This site provides advice, reviews, articles, case studies, and information on job shops scheduling and machine shop scheduling. The challenges and problems scheduling in these high mix low volume environments will be discussed along with the best solutions.
Friday, June 2, 2017
FREE Webinar on Job Shop and Machine Shop Scheduling
Theory of Constraints Velocity Scheduling System Webinar
WEBINAR: How to Get More Jobs Done Faster
Each webinar covers exactly how to get MORE Jobs Done Faster. We cover how scheduling is traditionally done and then we cover the Velocity Scheduling System approach. During the webinar you learn what to go do TOMORROW! Sign up here: https://www.velocityschedulingsystem.com/webinar/ WARNING: The Velocity Scheduling System Coaching Program is NOT training. This is a go and do program. Only job shops ready to improve due date performance, cut lead-time through thier shop and who seriously want to reduce chaos should sign up. Velocity Scheduling System is based on Goldratt Theory of Constraints Drum Buffer Rope and is for job shops looking for a better way to schedule their shop.Manufacturing Expert Dr. Lisa Lang Discusses Theory of Constraints in The Fabricator
TOC goes against traditional manufacturing thinking, in which workers produce more than is needed to reduce the number of setups and maximize the efficiency of all resources. The forecast, after all, says these parts will be needed eventually, so why not produce them now? The problem is, of course, that sales forecasts are notoriously inaccurate, so those parts may never be needed. Also, producing so many unneeded parts floods the floor with work-in-process (WIP), while jobs in queue sit for days or weeks waiting for large batches to work their way through.
Dr. Lisa offers her expertise throughout the article, which explores five main topics: “The Value of Throughput,” “The Importance of Flow,” “Drum-Buffer-Rope for High Mix,” “Full Kit and Accurate Information” and “Enabling Change.” The full article can be found here: http://www.thefabricator.com/article/forceos/high-mix-fast-delivery--on-time “Dr. Lisa” Lang is one of the foremost Theory of Constraints experts in the world and a sought after manufacturing expert having been named the 2012 Manufacturing Trendsetter in the USA Today for her inexpensive and guaranteed Velocity Scheduling System Coaching Program that has dramatically improved performance of well over 100 highly custom job shops and machine shops. She has also appeared in CBS News, The Wall Street Journal, Finance.com, About.com, NY Daily News, CNBC, The Boston Globe, The Miami Herald, and others. She is active in helping reshore manufacturing back to the U.S. and in the NTMA, PMA, and AMT communities having helped member companies to reduce their lead-times and improve due date performance. She worked with Dr. Goldratt who is the father of Theory of Constraints and author of the bestselling book, The Goal. Dr Lisa is the President of the Science of Business specializing in increasing profits of highly custom manufacturers by applying Theory of Constraints, Lean and Six Sigma to operations with Velocity Scheduling System and to engineering/design with Project Velocity System and to marketing with her Mafia Offer Boot Camp. Learn more about Dr. Lisa and job shop scheduling at https://www.velocityschedulingsystem.com/ and check out her 47-minute webinar “How To Get More Jobs Done Faster” at www.velocitySchedulingSystem.com/webinar/. ### Contact: Dr Lisa Lang President, Science of Business Inc DrLisa@ScienceofBusiness.com keywords: Dr Lisa Lang, Dr Lisa, Theory of Constraints, Velocity Scheduling System, high mix low volume, drum buffer rope, job shop scheduling, Goldratt Links: http://prlog.org/11996440 http://bit.ly/WSz4zB http://bit.ly/WSA4UlSunday, May 28, 2017
30 Job Shops Improve Scheduling
30 Job Shops Improve Scheduling
By Dr Lisa Lang
In 2009 we significantly improved the scheduling and operations of 30 custom job shops and machine shops. These 30 shops improved due date performance (DDP) to at least 97%, reduced lead-time by 50%, all while improving communication and reducing chaos. Isn't it time for YOU to do the same? Here's an email that I was copied on just yesterday. It's from one of my VSS clients to someone he is recommending the course to:Jose, This is the best system for Manufacturing that I have encountered. This is our next step in the cables shop and covers the entire value stream. It is a web based course that you take 2 hours twice a week for a month and the person walks you through your specific implementation and helps you through the problems. We are currently finishing the training and building the new board. Trust me I have seen and implemented many JIT, Lean Six Sigma systems in the past and this is the best. I have copied Dr. Lisa the creator and facilitator of the program. She is top notch. As well I am attaching one of her free reports on how the system compares with other systems. Sincerely, Luis Fernandez Schlumberger Manufacturing Engineer IPC-Cables
Theory of Constraints Results After 1 Year



SUBJECT: Our One Year Anniversary “Welp it’s Criterion’s one year anniversary with the VSB (Velocity Scheduling System) and WE STILL love it! A few major projects went thru our building: new product launch in Oct- Dec, another new product launch currently under way, reduction of staff thru attrition and increase in work, and in most cases we came thru with flying colors. Attached is our score card. ”Accenture just released a report in conjunction with the United Nations Global Compact called “A New Era of Sustainability.” The most significant finding was that 93% of the approximately 1,000 CEOs surveyed from across the globe indicated they believe sustainability is important to their companies’ future success. So if sustainability is important to you, maybe the Velocity Scheduling System Coaching Program is a good fit. The Velocity Scheduling System that Tanya uses is based on the Theory of Constraints Drum Buffer Rope. There are 1000s of success stories dating back to the 80s. Build -- Capitialize -- Sustain. We agree that sustainability is important. The key is how to achieve it. The answer is simple -- the Velocity Scheduling System Coaching Program.
Thursday, May 25, 2017
Drum Buffer Rope
Theory of Constraints Drum Buffer Rope

The drum is the constraint.
The resource that is limiting your output. Most shops typically only have one constraint at any point in time, but the issue is that for many custom job shops and machine shops the constraint can move as the mix changes. A constraint is any resources that had demand greater than it's available capacity. Any time lost on the constraint is output lost by the entire system. Increasing output at the constraint, increases overall output. Improving non-constraints has no effect on overall output. This is why measuring utilization everywhere makes no sense. Trying to 100% utilize non-constraints just results in too much WIP and the many issue associated with that.The buffer is measured in time.
It's the amount of work expressed in time (like days worth) prior to the constraint. We control this amount of work with the rope. By having a buffer of work in front of the constraint, we can ensure the constraint does not run out of work. The constraint is the only place where 100% utilization is a good thing! The buffer's job is to absorb variability. In traditional Drum Buffer Rope there are 2 buffers - one for the constraint and a shipping buffer. The one before the constraints is there to protect the constraint and the shipping buffer protects the due date. Simplified Drum Buffer Rope just has a shipping buffer. Drum is the same. Any buffers are divided into 3 zones - red, yellow, green. If the buffer is red we find out why. The buffer is sized so that it turns red about 5% of the time. For continuous improvement we track the whys so that we can reduce or eliminate our biggest disruptions to flow. These improvements to flow lead to less variability and needing less buffer!The rope is how we control the release of new work.
The idea is that if the constraint sets the pace, the drum beat, for the entire operation, then we should only release work at the rate that the constraint can consume it. If we release work faster than the constraint can consume it, then WIP (work in process) piles up and bad things begin to happen. (See Little's Law.) That's a brief Theory of Constraints summary of Drum Buffer Rope. The real challenge is figuring out how to make it work in YOUR shop. The plant in The Goal is a machine shop. It's not the most complex of cases, but it is a machine shop.Theory of Constraints Goldratt
Velocity Scheduling System was developed for the tough cases:- For the custom job shops and machine shops that run high mix and low volume work or prototypes.
- For the shops where the constraint or bottleneck moves based on the mix of work.
- For the shops that may not run many jobs twice but can also have a production job to fit in with everything else.
- For the shops that do repairs (in house or on-site) or emergency work.
- For the shops that don't have perfect employee or vendor performance.
- For the shops who don't have perfectly cross trained employees, but have jobs that require a particular machine.
- For the shops that produce a wide range of custom parts or products that have a wide range of lead-times, set-up times and outside processes.
- For the shops that may not have 100% quality performance and or yields that are less than 100%.
- And, for the shops who have customers call and change quantities, dates or both.
This article is copyrighted by Science of Business, Inc.