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  1. M

    Leaf blower help

    You need the fan model number to research the performance curve. From that the speed/power/flow/pressure can be determined. That blower was almost certainly removed from an air handler. That size would be much higher than 5 HP. Do a quick search for "HVAC blower performance" Wikipedia will...
  2. M

    Hydrotest Air Compressor Tank

    Pressure vessels like this are designed to "leak before break" per ASME Section VIII, as mentioned. Testing frequency is specified by your state and insurance carrier, if the vessel is registered with the state (unlikely in a home shop). The volume displacement test mentioned is used on small...
  3. M

    What Antisieze on SS Battery Clamp

    The manufacturer's application chart: http://www.henkelna.com/us/content_data/186160_MaintenanceRepairOverhaul_CoatingSurfaceTreatments_AntiSeizeLubricants_pg32_33.pdf Also includes the coefficient used in the torque reduction calculation that gets beaten to death every several months.
  4. M

    Educate me about Grease, and if you're feeling generous, thread sealants

    Read up: http://www.machinerylubrication.com/Meta/Tags/greases
  5. M

    Tools for a Mechanical Engineering Student?

    Another direction, but a tool nonetheless. Engraved Fisher Space pen. I give them to all of my interns.
  6. M

    Help decipher my compressor air tank tag.

    National Board (of boiler and pressure vessel inspectors) number is the Identifier for the manufacturer in accordance with the code. W.P. is the maximum allowable working pressure MAWP, can't read the first number, looks like 200 psi. Safety relief valve must not be higher than this value...
  7. M

    tach

    ENM makes quality equipment. I use their hour meters on my yard equipment. I didn't get the 8 year life they specify on one of their vibration sensing hour meters. Changed to the old fashioned 12 volt hard wired mechanical style. Several others are going strong after four years.
  8. M

    tach

    If you're setting up the engine, as opposed to monitoring it while running, a photo tach is easy to use. With shaft end exposed, apply reflective tape, or paint a white dot. If the end is clean (shiny) paint it with flat black paint, then a dot of white...
  9. M

    tach

    http://www.tinytach.com/gasoline.php
  10. M

    Source for reasonably price SS air hose

    http://www.mcmaster.com/#standard-braided-hose/=y28o42
  11. M

    decent fluid pump for filling transmissions, diffs, etc?

    http://www.oilsafesystem.com/oss-oil-safe/oss-Oil-Safe-Drums-and-Lids
  12. M

    What is considered a "normal" pressure drop overnight due to temperature?

    Re: What is considered a "normal" pressure drop overnight due to temperature? Polytropic compression is one of the best approximations: http://en.m.wikipedia.org/wiki/Polytropic_process Straightforward for air, whose properties are well known. Gets a bit more involved with varying mixtures...
  13. M

    What is considered a "normal" pressure drop overnight due to temperature?

    Re: What is considered a "normal" pressure drop overnight due to temperature? A little light reading on the ideal gas law: http://en.m.wikipedia.org/wiki/Ideal_gas_law Specifically the isochoric (constant volume) process. As stated, the pressure change is a simple ratio of the temperatures...
  14. M

    mobil gear oil in gear box with brass

    Call Mobil's tech service. 1-800-ask-mobil. They will give a recommendation. They may substitute their SHC product line which has better compatibility with non ferrous gears. If you painted the inside of the housing, let them know that as well. Some oils can attack the paint. Article on worm...
  15. M

    Best cheap torque wrench?

    Very good site. Many technical papers and descriptive articles on the processes and tools. Geared toward the aerospace, automotive manufacturing and automated assembly industries. Their tools aren't the sexiest, but very accurate and repeatable. The test stands are first class. For the hell...
  16. M

    Best cheap torque wrench?

    In an ISO certified environment, torque wrench calibration is done at three points. 10%, 50%, 90% of full span. Three pulls at each point. Any failure +/- 3% or 5% (depending on the standards), the tool is adjusted. Another failure, rebuild, another discard. These are significantly more...
  17. M

    Snap on fk835 what's the deal with these ratchet?

    Looks like I'll be selling mine!
  18. M

    Any idea what this is???

    Hash pipe
  19. M

    who has built a tool for determining torque?

    You've effectively alienated the best source of true engineering on this topic (Adam C). Aerospace designs are the zenith of technology. Torque is being supplanted by direct measurement of fastener stretch using ultrasonic transducers embedded in the fastener. Torque is an inferred value for...
  20. M

    who has built a tool for determining torque?

    If you're truly interested in the relationships between torque; clamping force and fasteners, drop me a PM. I can send you an Engineering Standard that goes into great detail (brush up on your differential calculus, it's a Doosy). Your rig will be highly dependent on the surfaces of the...
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