Bought NEA-15 upper, Doesn't fit.........
- Thread starter bsand
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You have no idea what you are talking about. CNC machines do not get "calibrated". And I work on CNC machines and set them up 5 days a week, I have no idea how a CNC gets "out of alignment"either. Please refrain from posting about things of which you clearly have no knowledge or experience.
So CNC machine doesn't break down? the parts on a CNC machine doesn't wear out and need to be replaced? no preventative maintenance? CNC service technician must be lonelier than a Maytag repairman.
CNC can get out of alignment (like spindle run out) by simply crash it hard enough.
Also wear and tear on ball screw may need backlash compensation.
But NEA's problem is they still couldn't develop a repeatable and robust machining process.
The part on the jigs not always the same spot, out of positions between operations etc
That is only two parts here the upper and lower and made out of 6061.
If they cannot even handle 6061 then forget about other materials.
Runningfool
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Their uppers and lowers are forged now so the CNC discussion is moot.
Sorry, thought I'd read every post in this thread more than once. Not sure how I missed that.
You still need machining on the forged parts....machining that is still done via CNC machines, so no, not moot.
This is what I mean. If they couldn't get the spacing between the Iug correct in a mass produced part, what else didn't they get right? They obviously have zero QC.
Parts "wearing out" is not calibration. Again you have no idea what you are talking about. None of the things you are talking about can cause multiple parts to be bad We run 8 CNC lathes and 2 CNC mills 16- 20 hours a day where I work. I might have a millwright in the shop once a year PER MACHINE. For the love of pete, stop spewing this utter BS. CNC machines are so reliable they are boring, If they broke down all the time like you claim, no one would use them because they wouldn't make any money.
Not even close. Forged parts have to be finish machined, on, you guessed, it CNC mills and lathes. Google a picture of the forging that an AR upper is made from, or the lower. The only way that part turns into a usable AR component is by machining.
+1 in some cases, I own and operate 3 CNC machines, all Japanease made top of the line stuff. Been doing it 16 years now, and today I am actually taking one of my spindles off for a bearing rebuild, they aren't toast yet but they are getting loud and have a very little runout. The machine runs 5 days a week 6am-8pm, its a 7 years old, earlier this year I had one of the ball screws rebuild. So yes they do need maintenance from time to time to keep running at tolerance limit's.
And it also depends on how much money you spend on the machine and where it is made, my machines cost roughly $270,000 each and are tier one brand names made in Japan. I could buy the same size machine made in Tiawan of %25 the cost of my Jpanease machines. They would not last as long, or have anywhere near the same tolerance for the same amount of time IMO....Some companies buy a machine just to run parts till it breaks, other companies buy better brand and quality equipment for the long run and to make parts at higher tolerances and hold those tolerances longer
Ive seen it both ways, there is more to it then the machine, its ultimately the companies choice to what tolerance they will allow their stuff go out the door. And then you get into quality control, even if the machine is out of spec why are you letting the parts that it made out of spec out the door for the full price.
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RememberTheSomme
CGN Ultra frequent flyer
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NEA must be using Dremel 606's or flat bastard 233's.
seriously though,.....I own an AR15 built on NEA upper, lower, 10.5" barrel and now the F/A BCG as well. I tried the NEA upper on the M15A4 last night no problems and the M15A4 upper on the NEA no problems. Is the problem the NEA rail itself in all these cases or the lower and rail both???? I'm using a YHM rail is that why no interchangeability problems??.
seriously though,.....I own an AR15 built on NEA upper, lower, 10.5" barrel and now the F/A BCG as well. I tried the NEA upper on the M15A4 last night no problems and the M15A4 upper on the NEA no problems. Is the problem the NEA rail itself in all these cases or the lower and rail both???? I'm using a YHM rail is that why no interchangeability problems??.
The rail itself contacts the pivot pin hole bosses on the lower, preventing it from aligning properly. NEA lowers fit fine, due to the fact they use less material around the pivot pin holes, so they fit. Skinnier, if you will. Check my thread (listed on page 1 or 2 of this thread), I posted pics.
My first issue was the hand guard contacting the pivot pin ears. Then after removing said rail, the pivot pin fit, but the take down pin wasn't seating. Hence removing the detent and takedown pin. It was then. That I realized that the lower was out of spec.
I should have done research. Too quick to buy...
Looks like a polymer80 lower... I'll tell yea from experience that they are not in spec. The take down pin holes will not line up with a mil spec upper consistently. I bought one of those lowers as a cool project, but in the end I was very unhappy with the product. I ended up getting a cheap DPMS lower and it looks better and will last longer.
Ya it didn't fit on my bushmaster either.
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