Definition First Time Quality and how First Time Quality is used to determine capacity?

E

elmismojulio1964

#1
What is First Time Quality? and how is first time Quality used to determine capacity?
 
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Stijloor

Staff member
Super Moderator
#2
What is First Time Quality? and how is first time Quality used to determine capacity?
Here is a definition:

First time quality (FTQ): Calculation of the percentage of good parts at the beginning of a production run.

A measure of how well the process performs when you hit the "green button."
Indicative of a well-designed, validated and managed process.

Hope this helps a little.

Stijloor.
 
W

wmarhel

#3
What is First Time Quality? and how is first time Quality used to determine capacity?
Stijloor gave you the definition of "First Time Quality", which you might also see as "First Pass Yield".

As far as using this number to determine capacity, here's an example:

Part A takes one minute to produce.

The First Time Quality for this part is 85% (or it can be said to have a 15% failure rate.

The typical production day is one 8 hour shift = 480 minutes.
Subtract time for two 15 minute breaks gives you an available time of 450 minutes/shift.

Running this part on a single assembly line with a one minute cycle time would result in 450 units being produced per shift.

The First Time Quality of 85% actually produces in only 382 (round down as you can't sell an incomplete unit) being produced per shift.

This level of quality, or lack of quality, amounts to a loss of 68 minutes of available capacity.

Another way to look at this:

Same unit, same one minute of production time per unit.

Customer places an order for 10,000 units.

10,000 units * 1.15 (15% failure rate) = 11,500 units required to complete order

11,500 * 1 minute (cycle time per unit) = 11,500 minutes to complete order

11,500 minutes / 450 minutes per shift = 25.5 shifts required to complete order

Perfect quality requires 22.2 shifts
15% failure rate requires 25.5 shifts.

Wayne
 
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