DarkLite Posted June 17, 2007 Report Share Posted June 17, 2007 Righto, need some advice. I'm making a custom silencer for someone, for a standard AK beta. I need to know the tap I should be buying - I know it's 14mm, but is there any other specifics that I'm missing? Link to post Share on other sites
r.ocelot Posted June 17, 2007 Report Share Posted June 17, 2007 When tapping, use cutting fluid. A few turns in, 1 turn out. Link to post Share on other sites
Lance Jackass Posted June 17, 2007 Report Share Posted June 17, 2007 There are some good guides out there i used for doing my A level design coursework. http://www-mdp.eng.cam.ac.uk/nagty/resourc...ng/tapping.html Drill the hole to the correct tapping size. http://www3.telus.net/public/aschoepp/tapdrill.html Get the tap, with some cutting compoud on it and put it into a pillar drill to start it off. With the work underneath, turn the drill by hand a few times to stop the tap going in "drunkenly." When its made a start, take the tap out of the drill and use the tap handle on the tap. You want to be turning 1/2 turn forwards, then 1/4 turn back all the time. Try not to let the tap get right to the bottom of the hole as they can snap, which is a right pain. As for the tap, as well as 14mm, you'll need to know whether its CW or CCW - right or left hand turn. Link to post Share on other sites
r.ocelot Posted June 17, 2007 Report Share Posted June 17, 2007 How many turns you do depends on the material. If you're using steel, do exactly as lance said. Link to post Share on other sites
socomtactical.net Posted June 17, 2007 Report Share Posted June 17, 2007 when i do conduit i all ways work on the 3:1 ratio Link to post Share on other sites
mwaggs_jd Posted June 17, 2007 Report Share Posted June 17, 2007 You will need a thread guage to determine the proper pitch of threads to cut. Taps and dies have two numbers associated with each one, the diameter (14mm) and the pitch (how many threads per inch/mm), you also need a tap for negative threads. Link to post Share on other sites
MDK_Marshal Posted June 17, 2007 Report Share Posted June 17, 2007 I was about to say - thread pitch., No use having a 14mm thread if the pitch is wrong, nothing will fit it. Link to post Share on other sites
Toreodor Posted June 17, 2007 Report Share Posted June 17, 2007 i wasn't aware we could even buy 14mm negative. Anyone have a link to a retailer? (assuming the pitch and all is the standard airsoft set.) I gave up on this two years ago, but if now i can, why not? Link to post Share on other sites
DarkLite Posted June 18, 2007 Author Report Share Posted June 18, 2007 Ok, so 14mm negative. Makes sense - but for a stock TM (and I assume pretty much everything else, as that seems to be the airsoft standard) what kind of TPI pitch am I looking for? I'd imgine it's rather small... Link to post Share on other sites
Sale Posted June 18, 2007 Report Share Posted June 18, 2007 The thread would be M14x1 LH. The 1 means that the pitch is 1 mm per turn. Taps like this are usually special order only, and will cost more than a ready made silencer by King Arms. You'll also need a lathe to be sure the thread and can are aligned. You can't eyeball it. -Sale Link to post Share on other sites
Sh0ty Posted June 18, 2007 Report Share Posted June 18, 2007 Yes, so in short, 1mm pitch thread. Completely non standard pitch. -Sh0ty Link to post Share on other sites
DarkLite Posted June 18, 2007 Author Report Share Posted June 18, 2007 Ah. Best get some second hand flash hiders then, and start building around those. Link to post Share on other sites
Sale Posted June 18, 2007 Report Share Posted June 18, 2007 Yes, so in short, 1mm pitch thread. Completely non standard pitch. Well it does follow a standard, just not the most common one. DarkLite: Building around an old flash hider is a good idea, as long as you're careful with the alignment. -Sale Link to post Share on other sites
DarkLite Posted June 18, 2007 Author Report Share Posted June 18, 2007 Unless I get a rediculously large order of custom made silencers, of course. Link to post Share on other sites
Tom Andrews Posted June 18, 2007 Report Share Posted June 18, 2007 Can I just point out, the longer the proposed silencer(s) the more accurate you need to get the thread alinement right. On a short silencer 1/2 degree won't make a lot of difference, on a long one, that is enough for a bb to clip the exit. So the pillar drill wil work fine for a short silencer, but you really do need a lathe for bigger items. Link to post Share on other sites
warthog Posted June 18, 2007 Report Share Posted June 18, 2007 Even in Germany were Metric threads are standard, a M14 LH iron is about 70€(~90$). A good lathe should be able to turn such a thread more economical. Link to post Share on other sites
RPK Posted June 18, 2007 Report Share Posted June 18, 2007 I know its in the US, but this place has LH 14x1mm taps and dies http://www.victornet.com/cgi-bin/victor/index.html The tap is $28 Link to post Share on other sites
DarkLite Posted June 19, 2007 Author Report Share Posted June 19, 2007 Thanks for the link! Problem is though, as others have pointed out, I need a lathe, and in HK, heavy machinery (and the space for them) is as rare as rocking horse *beep*... not to mention horrifically expensive. Case in point - cordless DREMEL is $110USD here... the same one they sell for $60 in the US. Link to post Share on other sites
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