The metal-shell version is advertised as “09872-60066 Calibration Pen for fit HP DesignJet 2000CP 2500CP 2800CP 3000CP 3500CP 3800CP Original New” which makes absolutely no sense, as those were inkjet and laser printers with (AFAICT) no need for a “calibration pen”. Because nobody with those printers will buy (or even look for) a widget they can’t use, the price is surprisingly low, compared to the real ones occasionally found on eBay.
My guess: somebody halfway around the planet found a pile of Genuine HP plastic snap boxes, filled them with knockoff sights vaguely similar to the original (perhaps intended for a different plotter?), and marketed them with the usual (lack of) attention to veracity.
Found behind a store in Red Oaks Mill, overlooking the Mighty Wappingers Creek:
Tree stump around guide rail
The old rail fell off its (long gone) post before the tree grew around it and the newer rail (upper right) definitely isn’t fresh from the factory, so this tableau has been on display for quite a while.
The tree’s growth rings have pretty much weathered away.
We’re bicycling on Collegeview Avenue, approaching the eastern traffic circle (of three) along Raymond Avenue. I’m in the lead, hauling a trailer with the week’s groceries:
Zero Clearance – Ed Front – 2021-09-07 – 0497
The four digit frame numbers tick along at 60 fps for my helmet camera and 30 fps for the rear cameras.
Note the “splitter” (a.k.a. “pedestrian refuge”) on the left, intended to separate Collegeview’s incoming and outgoing traffic. It formerly had one non-reflective black bollard on each side of the ladder crosswalk, but errant drivers destroyed so many bollards along Raymond that they’re now WONTFIX remnants. The flush concrete disk in the lower left of this picture will become relevant in a few seconds of real time:
Zero Clearance – Ed Front – 2021-09-07 – 0593
Collegeview has the same deteriorating pavement as found along Raymond Avenue, so we must maneuver beside the potholes:
All of us are slowing to stop at the traffic circle, with Mary behind the car that will eventually stop beside me:
Zero Clearance – Ed Rear – 2021-09-07 – 1522
Mary could see the car behind her in her helmet mirror, but she’s slowing to stall speed with no time for sightseeing and no room for maneuvering. The view from the camera on the seat frame behind her left shoulder:
Zero Clearance – Mary – 2021-09-07 – 0957
Two seconds later:
Zero Clearance – Mary – 2021-09-07 – 1078
One second:
Zero Clearance – Mary – 2021-09-07 – 1110
Two more seconds:
Zero Clearance – Mary – 2021-09-07 – 1182
Mary has stopped, as shown by the parked car’s unchanging position in the frame over on the left in the next images. The driver, however, continues creeping slowly forward; there can be no doubt she sees Mary at this distance.
After three more seconds:
Zero Clearance – Mary – 2021-09-07 – 1270
One second later, the front wheel is exactly at Mary’s left foot:
Zero Clearance – Mary – 2021-09-07 – 1308
The same events, viewed from the camera on my bike, start less than one second from the 1522 image above. I’m stopped, while the driver next to me continues to roll forward.
Mary is extending her left leg in preparation for a complete stop, at about the same time as the 1078 image:
Zero Clearance – Ed Rear – 2021-09-07 – 1542
Three seconds later her toe touches the pavement, while both she and the driver continue moving forward very slowly:
Zero Clearance – Ed Rear – 2021-09-07 – 1634
Five seconds later, she is stopped with her foot firmly planted:
Zero Clearance – Ed Rear – 2021-09-07 – 1773
And the driver continues moving:
Zero Clearance – Mary – 2021-09-07 – 1333
Another five seconds and the sidewall bulge of the car’s radial tire is pressing her foot to the pavement:
Zero Clearance – Ed Rear – 2021-09-07 – 1934
A closer look:
Zero Clearance – Ed Rear – 2021-09-07 – 1946 detail
She yanks her foot away:
Zero Clearance – Ed Rear – 2021-09-07 – 1953
While the driver continues to creep forward:
Zero Clearance – Mary – 2021-09-07 – 1397
Sometimes, it’s the only way to get some attention:
Zero Clearance – Ed Rear – 2021-09-07 – 2026
Mary is now off-balance, leaning on the car door, explaining what just happened:
Zero Clearance – Ed Rear – 2021-09-07 – 2152
Mary regains her balance as the driver backs cautiously away:
Zero Clearance – Mary – 2021-09-07 – 1546
Were the bollard still atop that sad concrete foundation, the driver might not have driven up on the splitter to get around Mary, if only to avoid scuffing a fender:
Zero Clearance – Ed Rear – 2021-09-07 – 2479
Compare this clearance with what you saw earlier in the 0957 image:
Zero Clearance – Mary – 2021-09-07 – 1627
Mary can’t get far enough away, but this must suffice:
Zero Clearance – Ed Rear – 2021-09-07 – 2761
Now the driver can pass her again with more clearance:
Zero Clearance – Mary – 2021-09-07 – 1891
I pointed to the car, then to the circle, and shouted “GO!” because neither of us wanted to be in front of that particular driver:
Zero Clearance – Ed Front – 2021-09-07 – 2540
We’ll surely meet her again, ideally with more clearance.
The USGS has a hydrology station just downstream that reported about 10 feet of water, the “moderate” flood stage, around the time I took the first picture. The normal level is 3 feet.
The “major” flood stage is 14 feet and, back in 2007, this is what it looked like at 15 feet:
Red Oaks Mill Dam – 2007-04-17
Our reference point is a drain pipe on the retaining wall behind the hotel: when the Mighty Wappingers Creek covers the pipe, it’s well and truly flooding.
Photo from the Pixel 3a, zoomed all the way, and showing why digital zooming isn’t the way to get nice pictures. On the other paw, it’s the camera I always have with me.
With the Bafang BBS02 and all its gimcrackery on the Terry Symmetry buttoned up and ready to go, I took a few closeout pictures for future reference.
The motor has a sheaf of wires sticking out of the bottom crying out for a protective covering:
Bafang BBS02 – wire bundle cover
Although cameras tell only the truth they’re allowed to see and can be made to lie by omission, sometimes their latent truth was completely invisible to eyewitnesses in real time.
I only noticed the mis-routed shift cable when I looked through the last set of pictures.
It should pass through the plastic channel under the metal tab holding the cable guide to the bottom bracket shell:
Bafang BBS02 – wire bundle vs shift cable
Normally, aiming the cable into the channel is no big deal. In this case, I had to undo the shift cable, remove the left crank, loosen the motor and rotate it out of the way, nudge the cable with a small screwdriver, then reinstall in reverse order.
This requires drilling holes through the extrusions:
Microscope Stage Positioner – Makerbeam drilling
Running the center drill down until it just nicks the sides produces enough of a pilot hole through the center section to capture the 3 mm drill. If I had to drill enough holes to make a fixture worthwhile, I could probably eliminate the divots.
Two more holes + epoxied M3 brass inserts attached the 60 mm beam directly to the Z Axis stage, thereby eliminating the vertical beam and a steel bracket:
Microscope Stage Positioner – Makerbeam joints
The M3 SHCS attaching the 100 mm beam goes through both beams. I think you could get the same result with a Tee Nut or a 12 mm Square Head bolt, should you have those lying around and don’t want to drill another hole. The Corner Cube screwed into both beams prevents rotation and helps ensure perpendicularity.
The Y stage now attaches directly to the beam, rather than through a pair of Corner Cubes, because I realized I wasn’t ever going to adjust its position.
The Z Axis stage stands on the plastic plate through a hellish mixture of metric and USA-ian screws. Basically, the 6-40 screws into the stage were long enough, the 6-32 screws through the plate fit the existing holes, and M3 screws are for MakerBeam:
Microscope Stage Positioner – Z Axis base
To my utter astonishment, the threads in the end of the vertical beam had the proper alignment to let a Square Head bolt snug the beam against the 40 mm beam on the plate. As a result, the L Bracket just prevents the vertical beam from turning on the screw and the combination is as rigid as you (well, I) could want.
The 40 mm beam has two spurious holes, because I thought I could avoid drilling another hole in the baseplate. Nobody will ever notice.
After squaring and tightening everything, the 100 mm beam along the Y Axis is now horizontal within 0.2 mm and the X Axis is horizontal to better than I can measure.
The Smell of Molten Projects in the Morning 