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| Test Equipment Anonymous (TEA) group therapy thread |
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| mnementh:
--- Quote from: AVGresponding on July 01, 2022, 03:31:32 pm --- --- Quote from: mnementh on July 01, 2022, 03:19:01 pm ---...You should try to avoid having your second crimp overlap the first; this ensures that the wedge/plug you're talking about forms BETWEEN the two crimps, and the second crimp really is only "for good measure". mnem Oh, and right on aboot the fly... that made for some good cinema there. :popcorn: --- End quote --- You shouldn't crush the wedge at all. Copper has a very low elastic limit, and if you do that you lose the benefit of having a wedge. --- End quote --- The wedge does form if you do the 2nd crimp far enough away; it forms between the 2 crimps. A mm wide and deep (less, really) is all the wedge needs be to provide more than adequate mechanical strength. When I talk of the 2nd crimp being "for good measure" it is to increase the contact area under compression for lowest resistance, not mechanical strength. These are not brake cables or the like; mechanical strength does not need to be that much in engineering terms to be stronger than any mechanical stress it should ever experience. mnem :blah: |
| mnementh:
54621D is here. :-+ mnem *disappears into the dwagon-cave* |
| AVGresponding:
--- Quote from: mnementh on July 01, 2022, 04:28:18 pm --- --- Quote from: AVGresponding on July 01, 2022, 03:31:32 pm --- --- Quote from: mnementh on July 01, 2022, 03:19:01 pm ---...You should try to avoid having your second crimp overlap the first; this ensures that the wedge/plug you're talking about forms BETWEEN the two crimps, and the second crimp really is only "for good measure". mnem Oh, and right on aboot the fly... that made for some good cinema there. :popcorn: --- End quote --- You shouldn't crush the wedge at all. Copper has a very low elastic limit, and if you do that you lose the benefit of having a wedge. --- End quote --- The wedge does form if you do the 2nd crimp far enough away; it forms between the 2 crimps. A mm wide and deep (less, really) is all the wedge needs be to provide more than adequate mechanical strength. When I talk of the 2nd crimp being "for good measure" it is to increase the contact area under compression for lowest resistance, not mechanical strength. These are not brake cables or the like; mechanical strength does not need to be that much in engineering terms to be stronger than any mechanical stress it should ever experience. mnem :blah: --- End quote --- You haven't seen how some "engineers" rag on cables connecting big batteries in big strings... you'd think the prospect of instant death if there's a serious short would moderate their behaviour, but as the old saying goes "familiarity breeds contempt". If you do the arithmetic, you'll see that even a single crimp will have more surface contact area than the cable CSA. I'm not saying it's inherently bad, I'm just saying I prefer the guaranteed mechanical strength over the possible few nano-ohms difference a second crimp makes. Mostly these things will only make a difference in edge cases; I routinely "crimp" 10-95mm2 lugs with my trusty 2PH and a hammer (only if I don't have a proper crimper to hand and it needs to be done NOW. Bigger than 95mm2 and I need a hydraulic crimper which I don't have, so those have to wait until it gets hired). Haven't burned any buildings down yet. ??? |
| Neomys Sapiens:
--- Quote from: Messtechniker on July 01, 2022, 12:20:12 pm ---What kind of soldering (station?) are you using for thick cables? Our everyday 80 W soldering station wont cut it, right? --- End quote --- I've got the Weller WSD151 with the WSP150 iron,but I found that the high-capacity tips for the WSP80 cover most situations well.In the company we have a special JBC (HDE+T470) with up to 250W. But both aquisitions were motivated more by SMD power electronics and RF connectors than cables. |
| factory:
--- Quote from: vk6zgo on July 01, 2022, 05:55:08 am --- --- Quote from: Cubdriver on July 01, 2022, 02:50:52 am --- --- Quote from: cyclin_al on July 01, 2022, 02:02:29 am --- --- Quote from: factory on June 30, 2022, 07:55:01 pm --- --- Quote from: Cubdriver on June 30, 2022, 04:33:26 am --- --- Quote from: factory on June 29, 2022, 09:40:35 pm ---I thought you won one of the 180 series SA mainframes, in the last PP auction, it should work in the SA mainframe, just some of the later ones haven't got the scope cal outputs, as they were made long after the scope modules became obsolete. I'm I the only one on here with some 180 scopes in my collection? David --- End quote --- I have a 181 here. Lab Cat looking none too pleased with the poor probe compensation: -Pat --- End quote --- A quick warning note for anyone with a HP 181T, 181A oscilloscope mainframe or spectrum analyzer display section (or older 141T,141S,141A), beware there is no protection for the storage CRT with excessive intensity, particularly in normal mode, where you can't see the trace bloom with high intensity setting, the storage mesh is often damaged on these from previous owners not RTFM, or clueless sellers that just turn every control to max until a trace appears. :-BROKE Warning from 141T manual, need to add the 181 warning (aka, use Write & avoid Norm for setting intensity). Another warning, when buying unknown condition 180/181 series mainframes, check the PSU is working correctly, before trying with known good plug-ins, as there was a mention of damage to the plug-ins from a faulty PSU. Some of mine..... David --- End quote --- I noted the same warning in the Tektronix RM564 manual ... which I still have not got round to powering it up. Eventually.... some day --- End quote --- I just want to note for the record that that photo was taken in rather dim lighting, so the phone camera horribly overexposed the appearance of the trace on the scope - it wasn’t set to eye-searing, screen-melting intensity despite the fact that it may seem to be. Also note how bright the pilot light looks, and how dimly lit everything else is in comparison. No CRTs were harmed in the production of that photograph. :-+ -Pat --- End quote --- I guessed that you were trying to get the best possible picture of your fuzzy whiskered friend. --- End quote --- The comment about the storage CRT, was intended for those not familiar with these old analog storage CRT based scopes (not Cubdriver), I try to add it everytime these are discussed, to try and get the information out there, so it can help newcomers & clueless house-clearer/trader type ePay sellers. If I remember correctly, the 180series pdf manuals scanned by Agilent genitAl Technologies are complete unreadable shite, also the warning sticker is not always present. David |
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