arkadi Posted November 19, 2016 Share Posted November 19, 2016 (edited) In case you never saw titanium comp cracking - this is for you. Probably, I should be more thoroughful rounding and polishing rough edges next time. 1. Should I blast new comp with glass or aluminum oxide? 2. How common is that? Edited November 19, 2016 by arkadi Link to comment Share on other sites More sharing options...
user293 Posted November 19, 2016 Share Posted November 19, 2016 That'll buff out Link to comment Share on other sites More sharing options...
Garmil Posted November 19, 2016 Share Posted November 19, 2016 Is that a binary engineering comp? Link to comment Share on other sites More sharing options...
teros135 Posted November 19, 2016 Share Posted November 19, 2016 1 hour ago, user293 said: That'll buff out Dremel first, then buff. Link to comment Share on other sites More sharing options...
drewbeck Posted November 19, 2016 Share Posted November 19, 2016 Agreed, a dremel and then a good buff and you got a solid 2 port comp going on. did you finish the mag? Link to comment Share on other sites More sharing options...
Sarge Posted November 19, 2016 Share Posted November 19, 2016 LOL. THAT is not a crack! Link to comment Share on other sites More sharing options...
teros135 Posted November 19, 2016 Share Posted November 19, 2016 9 minutes ago, Sarge said: LOL. THAT is not a crack! Sure its a crack. Well, two cracks. Two big cracks. And a kind of folding over after the cracking. Seriously, though, it gives one some apprecation for the power of the gasses the comp is trying to corral. Link to comment Share on other sites More sharing options...
Sarge Posted November 19, 2016 Share Posted November 19, 2016 7 minutes ago, teros135 said: Sure its a crack. Well, two cracks. Two big cracks. And a kind of folding over after the cracking. Seriously, though, it gives one some apprecation for the power of the gasses the comp is trying to corral. I don't see any bullet strikes so I'm assuming there were cracks there for awhile until they gave way? Link to comment Share on other sites More sharing options...
arkadi Posted November 19, 2016 Author Share Posted November 19, 2016 The final image above is a work of man, just before we removed last chamber with a wrench. I shot through half the training session with a crack which I noticed a day before, and then bullets started flying like a feet lower at 10 yards, presumably due to strikes. It's a copy of Binary Eng comp in cone flavor made for CZ. Jared do not produce custom designs, so I bought his comp and made a copy. Unfortunately, two chamber "design" leaks a lot of gas and is not usable for major. Link to comment Share on other sites More sharing options...
PPGMD Posted November 21, 2016 Share Posted November 21, 2016 The front fell off. Link to comment Share on other sites More sharing options...
ano Posted November 21, 2016 Share Posted November 21, 2016 hahahahaha PPGMD Link to comment Share on other sites More sharing options...
arkadi Posted December 3, 2016 Author Share Posted December 3, 2016 This is how it started. Link to comment Share on other sites More sharing options...
MikieM Posted December 3, 2016 Share Posted December 3, 2016 Heartbreaking, yes. Funny, hell yes! Link to comment Share on other sites More sharing options...
Aircooled6racer Posted December 3, 2016 Share Posted December 3, 2016 Hello: Looks like some harmonics were coming into play. Was the comp hitting the slide perhaps? Thanks, Eric Link to comment Share on other sites More sharing options...
arkadi Posted December 3, 2016 Author Share Posted December 3, 2016 Not a chance, but it was a cone comp. There was noticeable free play at slide forward locked position. Accuracy was excellent though. Link to comment Share on other sites More sharing options...
38super Posted December 4, 2016 Share Posted December 4, 2016 stress riser at the sice ports, notice it did not crack at the radius. Link to comment Share on other sites More sharing options...
abb1 Posted December 4, 2016 Share Posted December 4, 2016 (edited) On 11/19/2016 at 7:41 AM, arkadi said: SEEE!.......................................................I'm running major...........Honest! Hahahaha! Sorry, back to the problem! Two things contributed to this happening. The first most is the choice of titanium. Titanium is key when wanting a weight/strength ratio for its use. Titanium is considered a superior combination of high strength and low weight ratios when compared to steel, however, it is not as strong as steel. Its use is mostly calculated in when weight is a factor. The second has already been pointed out where the stressers were clearly in the side ports. If side ports were not used, you would be ok, however, with the high pressure gasses of 9mm major with the combination of titanium, and side ports, this is the potential. I would opt for steel over titanium in a comp with multiple ports. Edited December 4, 2016 by abb1 Link to comment Share on other sites More sharing options...
GrumpyOne Posted December 4, 2016 Share Posted December 4, 2016 Link to comment Share on other sites More sharing options...
arkadi Posted December 4, 2016 Author Share Posted December 4, 2016 I'll try with titanium once more - with thicker side walls and glass blasting. If that cracks, stainless then. Link to comment Share on other sites More sharing options...
jid2 Posted December 5, 2016 Share Posted December 5, 2016 What grade titanium? That had me worried there, until I saw it on a CZ and knew it wasn't one of mine. You need to deburr every edge, and remove all stress risers. It also looks like your nominal wall thickness is thin in some areas? Link to comment Share on other sites More sharing options...
jid2 Posted December 5, 2016 Share Posted December 5, 2016 Also, what powder and load are you running? Link to comment Share on other sites More sharing options...
MikieM Posted December 5, 2016 Share Posted December 5, 2016 JB Weld, maybe. Link to comment Share on other sites More sharing options...
Absocold Posted December 5, 2016 Share Posted December 5, 2016 If I remember correctly, Ti work hardens and must be stress relieved (usually by annealing) between major cutting and final finish work. If you don't, you get this. Also there are many different grades and alloys of Ti, use the wrong one for your application and you'll have a bad time. Link to comment Share on other sites More sharing options...
arkadi Posted December 5, 2016 Author Share Posted December 5, 2016 (edited) The walls are of the same thickness as the original, but I'll check. Comp on the left is aluminum prototype. I use 8.3gn of 3N38 with 124gn (IPSC) lead coated bullets for a PF of 165. I rounded and polished chambers walls after milling with Dremel. Informative points gentlemen, I'll discuss them with my machinist. I'll get back to you with the info: (1) which Ti alloy was used and (2) was it relieved. Which alloy (number) do you recommend? While I understand the process in general, I have nor machinery nor skills nor time to do the work myself. So actual lathe and milling works are outsourced. My country is mostly about wooden shoes and agriculture, so getting anything of industrial custom work done is a pain. If anyone of you reading this thread would like to do a very small batch of properly done comps for me - Ti and/or stainless - I would be glad to send you everything I have on hands and pay for the product. I'm open to other comp designs too. Edited December 5, 2016 by arkadi Link to comment Share on other sites More sharing options...
Absocold Posted December 6, 2016 Share Posted December 6, 2016 Seems like it would be cheaper and much less headache to just buy a Ti comp than make your own. Either modify your barrel to take the comp or just get a conversion cone and mount any comp you want by threading it to match the cone. Then mill the exterior of the comp down to match your slide. I'll holler at kneelingatlas, he may have a better idea for you. Link to comment Share on other sites More sharing options...
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