2019-04-08 3 min read


Notes, 2019-04-08.
I'm looking to add a small (desktop sized or a little larger) CNC mill to The Prepared's workshop. If you've got recommendations/a pitch for your product, send me a note.

If you missed last week's Quarterly Report, click around over here and I'll be more than happy to catch you up on what's in store for The Prepared this upcoming quarter + get you on the swag distribution list :)

The most clicked link in last week's issue (~12% of opens) was NASA's fastener design manual, *again.*

Planning & Strategy.

  • Ernst sent me a very well argued email after last week's issue, with the net result that I will no longer be using the designation "MM" to denote "million." I agree with Ernst that "M" (for Mega) is a better choice, and apologize for my past inconsistency (for the most part I'm good about using SI units and ISO dates/times).
  • Patagonia will now prioritize B-corps (and deprioritize "companies that they view to be ecologically damaging") on their co-branded apparel. I'm all for being customer-centric, but there's something about this - being focused enough to tell a certain class of people that no, they're really *not* your customers - that is really compelling to me.
  • Aerojet Rocketdyne acquired 3DMT, a (mostly) metal printing job shop.
  • Managed by Q, which offers office management as a service, was acquired by WeWork.

Making & Manufacturing.

  • A remarkably technical explanation of trochoidal milling, in which an end mill creates a slot larger than its diameter by following a looping tool path. This results in lower radial engagement/radial force, meaning that higher axial depth of cut can be used.
  • Nord-Lock wedge-locking washers are apparently effective as lock washers, thought they do have the effect of marring the bearing surface (something the NASA design manual focuses on eliminating, due to the risk of corrosion). On the other hand, they aren't subject to the temperature limitations of nylon pellet/collar locking methods.
  • Formlabs (which has been a sponsor of The Prepared) introduced a new, long-awaited printer and a new prototyping resin.

Maintenance, Repair & Operations.

Distribution & Logistics.

Inspection, Testing & Analysis.


An absolutely remarkable interactive 3D map of stuff (satellites, rocket bodies, debris) in space.

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