T/T VS C/T part 1

At previous we have already learn the basic knowledge about TACT TIME and CYCLE TIME.

Now we will discuss further about how to use T/T and C/T  to analyze production line performance

at first , we must have present Cycle Time data of our production line.For example :   Total Cycle time of molding process               C/T  = 25 sec/pc

Time available per day  for example  =  7 hrs per day

Customer order ,for example 2000 pcs/day,  its mean T/T = 12.6 sec/pc

From above data C/T and T/T , what we can conclude about our molding production line ?    base on C/T data above, can we meet customer order ?

The answer is : WE CAN MEET CUSTOMER ORDER 200 pcs product per DAY

Because….. our molding capacity need 25 second to produce 1 piece product. Mean while base on customer order, we must produce 12.6 second for 1 piece product.  it mean, our molding capacity only 50% than customer order.

If we find condition like above sample, we must immediately  take action.  The action plan for example :

we must do improvement in our molding process in order that we can reduce cycle time become same with Tact Time

detail improvement plan will be discussed at next posting


TACT TIME

Tact Time or T/T =
Operation hour per day ÷ Requested quantity per day (Quantity of customer order)

It means “Necessary time for one piece of product makes” for making of quantity of customer’s order in the production period.
Request production quantity per day       =
Total production quantity ÷Production period (day)

Ex.)    Total order quantity                         =   100,560 pcs / month
Production period                                            =    22 days
Request total quantity per day                =   100,560 pcs÷22 days
=    4,570 pcs/day

T/T =
8 h×60 min×60 sec ÷ 4,570 pcs   =  6.3 sec/pc
So, when the one product is made by 6.3 sec, we can deliver of 100,560 pcs of customer’s order in period.
The time of 6.3 sec for making one product is T/T.

CYCLE TIME

C/T=Time until one product is completed.
Cycle time data show how long a process take a time from starting time until finish, its unit is “second/piece”   (sec/pc)
Cycle time usually use as a basic data to calculate process capacity
for example :  if cycle time of process A = 10 second per piece, its mean than in 1 hr that process can produce product with quantity = 3600/10  =  360 pieces product per hr
Below is an image to explain cycle time at simple

?Ex.?
One operator operation
Time that an operator completed one product and returned to the original position is C/T.
Below is an image show how to calculate Cycle Time
on the next posting I will share the method how to take cycle time of the process.