Fuck ME!
A tank-dump at 2000psi, that was fun. The silencer and chrony did 1044fps. And survived. 😆
So, I’m pretty sure the various seal configurations had been leaking, but I got to a point where I thought no way jose anymore. So it had to be the two holes I’d mistakenly drilled and sealed with brass bungs. I wrapped insulation-tape around those areas and no more leak. Hurrah!
In with Sean’s spring, got 945fps at 1500psi, but only 700 at 2000psi. Made a longer tophat but still no go. Put an extra spacer in, the difference of which was immediately noticeable when I cocked the rifle. I guess I should have put the shorter tophat back in at that point (the longer one has a full 10mm travel). BANG WHOOSH! 😆
So, fingers crossed that with the shorter tophat in I’ll finally be there. At least at 2000psi, not sure what’ll happen at 2500 and 3000. An extra inlet-port might be a good idea, more flow-through for the same tophat-travel.
All Replies
Did he say that he was going to type a Long Reply? No Kidding!!!
And he has seen attitudes like he is seeing here before? Humm! No Kidding!!!—–Now that’s shocking.
Hi IQ? 😯 Never seen one of those before.
All hale the master!
Each and every post is a debate. All hail the Master DeBater. From now on I’m going to call ya Da MasterBater! Guess my IQ just isn’t as high as yours! MuaHaaaHaaa 😈 !!!
I am honored by your presence.
Knife Maker
It’s pretty straight forward once you’ve mastered it. One tip if your using tungsten carbide bits. Don’t let your bit be in a cutting pass when stopping the motor. Starting it up again WILL breack your tip.
Hope this makes sence!
Cheers
I’ve been putting the dies in a holder in the tail-stock. I certainly wouldn’t try steel at that size, but brass should be doable? It’s a 1.5hp motor.
The problem with learning how to use my lathe is the manual came with nothing about the gears and screw-cutting. I don’t know what’s in there now, let alone how they’re already setup and much less how to switch them around to get different ratios etc. I know I could probably work it out, maybe within a couple of years even ( 😆 ) but unless it becomes an absolute necessity I simply can’t be arsed. And I’ve already read of another guy with the same lathe who took one look in the gearbox and changed all the gears “for proper ones”. Then he put a wiper-motor on the screw, so he could “cut threads properly”. That sort of stuff doesn’t fill one with confidence as to the possibilities.
But I appreciate the suggestion, thanks. 🙂
Using dies with does kind of diameters will requier pretty amount of muscle! So learn how to screw cut on a lathe. First try on POM/Delrin, move up to aluminium/brass than free machining steel(strong enough for valve bodies) C45 low carbon steel. If you master that you can make everything you want. Put your cross slide at 60 degrees so to cut just at one face off your turning bit. Use plenty of lubrication. And use a screw cutting clock or don’t unlock your feed nut(don’t know how it’s called!
It’s pretty straight forward once you’ve mastered it. One tip if your using tungsten carbide bits. Don’t let your bit be in a cutting pass when stopping the motor. Starting it up again WILL breack your tip.
Hope this makes sence!
Cheers
I changed to steel cos i get 3mtr of B.D.M.S hex for the same £ as .5 mtr of brass. Pluss brass is messy, and when its in my eye i cant get it out with a magnet.
Also i changed designe cos this style is better. Certainly not cos it’s easier.
I thought Pablo told me about the brass leaking, but he’s just told me not so. God knows where I got that from then. 😕
I don’t enjoy machining steel at all, it takes forever and I have to use coolant, which makes a right pigging mess. A stem I can just about cope with, but a whole body? BOLLOCKS TO THAT! 😆
I changed to steel cos i get 3mtr of B.D.M.S hex for the same £ as .5 mtr of brass. Pluss brass is messy, and when its in my eye i cant get it out with a magnet.
Also i changed designe cos this style is better. Certainly not cos it’s easier.
Amen to that, next man.
I’ve come across the same kind of BS many times and places before. There’s always a bunch of arseholes who are sooo up themselves, who think they know everything so much better than anyone else, who are incapable of giving advice open-mindedly and letting the recipient take it or leave it as he pleases, who expect the recipient to fawn and grovel and defer and pander to their sad-sack egos. And this place has been no different. No clique you say? Oh puh-LEESE. If there wasn’t this would be the first fucking forum in history without one!!! There’s the usual clique, the hard-core group of smug habituals, with their follower-ons, holding court and basking in the light of their own imagined superiority. Don’t talk to me about “far over-inflated sense of worth” mate, you’re not talking to some been-nowhere, seen-nothing idiot. I know exactly what the coup is here. And I’m fine with it. Just don’t expect me to sit back, roll over and take it without comment. I like a good laugh too, a bit of entertainment, and I’m quite capable of putting the boot on MY foot. Apparently. 😆
I think that this posts sums up 100% just why you have an inflated sense of your own worth, Lang. Pray, tell me just what you have done that makes you so grand or such an expert on what makes this forum so stuck up? Seems strange to me that you keep babbling on about how smart you are and how high your IQ is (what are you, 12?) yet wherever you go it is the other people that are the meanies, not you. Makes you think, eh? I get the impression that you’re one of those sad odd-bod types who loves nothing better than moaning about how the world would be a better place if people just listened to you because they know nothing and you know everything.
Good luck with all of that, Broheim.
I’m as big a piece of worthless human shite as the next man.
Glad we can agree on something.
Really though, enjoyed this thread and lots of good info.
I’ll be joining your quest for home built valves shortly and will share my failure/successes here too. maybe I won’t add too much trash to my scrap bucket in the process.
I’ll have to order two new dies first, for the two external threads on the body (whatever they are, it’s posted somewhere). Plus I need a break from that infernal machine, I’m quite burned-out. 😆
from what i can find, m18-1.5 on the bottle end and 7/8-14 on the gun end of the valve. I need to order them as well. threading w/ the lathe is still in the stage of learning process here. Dies much simpler and more repeatable at this point (less resulting scrap metal)
Cheers Sharp, I’ll get mine ordered tomorrow.
I know people swear by lathe-threading, but the manual that came with mine is deficient in that area to say the least. And if a die does the job I see little use in learning it anyway, because I’d still use a die even if I knew how to do it on the lathe. Which is why I’ll never be threading barrels. Probably. 😆
Back to the drawing-board. Some additional dies, a full brass body and a venturi-effect stem.
Thanks to you chaps I won’t have to build shed-loads of prototypes, you’ve already done all of the R&D. Thanks for being so generous as to openly share it, that really is uncommonly big-hearted and extremely commendable. Hundreds of hours of hard slog donated to the common weal. 😀 😀 😀
Now go cut up some metal and let us know how it turns out! 😛 😛 :2
Really though, enjoyed this thread and lots of good info.
I’ll be joining your quest for home built valves shortly and will share my failure/successes here too. maybe I won’t add too much trash to my scrap bucket in the process.
I’ll have to order two new dies first, for the two external threads on the body (whatever they are, it’s posted somewhere). Plus I need a break from that infernal machine, I’m quite burned-out. 😆
from what i can find, m18-1.5 on the bottle end and 7/8-14 on the gun end of the valve. I need to order them as well. threading w/ the lathe is still in the stage of learning process here. Dies much simpler and more repeatable at this point (less resulting scrap metal)
I did not say it worked on venturi.
I just know it works
shrpshotr28:
Get to maken chips man!
Mark
I know that, you’ve already said you know nothing about venturi. But looking at the maths/design/physical dimensions I can’t think of any other explanation. I’m not even sure if the venturi effect can be applied to gas under pressure, so call it my best guess.
But as you say, who cares? Your design not only delivers the power, it does so with a stock spring. That is elegance mate. 😀
Lang:
I did not say it worked on venturi.
I just know it works
shrpshotr28:
Get to maken chips man!
Mark
Back to the drawing-board. Some additional dies, a full brass body and a venturi-effect stem.
Thanks to you chaps I won’t have to build shed-loads of prototypes, you’ve already done all of the R&D. Thanks for being so generous as to openly share it, that really is uncommonly big-hearted and extremely commendable. Hundreds of hours of hard slog donated to the common weal. 😀 😀 😀
Now go cut up some metal and let us know how it turns out! 😛 😛 :2
Really though, enjoyed this thread and lots of good info.
I’ll be joining your quest for home built valves shortly and will share my failure/successes here too. maybe I won’t add too much trash to my scrap bucket in the process.
I’ll have to order two new dies first, for the two external threads on the body (whatever they are, it’s posted somewhere). Plus I need a break from that infernal machine, I’m quite burned-out. 😆
Back to the drawing-board. Some additional dies, a full brass body and a venturi-effect stem.
Thanks to you chaps I won’t have to build shed-loads of prototypes, you’ve already done all of the R&D. Thanks for being so generous as to openly share it, that really is uncommonly big-hearted and extremely commendable. Hundreds of hours of hard slog donated to the common weal. 😀 😀 😀
Now go cut up some metal and let us know how it turns out! 😛 😛 :2
Really though, enjoyed this thread and lots of good info.
I’ll be joining your quest for home built valves shortly and will share my failure/successes here too. maybe I won’t add too much trash to my scrap bucket in the process.
Shit, I knew it…venturi effect. 😡 Should have trusted my memory/intuition.
Back to the drawing-board. Some additional dies, a full brass body and a venturi-effect stem.
Thanks to you chaps I won’t have to build shed-loads of prototypes, you’ve already done all of the R&D. Thanks for being so generous as to openly share it, that really is uncommonly big-hearted and extremely commendable. Hundreds of hours of hard slog donated to the common weal. 😀 😀 😀
- You must be logged in to reply to this topic.
And he has seen attitudes like he is seeing here before? Humm! No Kidding!!!—–Now that’s shocking.
Hi IQ? 😯 Never seen one of those before.
All hale the master!
Each and every post is a debate. All hail the Master DeBater. From now on I’m going to call ya Da MasterBater! Guess my IQ just isn’t as high as yours! MuaHaaaHaaa 😈 !!!
I am honored by your presence.
Knife Maker
Jack Daniels…?