Posts Tagged Repairs
The elastic cord behind the left-side under-seat Easy Reacher pack on my Tour Easy snapped some time ago, probably due to wear against the brace I installed to keep it from flopping around. Quite contrary to what I expected, the repair turned out to be almost trivially easy.
The cord terminates in a pair of plastic lugs, each with a ferrule that slipped off under moderate persuasion to reveal a pair of wedges that engaged the cord:
I expected the ferrule to have a positive lock engaging those wedges, but, nope, there’s (at most) a small ridge. Pry the wedges out and the cord slides out of the lug without a protest; the wedges don’t quite meet in the middle with the ferrule in place and there’s plenty of retention force on that flexy cord.
One of the shorter bungie cords in my collection turned out to be exactly the right diameter and length, with ends secured in its hooks using a simple crimped wire. Bending the ends of the wire at right angles freed the cord from its embrace:
The original stainless steel hook lies by the edge of the road along my usual bicycling route, but a slightly reshaped S hook (made, alas, of ordinary steel) fits around the cord well enough. When this one rusts away, I have plenty more.
Insert cord into lugs, push ferrules over locking wedges, remove one ferrule and lug, install reshaped S hook, reinstall lug and ferrule, install new cord on pack:
Install pack on bike: done!
I have no explanation for how well this worked out; I fear the Universe is saving up spit for something truly awful.
Took a picture of the sewing machine setup with the Sony DSC-F717, transferred it into DigiKam, got the “done transferring, you can disconnect the camera” message, believed it, disconnected the camera, deleted the image file, and then discovered that DigiKam mislaid the image file.
Rather than re-set-up and re-take the shot, I followed my own directions and recovered the image from the Memory Stick:
dmesg | tail [43176.079853] usb 2-1.6.3: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [43176.079855] usb 2-1.6.3: Product: Sony PTP [43176.079856] usb 2-1.6.3: Manufacturer: Sony [43198.073652] usb 2-1.6.3: USB disconnect, device number 22 [43333.788533] sd 9:0:0:0: [sdc] 1947648 512-byte logical blocks: (997 MB/951 MiB) [43333.803292] sd 9:0:0:0: [sdc] No Caching mode page found [43333.803299] sd 9:0:0:0: [sdc] Assuming drive cache: write through [43333.824681] sd 9:0:0:0: [sdc] No Caching mode page found [43333.824688] sd 9:0:0:0: [sdc] Assuming drive cache: write through [43333.825491] sdc: sdc1 sudo dd if=/dev/sdc of=/tmp/pix.bin bs=1M ^C615+0 records in 614+0 records out 643825664 bytes (644 MB) copied, 38.5841 s, 16.7 MB/s strings -t x pix.bin | grep Exif | head 68006 Exif 208006 Exif 3f8005 _Exif 7b8006 Exif 13d8006 Exif 15b0005 wExif 1798005 CExif 19c0006 Exif 1b90006 Exif 1f98005 %Exif dd if=pix.bin of=image03.jpg bs=$((16#1000)) count=1K skip=$((16#3f8)) 1024+0 records in 1024+0 records out 4194304 bytes (4.2 MB) copied, 0.0121431 s, 345 MB/s display image03.jpg convert image03.jpg dsc00656.jpg
Obviously, there was a bit more flailing around than you see here, but that’s the gist of the adventure. For what it’s worth,
image01 was a random blurred shot and
image02 is the ID picture I keep on all my cameras.
convert step discards all the junk after the end of the image, so the
dsc00656.jpg file doesn’t include anything unexpected.
The picture isn’t all that much to look at, even after cropping out the background, but …
The advantage of the manual method: renewing one’s acquaintance with tools that come in handy for other tasks.
My desk flashlight has three “functions”:
- 5 UV LEDs
- 10 white LEDs
- laser pointer
A four-click rotary pushbutton switch actuates the three functions (plus “off”) in sequence:
All three lights became intermittent, which suggested a poor return connection at the far end of the battery. The case is, of course, aluminum, with coarse-cut threads that grate as you tighten the parts. I cleaned the crud out of the threads, anointed them with Ox-Gard compound, and discovered that the laser and UV LEDs were still flaky.
Taking the thing apart and unsoldering the switch connections revealed the problem:
Yup, two lousy solder joints. They’re not exactly cold solder joints, because there’s not really a joint there to begin with; the switch tabs never got hot enough to bond with the molten solder before it cooled.
A dab of flux and touch from a hot soldering iron solved that problem.
Assemble in reverse order and it works better than it ever did before!
The brittle tubing on Mary’s Interplak water jet continued to disintegrate, so I replaced the entire tube with Tygon:
Nisley’s First Rule of Plumbing: Never, ever look inside the pipes delivering water to your faucet.
That’s not quite inside the pipes, but it’s pretty grotendous, isn’t it?
As expected, flexible tubing doesn’t transmit the pressure pulses nearly as well as the OEM rigid tubing, so we finally bought a new Waterpik. At least you can get replacement tubing for Waterpiks, but I’ll wait until it fails before stocking up.
Contrary to what you might expect, I cut the Interplak’s cord, harvested the motor windings, and dumped the carcass in the trash.
Both Shimano SPD pedals on my Tour Easy have been creaking while climbing hills and I’ve gradually eliminated all the usual mechanical suspects: loose bottom bracket bearings (it’s a cartridge), loose cranks (they’re the old-school tapered squares), loose pedal spindles, and so forth. Of course, it’s impossible to produce the creak with the bike clamped in the work stand, which make debugging particularly frustrating.
After all that, I noticed the shoe soles were wearing the pedal frames just outside the cleat clamps:
So I went so far as to carve away a bit of the sole:
Turns out none of that solved the problem.
What did solve the problem: a drop of oil on the rear of the cleat. You can see a smear of oil on the sole; it doesn’t take quite so much.
As nearly as I can tell, the rear of the cleat drags on the slightly irregular surface of the clamp and, both surfaces being hardened steel, they stick-and-slip just slightly.
A dab of grease may provide longer-lasting relief …
This doesn’t happen very often, but, after a few road trips and some jostling around, the M2’s platform was definitely out of alignment: the first layer came out generally too thin, with the X-Y+ quadrant very much too thin.
I tried a quick and dirty adjustment that didn’t produce meaningful results, then broke out the Starrett Taper Gauge and did it right.
The relocated platform height switch is about 4.5 mm higher than the nozzle, so:
- Jog the nozzle off the platform to the right
- Home the Z axis
- Define that position as Z=-6:
- Move to Z=0:
- Jog around measuring the height of the nozzle above the platform
- Adjust screws to reduce variation
- Change Z offset in startup G-Code
- Run off a few test patterns to get the platform heated
- Measure actual thickness
- Change Z offset to get the right answer
This progression of cold measurements, read top-to-bottom, left column first, shows the observed nozzle height above the platform around the edges and at the center:
The final measurements seem to indicate the glass plate is 0.2 mm convex in the center, but I wouldn’t trust the measurements to that level of accuracy. It’s probably bowed upward, but it’s certainly close enough.
The cold measurements suggest that the Z offset should be -4.80 mm, but the measurements on the hot platform with actual extrusion threads showed that -4.50 mm produced the correct thicknesses.
It’s not clear automating the movements would produce better or faster results than just manually jogging the nozzle around the platform, particularly since it happens only every few months.
This would be easier with the Z offset stored in the EEPROM and some modified startup G-Code to retrieve it.
…. the armor layer under the tread starts peeking through:
Actually, it started peeking through early this year, but why rush things?
I swapped in a Michelin Pilot City 700x32C tire with their Protek Max armor and reflective sidewalls; we’ll see how well all that works.
No tire liner inside, so I’m depending on the armor and the fact that it’s a rather chunky tire.