rharshberger
Well-Known Member
Part of the delay trimming issue is that delays are variable one lot to the next, NFPA just requires that they fall into a specific range. Below I have posted the requirement. As the requirement states a -10 delay can vary between 8.5s and 11.5s (20% or up to 3s), with that kind of variability a .5s increment is hard to achieve without knowing the exact rate that particular delay composition actually burns at in that motor configuration.Is this aimed at me? At any rate I don't understand this attitude that the process is inaccurate, therefore don't worry about adding even more accuracy. I don't remember what the numbers were, but +/- 2 +/- 2 becomes +/- 4 which is not an acceptable tolerance.
I've removed only .5 second from a delay MANY times and while I can't be sure it helped significantly, it didn't hurt anything (.5 second is basically taking out the "V" of the drill bit tip, almost just a dent). If refined over time, I think working at a higher precision does become significant. Or you stick it in a machine and just trust ...
"The ejection delay must not vary more than 1.5 second or 20% (whichever is greater, up to 3s) from average"