Author Topic: This Is What Can Happen..... (Read 163654 times - 1 votes)
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rsterne · « **Reply #340 on:** February 14, 2016, 01:21:38 PM »

If you think all HiPacs are created equal, I strongly suggest you go back and read post #316 on page 16.... some of them have very little thickness below the O-ring groove, and are subject to failure at that point.... I have no idea if this issue has been addressed by the manufacturer.... He has been quoted as saying that the minimum thickness should be 1mm (0.039") and there are several examples documented in this thread that are thinner.... I'm glad there are lots of happy customers.... I hope you don't have one of the thin ones....

Bob

Canadianguy55 · « **Reply #341 on:** February 14, 2016, 01:53:26 PM »

I have 2 hipac with extensions a course threaded hipac i don't use which is 0.033! So this one is under the min specs!I need to get around and measure my fine threaded one.

Your measuring the o ring grove right?i would like to know if I'm measuring the right spot!

Greg

Gerard · « **Reply #342 on:** February 14, 2016, 02:23:51 PM »

The bottom of the O-ring groove is the thinnest spot, so yes, that's the most worrisome and the one you need to check to ensure it's thick enough to resist snapping off if it gets torqued accidentally or just fails under fatigue under high pressure.

rsterne · « **Reply #343 on:** February 14, 2016, 03:33:52 PM »

I'm not saying that 0.039" is "safe" at any given pressure, just that is what "I heard" the manufacturer claimed was the minimum spec. at that point.... I have no idea what the material is, nor what effect "torqueing" the tube with a sideways load does to the stress on it.... The way to determine the thickness (on a degassed tube, obviously) is to measure the ID of the tube at the O-ring groove, and subtract that from the OD measured at the bottom of the O-ring groove.... Dividing that by 2 will give you the wall thickness, PROVIDED the groove is centered relative to the tube ID.... which is actually very unlikely.... Most machining operations of that type would not produce a uniform wall thickness all the way around, unless that was specified on the drawings, and checked for under strict quality control.... Therefore, even if your dimensions were different by 0.080", that is no guarantee that the wall thickness is not under 0.039" on one side of the groove....

Bob

Canadianguy55 · « **Reply #344 on:** February 14, 2016, 03:54:52 PM »

Ok....I understand that,isn't the o ring grove the same OD top or bottom?I' must be missing something..

rsterne · « **Reply #345 on:** February 14, 2016, 04:00:26 PM »

By "bottom" I mean the diameter at the smallest point, where the O-ring sits.... ie not the outside of the tube that the groove is cut into.... Where it snapped off in the pics on post # 316 on page 16....

Bob

Canadianguy55 · « **Reply #346 on:** February 14, 2016, 04:03:36 PM »

Gotcha yeh!I wish I could afford a regulated air rifle instead of worrying about this *&^&# lol

Thanks Bob

Buldawg76 · « **Reply #347 on:** February 15, 2016, 02:12:50 AM »

I will have to agree with Rsterne as no two hipacs are created equal so if in doubt measure twice to be safe but I myself will not use any ever made again regardless if the issue has been addressed or not since the one Lloyd showed that broke under slight side loads by him on his lathe was mine and had I known the thin area under the o ring I would have never paid the money I did for them and is why I had custom tubes made that I can feel safe using myself and for my grandkids to use as well.

Buyer beware is all I can say.

Mike

Iamscotticus · « **Reply #348 on:** February 20, 2016, 01:46:14 PM »

Degas your gun before wrenching on it

vigilandy · « **Reply #349 on:** February 20, 2016, 07:29:19 PM »

Quote from: buldawg76 on February 15, 2016, 02:12:50 AM

I will have to agree with Rsterne as no two hipacs are created equal so if in doubt measure twice to be safe but I myself will not use any ever made again regardless if the issue has been addressed or not since the one Lloyd showed that broke under slight side loads by him on his lathe was mine and had I known the thin area under the o ring I would have never paid the money I did for them and is why I had custom tubes made that I can feel safe using myself and for my grandkids to use as well.

Buyer beware is all I can say.

Mike

I hear you Mike. I've got two HiPacs and four extensions that measure 0.033—0.035 at the oring groove. I bought them right before seeing the info about your HiPac. Buyer beware is right. I ended up ordering a customized tube from Roy Weid for my project.

Canadianguy55 · « **Reply #350 on:** February 20, 2016, 07:40:16 PM »

I hear you Mike. I've got two HiPacs and four extensions that measure 0.033—0.035 at the oring groove. I bought them right before seeing the info about your HiPac. Buyer beware is right. I ended up ordering a customized tube from Roy Weid for my project.
[/quote]

I have the same deminsions as you!Is there someone out there that makes these customized tubes?

rsterne · « **Reply #351 on:** February 20, 2016, 09:02:31 PM »

How about returning them to the manufacturer for a replacement that is within tolerance?.... or did you try that and he refused?....

Bob

tkerrigan · « **Reply #352 on:** February 21, 2016, 04:17:48 AM »

I just went out and measured one of mine that has an extension. One groove is .035" wall thickness and the other is .0285". It does appear that if done properly, a steel sleeve could be epoxied on the inside to equal the proper thickness or a bit better, and you wouldn't loose that much air. Regards, Tom

lloyd-ss · « **Reply #353 on:** February 21, 2016, 08:54:50 AM »

Quote from: tkerrigan on February 21, 2016, 04:17:48 AM

I just went out and measured one of mine that has an extension. One groove is .035" wall thickness and the other is .0285". It does appear that if done properly, a steel sleeve could be epoxied on the inside to equal the proper thickness or a bit better, and you wouldn't loose that much air. Regards, Tom

Tom,
that might be a reasonable idea if other options are exhausted. A 1/16 wall sleeve maybe 1-1/2 inch long with .004 to .008 total clearance for the glue line, good fresh epoxy, and most important, 100 percent coverage and proper mixing and curing. However, i think i would only consider it as additional reinforcement on a good unit, not as a fix for a marginal unit. This is playing with fire.

Buldawg76 · « **Reply #354 on:** February 24, 2016, 09:36:33 AM »

Quote from: rsterne on February 20, 2016, 09:02:31 PM

How about returning them to the manufacturer for a replacement that is within tolerance?.... or did you try that and he refused?....

Bob

Bob
I called the manufacture of them with my concerns over severe leakage and he said he would replace them but when I asked if he had fixed the issue of the threads on the male ends running all the way to the end of the extensions with no relief for the o ring to be captured and seal properly he said there was no issue with that and the new ones would not be any different in that respect.

Then when I asked about the coarse and fine thread versions and requested I receive the fine thread versions in exchange I was told I would get what I was sent and could not demand a certain style as a replacement. Since it was MY money he was getting ( should read he already had, 230 bucks worth ) I felt I did have the right to request what I wanted.

So since he was neither responsive or truly concerned that I was satisfied and happy with my purchase. I chose to take my business elsewhere and get parts that were of the highest quality and have had no issue with to this day. Lesson for the day as I am out 230 bucks is do your homework first and research reviews as much as possible.

I was not able to really do that since they were very new to the market when I bought mine and very little was available or known as far as their quality or actual performance in real world conditions.

Same old motto " buyer beware "

I know now for what I had invested in the hipacs and subsequent replacement tubes I had made I could have bought some disco tubes and internals and had just what I wanted for less money and more air capacity as well as better performance to boot.

Mike

cilami · « **Reply #355 on:** March 02, 2016, 10:48:17 AM »

FWIW,

http://www.network54.com/Forum/665650/message/1456361493/The+rat+on+the+website-

rsterne · « **Reply #356 on:** March 02, 2016, 12:30:50 PM »

From that link....

Quote

Apparently my machinist drilled a lot of them (extensions?) with a bigger bore than the design which thinned the o-ring channel. As you read you'll hear what you hear, so for comfort sake here it is. The o-ring channel OD 0.672". ID is 0.578" for a grand difference of 0.094" or .047 wall thickness, which ain't a problem, as the AG gods profess their expertise in all things AG related. Funny that nobody"s asked to return them. Go figure.

I don't know why the Forums should have to do the Rat's work for him.... but this appears to be an admission that some HiPacs (and/or Extensions) have a wall thickness under the O-ring groove less than 0.047", which "ain't a problem", according to the manufacturer.... SOOOOOOOOOOOO.... now we have an "official" tolerance, below which it appears that you should return your HiPac and/or Extension, as suggested above....

As to the comment that "Funny that nobody's asked to return them. Go Figure.".... perhaps if there had been an admission that there was indeed a problem with some HiPacs and/or Extensions instead of months of denial.... we could have laid this matter to rest a LOONNNGGGG time ago.... JMO.... In any case, if you missed it.... I repeat what I read from the above, from the Rat's Forum....

IF YOUR HIPAC and/or EXTENSION MEASURES LESS THAN A 0.047" WALL THICKNESS.... A TOTAL OF 0.094" DIFFERENCE BETWEEN THE BOTTOM DIAMETER OF THE O-RING GROOVE AND THE ID OF THE TUBE.... RETURN IT TO THE MANUFACTURER FOR A REPLACEMENT !!!

As an aside, I tried going to the HiPac website.... http://www.powermax-hipac.com/ ..... It appears to have disappeared.... Does anyone know if they have gone out of business?....

Bob

sixshootertexan · « **Reply #357 on:** March 02, 2016, 01:51:54 PM »

http://www.powermaxhipac.com/

Gerard · « **Reply #358 on:** March 02, 2016, 02:07:48 PM »

Not sure why you've posted his home page Texan, but here's the page where he's saying most models are discontinued until further notice due to a manufacturing error:

http://www.powermaxhipac.com/5--hipac-s.html

sixshootertexan · « **Reply #359 on:** March 02, 2016, 04:11:48 PM »

The link Bob posted is out of date. I posted the new link.

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This Is What Can Happen.....

Author Topic: This Is What Can Happen..... (Read 163654 times - 1 votes) )

Author Topic: This Is What Can Happen..... (Read 163654 times - 1 votes)
)