly accessible control devices,
— stop the hazardous process as quickly as possible, without creating additional risks,
— where necessary, trigger or permit the triggering of certain safeguard movements
Once active operation of the emergency stop device has ceased following a stop command, that command
must be sustained by engagement of the emergency stop device until that engagement is specifically overridden;
it must not be possible to engage the device without triggering a stop command; it must be possible
to disengage the device only by an appropriate operation, and disengaging the device must not restart the
machinery but only permit restarting.
The emergency stop function must be available and operational at all times, regardless of the operating mode.
Emergency stop devices must be a back-up to other safeguarding measures and not a substitute for them.

Does that answer your question?

RE: Emergency stop button on MPG missing

(OP)
Yes, that was exactly what I was looking for. Thank you!

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close