Takt Time Calculation for Long Runner Product

O

orion1

Hello,

I have question regarding takt time calculation for long runner product.

I want to calculate the takt time for specific product A that makes 60 % of entire products in terms of production units.

Takt time = Available time (Product A) / Customer Demand (Product A).

Total available time per shift = 480 min - 30 min per break= 450 min.

The question is what available time should be taken for calculation of takt time of product A?

Thank you

Orion
 
L

lokeky1

Re: Takt time calculation

"Available time" depends on "Customer demand". If customer demand is calculated as units /week , then available time is 450 mins x 5 days = 2250 mins.

It is the same calculation if the demand is units/day etc...

If there are two machines or production lines running the same product simultaneously, then the available time is 4500 mins.

Regards,

Loke
 
O

orion1

Re: Takt time calculation

Lokeg,

Thank you for the answer.

In our production we have many products and in each department there are app. 4 change overs on the shiftly basis per each machine.

So that means that available time for specific products in not 100 % of total available time per shift. It should be less . If the product A makes 60 % of entire production, availble time should be app. 60 % of total available time or I am wrong?

I am creating VSM , and I can solve this point to continue.

Orion
 
L

lokeky1

Hi Orion1,

If the product is consistently using up 60% of the available time, then yes you are correct. The available time is 60% of the total.

In most of the cases that I have come across, the production lines run multiple products at different volume and it was always difficult to pin point how many % utilization by a product.

The way to overcome this is to go by Product Family. A product is used to represent a family of products that goes through similar processes. In this way, we assume machine utilization is 100% of available time.

Back to your case, whether to use 60% or 100%, you need to look at the other products. If they are in the same family, then use the total available time.

Good question. I like to know what others think too.

Loke
 

Chennaiite

Never-say-die
Trusted Information Resource
Yes, wherever multiple products are manufactured in the same line/machine, it is influenced by the number of changeovers in the line and the time taken for each changeover. Remember you might need tentative forecast volume of all these products to arrive that those changeover figures. Besides, Available time also depends on,
- Breakdown data
- Machine/line efficiency. A 5 minute process will not necessarily produce 12 parts upon continuous production for one hour
- Rejection data
- Also, does your line stop for Lunch/tea break? What about that.
 
O

orion1

Hi Orion1,

If the product is consistently using up 60% of the available time, then yes you are correct. The available time is 60% of the total.

In most of the cases that I have come across, the production lines run multiple products at different volume and it was always difficult to pin point how many % utilization by a product.

The way to overcome this is to go by Product Family. A product is used to represent a family of products that goes through similar processes. In this way, we assume machine utilization is 100% of available time.

Back to your case, whether to use 60% or 100%, you need to look at the other products. If they are in the same family, then use the total available time.

Good question. I like to know what others think too.

Loke
Loke,

Yes I already made Process/ Product family which makes 60 % of entire production volume.
I am glad I was right, however on the forums generaly nobody stress this very important fact to be considered when takt time is calculated for specific product family.

If any else have anything to add , I would like to get info.

Thank you all for the help.

BR

Orion
 
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