Overall Equipment Efficiency and Your Precision Machining Shop

August 21, 2017

Overall Equipment Efficiency

“What are you going to work on in your shop today?”

Busy machines and production lines are good, but even better are busy machines and production lines that are making the right product- and the product right. This is one perspective on OEE- Overall Equipment Efficiency.

What is OEE?

Availability, Performance, and Quality. As a percentage of your equipment’s ideal values, each of these factors plays a role in determining your shop’s OEE. When I looked at OEE for my plant, I found that we were definitely not getting the productivity that our equipment was capable of achieving.  Here are three equations to help you determine your OEE:

Availability

Availability in my shop had two components: Running time (time the machines were actually producing product) and Scheduled Time. Availability (A) is the ratio of Running Time to Scheduled Time.

A= RT/ST

Compare this availability factor to total operating time, and identify the differences- idle time due to operator coffee, smoke, and meal breaks; Setups and changeovers; Breakdowns and mechanical issues; Delays waiting for first piece approval, gaging setups, or crane availability. Once these are identified, prioritize them for improvement. (Some practitioners simplify this to Scheduled time divided by the product of 365 days times 24 hours per day; while this is strictly speaking correct, it typically does not reflect the real world utilization for small contract manufacturing shops like ours.)

Break times affect Availability

Performance

Performance is the ratio of the time the machine is actually running and the theoretical time. The difference between theoretical and actual is the time lost due to tool changes, raking out chip bird’s nests, emptying the chips, loading new barstock, or slowing the machine down due to perceived technical issues. Performance is the ratio of Output Achieved divided by the Theoretical Output (TO).

P=OA/TO

This is often a factor that is more often identified when comparing two shifts or operators on the same process. Also can be affected by changes in tooling or methods from the initial quote. (Sometimes it is easier to figure this using parts produced  (OA) versus Theoretical parts produced using the quoted cycle time (TO))

Process performance affects output…and actual uptime.

Quality

Production foremen might think that machining is about making the production numbers, but shops that remain in business know that it is making  parts with the quality needed that keeps the parts shipped and the invoices paid. Quality was simply the ratio of Good Parts (GP) divided by the Total Parts (TP) produced.

Q=GP/TP

These are also a factor in your shop’s OEE.

Overall Equipment Efficiency

OEE is now determined by multiplying A, our availability term; P, our productivity term; and Q, our quality term. What if you are at 90% for each of these terms?

OEE= 0.90 X 0.90 X 0.90 = 0.729 or 73%

What does a 1% improvement in each of these do for you?

 OEE= 0.91 X 0.91 X 0.91 = .754 or 75.4 %

What does 100% Quality (Zero defects) get you with the other two factors at 0.90?

OEE= 0.90 X 0.90 X 1.00 = 0.81 or 81%

So what are you going to work on today in your shop?

 

Accountant photo: accountant.

Break photo courtesy Wikipedia commons

Reject tag photo courtesy Linton Labels


Finally, a Blog on Additive in Precision Machining

August 8, 2017

Excitement!

I’ll admit it, I’ve been a bit of a curmudgeon regarding Additive Technology in manufacturing. While everyone in the trade press seems to be gushing breathlessly about additive technology like a bunch of tweens waiting for their first One Direction concert, I’ve stayed away.

I’ve stayed away, because until now, most things that I saw were mere novelty applications. Distractions, or lets face it, quite impractical. Who needs a 3-d printed plastic wrench?

A very nice project but not really a useable tool in most situations.

 

What have been some of my objections?

  • No  practical mechanical properties. Or else requiring a very expensive thermal treatment to develop mechanical properties that are still below those of traditionally wrought products.
  • Low density. Or higher density achieved by absorbing a molten metal at high temperatures like a wick.
  • Cycle time. building a part a thousandth of an inch or so per pass takes a long time. Even watching the laser pulses  as it builds up features, layer by layer gets old after a few passes.
  • Tolerances. Newer technologies are getting more precise, but  the tolerances  claimed haven’t exactly been  “hold my beer watch this!” impressive.

So what has changed my thinking about Additive in our Subtractive precision machining world?

NanoSteel BLDR Metal for Powderjet Fusion

  • Mechanical properties objection- With case-hardening steel powder that provides high hardness and ductility (case hardness >70HRC, 10%+ core elongation)  that objection is gone.
  • Low density objection- If it is dense enough to perform as roll threading dies, that objection is also moot.
  • Cycle time. Well, the video doesn’t say how long it took to fabricate these thread roll dies, but my guess is it probably took less time than the time to find, purchase, ship and deliver the tool steel needed to fabricate new ones by traditional machining methods.
  • Tolerances. Now, they don’t share the tolerances achieved in this video, but it seems pretty clear that their claim of making tooling capable of fabricating the bolt shown is credible.

So there you have it.  A credible role for Additive in our Subtractive precision machining shops.

I’m impressed. So impressed, I wrote this post.

Now where do I find tickets for One Direction???

NanoSteel.

Excitement Photo     Courtesy Mama Bird Diaries.

Instructables Plastic Wrench 3-d Printing

 


July 2017 ISM-PMI Solid Report Despite Slight Softening From June

August 1, 2017

 “The July PMI® registered 56.3 percent, a decrease of 1.5 percentage points from the June reading of 57.8 percent.”- Timothy R. Fiore, CPSM, C.P.M., Chair of the Institute for Supply Management® (ISM®) Manufacturing Business Survey Committee:

Manufacturing grew somewhat less in July than in the prior month.

Indexes for Inventories and Prices increased, while indexes for New Orders, Production, Employment and Supplier Deliveries decreased somewhat.  Manufacturing industries that we serve or are a part of, including Electrical Equipment, Appliances & Components;  Fabricated Metal Products; Machinery; Computer & Electronic Products; Miscellaneous Manufacturing; Primary Metals; and Transportation Equipment all reported growth in July.

PMPA’s Business Trends Report has been positive about prospects for manufacturing all year, and this ISM PMI report supports that thinking. June 2017 PMPA Business Trends

Link to ISM PMI release 

Link to Calculated Risk Blog 


June 2017 Business Trends Report- Strong Sales of Precision Machined Products

July 26, 2017

“With 79 companies responding, the PMPA Business Trends Index for June 2017 increased 5 points or 3.8% from
May’s 130 to 135. This is the strongest level of shipments that we have seen in June, prior highs for June were 128 in 2015
and 2016.  We continue to be optimistic for a strong performance for the industry for the balance of the year.”

This is what very strong shipments look like. 158 Kg man pulls 30 ton C-130 Aircraft.

The FED’s Industrial Production (IP) Index rose 0.4 percent in June for its fifth consecutive monthly increase.
Manufacturing output rose at an annual rate of 1.4 percent, a slightly slower increase than in the first quarter.

At 105.2 percent of its 2012 average, total industrial production in June was 2.0 percent above its  year-earlier level.

The strength of our PMPA Business Trends Sales Index compared to that of the FED IP Indicator suggests that Industrial Production will continue to rise as companies use the products that we have shipped in excess of the IP demand in June.

We remain positive for industry prospects, and note that our Sales Index is up almost 10% over last year’s full year average.

PMPA members can find the PMPA Business Trends Report HERE.

Photo  Credit

Photo backstory


Strong ISM PMI Report for June 2017

July 3, 2017

A strong ISM Report for June: The PMI Index increased 2.9 percent,  New Orders Index up 4 percent, Production Index up 5.3 percent, and the Employment Index was up 3.7 percent over May. 

Manufacturing in June went something like this.

Timothy R. Fiore, Chairman of ISM Manufacturing Business Survey Committee released this statement:

 “The June PMI® registered 57.8 percent, an increase of 2.9 percentage points from the May reading of 54.9 percent. The New Orders Index registered 63.5 percent, an increase of 4 percentage points from the May reading of 59.5 percent. The Production Index registered 62.4 percent, a 5.3 percentage point increase compared to the May reading of 57.1 percent. The Employment Index registered 57.2 percent, an increase of 3.7 percentage points from the May reading of 53.5 percent… Comments from the panel generally reflect expanding business conditions; with new orders, production, employment, backlog and exports all growing in June compared to May and with supplier deliveries and inventories struggling to keep up with the production pace.”

The consensus for the ISM PMI was to be up slightly at 55.1; the 57.8 actual index strongly outperformed analyst expectations.

That out-performance also aligned with the sentiment indicators from PMPA’s own Business Trends Report from May which had 82% of respondents expecting sales of precision machined products  to remain level or increase…

Here is the long term  ISM PMI graph courtesy of the Calculated Risk Blog

“Economic activity in the manufacturing sector expanded in June, and the overall economy grew for the 97th consecutive month.”- ISM

We continue to remain optimistic about career opportunities in Precision Machining. The ISM numbers showed employment growth up 3.7% for manufacturing in June.

Strong Athlete Lifting Photo courtesy The Athlete Daily.

ISM Data 

Calculated Risk Blog


OSHA Finally Clarifies Online Injury and Illness Reporting Rule

June 30, 2017

 

“The U.S. Department of Labor’s Occupational Safety and Health Administration today proposed a delay in the electronic reporting compliance date of the rule, Improve Tracking of Workplace Injuries and Illnesses, from July 1, 2017, to Dec. 1, 2017. The proposed delay will allow OSHA an opportunity to further review and consider the rule.

The agency published the final rule on May 12, 2016, and has determined that a further delay of the compliance date is appropriate for the purpose of additional review into questions of law and policy.  The delay will also allow OSHA to provide employers the same four-month window for submitting data that the original rule would have provided.“- OSHA NEWS RELEASE

PMPA noticed an unannounced posting on the OSHA website which we captured and shared with our members May 31:

On June 27, OSHA issued a news release quoted above.

While it took OSHA 27 days to issue a news release AFTER we noticed their website posting, they are offering the public only until July 13, 2017 to provide comments.

Here are some bullet points from our testimony back on January 9, 2014:

  • OSHA has not provided any reasons to show how making this previously confidential information public will advance worker safety;
  • OSHA has shown no public purpose to justify the increase in the reporting frequency to quarterly;
  • The creation of quarterly reporting merely provides OSHA with another means to find employers to be not in compliance with yet another paperwork requirement;
  • The proposal removes the presumption of privacy rights from the employer and employees whose data and information would be reported;
  • We disagree with the presumption of this proposal that data shared for statistical and regulatory purposes should be broadly disseminated and made publiclly available to third parties who have no regulatory need for that data;
  • Employers are mandated by the federal government to protect the privacy of health related information of employees in our records, yet OSHA will use this rule to publicize to the world the injury or illness status of our employees;
  • But most seriously, the way that this proposal has been explained places the credibility of OSHA on the line: telling employers that“The proposal does not add any new requirement to keep records, it only modifies an employer’s obligation to transmit these records to OSHA”  is disingenuous at best when the proposal in fact removes the privacy of the employers’ data and changes its status from confidential to publically accessible. Telling us that ‘nothing has changed,’ when in fact the agency’s intent is to remove privacy status of employer reported information and publish those details online is not telling the whole truth.

We’ll be reiterating these and some additional points in our comments, but by all means, feel free to weigh in on your own.

Try this link Injury and Illness Comments

Is public shaming of employers is the REAL agenda, or is it just about using the power of regulatory agencies to bully? What is the regulatory need for public online posting? No one will be any safer because these records are posted on the internet.

Department of Employer Shaming


May 2017 ISM PMI- About The Same, And That’s OK

June 5, 2017

Despite our addiction to ever changing news-cycle dramatic headlines, the increase of just  a skosh (0.1 percentage point from April’s 54.8 percent to 54.9 percent) signifies that manufacturing is still expanding- albeit very slowly. At 54.9 percent, the ISM PMI Index remains strongly above 50 percent, indicating that the manufacturing economy is generally expanding.

Up just a skosh, and we’re fine with that!

 

According to Timothy R. Fiore, Chair of the ISM Manufacturing Business Survey Committee, the New Orders Index also increased 2 percent while Production Index declined 1.5 percent. Fabricated Metals was one of the 15 manufacturing industries that reported growth in May.

 

 

A solid report for manufacturing.

Our April PMPA Business Trends Index showed us that 2017 will be a strong year for our industry. This latest ISM PMI report is one more piece of evidence that supports that. Here is what Fiore had to say,“The past relationship between the PMI® and the overall economy indicates that the average PMI® for January through May (56.1 percent) corresponds to a 4.0 percent increase in real gross domestic product (GDP) on an annualized basis. In addition, if the PMI® for May (54.9 percent) is annualized, it corresponds to a 3.7 percent increase in real GDP annually.”

Precision machined products are crucial enablers of today’s technologies. the increase in GDP indicated by this latest ISM PMI report argues for an equivalent increase in the precision machined products  our shops manufacture for the same period.

We hope that you are managing your shop for success. Our savvy shops are.

 

ISM PMI Report May 2017

Graph Courtesy Calculated Risk Blog

PMPA April 2017 Business Trends Report

Skosh