rcmodel
Member in memoriam
Well, that does it!!!
Time to take the band saw to the whole thing and scrap it!!! :banghead:
No, I continue to be amazed by your remarkable skill!!!
Simply amazing!!!
rc
1/2 scale AR-15
- Thread starter MachIVshooter
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Time to take the band saw to the whole thing and scrap it!!! :banghead:
No, I continue to be amazed by your remarkable skill!!!
Simply amazing!!!
rc
OP
OP
MachIVshooter
Member
Probably should, huh?
I will redo it at a later date, this time using measurements from centerline of my upper instead of just halving the 2.4" MI rail.
NickEllis
Member
Gaiudo said:
I saw that he made the receiver extension and buffer. I assume there is some size / strength of spring already made that can be made to work.
Maybe I missed the origin of the buttstock in the 8 pages of discussion before. If I did, you could have just directed me to the correct page.
OP
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MachIVshooter
Member
Well, I was cutting a faux barrel from some steel round stock and smoked another capacitor in my phase converter :banghead:
Think we'll step it up to a 330V cap and see what happens. Hope I don't end up having to go rotary.........
Think we'll step it up to a 330V cap and see what happens. Hope I don't end up having to go rotary.........
jmorris
Member
- Joined
- Sep 30, 2005
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- 24,106
All a rotary is, is a cap converter connected to a motor that runs non stop.
If you are reversing much or really loading it down, get a 3ph motor off of eBay and ph convert it with caps and let it sit there running. The inertia of it allows you to have more "power" for your converted machines.
If you are reversing much or really loading it down, get a 3ph motor off of eBay and ph convert it with caps and let it sit there running. The inertia of it allows you to have more "power" for your converted machines.
Bobson
Member
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MachIVshooter
Member
Right, but a rotary does actually convert single phase to three, rather than the static making 2 phase with a gap. Thus it gives 100% power instead of 66%, and the capacitors aren't working as hard with all three windings at each pole being powered.
We'll see how the bigger caps handle it. It's odd, since the 3 HP mill hasn't been a problem, but the 1 HP lathe keeps killing them. Only thing I can think is the lathe motor has fewer poles, so it's working them harder.
double bogey
Member
Have you considered a vfd? They aren't that expensive nowadays.
chicharrones
needs more ammo
I haven't exactly opened up phase converters to follow the complete electrics on them, but the rotary type essentially has an electric motor/generator that generates the 3rd leg of power. So, 230 VAC 1-phase (2 legs) to the converter as well as the same 230 VAC 1-phase to the machine. Then the converter generates the 3rd leg of power to the machine.
What I've seen on 5 to 7 horsepower machines is that when they go to full amp load that the shared 1-phase with the machine and converter gets a voltage drop enough to make the converter spit out really low voltage from the motor/generator type of converter.
It would seem like the machines need to have their own 230 1-phase and the converter needs its own 230 1-phase to help prevent this problem. Yet, most places I go to don't wire it this way.
WestKentucky
Member
Why not done yet??? Ya know these one off thingamajigs shouldn't be that tough, I mean seriously guys you only have to make one of them...
Sucks your killing your PS on the lathe.
Sucks your killing your PS on the lathe.
200Apples
Mojave Lever Crew
.
Having spent some time as a novice on a mill and an engine lathe... I'm still! bowled over bythe massive amount of toolmaking experience required to create this 1/2-scale arm by "hand". Bravo!
If I may deviate slightly, Browning makes an 85%-sized 1911. I had to have one. (it needs better sights! just like the G.I. pistols it is modeled after). Point being, with the interest shown in this thread, I can't understand why more folks do not avail themselves of the neat, tiny Browning...
Again, MachIV, what you're doing is fantastic!
Having spent some time as a novice on a mill and an engine lathe... I'm still! bowled over bythe massive amount of toolmaking experience required to create this 1/2-scale arm by "hand". Bravo!
If I may deviate slightly, Browning makes an 85%-sized 1911. I had to have one. (it needs better sights! just like the G.I. pistols it is modeled after). Point being, with the interest shown in this thread, I can't understand why more folks do not avail themselves of the neat, tiny Browning...
Again, MachIV, what you're doing is fantastic!
OP
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MachIVshooter
Member
Actually............................................
I don't have the kind of experience I expect a lot of folks think I do. Up until June of this year, my equipment was limited to a Harbor Freight mini mill and mini 7x10 lathe, and a very small selection of tooling.
I made a few small things here and there, but it wasn't until January of this year that I really started getting into it, as a result of broken parts on some of my RC cars for which a strong enough commercial replacement wasn't available. It started out with A-arms and mounts:
Then moved on to some more complex pieces like hub carriers, my own design for electric conversion mounts, brake calipers for another custom build, etc:
Cut my teeth on carbon fiber doing a custom 4mm thick chassis for this RC-10, as well as a 6061-T651 two-into-one nose brace and a number of other small parts:
I had started buying more tooling, quickly discovering that a drill press vise and a set of HF end mills wouldn't cut it, but the biggest limitation really was the mill itself. I was figuring out how to deal with it, though, equipping it with DROs, a decent 4" tilt/swivel vise, learning how to hold tolerances with a machine that has a lot of movement, and also getting a better grasp on speeds and feeds. The last project on the little critter was a micro V8 engine block, which was never meant to run, just proof of concept:
I had been acquiring more tooling through the spring, scoring some eBay deals on cutter lots, measuring tools, etc.
Then in June, we moved in the big Lagun FTV2, which came with a 6" Palmgren vise. I promptly scored the Troyke DMT12 table, and began learning the ins and outs of a larger machine, and all the ways one can use a rotary. I played with it a bit through the summer, and I knocked out some 80% lowers, but this is honestly my first major project on this machine, and my first gun build aside from some cobbled together muzzle loaders and single shots.
I have never had any formal training, but as I mentioned earlier in this thread, I've been working with metals for 20 years. I just did it the shade tree way most of that time, with drill presses, bench grinders, hack saws, die grinders, files, etc. Was able to turn out functional things, but without the proper equipment, complex parts with tight tolerances are just not really possible.
This will certainly not be my last gun build, and as I do gain more experience, I'll pick up speed, develop more efficient orders of operations, and stop making so many mistakes-namely the ones that kill cutters. I also intend to do a running V8 engine about double the size of the micro pictured above. That'll be a bigger challenge than this project, though.
I do feel that I have a certain gift for this stuff, but I also still have a lot to learn. I'm mostly self taught, but I have a good friend who is a machinist by trade, and the resources out there on the internet have been very helpful.
I guess the point I'm trying to make is that if you have a mechanical mind and apply yourself, machining isn't rocket surgery, and you don't need professional training-just a willingness to invest the time and money, and to learn what you can from others and not become overly frustrated by your mistakes. I've broken a lot of tooling and scrapped a lot of pieces figuring out what works and what doesn't.
SleazyRider
Member
I appreciate your modesty, but politely and most respectfully beg to differ. I am by no means a machinist, but I remain in awe of the intelligence and abstract thinking skills of competent machinists. The ability to confront a problem, then conceive of a solution for said problem, and finally, solve the problem by fabricating a mechanical device represents the highest form of intelligence, an opinion shared by many psychologists. Anybody can talk the talk; a machinist walks the walk, which demands innate higher-order thinking skills as well as education.
My hat is off to you, sir.
bhhacker
Member
The only thing i can think of adding to this thread by you is this....If you sell it is it going to be half price?
....
So, wait a minute. You're not even a machinist by trade and you're taking this on (and conquering it mightily if I say so myself)?????
And you are learning as you go?
Wow.
Heartfelt congratulations for finding your true calling in life, sir.
I have long postulated that every human being has a "gift" for something, whether it is music, art, a skill of some sort, or a trade. (This is Trent's Postulation #1, and why I encourage everyone I am friends with to "always try new things!!!!")
The sad reality is most people never find their "gift."
For me it was computers, and I was lucky enough to discover it at the early age of 7 when I taught myself 6502 assembly language. (!)
I kind of suck at everything else in life though! :banghead:
Which brings me to Trent's Postulation #2; the greater the gift we have in that "one thing", the worse we are at everything else.
Anyway congrats on finding that "thing" that really makes you unique, man. You need to take this innate ability and fly with it. Seriously.
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