If you have standard movements/motions, the best way to determine your standard working times is to perform a MOST analysis. It is a simple method which determines many of the useless and often overlooked movements involved in an operation as well as full time studies. I would suggest the book by Kjell Zandin titled "MOST Work Measurement Systems". It is somewhat self explanatory and can be learned in a relatively short time. All of the operations that you have listed would be covered in this method. It has worked well for me so far and has helped to highlight wasted movements in our operation. Also, if you are a union shop, often times stopwatches are not allowed, and this method becomes real important. PFD (personal fatigue and delay) are already factored into these numbers so these times are true, noting normal techniques.