On Sunday 04 December 2016 04:03:13 Gregg Eshelman wrote: > For crimping IDC's onto ribbon cables, even 50 wire for narrow SCSI, I > just use my bench vise with a careful hand on the handle.
I've never used anything else. But I have found I've had to go back and put more squeeze a time or 2. Darned vise jaws have a cross-hatch pattern and I usually use a couple pieces of thin wood for padding. A 50 way connector can take quite a squeeze, and needs it. I lost the mist control function not often used on the g0704 about a year ago, and couldn't find it at the control box but a halmeter on the pin said it was working. That left the cable which had db25's on both ends. I could see a tiny gap between the cable and the connector body, so back to the vise and printed the metal d-sub pattern 50 thou into a piece of white pine 1 by. No more gap, no more problem. The cheaper, all plastic db25 connectors can take lots more pressure, so thats what I bought the last time. So far, they've just worked, and well. But with this new build, using the r-pi 3b/7i90HD combo, its an spi interface. And apparently spi hasn't an industry std connector yet, so I am stuck with these worthless female to female jumpers. Everyone I've used so far had to have its contact leaf crushed with a teeny punch before the connection worked and stayed put while I was inserting the next one with a set of 4" curved suture clamps. Same problem hooking up the 7i90's I/O. I bought an 80 pack, found they were useless, bought another 80 pack from a different place. Identical crap. How long they will hold a good connection after being squeezed some more is anybodies guess. What puzzles me about spi is that it can apparently access two loads as it has the equ of 2 chip-selects, or is that the direction control? I've not sorted that out yet, and thats not helped by the raspi calling a signal by a different name than the 7i90 calls it. Not quite Swahili abbreviations on one end and Lower Elboneon on the other, but thats a good example. :) Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
