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  1. D

    Left vs right thread

    I think fuel gas fittings are often LH thread.
  2. D

    PTC Renewals

    This company moved to Inventor after decades with PTC. There were also issues with the updated Windchill file management that required huge server upgrade. Maintaining a handful of PTC licenses to support access to two oceans of legacy models and drawings. that now have been migrated to a giant...
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    Movable-shaft design for adjustable gear teeth engagement

    https://www.e46fanatics.com/threads/steering-backlash-adjustment.726710/
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    identifying and using AP242 STEP files

    We still sell some of our parts that have been in production for over 50 years. We have patterns for many of them, made back in the day when there were still foundries in Massachusetts and the sales volumes were much higher. We provide finished part drawings, not pattern drawings. When a...
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    identifying and using AP242 STEP files

    A supplier sent us a STEP file of a model they created from our drawings for a fairly simple cast part. The STEP file was Exported from Solidworks 2024 I believe, although that may not be too important. I inquired if the STEP file was AP242 . No reply yet. They also sent an approval form that...
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    tig welding tubing, fitting face perpendicular to tubing

    Once upon a time we were asked to reface some used floating clutch disks from some vintage Ferrari. Maybe .2" thick or maybe less. They were worn, and sort-of flat. Each time .005" or so was gently wet ground off one face, the disk would distort to a new shape, so we stopped. The owner took the...
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    Tips on cold emails?

    Usually I delete cold e-mails and then block the sender. Once in a while I don't.
  8. D

    Determining the Fracture Mode: Brittle Fracture vs. Fatigue in a Pump Shaft

    May I have some pictures of the remainder of the shaft and the machine or device that "broke" it? Also some details about the service history. Would this happen to be a belt driven device ?
  9. D

    Need help in design of purified water generation system

    Dang. I was thinking when you said API you meant these folks - https://www.api.org/ I really was.
  10. D

    Journal Bearings, Lead, and the ethics thereof

    If the bronze bearing ever experience less than EXCELLENT full film lubrication you may find that a leaded bronze offers huge benefits.
  11. D

    Lower Ball Joint in Tension

    Several years ago My older daughter's 1996 Honda Accord had a lower ball joint break/unseat while slowly navigating her residential neighborhood. That car had passed Massachusetts' annual RMV inspection about a month before. It was the OEM joint with over100 kmiles. Replacing front brake...
  12. D

    Stress Distribution

    If the upper and lower edges of two spaced tablets are welded to the jaws of the fixed Stillson wrenches, AND the purple forces are applied as shown I'm thinking it may be more of a weld shear tester. If the purple forces will actually be applied more towards the center of the tablets it might...
  13. D

    Torque wrench limited space

    "cut the head off" I seemed to have missed the OP saying there is an issue removing/loosening the nuts. But that does happen sometimes.
  14. D

    Experiments with "Constrained Layer Damping" of Small Bore Connections

    Do you have a project, or is this just curiosity? I think any torsionally flexible coupling would "reduce dynamic stress levels", no damping required. Unless a torsional resonance is involved, and then a big whiff or two of damping would be desirable.
  15. D

    Square drive socket - loosening prevention

    If I understand the "ball groove" correctly, it is the four shallow grooves that run the full length of the socket. I don't think their purpose is to affect loosening. I think it is to ease manufacturing. I think they first drill a hole down the center to remove a bunch of material to make it...
  16. D

    Thoughts on decoupled suspension.

    "a vast improvement in secondary ride." Is this a decent reference for a big dummy ? https://blog.prosig.com/2012/08/15/what-is-primary-and-secondary-ride/
  17. D

    Fan vibration

    Without vibration frequency, phase and direction information I feel I'm bringing a knife to a gun fight. Well, actually more like bringing a Nerf gun to a gun fight. Basically I'm un-armed. 1X fan speed - unbalance - looking at that wimpy set-up, fan pulley/sheave runout ( unavoidable with...
  18. D

    Torque wrench limited space

    How much torque? I think a single u-joint at the socket on the nut, with a 12" or longer extension could work. The head of the torque wrench would have to be guided/restrained. Harder to do benignly with some types of torque wrench. A few trials tightening some accessible nuts directly, and...
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    Concealed Flange Hangers

    Yeah, fasteners splitting the end of the beam, espcially if the grain was like this. https://images.thdstatic.com/productImages/880cca39-c8df-4f12-a0aa-b48636f46c42/svn/framing-lumber-108524-64_600.jpg Single Joist — Fill all round holes on one leg of HUC with #10 screws to web of joist...
  20. D

    Fine Dyno tuning

    In the olden days motorcycle carburetors had small hoses on the bowl vent. Gently sucking or blowing on the vent hose could suggest whether richer or leaner jetting should be tried next.

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