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  • Users: mcgyvr
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  1. mcgyvr

    Material/Temper for Clip on Nut/Retaining Ring

    Could use a little help on material section and tempering information for a part I plan to design thats kind of a cross between a retaining ring and a clip on nut.. It will be stamped/formed (bent over in U shape) in a shape similar to a clip on nut as shown in the attached image and part of it...
  2. mcgyvr

    First Pass Yield

    In an electronic assembly process where you assemble a product and then perform a functional test would you include assemblies that are redirected for rework based on visual inspection failures before they even make it to the functional test in your FPY percentage? Or only products that fail the...
  3. mcgyvr

    Screw/Worm Hose Clamps on pneumatic lines

    I'm having some trouble finding if typical screw/worm drive hose clamps are allowed or not allowed to be used on pneumatic hoses for assembly tools in a typical assembly factory. Air pressure is 125psi max. We are using barbed fittings, 1/4" hose,etc.. and typical screw drive hose clamps with...
  4. mcgyvr

    Why 130VDC in utility/substations?

    Why are 130VDC battery banks commonly used in the utility/substation industry? Specifically wondering why the 130VDC? Why not 120V or 48V or whatever.
  5. mcgyvr

    Snap fit features for round through holes

    Just looking to see if anyone has any good links/design guides/feature details on snap fit features for locking into a round mating through hole. Like quarter round cantilever beams,etc... Got an injection molded part to design that needs to snap fit onto a circuit board that will have round...
  6. mcgyvr

    Crimp terminal reeling service?

    We have a "custom" screw machined terminal that we designed/use and were looking to see if anyone knows of a company that puts custom terminals onto a reel or tape or whatever so that it can be fed into semiautomatic crimping applicators/presses like an Amp G press. Volumes have increased...
  7. mcgyvr

    Anti-tie down required for air cylinder presses?

    Are two-hand "anti-tie down" controls required for simple mead/bimba type air cylinder (3" to 6" cylinder diameters @ 100psi) presses in the US (OSHA)? Right now we have a few simple staking machines from 20+ years ago that do have 2 hand controls but each of the buttons "could" be tied/taped...
  8. mcgyvr

    taper cutting bit??

    Is there such thing as a "taper cutting bit". Like a pencil sharpener I guess. Ive got an assembly fixture with a bunch of 1/8" plastic dowel pins sticking out of it. I would like to taper the end of these pins at the tip to allow the parts that fit over these pins to locate easier. This would...
  9. mcgyvr

    LM4128 2.5V reference problem

    Having a problem here.. I'm using the attached circuit to measure -75 to 75V and output it to 0-5V for sampling by a micro (2.5V -/+2.5V). Except instead of the 2.5V voltage as shown in the image I'm using a LM4128 2.5V series voltage reference. (personally never used a voltage reference chip...
  10. mcgyvr

    UL Not accepting ETL (or any other NRTL) testing to UL standards

    Anyone run across this before and can comment on what you have done? Our products are tested by ETL to UL standards (UL 60950 to be exact). Now our customer is putting our product into their complete system and attempting to get it UL listed BUT UL is rejecting our listing because it was not...
  11. mcgyvr

    Cleaning procedure/equipment lead wave solder machine

    Does anyone have a documented procedure or suggestions for the cleaning process of a wave solder machine that they are willing to share. Mainly info on wiping down surfaces involving lead dust, cleaning rag disposal, disposal of air filters embedded with lead dust,vacuuming,etc... As well as any...
  12. mcgyvr

    Nitrogen Dewer Leakage

    We just stated using nitrogen in a selective soldering application a few months ago. We have been getting dewar tanks that are roughly 5 feet high and 2 ft in diameter (3850 cubic feet I believe). I have a few questions. #1-Does the nitrogen naturally leak out of the tank when not in use? and if...
  13. mcgyvr

    Brass threaded stud failure

    Can anyone shed any light on why this threaded stud is failing? The manufacturer of this stud is looking into it but I'm looking for some additional insight. The part is brand new and installed in an indoor office type environment. This is happening during installation at the end users sites...
  14. mcgyvr

    PWM to control brushless 12VDC fan speed

    Looking for some help to control the speed of a brushless 12VDC (120mA) fan from a 0-5V 500Hz PWM signal. Here is the fan. http://www.newark.com/sunon/kde1204pkvx-ms-af-gn/axial-fan/dp/89K1822 I tried simply sending the PWM through a 220ohm resistor to the base of a transistor and 12vdc through...
  15. mcgyvr

    UL bus rating vs overcurrent device

    This just doesn't seem right to me and wanted to see what others think. We use a product (DC fuse panel) with a bus rating of 100A. Per UL we need to protect it with a max. 125A overcurrent device. However they only thermal test that product to the bus rating of 100A. With a 125A overcurrent...
  16. mcgyvr

    Fuse alarm schematic help

    See attached schematic for a fuse alarm circuit. This product uses 2 types of fusing. If only F1 blows the relay is energized, if only fuse 2 blows the relay is energized and D3 illuminates. The problem comes when fuse 1 and fuse 2 have blown. Due to the drops from the transistors/diodes fuse 1...
  17. mcgyvr

    Interlock 5 Amps at 50VDC

    Have an application that needs to interrupt a 5A (maybe 7A) load at 50VDC when a door is opened and reconnect when the door is closed. Cost is a large concern..need around a $5 solution. Have looked into a simple pushbutton/relay but they don't seem to be available past a 28VDC rating for any...
  18. mcgyvr

    Chemical conversion coatings/pretreatments for aluminum

    Is there a difference between specifying a "5 stage chrome phosphate" pretreatment versus "clear chemical conversion coating per MIL-DTL-5541F Type 2 Class 3 (ROHS compliant)" Is the later just more specific? I guess the question is if I specify the MIL spec am I essentially getting a 5 stage...
  19. mcgyvr

    Symbol/Indication for where to apply solder

    Is there an industry standard/accepted symbol (like a welding symbol) or something to indicate on a drawing places to apply standard tin/lead solder on thru hole components? Just working on some assembly drawings and wanted to indicate all points where solder must be applied.. Thanks
  20. mcgyvr

    Low Profile pneumatic torque wrench

    Looking for a manufacture of a low profile pneumatic torque wrench. Needed for 7/16" socket. (25 to 50 in-lbs. torque) Looking for something with no more than a 1" profile to fit into a tight space? Socket can be ground down if needed.

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