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  1. Brian Malone

    Need help sourcing a custom-made Buna O-ring.

     dgeesaman - "That photo feels implausible to me, especiall with the groove depth barely reaching the centerline of the o-ring body" I am on the fence over whether I should post a more complete photo of the example I offered to counter your skeptical remark but the full geometry is part of a...
  2. Brian Malone

    What process / method to make this aluminum edge?

    Look up edge curling/roll-forming/ hemming. https://ems-metalworking.com/edge-curling-machine/
  3. Brian Malone

    Need help sourcing a custom-made Buna O-ring.

    No glue used - the schmutz is just debris on a part returned from service. The part of the seal on the right is just I was lazy and did not push that area of the seal down and took a bad photo. :-) I place o‐rings in uncircular grooves without issue. No ruptures or squirms. Certainly, this is...
  4. Brian Malone

    Need help sourcing a custom-made Buna O-ring.

    3DDave and  Compositepro, your guidance on o-ring cord stock is correct since the OP's seal is not close to a standard AS568 size. An option would be to redesign the seal parameters to be nearer to a -268 or -269 to allow use of an off-the-shelf part.
  5. Brian Malone

    Need help sourcing a custom-made Buna O-ring.

    I commonly use o-rings in regular (non-undercut) grooves without issues of ride-out/lift-up as long as the corner radii are not extremely tight.
  6. Brian Malone

    Need help sourcing a custom-made Buna O-ring.

    You are possibly over specifying on your design. An o-ring or any flexible seal is by definition: flexible - the actual final shape is going to vary unless measured in a constrained condition. Specifying +.001/-.000 on size dims is unrealistic for most fabrication processes for a...
  7. Brian Malone

    Air India 787 crashes on take off

    This video from Hoover (pilot debrief) touches on an idea  LittleInch posited back in posts #34 & 36, that the fuel cutoffs may have been inadvertently activated when attempting to adjust for a failing engine just at the V1 point.
  8. Brian Malone

    Guizhou bridge collapsed due to landslide

    This is old - sorry, thought it was new. Well, I think this is new . . . an earlier time/date stamp on the ShanghaiEye video had the year as 2024. It says 2025 now. https://www.yahoo.com/news/driver-truck-hangs-precariously-over-095848390.html
  9. Brian Malone

    Guizhou bridge collapsed due to landslide

    Crazy rescue of a semi truck driver on the approach of a bridge that collapsed in Guizho, China. Driver was quite fortunate the trailer wedged as it did and cab/trailer pin did not fail
  10. Brian Malone

    Elon's Roman Candles

    According to this story, SpaceX has completed in-orbit fuel transfer. The accomplishment got little attention. If the tools and techniques are solid, the in-orbit refueling is figured out. The logistics of getting tanker Statships positioned as required along the Earth-to-Mars path remains to...
  11. Brian Malone

    Titan sub noise heard on board support ship.

    The OG board members have some culpability too. Though they probably did not have direct control of design and testing, they apparently supported Stockton Rush as CEO. At least two of the board members have subsea/marine/naval experience. I have not seen any indications the board publicly...
  12. Brian Malone

    Elon's Roman Candles

    Cryogenic fuels either need to be prepositioned for use or produced in-situ - neither technique or tech exists. Either task is daunting, yet they are spoken of off-handedly - 'we will refuel in orbit, no problem'. That is part of where I see the hype of Starship. A manned mission is so much more...
  13. Brian Malone

    Elon's Roman Candles

    Regardless, in-orbit refueling or Moon-base refueling, there is a huge technology void to be filled for fuel production, oxygen production, food production, and water production. Certainly the fuel, O2, food and H2O can all be boosted to orbit from Earth - it should just be a logistical exercise...
  14. Brian Malone

    Stars, upvotes, and likes.

    I have the same question: I don't see any guidance in the FAQs. Or I have missed it. . .
  15. Brian Malone

    Tesla Cybertruck fire and alleged design flaw. . .

    Interesting an electric door release without a mechanical scheme is able to pass a reasonable functionality/hazard mitigation review for use in a passenger vehicle.
  16. Brian Malone

    Elon's Roman Candles

    I don't understand the hype of the Starship. How will this single piece of hardware make a trip to Mars possible for a human? Starship, though a large and powerful rocket cannot lift and transport the necessary life support materials and fuel for a trip to Mars and a return trip. The distance...
  17. Brian Malone

    Tesla Cybertruck fire and alleged design flaw. . .

    This story says a lawsuit has been filed against Tesla on behalf of the family of a man who crashed his CT and was unable to open the electrically operated doors after the electrical system became damaged by the crash, and he perished in the vehicle fire created by the battery in a thermal...
  18. Brian Malone

    Air India 787 crashes on take off

    Wow, incorrect FADEC input can put even an experienced crew in a pinch if they are not fully paying attention.
  19. Brian Malone

    Titan sub noise heard on board support ship.

    The US Coast Guard document is here: https://www.news.uscg.mil/News-by-Region/Headquarters/Titan-Submersible/smdsort32560/publicationdate/ Doc.CG-104 ABS
  20. Brian Malone

    Titan sub noise heard on board support ship.

    I get what you are saying about the potential effects of moisture on the epoxy/Ti bonds. I am more interested in how an unproven/non-standard design could have been properly engineered and the missteps of the OceanGate team leading to the disaster. Now that I have a better understanding of some...

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