Tim Chambers
was active Not recently activeActivity
-
Tim Chambers replied to the topic Poka Yoke – Wrong Side Operations in the forum Healthcare 20 years, 5 months ago
Here we talk a lot about the two different styles of poke yoke – I don’t know whether there are official terms for them, the indicators – colour coding, shadow boards, tick boxes, and the physically preventative – jigs, pins, barriers etc. Obviously the ‘harder’ solution being physically preventative.
With this X ray idea, surely we should/could…[Read more] -
Tim Chambers replied to the topic Poka Yoke – Wrong Side Operations in the forum General 20 years, 5 months ago
Here we talk a lot about the two different styles of poke yoke – I don’t know whether there are official terms for them, the indicators – colour coding, shadow boards, tick boxes, and the physically preventative – jigs, pins, barriers etc. Obviously the ‘harder’ solution being physically preventative.
With this X ray idea, surely we should/could…[Read more] -
Tim Chambers replied to the topic Negative Sigma in the forum General 20 years, 6 months ago
To be honest – I much prefer the use of Cp & Cpk terms (in conjunction) to describe a process in relation to it’s specification, a completely unambigous method (as long as everyone uses 3 deviations).
I don’t like negative sigma, I prefer conversion of %good (to sepc limits) to sigma level; using +NORSINV() in Excel for example. -
Tim Chambers replied to the topic Negative Sigma in the forum General 20 years, 6 months ago
I don’t agree you can have negative sigma, I don’t agree you can have negative Cp, I do agree you can have negative Cpk.
I think this is all driven by how you calculate sigma levels, if calculated from simple 3 x Cpk values, it is obvious how negatives have been generated (i.e. process average outside spec. limits). If generated from absolute…[Read more]