×
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!
  • Students Click Here

*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.

Students Click Here

Jobs

Machine Uptime, what should I expect?

Machine Uptime, what should I expect?

Machine Uptime, what should I expect?

(OP)
I have been given a project of improving the machine up-time in a sheet metal fabrication plant to 90%, don't all laugh at once! We have some new machines and some old machines, mainly Amada punch presses and press brakes.

What sort of figures has anyone else come up with for this or a similar industry?

Thanks!

RE: Machine Uptime, what should I expect?

Is that so unreasonable?  90% availability still means that any given machine is down 1 day every 10 days.  That's a potentially prohibitive cost to a company.

There are military systems that specified for >98% availability.  Our IT network is required to have availability of around 98% as well.

The key to that is the ability to diagnose the problem quickly and repair quickly.  This might entail having all most plausible spares on-site.  Additionally, this requires your diagnosis tools to provide an answer in less than a few minutes and the ability to perform the repair in less than a few hours, assuming availability of spares.

Availability defined as: MTBF/(MTBF+MTTR+MLDT), where:
MTBF -->  mean time between failures
MTTR -->  mean time to repair
MLDT -->  mean logistical delay time (parts availability)

A high MTBF is obviously desirable, but you can see that MTTR and MLDT can eat your lunch if it's not well controlled.  Let MTBF=600hr, MLDT=5day, MTTR=3hr, Avail=83%.  If MLDT is reduced to 1day, Avail=95%

TTFN

RE: Machine Uptime, what should I expect?

Wakobav,
Make sure you know the definition being used!  Some places want to include set-up time in the 10% while others place it in the 90.  
This is one of those terms that gets used by different disciplines to include different factors.

Griffy

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