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Posted: 12/11/2004 4:08:47 PM EDT
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While getting ready to remove the FSB from my 20" (new postban barrel assy) , I noticed that the small end of the pins were not on the same side of the base. The front one drove out from the right and the rear one from the left. Now when I was going to reinstall the FSB I used my dial calipers to measure the holes in both sides to double check my orientation. All 4 holes measure about .122" by way of my calipers. Er ? I then measured the pins and they appear to be straight pieces of .125" drill rod with about .050 of one end bevelled down to .100" or so as if it were spun against a grinder on an angle. I don't have the right size drill bit to check the tunnels in the barrel, but neither end of either pin will go into these holes far enough by hand that you cannot see the end of it at the pointed end of the hole. Would I be safe in ASSuming that since the pins aren't actually tapered, the maker was counting on an interference fit to keep things tight ? And should I not worry about it as long as I get the things jammed back in tightly anyway ? This is the first FSB I've removed so I don't have anything to judge by. Thanks for any help , Rip |
That's a 10-4 , as long as the drilled holes matched the profile of the pins I was hoping there wouldn't be a functionality issue. I've got some new epoxy I've been wanting to try and this might be the time to do it. Treetop,. if I want something from a non-big4 company in the future I will be sure to call/email the dealer and ask before ordering. Thanks for the help guys. This barrel is going on the MGI upper as part of my informal test and a moving or leaky FSB wouldn't help the results. Rip ETA These dowels are HARD , I would think that the taper pins are cheaper. Maybe something besides $$ is involved ? |
Dowel pins are a common item at any hardware store or machine supply shop, and the proper reamer is an off-the-shelf tool. Taper reamers are harder to find, harder to use properly (going too far makes the hole too big), and more expensive. It could be argued that since a dowel pin is of even diameter throughout its length, that the interference fit throughout the hole is more uniform- thus creating a more stress-free and equally loaded attachment. I've never had a problem I could directly relate to either taper or dowel pins, or even roll pins. |
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