Comments on: Two Types of Cycle Time = Confusing http://www.leanblog.org/2009/08/two-types-of-cycle-time-confusing/ Mark Graban's leanblog.org - Lean Healthcare, Lean Thinking, Lean Manufacturing, Toyota Production System Fri, 10 Feb 2012 10:01:31 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Bruce Baker http://www.leanblog.org/2009/08/two-types-of-cycle-time-confusing/#comment-5427 Bruce Baker Thu, 27 Aug 2009 16:53:31 +0000 http://leanblog.bigbigdesign.net/2009/08/two-types-of-cycle-time-confusing/#comment-5427 Although I usually blame APICs for eveything bad (just kidding I don't think we should blame either - although I do get frustrated with my inability to help some APICs certicatees see beyond MRP and square roots of lead times, etc.) I usually use the APICs definition listed above as my definition of cycle time and then I compare that to TAKT and try to get cycle time to just below TAKT time. I usually call the time from beginning work on a piece or patient to finishing that piece or patient throughput time or process time. Although I usually blame APICs for eveything bad (just kidding I don't think we should blame either – although I do get frustrated with my inability to help some APICs certicatees see beyond MRP and square roots of lead times, etc.) I usually use the APICs definition listed above as my definition of cycle time and then I compare that to TAKT and try to get cycle time to just below TAKT time. I usually call the time from beginning work on a piece or patient to finishing that piece or patient throughput time or process time.

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]]> By: Mark Graban http://www.leanblog.org/2009/08/two-types-of-cycle-time-confusing/#comment-5424 Mark Graban Wed, 26 Aug 2009 22:03:15 +0000 http://leanblog.bigbigdesign.net/2009/08/two-types-of-cycle-time-confusing/#comment-5424 I prefer using "throughput time" for internal factory elapsed time from start to finish, where I use "lead time" for how long it takes to get something from a supplier (or to a customer) including transportation time.<br /><br />We could do a whole other blog post on how people misuse "takt" to mean production rate instead of demand rate.<br /><br />Maybe "production rate" and "demand rate" are the best terms to use? Except for hospitals, we need a different term than "production"!! I prefer using "throughput time" for internal factory elapsed time from start to finish, where I use "lead time" for how long it takes to get something from a supplier (or to a customer) including transportation time.

We could do a whole other blog post on how people misuse "takt" to mean production rate instead of demand rate.

Maybe "production rate" and "demand rate" are the best terms to use? Except for hospitals, we need a different term than "production"!!

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]]> By: Laura Cibulsky http://www.leanblog.org/2009/08/two-types-of-cycle-time-confusing/#comment-5422 Laura Cibulsky Wed, 26 Aug 2009 18:43:25 +0000 http://leanblog.bigbigdesign.net/2009/08/two-types-of-cycle-time-confusing/#comment-5422 My experience is that we have had to make sure perspective is clear when we talk about "time". When we are discussing takt time we typically use the phrase "rate of demand" or just "demand" indicating customer perspective at the end of the line. <br />When we are talking from the product or service point of view we usually say cycle time (start to end of a single "cycle" usually one processing step). It does get confusing if the perspective is not clear. <br />I believe in Shook's "Learning to See" he uses "lead time" to describe "turnaround time". That term (lead) works for me because I think - "How much time do we need to leave in the schedule to get the material (i.e. patient) through the whole process (appointment)." My experience is that we have had to make sure perspective is clear when we talk about "time". When we are discussing takt time we typically use the phrase "rate of demand" or just "demand" indicating customer perspective at the end of the line.
When we are talking from the product or service point of view we usually say cycle time (start to end of a single "cycle" usually one processing step). It does get confusing if the perspective is not clear.
I believe in Shook's "Learning to See" he uses "lead time" to describe "turnaround time". That term (lead) works for me because I think – "How much time do we need to leave in the schedule to get the material (i.e. patient) through the whole process (appointment)."

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]]> By: Russell http://www.leanblog.org/2009/08/two-types-of-cycle-time-confusing/#comment-5418 Russell Wed, 26 Aug 2009 01:13:58 +0000 http://leanblog.bigbigdesign.net/2009/08/two-types-of-cycle-time-confusing/#comment-5418 A related cadence is Takt time - the rhythm of the process as a whole: http://en.wikipedia.org/wiki/Takt_time A related cadence is Takt time – the rhythm of the process as a whole: http://en.wikipedia.org/wiki/Takt_time

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]]> By: Mark Graban http://www.leanblog.org/2009/08/two-types-of-cycle-time-confusing/#comment-5417 Mark Graban Tue, 25 Aug 2009 18:47:37 +0000 http://leanblog.bigbigdesign.net/2009/08/two-types-of-cycle-time-confusing/#comment-5417 Larry -- even though I don't encourage blaming, I'll blame APICS then, not industrial engineers :-) Larry — even though I don't encourage blaming, I'll blame APICS then, not industrial engineers :-)

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]]> By: Larry Loucka http://www.leanblog.org/2009/08/two-types-of-cycle-time-confusing/#comment-5416 Larry Loucka Tue, 25 Aug 2009 18:24:56 +0000 http://leanblog.bigbigdesign.net/2009/08/two-types-of-cycle-time-confusing/#comment-5416 My first experience with cycle time was when working at a multistage stamping press and marking a section of the metal strip and following it through the successive stages of the deep draw. The time from flat metal strip to finished piece was cycle time. The number of pieces per minute was the "piece rate". But then others will stand at the end of a process and take the time between two successive pieces and call that cycle time.<br /><br />APICS Dictionary defines Cycle Time as: 1) In industrial engineering, the time between completion of two discrete units of production. For example, the cycle time of motors assembled at a rate of 120 per hour would be 30 seconds. 2) In materials management, it refers to the length of time from when material enters a production facility until it exits. Syn: throughput time.<br /><br />Oh well... My first experience with cycle time was when working at a multistage stamping press and marking a section of the metal strip and following it through the successive stages of the deep draw. The time from flat metal strip to finished piece was cycle time. The number of pieces per minute was the "piece rate". But then others will stand at the end of a process and take the time between two successive pieces and call that cycle time.

APICS Dictionary defines Cycle Time as: 1) In industrial engineering, the time between completion of two discrete units of production. For example, the cycle time of motors assembled at a rate of 120 per hour would be 30 seconds. 2) In materials management, it refers to the length of time from when material enters a production facility until it exits. Syn: throughput time.

Oh well…

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