Past Preventive Maintenance columns:

LevelingMachining Centers and Mills  
(July 2001)

LevelingIs It an Issue After Installation?  
(June 2001)

Frequently Asked PM Questions  
(May 2001)

Machining Center PMIndex and NC Tables  
(April 2001)

Examining Accuracies on Machining Centers  
(March 2001)

Zero Points on Machining CentersMachining Centers vs. Lathes  
(February 2001)

Completing Lathe MaintenanceTailstock, Sub-Spindle, and Zero-Point Alignment  
(January 2001)

A Closer Look at Spindles and Turrets  
(December 2000)

The Next Level: AccuracyChecking Backlash on Lathes  
(November 2000)

Inspecting the Electrical Cabinet  
(October 2000)

Everyone's Favorite TaskCleaning  
(September 2000)

CoolantThe Most Ignored Fluid in your Machines  
(August 2000)

It's SummertimeIs your Chiller Working?  
(July 2000)

The Other OilsInspecting the Main Hydraulic Systems  
(June 2000)

MIKE BREEN ON PREVENTIVE MAINTENANCE

Remembering Why
It is Important to
Perform PMs

by Michael W. Breen

Michael W. BreenYou know its getting a little rough out there when half of the Sunday comic strips refer to the sagging economy.

I thought this month would be a good time to step back and remember why we are doing this PM thing. With the economy the way it is, there is not a better time than right now to take care of what you have.

I know that when the corporate purse strings get tight, corners start to get trimmed a little bit. The good news is: most forecasters are starting to see light at the end of the tunnel. But, in the meantime, take advantage of the situation and perform those important PMs on your machines.

Self-PM

Before we move on to your machines, start by doing a quick self-PM. Ask yourself these important questions: Are you doing the best you can? Are you looking at ways to cut costs? Are you showing up to work, ready to work? The answer to all of these questions should be “YES”, because getting America back on its feet is up to the workforce of America. (I know most of you are envisioning me in a skirt and holding pompoms in my hands right now, but it really is up to US.)

Reduce Downtime

So, why is PM so important, especially in a down market? That is a simple one. PMs stop unscheduled downtime. Unscheduled downtime adds to the cost of the part. If the part costs too much to manufacture, the company starts to lose money on the production of that part. The company then needs to increase the price of the part, which may force the customer to find someone else to produce the part cheaper. With times being a little tight, customers are being forced to continuously search for better deals.

Believe it or not, there is an advantage to a slowdown in production. Number one, machines become available so that you can work on them. When you get your hands on one of these untouchable machines, be thorough, because you may not have the opportunity to work on this machine again for a long time. With more time to work on each machine, you can get much deeper into the PM process. Be smart about the parts you want to replace. If a replacement part is needed, but the part purchase is denied, take the manager out to the machine and demonstrate what will happen if the part is not replaced.

PM Saves Money

Conducting preventive maintenance checks saves money. With added time to work with, here are some money-saving PM tips:

  • Nothing saves more money than aligning your machines. The tooling (mills, drills, and inserts) is very costly, and alignments greatly increase tool life.
  • Check your chip hoppers. Are they full of coolant? Install a timer on the contactor so the coolant will have time to drain back into your machine by adjusting on and off times controlling conveyor movement. Also, do not throw chips into garbage cans: recycle them.
  • Knock out the oil leaks. Oil is expensive and costly to clean up. Make sure your way lube timers are adjusted properly. If these are set too low, your machine will go through oil too quickly. Excess oil normally gets into the coolant, which ruins tool life. To prevent this, I advise that all machines should have a skimmer or an oil belt to remove oils from the coolant.

Do what you can out there NOW to save a little bit, and performing PMs is one way to do this. The future is starting to look better. In the meantime, keep your chin up and communicate your ideas. It may be your idea that saves your company. Next month we are going to start talking about grinders. Talk to you then; meanwhile, get going on those PMs.


Mike Breen’s career of more than 14 years in machine tool repair includes his experience as an aircraft electrician in the U.S. Army’s 101st Airborne. He is a Certified Electronic engineer, presently working as a Field Service Engineer with Ellison Machinery Company of Wisconsin. Mike invites you to share your own machine repair and maintenance experiences with him. For comments and inquiries about these articles, his e-mail address is mbreen@ellisonwi.com.

- August 2001