Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
jlow said:...with a range of 0.00025†(SDEV 0.00007â€).
Started to anneal the first group with 0.2 seconds (2.4 seconds) less than the optimal amount of annealing time for the torch setup, the next groups were 2.6 (optimal), 2.8, 3.0, and 3.2 seconds. The last one was long enough to see the necks definitely glow red.
jlow said:As for 5 decimals is beyond the norm for reloading, I hear that all the time but it is not hard to measure to at least 4 decimals (the last one is an average). What is needed is the right tool (expensive Mitutoyo micrometers and tube micrometers both with range down to 0.00005†with accuracy to +/- 0.00015â€) and the right technique[/color]. “ BTW, the capability of the micrometer I quoted is from the manufacturer.
LHSMITH said:jlow said:As for 5 decimals is beyond the norm for reloading, I hear that all the time but it is not hard to measure to at least 4 decimals (the last one is an average). What is needed is the right tool (expensive Mitutoyo micrometers and tube micrometers both with range down to 0.00005†with accuracy to +/- 0.00015â€) and the right technique[/color]. “ BTW, the capability of the micrometer I quoted is from the manufacturer.
Actually it is quite difficult to measure that small. Most people on this forum will have trouble getting consistent readings in the tenths range, and to measure smaller you better be in a controlled environment and use more sophisticated lab equipment AND trained and adept in their use.
If for some reason you feel compelled to take your tension experiment into the lab, feel free. i just want to know what you will do with the necks after firing and the numbers start moving all over the place...re-turn the necks? ..only shoot the brass 1x?
Also, after reading post #30...I have to agree that unless one reads the entire post very carefully, it mentions heating until necks are red TWICE....which we all know is BAD..... but for the new guy just learning annealing and scanning posts while doing a search.......I can see a potential problem.
LHSMITH, you seemed to have that 0.00001 number stuck in your mind.LHSMITH said:My problem is your claim that it is simple for anyone to measure to 0.00001 with the proper micrometer. This is not true. A trained QA inspector in a lab -yes. You make no mention of what tool you are using, nor the procedures...did you do this in a lab with a comparitor?
I don't think it helps forum members who are just getting into the neck-turning/ annealing part of accurate reloading by making it appear harder than really is. And someone just getting the necessary equipment might think he needs a $400 micrometer.
You never addressed my questions from the post above......when your talking THAT small .....you had better address the roundness,( or ovality if you will) of the necks or your data will be compromised. What are you using to measure bullet seating force that is that precise?
By not taking into consideration the bullet tolerance and roundness...your whole exercise is futile IMHO.