39TDS Posted December 12, 2012 Report Share Posted December 12, 2012 If I took my .22 to a machine shop and asked them to chop a bit off and put a thread on the end is there anything else I need to say? What does a crown involve? Heard it talked about often enough and assume it is something to do with the angle of finish, beyond that I don't know. Do they have to be authorised to do it? Do I have to stand and wait as it is my FAC that covers the gun even if I just gave them the barrel? I would have to tell them which thread to actually put on it, what should I say? (I know there's a choice of 2 but what exactly are they?) Lets assume I don't want it proofed. Quote Link to comment Share on other sites More sharing options...
Catweazle Posted December 12, 2012 Report Share Posted December 12, 2012 (edited) A favoured crown is a simple 11 degree cone cut into the face of the barrel, easy for any engineering shop to do, you can then finish it off by hand using a steel ball-bearing and fine grinding / lapping paste. Here's a post with the ball bearing technique http://www.airgunbbs.com/showthread.php?131427-Re-Crowning-barrel-step-by-step Edited December 12, 2012 by Catweazle Quote Link to comment Share on other sites More sharing options...
DaveK Posted December 12, 2012 Report Share Posted December 12, 2012 I'll do it. I've got the right tools: hacksaw thread tapping dies from Aldi Dremel with crown cutting bit jobs a goodun Quote Link to comment Share on other sites More sharing options...
gixer1 Posted December 12, 2012 Report Share Posted December 12, 2012 I'll do it. I've got the right tools: hacksaw thread tapping dies from Aldi Dremel with crown cutting bit jobs a goodun Posh ***! I've got a hacksaw and a thin file, but I can do it cheaper than him Quote Link to comment Share on other sites More sharing options...
cant hit rabbits 123 Posted December 12, 2012 Report Share Posted December 12, 2012 (edited) I've got oxy acetylene and a chisel, I'm faster AND cheaper. Ona serious note, I have no doubt that a good machine shop could do it, but a gunsmith will know much better what he is doing and you won't have any legal issues if you leave it with a gunsmith to do. Edited December 12, 2012 by cant hit rabbits 123 Quote Link to comment Share on other sites More sharing options...
39TDS Posted December 13, 2012 Author Report Share Posted December 13, 2012 I'll do it. I've got the right tools: hacksaw thread tapping dies from Aldi Dremel with crown cutting bit jobs a goodun I have read on tinternet that you can indeed do it yourself. I would, but I wanted it threaded too and i can't do that. All very well saying just take it to the gunsmiths, there are none handy to me. There is a handy machine shop though. It was a question, simply because I don't know the answer. Gun will be for rabbit control and I would say maximum range of 60 yards, more likely 40yards or even less. I'm thinking it would have to be a right balls of a job to mess up the accuracy of that range. I appreciate a gunsmith may have more experience but a good machine shop is probably better than a **** gunsmith (and vice versa) Quote Link to comment Share on other sites More sharing options...
DaveK Posted December 13, 2012 Report Share Posted December 13, 2012 I have read on tinternet that you can indeed do it yourself. I would, but I wanted it threaded too and i can't do that. All very well saying just take it to the gunsmiths, there are none handy to me. There is a handy machine shop though. It was a question, simply because I don't know the answer. Gun will be for rabbit control and I would say maximum range of 60 yards, more likely 40yards or even less. I'm thinking it would have to be a right balls of a job to mess up the accuracy of that range. I appreciate a gunsmith may have more experience but a good machine shop is probably better than a **** gunsmith (and vice versa) Good decision. A gunsmith will do it right and cut the thread concentric to the bore. Some machine shops may not realise this and cut it to the external barrel dimensions. Quote Link to comment Share on other sites More sharing options...
Catweazle Posted December 13, 2012 Report Share Posted December 13, 2012 Good decision. A gunsmith will do it right and cut the thread concentric to the bore. Some machine shops may not realise this and cut it to the external barrel dimensions. I wonder if the manufacturers set the barrels up this way, or do they just chuck the barrel in a CNC lathe and cut it based on outside dimensions. It's not technically demanding, a competent machine shop shouldn't struggle with something that simple. Quote Link to comment Share on other sites More sharing options...
Bewsher500 Posted December 13, 2012 Report Share Posted December 13, 2012 if you have had a nice 11 deg concentric crown cut...for god sake don't let anyone near it with a ball bearing and some grinding paste! the key words are: "concentric to the bore"! everything, thread crown, cut, Quote Link to comment Share on other sites More sharing options...
Catweazle Posted December 13, 2012 Report Share Posted December 13, 2012 if you have had a nice 11 deg concentric crown cut...for god sake don't let anyone near it with a ball bearing and some grinding paste! It just takes the burr off, it works too. Quote Link to comment Share on other sites More sharing options...
Rimfireboy Posted December 13, 2012 Report Share Posted December 13, 2012 Any experienced lathe operator would be able to carry out such a simple job with ease. Quote Link to comment Share on other sites More sharing options...
sitsinhedges Posted December 13, 2012 Report Share Posted December 13, 2012 Hi, I'm Larry Potterfield and that's the way it is Quote Link to comment Share on other sites More sharing options...
39TDS Posted December 13, 2012 Author Report Share Posted December 13, 2012 Panic over, I bought a diddy little gun instead. Quote Link to comment Share on other sites More sharing options...
Andy135 Posted December 14, 2012 Report Share Posted December 14, 2012 Hi, I'm Larry Potterfield and that's the way it is Lol. Very good. Quote Link to comment Share on other sites More sharing options...
Mr Majyk Posted December 16, 2012 Report Share Posted December 16, 2012 Hi, I'm Larry Potterfield and that's the way it is HAHAHAHAHAHAHA!!! Quote Link to comment Share on other sites More sharing options...
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