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Post by bowbender6 on Apr 5, 2009 12:34:21 GMT -5
Here is the current version of the sabot gauge. Thanks to all for help, I teach electronics to disables adults to help them find employment and I am learning about machining. I am helping at the school with an assessment program where the students try different areas to see what training they can do and like. The sabot gauge would be a project for them. I started this a year ago and is had been more difficult than I thought to get the hole the right size. I have reamers from .500 through .509 except for .507. Thanks to Edge’s suggestion to float the reamer these hole are close. I checked each hole with a set of pin gauges that are supposed to be accurate to .0001”, but the gauges are every .001”. After building these and checking probable .500 to .506 should work. I now will work on saving space as the aluminum is $$$. I push the bullets through the gauge and when it is a little firm (about 20-30 lbs. of loading pressure) that is the gauge number I use. This also works when knurling bullet to check their size. You can tell the sabot fit better than with micrometers because of the tension. To give you guys and idea, here are what I get with some the popular bullet sabot combos. Barnes TMZ boattail .501”= EZ load blue sabot .502”= New Harvester Yellow crushed rib .504”= Barnes Yellow sabot .458” bullets .505”= Black Crush Rib .504”= Orange MMP .452” Bullets .504” = Red crush rib .504” = HPH12  |
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Post by jims on Apr 5, 2009 15:13:56 GMT -5
Nice work and write up.
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Post by Richard on Apr 5, 2009 18:57:26 GMT -5
Nice illustration Bowbender. I recall you working on that project last year but it sort of fadded and never heard you talk of it again.
I firmly believe that consistent pressure along accurate powder charges (within one or two tenths of a grain) are key to getting low Extreme Spreads in velocity which relate to smaller groups.
Richard
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Post by fowlplay on Apr 6, 2009 1:04:33 GMT -5
Very nice guage. It is good to know the size of those new harvester Tmz sabots. Thanks,
Steve
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Post by KerryB on Apr 6, 2009 8:13:43 GMT -5
Am i correct in assuming these will be for sale some day? What do you think they might sell for if so? THX, KerryB
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Post by mshm99 on Apr 6, 2009 8:58:16 GMT -5
Very nice. I like!
mshm
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Post by bowbender6 on Apr 6, 2009 13:09:10 GMT -5
Someday - hopefully soon , I will make them available, mostly I would like to recover the costs of the aluminum. I have been in bussiness before and for what little you could make on this I don't think it would be worth my trouble. I would like to get this out ot some of you guys so we could maybe figure out this sabot thing better.
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Post by younghunter86 on Apr 6, 2009 14:01:45 GMT -5
I would love to get one of those things. There are a lot of combinations I would like to try to push down the bore and this would take a lot of the guess work out of it. It should be a lot more "accurate" gauging how hard or tight something will fit using this rather than just measuring outside diameter.
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Post by rexxer on Apr 6, 2009 14:15:44 GMT -5
bowbender-I understand when you say miking a sabot feels mushy. It seems like you can squeeze a little too much or too little. I think pushing them through those gages would be more consistent!
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