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Weighing bullets - process control (Read 47204 times)

Cat_Whisperer Frequent Elocutionist Offline No 1, 9.3x74R Posts: 3878 Location: Mountains of Virginia Joined: Apr 17^th, 2004	Re: Weighing bullets - process control Reply #105 - Dec 12^th, 2013 at 12:26pm	Print Post
	CaryT wrote on Dec 12^th, 2013 at 11:26am: I wonder if you get into the upper end of the measuring range for this unit, i.e. 520 - 600gr if you will still get the same accuracy? It seems sometimes when you get to the extremes on digital measuring devices accuracy suffers, especially on less expensive models. Cary Worth a quick study/test. KNOWING what the variation is (and how big it is) is an easy test. As SSS has mentioned - the measurement to next measurement consistancy is the important thing.

	Cat Whisperer (trk) Chief of Smoke Pulaski Coehorn Works and Skunk Works Drafted May 1970, Retired Maj. U.S.Army assra #9885
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CaryT Full Member Offline Posts: 185 Location: Yelm, WA Joined: Sep 28^th, 2012	Re: Weighing bullets - process control Reply #106 - Dec 12^th, 2013 at 7:51pm	Print Post
	I understand on the 25-20. I will be awaiting those results. Good Luck Cary


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Cat_Whisperer Frequent Elocutionist Offline No 1, 9.3x74R Posts: 3878 Location: Mountains of Virginia Joined: Apr 17^th, 2004	Re: Weighing bullets - process control Reply #107 - Dec 12^th, 2013 at 8:34pm	Print Post
	This is NOT a full gauge reliability and repeatability test. (that would be more like a minimum of 5 samples weighed a bunch of times by several operators) THis is a SIMPLE comparison of the two digital scales I own, set up side by side. One scale is black, the other is white; one reads to 2 decimal places the other to 1 decimal place. All measurements were made first on the black then on the white. Numbers recorded in sequence as measured.

	Cat Whisperer (trk) Chief of Smoke Pulaski Coehorn Works and Skunk Works Drafted May 1970, Retired Maj. U.S.Army assra #9885
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Cat_Whisperer Frequent Elocutionist Offline No 1, 9.3x74R Posts: 3878 Location: Mountains of Virginia Joined: Apr 17^th, 2004	Re: Weighing bullets - process control Reply #108 - Dec 12^th, 2013 at 8:37pm	Print Post
	First glance says one scale will read within +/- 0.06 grains and the other within a 1/4 of a grain. Many more readings would be needed for a GOOD statistical comparison. This is good enough now. Because I know now the scale reading to 0.01 grain resolution does not have 0.01gr accuracy.

	Cat Whisperer (trk) Chief of Smoke Pulaski Coehorn Works and Skunk Works Drafted May 1970, Retired Maj. U.S.Army assra #9885
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SSShooter Frequent Elocutionist Offline Posts: 2917 Location: Southern NJ Joined: Aug 1^st, 2010	Re: Weighing bullets - process control Reply #109 - Dec 13^th, 2013 at 8:00am	Print Post
	Have found with the two digital scales I've used recently that the recommended 30 minute warm-up is a good thing. Readings vary until the scales have fully stabilized. Am guessing at the prices these cost, there is no temperature stabilization circuitry in them. Patience is a virtue (at least 30 minutes worth).

	Glenn - 2x CPA 44 1/2 w/22LR (Shilen ratchet-rifled & Bartlein 5R rifled), 38-40RH & 38-55WCF (Bartlein 5R rifled) & 40-65WCF (GrnMtn 'X') barrels
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Lefty38-55 Senior Forum Member Offline Posts: 366 Location: New England Joined: Sep 11^th, 2013	Re: Weighing bullets - process control Reply #110 - Dec 16^th, 2013 at 8:51am	Print Post
	SSShooter wrote on Dec 13^th, 2013 at 8:00am: Have found with the two digital scales I've used recently that the recommended 30 minute warm-up is a good thing. Of most I've seen or used, the instructions warn to that effect and even air currents you may not feel, i.e., a close door opening or closing.

	All of my single shots shoot one tiny ragged hole with cast bullets ... it's just the following shots that tend to open up my groups ...
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Cat_Whisperer Frequent Elocutionist Offline No 1, 9.3x74R Posts: 3878 Location: Mountains of Virginia Joined: Apr 17^th, 2004	Re: Weighing bullets - process control Reply #111 - Dec 21^st, 2013 at 2:46pm	Print Post
	Now doing large-batch casting of ingots. This is two linotype size/style ingots of lead and 1-1/2 lbs of tin cast into two ingots. Cooling time was only a few minutes before mould could be stripped.

	Cat Whisperer (trk) Chief of Smoke Pulaski Coehorn Works and Skunk Works Drafted May 1970, Retired Maj. U.S.Army assra #9885
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Cat_Whisperer Frequent Elocutionist Offline No 1, 9.3x74R Posts: 3878 Location: Mountains of Virginia Joined: Apr 17^th, 2004	Re: Weighing bullets - process control Reply #112 - Dec 21^st, 2013 at 2:48pm	Print Post
	Ingots are about 4-1/2" in diameter. When I find out what % of what is in there I'll re-melt, clean and put into smaller ingots.

	Cat Whisperer (trk) Chief of Smoke Pulaski Coehorn Works and Skunk Works Drafted May 1970, Retired Maj. U.S.Army assra #9885
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Cat_Whisperer Frequent Elocutionist Offline No 1, 9.3x74R Posts: 3878 Location: Mountains of Virginia Joined: Apr 17^th, 2004	Re: Weighing bullets - process control Reply #113 - Dec 25^th, 2013 at 4:29pm	Print Post
	OK, welded the hole in the end of the 1/2 keg that I'd previously used for a smoker. Added between 300-400 lbs of lead-tin alloy to unify the 4 batches. Added heat, stirred, re-cast into 24-32 lb ingots (still hot haven't weighed). Pictures show the melt, the moulds and the first 8 ingots. ingots are about 4+" in diameter. They are cool enough to handle in MINUTES.

	Cat Whisperer (trk) Chief of Smoke Pulaski Coehorn Works and Skunk Works Drafted May 1970, Retired Maj. U.S.Army assra #9885
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Cat_Whisperer Frequent Elocutionist Offline No 1, 9.3x74R Posts: 3878 Location: Mountains of Virginia Joined: Apr 17^th, 2004	Re: Weighing bullets - process control Reply #114 - Dec 25^th, 2013 at 4:33pm	Print Post
	One 6" or so ingot in stainless pot. Last ingot and fractional ingot. Empty 1/2 keg on top of turkey fryer. And ONE 1-lb ingot to send in to get assayed. Tomorrow another 300-400 batch of WW-tin mystery alloy to be unified.

	Cat Whisperer (trk) Chief of Smoke Pulaski Coehorn Works and Skunk Works Drafted May 1970, Retired Maj. U.S.Army assra #9885
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Cat_Whisperer Frequent Elocutionist Offline No 1, 9.3x74R Posts: 3878 Location: Mountains of Virginia Joined: Apr 17^th, 2004	Re: Weighing bullets - process control Reply #115 - Dec 25^th, 2013 at 5:10pm	Print Post
	the big one is 61.6 lbs most other about 30 or 40 lbs. 352.4 lbs in ingots a couple of pounds tossed into a pot to empty the cauldron.

	Cat Whisperer (trk) Chief of Smoke Pulaski Coehorn Works and Skunk Works Drafted May 1970, Retired Maj. U.S.Army assra #9885
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Cat_Whisperer Frequent Elocutionist Offline No 1, 9.3x74R Posts: 3878 Location: Mountains of Virginia Joined: Apr 17^th, 2004	Re: Weighing bullets - process control Reply #116 - Dec 26^th, 2013 at 5:28pm	Print Post
	And the Heinz 57 alloy: 400.6 lbs in 14 ingots (the double row in the foreground). Hope to get both batches analyzed soon.

	Cat Whisperer (trk) Chief of Smoke Pulaski Coehorn Works and Skunk Works Drafted May 1970, Retired Maj. U.S.Army assra #9885
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Cat_Whisperer Frequent Elocutionist Offline No 1, 9.3x74R Posts: 3878 Location: Mountains of Virginia Joined: Apr 17^th, 2004	Re: Weighing bullets - process control Reply #117 - Jan 18^th, 2014 at 9:59am	Print Post
	The results of the xray defraction attached.

	Cat Whisperer (trk) Chief of Smoke Pulaski Coehorn Works and Skunk Works Drafted May 1970, Retired Maj. U.S.Army assra #9885
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SSShooter Frequent Elocutionist Offline Posts: 2917 Location: Southern NJ Joined: Aug 1^st, 2010	Re: Weighing bullets - process control Reply #118 - Jan 18^th, 2014 at 10:47am	Print Post
	Wow!!! #4 is going to a hard sucker. Am guessing the numbers got transposed. Want to sell any lead? Just getting a friend into the game and he needs 100#, or so to get going.

	Glenn - 2x CPA 44 1/2 w/22LR (Shilen ratchet-rifled & Bartlein 5R rifled), 38-40RH & 38-55WCF (Bartlein 5R rifled) & 40-65WCF (GrnMtn 'X') barrels
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Cat_Whisperer Frequent Elocutionist Offline No 1, 9.3x74R Posts: 3878 Location: Mountains of Virginia Joined: Apr 17^th, 2004	Re: Weighing bullets - process control Reply #119 - Jan 18^th, 2014 at 12:21pm	Print Post
	SSShooter wrote on Jan 18^th, 2014 at 10:47am: Wow!!! #4 is going to a hard sucker. Am guessing the numbers got transposed. Want to sell any lead? Just getting a friend into the game and he needs 100#, or so to get going. #4 is the lead-free solder (scaps/dross) that I buy from where I work. It MEASURES 42 or 43 on Rockwell B scale. (I sell it ONLY at the matches.) Don't want to sell. My objective here was to have a known batch of alloy (or two batches) that would last me maybe 10 years.

	Cat Whisperer (trk) Chief of Smoke Pulaski Coehorn Works and Skunk Works Drafted May 1970, Retired Maj. U.S.Army assra #9885
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