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Spare Parts to keep on hand? |
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floydthecat
Hard Corps Joined: Oct 13 2016 Location: Mississippi Status: Offline Points: 1998 |
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Posted: Oct 17 2021 at 11:15am |
Nope….mine are stainless steel and in a hard case. I don’t know if I would trust those plastic ones either? Maybe I gave a little more than $10, but it was not much more. My wife gives me $20 and takes my wallet and credit cards before she allows me to go shopping.
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floydthecat
Hard Corps Joined: Oct 13 2016 Location: Mississippi Status: Offline Points: 1998 |
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Just out of curiosity I grabbed a handful of feeler gauges to check my cheap Harbor Freight $10 digital calipers. Spot-on with the feelers. Couple of times a gauge would read off by .0005 (.0235 vs .024 feeler), but most of the time the reading matched the gauge. WAY better than government work.
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Smokpole
Hard Corps Joined: Oct 21 2019 Location: Madison ohio Status: Offline Points: 1057 |
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I prefer dial calipers. They are easy to check the zero on and adjust when needed. Plus they are easier to read with a good sized dial.
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OGCA Life member
NRA Life member Ashtabula Rod and Gun Life member |
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Matt_X
Hard Corps Joined: Nov 10 2020 Location: Phila, Penn Status: Offline Points: 771 |
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OK. I don't know where my brain was the other day. If you ever changed your own spark plugs then you have some sort of half decent feeler gages. When dealing with a caliper or micrometer of uncertain calibration. a) clean the jaws with a piece of paper. b) check the zero measurement. c) check the measurement against a feeler gage. I don't know what the tolerances are with a digital caliper but my guess is any offset will be either the same or linear. In other works if it reads .001" closed (zero), then it will probably read .036" on a .035" feeler gage.
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W5USMC
Moderator Group Joined: Apr 29 2017 Location: Missouri Status: Offline Points: 2959 |
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I've got a Hornady branded caliper that I think I paid close to $40 for, it is made in China, it works fine but is probably made in the same place that the Harbor Freight caliper was.
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Wayne
USMC Retired NRA Life Member |
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floydthecat
Hard Corps Joined: Oct 13 2016 Location: Mississippi Status: Offline Points: 1998 |
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Certainly nothing wrong with buying a better quality tool. There is a tolerance to about anything. A couple thousandths off one way or another is not going to matter in this case. These are what I use for everything, even reloading. If all you plan to use it for is checking head space on occasion, these are fine. Now, if I were a gunsmith or machinist I’d probably toss them in the trashcan. You can read where guys have measured their head space gauges and find them off by a tad vs. the published dimensions. The craftsmanship of the gauge and tolerance of the measuring tool are at work. Then you have human error. When you get down to measuring in terms of ten thousandths or even thousands, how tight to fit the instrument can vary and any two times you measure the same thing may be different.
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Matt_X
Hard Corps Joined: Nov 10 2020 Location: Phila, Penn Status: Offline Points: 771 |
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Oh I didn't mean another caliper, I meant something that could act as a gage block. Or if you have a friend nearby who has a gage block. I can't think of anything common off the top of my head but maybe someone will. Also I may be more picky than others.
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Rebel92
Grunt Joined: Jul 20 2021 Location: Hattiesburg, MS Status: Offline Points: 541 |
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unless someone (Floyd, you, or anyone else) shows me a better alternative, I will probably end up buying a somewhat nice one instead of buying a POS and having to buy another one to check it with.
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Matt_X
Hard Corps Joined: Nov 10 2020 Location: Phila, Penn Status: Offline Points: 771 |
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That is cheap! I use a vernier caliper. I think dad bought from Sears in the 70's. Never looses calibration if treated right and no batteries to go bad etc. All it needs is a good eye, or these days for me that means a magnifier or at least reading glasses. LOL I'd be Ok with a cheapy like that if I had something of known thickness to compare with ever so often. |
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Rebel92
Grunt Joined: Jul 20 2021 Location: Hattiesburg, MS Status: Offline Points: 541 |
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6 in. Composite Digital Caliper (harborfreight.com)
is this the el-cheapo you had in mind? anything that price has me curious.
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Matt_X
Hard Corps Joined: Nov 10 2020 Location: Phila, Penn Status: Offline Points: 771 |
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Yes. Not knowing how much the tape compresses, I measured before and after. Didn't seem to change much. If it wasn't mentioned, for the tape method the bolt needs to be disassembled. That way the extractor is not trying to grab a thick rim and also you won't be fighting the ejector. I did it because I wanted an answer right away and I have everything needed on hand. Having a machined gage that allows measurement with the bolt assembled could be real handy in any number of situations where bolt disassembly isn't practical. I wouldn't feel bad about that purchase at all.
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floydthecat
Hard Corps Joined: Oct 13 2016 Location: Mississippi Status: Offline Points: 1998 |
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A Harbor Freight model is inexpensive and good enough. Different brands of tape may vary in thickness, but most I have measured are like 1.5 thousandths.
I considered the use of tape pretty cheesy, until I watched a video of a Smith head spacing a bolt-action target rifle using the same technique. And he was after 1-2 thousandths of space….not 22. There are other ways to perform the measurement. You can do it like you would measure an M1 or M14. Feeler gauges between the rear of the right lug and the recess wall added to your case length.
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Rebel92
Grunt Joined: Jul 20 2021 Location: Hattiesburg, MS Status: Offline Points: 541 |
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guess i need a caliper for the tape method?
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Matt_X
Hard Corps Joined: Nov 10 2020 Location: Phila, Penn Status: Offline Points: 771 |
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"If it tries to rotate with little or no thumb-assist, it’s on the edge of failing." Having just done this using your tape method, that's a great description. I cheated a little. First I used masking tape as it let me get close the go/no go range to something like 2.94 to 3.04" Then redid it using a stack of scatch tape starting around 2.94 and by 2.97 it wasn't going to fully rotate even with moderate pressure. It will make sense when you do it. Odds of it passing? I bet the odds are heavily in your favor unless mating surfaces are really worn. |
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Rebel92
Grunt Joined: Jul 20 2021 Location: Hattiesburg, MS Status: Offline Points: 541 |
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okay sounds good. so I actually just want it to touch it without beginning to rotate. think I understand.
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Rebel92
Grunt Joined: Jul 20 2021 Location: Hattiesburg, MS Status: Offline Points: 541 |
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excellent, thank you. What are the odds of the bolt I purchased not headspacing properly? Just curious.
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floydthecat
Hard Corps Joined: Oct 13 2016 Location: Mississippi Status: Offline Points: 1998 |
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You will feel much better if it doesn’t try to rotate. Pressure is a subjective quantity when it comes to head spacing. Slight-pressure to rotate can mean different things to different people. If it tries to rotate with little or no thumb-assist, it’s on the edge of failing.
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W5USMC
Moderator Group Joined: Apr 29 2017 Location: Missouri Status: Offline Points: 2959 |
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Yes as long as it does not completely close. Also see below picture.
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Wayne
USMC Retired NRA Life Member |
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Rebel92
Grunt Joined: Jul 20 2021 Location: Hattiesburg, MS Status: Offline Points: 541 |
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thanks. as long as it doesnt go fully into battery is considered "Passing?" or what exactly?
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Rebel92
Grunt Joined: Jul 20 2021 Location: Hattiesburg, MS Status: Offline Points: 541 |
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Yes, i ordered the Forester Field so it can be tested while the bolt is intact. as long as it doesnt go all the way into battery I am good? Or do I not want it to even begin to rotate downwards?
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