3 ms·
The fixture they used to remove the bolts is pretty interesting. Looks like a milled aluminum two part clamp for a ratchet with a 3in extension. It is interesti
by adolph 3y ago
The fixture they used to remove the bolts is pretty interesting. Looks like a milled aluminum two part clamp for a ratchet with a 3in extension. It is interesting that they claim to have milled their own Torq-set bit but the picture shows a commercial/OTS 1/4" to hex adapter.
In response, two new multi-part tools were designed and fabricated to support further disassembly of the TAGSAM head. These tools include newly custom-fabricated bits made from a specific grade of surgical, non-magnetic stainless steel; the hardest metal approved for use in the pristine curation gloveboxes.
https://blogs.nasa.gov/osiris-rex/2024/01/11/nasas-osiris-rex-team-clears-hurdle-to-access-remaining-bennu-sample/ https://blogs.nasa.gov/osiris-rex/2024/01/11/nasas-osiris-re...
https://www.phillips-screw.com/drive_systems/torq-set/ https://www.phillips-screw.com/drive_systems/torq-set/
- pimlottc 3y agoHow can you tell it’s a commercial bit? The part with writing on it looks like it’s an adapter, the bit itself does not seem to have any visible markings.
- adolph 3y agoSorry for unclarity--that's not my query/assertion. Assertion: looks like a commercial adapter. Query: why use the commercial adapter if you are already milling a custom bit? There are probably some practical answers to this if I gave it enough thought. Like, the CAD file to mill a hex bit was already available to NASA; or, it kept the overall length the same so the clamp could be developed in parallel.
- toast0 3y agoI think they're concerned about the bit wearing the fastener etc. But the adapter has a much more secure mating. I've stripped plenty of screws, but never managed to damage one of these adapters. That said, I've only broken one socket in my life; so I'm not a big tool abuser; maybe someone else has a story of breaking one of these.
- adolph 3y agoYeah, I think there are 24 or so Torq-set screws to unscrew once in the TAGSAM, so wear probably isn't a problem.
- onion2k 3y agoa 3in extension Didn't NASA agree to go fully metric under Obama after the cancellation of Constellation?
- adolph 3y agoThe metric conversion was much earlier, see below. NASA probably has people/processes/systems in place to communicate in freedom units even if the internal unit makes it tricky to determine a third of something. In 1930, the British Standards Institution adopted an inch of exactly 25.4 mm. The American Standards Association followed suit in 1933. By 1935, industry in 16 countries had adopted the "industrial inch" as it came to be known, effectively endorsing Johansson's pragmatic choice of conversion ratio. https://en.wikipedia.org/wiki/Inch https://en.wikipedia.org/wiki/Inch