Spehro Pefhany wrote:> On Tue, 01 May 2007 23:37:12 GMT, the renowned Joerg > <notthisjoergsch@removethispacbell.net> wrote: > > >>Spehro Pefhany wrote: >> >> >>>On Tue, 01 May 2007 09:01:13 -0700, the renowned Joerg >>><notthisjoergsch@removethispacbell.net> wrote: >>> >>> >>> >>>>Digikey is out. They are out of stock on a lot lately, had a real hard >>>>time assembling the last part list. I would go to Mouser instead but >>>>their search "feature" is the pits. That costs them more business than >>>>they'll ever know. >>> >>> >>>You really appreciate how *good* most of the electronics sites are >>>when you have to use some of the mech ones. One mold component maker, >>>for example, has 3D models of many of their parts. The interface is >>>insanely clumsy- for example you can search by their names such as >>>"Jiffy Tite" (if you can remember them exactly) but cannot search by >>>their part numbers-- otherwise you have to drill down through their >>>entire catalog for each part (of course it's a *different* catalog >>>from the online part catalog, which, in turn, is modelled after their >>>print catalog in sort-of logical sections rather than being >>>searchable). They (DME) are one of the biggest suppliers and it's >>>pretty awful. Then there is Hasco. One of their salesman told me today >>>that he has no problems (but, of course, he uses the German catalog). >>> >> >>Did you try these guys? >> >>http://www.mcmaster.com/ >>http://www.grainger.com/Grainger/wwg/start.shtml >> >>Their sites are ok, for the most part. But I have only needed rather >>mundane stuff, don't know how it would be for real boutique parts. > > > The above-mentioned sites are decent (like Digikey, useful as > references too), but they just don't carry such specialized parts. > Once you get beyond adequate quality SH cap screws and O-rings, they > fizzle out quickly. Here's a view of a 3D model of a portion of a mold > I designed: > > http://server2.hostingplex.com/~zstoretr/manifold_assembly.jpg > > You can see titanium spacers, a special copper alloy sprue bushing, > leader pins, titanium tubular dowels, and such like even in just a > simple couple of plates. > >Cool! But electrical engineers aren't s'posed to do that stuff :-) -- Regards, Joerg http://www.analogconsultants.com
Real Time Clock Hardware
Started by ●April 30, 2007
Reply by ●May 2, 20072007-05-02
Reply by ●May 2, 20072007-05-02
jasen wrote:> On 2007-05-01, Joerg <notthisjoergsch@removethispacbell.net> wrote: > > >>>For test fixtures and personal stuff, I really like >>>waxed dental floss. I'd be concerned about using >>>it in production or flight hardware. >>> >> >>Now that's an idea. I don't floss, we use ultrasonic brushes so I don't >>know about that stuff. > > >>What kind should I get > > > Unscented! >ROFL!> > I've seen waxed thread used in leatherwork, try a craft store, or saddlery. > > Bye. > Jasen-- Regards, Joerg http://www.analogconsultants.com
Reply by ●May 2, 20072007-05-02
Spehro Pefhany wrote:> On Wed, 02 May 2007 14:32:05 GMT, the renowned Joerg > <notthisjoergsch@removethispacbell.net> wrote: > > >>>You can see titanium spacers, a special copper alloy sprue bushing, >>>leader pins, titanium tubular dowels, and such like even in just a >>>simple couple of plates. >>> >>> >> >>Cool! But electrical engineers aren't s'posed to do that stuff :-) > > > I'm always doing stuff I'm not supposed to. ;-) > > At least it has a bit of electricals in it (connectors, heaters and > thermocouples). >Reminds me of a friend who had to do a field repair in Australia. When he arrived the panel of the control box was already off. So he fixed it. Then he closed the box by mounting the panel. BIG mistake. He was read the riot act by a high-level manager. "What were you thinking?! That was the job of the mechanic and he belongs to another union and now we'll be in hot water there..." -- Regards, Joerg http://www.analogconsultants.com
Reply by ●May 2, 20072007-05-02
On Wed, 02 May 2007 14:32:05 GMT, the renowned Joerg <notthisjoergsch@removethispacbell.net> wrote:>> You can see titanium spacers, a special copper alloy sprue bushing, >> leader pins, titanium tubular dowels, and such like even in just a >> simple couple of plates. >> >> > >Cool! But electrical engineers aren't s'posed to do that stuff :-)I'm always doing stuff I'm not supposed to. ;-) At least it has a bit of electricals in it (connectors, heaters and thermocouples). Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
Reply by ●May 2, 20072007-05-02
In message <Ey2_h.4869$uJ6.3135@newssvr17.news.prodigy.net>, Joerg <notthisjoergsch@removethispacbell.net> writes>>>What kind should I get >> Unscented! >> > >ROFL! >Get the mint stuff if your equipment is likely to be used by smokers, makes it much more pleasant for the service techs. -- Clint Sharp
Reply by ●May 2, 20072007-05-02
Joerg wrote:> Jim Stewart wrote: > >> Joerg wrote: >> >>> martin griffith wrote: >>> >>>> On Mon, 30 Apr 2007 13:00:37 -0700, in comp.arch.embedded Joerg >>>> <notthisjoergsch@removethispacbell.net> wrote: >>>> >>>> C is going to be handled. SPI? I2C? Other? >>>> >>>>> Talking about high-tech here: Does anyone know where to get wax >>>>> rope for making cable harnesses? Couldn't find it on Digikey or >>>>> Mouser. Or am I just too freaking old? >>>> >>>> >>>> >>>> http://uk.farnell.com/jsp/Cable/Cable+Accessories/PRO+POWER/81400000/displayProduct.jsp?sku=3058669 >>>> >>>> http://uk.farnell.com/jsp/Cable/Cable+Accessories/ALPHA/LC+134+500YDS+WHT/displayProduct.jsp?sku=1213871 >>>> >>>> last one if from Newark >>>> >>> >>> Ah, thanks! Didn't know it was called lacing cord these days. We used >>> to call it wax rope or harness cord. Digikey is out but Mouser has >>> that as well. They even got it in black, I only knew the white stuff. >>> Cool. 10c/yard is kind of highish but those 500 yards will last a >>> long time. >> >> >> >> Most aircraft supply shops carry Koroseal >> lacing cord. It's still used for behind- >> the-panel avionics lacing. >> > > Aha! Cool. Because we have a local runway almost next to the house so I > could waltz over there and see if they've got any. > > I have seen <20 year old harnesses where half of the tie wraps have > failed and their pieces were flying about in the bottom of the box. That > would absolutely not be a good thing in an aircraft. In contrast I have > never seen a harness where lacing has failed and some were north of 50 > years old. >I remember laced cable trays from my days in Telco. It was considered a fine art to have 3-4 layers of cables in a tray, all neatly tied down with no kinks or crossovers. Of course, they were paying the price for all that craftsmanship! They were converting the office from the old SxS equipment, which was expected to last for centuries to electronic gear with lifetimes of decades. The new equipment was expected to change too often to tie down the cables, so the new paradigm was to have a the cables loosely laid in what can best be described as a rat's nest over the racks. To get to the frame, they ran new cable trays above the old ones, and just laid the new cables any which way in the tray. Then, as soon as the equpipment was switched over, they cut up all that nice laced up cable for recycling... :-( Charlie
Reply by ●May 2, 20072007-05-02
In message <SB2_h.6957$rO7.1033@newssvr25.news.prodigy.net>, Joerg <notthisjoergsch@removethispacbell.net> writes>Reminds me of a friend who had to do a field repair in Australia. When >he arrived the panel of the control box was already off. So he fixed >it. Then he closed the box by mounting the panel. BIG mistake. He was >read the riot act by a high-level manager. "What were you thinking?! >That was the job of the mechanic and he belongs to another union and >now we'll be in hot water there..." >LOL, and that's what killed the UK computer industry. Electrical crew to isolate the equipment, mech team to remove the equipment from the rack, tech to fault find, wireman to solder the bits in, tech to test and qualify, rinse and repeat, re-assembly was the reverse of disassembly in the tradition of the best auto manuals. Unions sucked ass big time until they got their nuts crushed by a certain woman in the 80s. -- Clint Sharp
Reply by ●May 2, 20072007-05-02
Charlie Edmondson wrote:> Joerg wrote: > >> Jim Stewart wrote: >> >>> Joerg wrote: >>> >>>> martin griffith wrote: >>>> >>>>> On Mon, 30 Apr 2007 13:00:37 -0700, in comp.arch.embedded Joerg >>>>> <notthisjoergsch@removethispacbell.net> wrote: >>>>> >>>>> C is going to be handled. SPI? I2C? Other? >>>>> >>>>>> Talking about high-tech here: Does anyone know where to get wax >>>>>> rope for making cable harnesses? Couldn't find it on Digikey or >>>>>> Mouser. Or am I just too freaking old? >>>>> >>>>> >>>>> >>>>> >>>>> http://uk.farnell.com/jsp/Cable/Cable+Accessories/PRO+POWER/81400000/displayProduct.jsp?sku=3058669 >>>>> >>>>> http://uk.farnell.com/jsp/Cable/Cable+Accessories/ALPHA/LC+134+500YDS+WHT/displayProduct.jsp?sku=1213871 >>>>> >>>>> last one if from Newark >>>>> >>>> >>>> Ah, thanks! Didn't know it was called lacing cord these days. We >>>> used to call it wax rope or harness cord. Digikey is out but Mouser >>>> has that as well. They even got it in black, I only knew the white >>>> stuff. Cool. 10c/yard is kind of highish but those 500 yards will >>>> last a long time. >>> >>> >>> >>> >>> Most aircraft supply shops carry Koroseal >>> lacing cord. It's still used for behind- >>> the-panel avionics lacing. >>> >> >> Aha! Cool. Because we have a local runway almost next to the house so >> I could waltz over there and see if they've got any. >> >> I have seen <20 year old harnesses where half of the tie wraps have >> failed and their pieces were flying about in the bottom of the box. >> That would absolutely not be a good thing in an aircraft. In contrast >> I have never seen a harness where lacing has failed and some were >> north of 50 years old. >> > I remember laced cable trays from my days in Telco. It was considered a > fine art to have 3-4 layers of cables in a tray, all neatly tied down > with no kinks or crossovers. > > Of course, they were paying the price for all that craftsmanship! > > They were converting the office from the old SxS equipment, which was > expected to last for centuries to electronic gear with lifetimes of > decades. The new equipment was expected to change too often to tie down > the cables, so the new paradigm was to have a the cables loosely laid in > what can best be described as a rat's nest over the racks. To get to > the frame, they ran new cable trays above the old ones, and just laid > the new cables any which way in the tray. > > Then, as soon as the equpipment was switched over, they cut up all that > nice laced up cable for recycling... :-( >Sad. There are good reasons why lacing is still required in many mission-critical applications. When looking at aircraft cable harnesses it becomes quite obvious why. When I did wax rope lacing I didn't think it took me longer than "modern" methods. It's probably an acquired art just like knitting. I still don't understand how my wife juggles those needles. -- Regards, Joerg http://www.analogconsultants.com
Reply by ●May 2, 20072007-05-02
Charlie Edmondson wrote:> Joerg wrote: > >> I have seen <20 year old harnesses where half of the tie wraps have >> failed and their pieces were flying about in the bottom of the box. That >> would absolutely not be a good thing in an aircraft. In contrast I have >> never seen a harness where lacing has failed and some were north of 50 >> years old. >> > I remember laced cable trays from my days in Telco. It was considered a > fine art to have 3-4 layers of cables in a tray, all neatly tied down > with no kinks or crossovers. > > Of course, they were paying the price for all that craftsmanship!Seen some installations where a group of 9 cables (~100 pairs each) were box-laced together and were free standing vertically from the ground floor to the 1st floor part of the exchange. These cables fanned at the top of the stand. True art. -- ******************************************************************** Paul E. Bennett ....................<email://peb@amleth.demon.co.uk> Forth based HIDECS Consultancy .....<http://www.amleth.demon.co.uk/> Mob: +44 (0)7811-639972 Tel: +44 (0)1235-811095 Going Forth Safely ..... EBA. www.electric-boat-association.org.uk.. ********************************************************************
Reply by ●May 2, 20072007-05-02
Joerg wrote:>> You can see titanium spacers, a special copper alloy sprue bushing, >> leader pins, titanium tubular dowels, and such like even in just a >> simple couple of plates. >> >> > > Cool! But electrical engineers aren't s'posed to do that stuff :-)Those of us who are "Systems Engineers" do have to do that stuff as well as the electrical, electronics and software. I also do:- Ultra High Vacuum Cryogenics Transport Logistics COSHH Assessments DSEAR Assessments Microwave Plumbing Water Systems Plumbing Carpentry Model Making Librarian Document Registrar Finance Manager Mechanical Assembly -- ******************************************************************** Paul E. Bennett ....................<email://peb@amleth.demon.co.uk> Forth based HIDECS Consultancy .....<http://www.amleth.demon.co.uk/> Mob: +44 (0)7811-639972 Tel: +44 (0)1235-811095 Going Forth Safely ..... EBA. www.electric-boat-association.org.uk.. ********************************************************************
