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| Re: R-42's Running On The ''A'' - 7/23/2007 (468091) | |||
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Re: R-42's Running On The ''A'' - 7/23/2007 |
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Posted by Eric B on Sun Jul 29 16:49:15 2007, in response to Re: R-42's Running On The ''A'' - 7/23/2007, posted by SelkirkTMO on Sun Jul 29 10:12:08 2007. OK, so I looked at the other thread, and will have to go over it again. I went back over your explanation, above, and if I'm correct, the whole point of lapping is that the service position continued to build up the air to the maximum, so you had to cut off the buildup (and "hold" what you had) when you had as much as you needed? Of course, the way we do it now is to hold whatever we have by keeping the handle at that same position (like each "degree" is fixed to a particular number of pounds). If that's correct, that is so different from what we have today, even though the whole breake qand controller apparatus looks the same. I wonder why they ever had it like that.Nowadays, we really don't have to ever watch the pressure guage (outside of making sure it is fully charged). We can gather how much brake we need by feel. I guess back then, you were constantly watching the guage. I wonder if that is basically the "unofficial" method we use by moving the handle back and forth within the service range, to get a quicker stop (especially if you have fanned, and are trying to get it back). I heard one guy call it "lapping", IIRC. and it was when I discovered that, that was when I got much better with the 68's, and was able to become completely comfortable with them. Are the NJT cars AMUE also? |
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