Road Conditions: Rt 376 SB Near Maloney Rd
Posted by Ed in Recumbent Bicycling on 2016-09-25
NYSDOT seems oddly reluctant to perform routine brush clearing along Rt 376 from Red Oaks Mill to the Hamlet of New Hackensack, despite the obvious hazard presented by the bushes:
Rt 376 SB shoulder overgrowth – 2016-09
I’ve reported this situation several times over the years, but, as you’ve seen in other situations, that has no effect.
If it were a pleasant back-country lane, rather than our main route to the Dutchess Rail Trail, perhaps having the greenery take over the shoulder wouldn’t matter quite so much:
Rt 376 SB – semitrailer
Turns out the shoulder just north of Maloney has developed lethal cracks as the pavement subsides into the adjoining section of the Mighty Wappinger Creek. A bit more clearance would still be nice.
Internet Of Things, Banking Division
We were sitting in the Credit Union and, as usual, I scouted out the WiFi situation:
IoT Thermostat in the Credit Union
Huh. Not what you’d expect to find in a bank lobby.
In case you haven’t seen what can happen with a thermostat, you can pwn a Nest.
Searching with the obvious keywords should provide plenty of reasons why the Internet of Things isn’t ready for prime time, not that that will slow it down in the least.
Miniblind Bottom Rail Caps
Posted by Ed in Home Ec, Machine Shop, Software on 2016-09-23
A few days after installing the replacement cord caps, I bumped the bottom rail of the miniblind while opening the window and had one endcap disintegrate; apparently window hardware isn’t hardened against prolonged UV exposure. Who knew?
Fortunately, I can fix that:
Miniblind bottom rail caps
Making the walls three threads wide provides enough room for a single solid infill thread:
Miniblind Endcaps – Slic3r Preview
The exterior shape comes from a hull wrapped around six circles: four to define the corner radius and a pair that bump the center out by the calculated chord height. The interior shape comes from a pair of chord-radius polygonal circles (they only have three facets across the length of the inside wall) that fit the bottom rail almost perfectly.
As always, natural PETG has a crystalline, slightly transparent, appearance:
Miniblind bottom rail cap installed
I should spring for some opaque white filament, but that way lies madness; I might start caring what these things look like.
You can buy entire miniblinds for a few bucks a pop, but the last time we did that, they were different than the ones we had before. That wouldn’t matter if the standard miniblind mounting brackets fit our 1955 Anderson windows, but noooo they don’t: the custom adapters I machined for the first miniblind brackets, of course, didn’t fit the new miniblinds.
Now I can just snap the replacement endcaps (and cord pulls) in place, declare victory, and move on.
The OpenSCAD source code as a GitHub Gist:
The original doodle with some dimensions that didn’t withstand careful measurements:
Miniblind Endcap dimension doodle
Vacuum Tube LEDs: Miniature 7-pin Tubes With a Bottom Shield
Posted by Ed in Electronics Workbench, Machine Shop, Oddities on 2016-09-22
Apart from the Bakelite bases on octal tubes, I figured there should be no problem shining a light up through the glass envelope. Come to find out that some of the tubes with Miniature 7 bases have an electrostatic shield (?) across the bottom that pretty well blocks the light.
This 6BJ6 has a neatly trimmed octagon:
6BJ6 – octagon shield
The shield plate, if that’s what it is, doesn’t have a standardized shape. This 6CB6 sports a simple square:
6CB6 Square Shield
The Box o’ Hollow State Electronics contains one 6BE6 tube (a heptode with five grids connected to four pins) without a shield:
6BE6 – Clear base
Yeah, those pins are rather grotendous.
And another 6BE6 with a semitransparent smudge not connected to anything else; it would look accidental if it weren’t inside the tube:
6BE6 – Tinted Base
All the shielded tubes are pentodes, for whatever difference that makes.
These tubes may be a bit too small compared to the hard drive platters; Novals will work just fine for my simple purposes.
Raspberry Pi Serial vs. TNC-Pi2 vs. APRX
Posted by Ed in Amateur Radio on 2016-09-21
The APRX iGate program I’m using produces a hardware & software event log file:
2016-09-03 11:24:40.368 TTY /dev/serial0 read timeout. Closing TTY for later re-open. 2016-09-03 11:25:10.373 TTY /dev/serial0 Opened. 2016-09-03 11:32:05.485 CLOSE APRSIS noam.aprs2.net:14580 heartbeat timeout 2016-09-03 11:32:15.495 CLOSE APRSIS noam.aprs2.net:14580 reconnect 2016-09-03 11:32:15.776 CONNECT APRSIS noam.aprs2.net:14580 2016-09-03 12:25:11.154 TTY /dev/serial0 read timeout. Closing TTY for later re-open. 2016-09-03 12:25:46.154 TTY /dev/serial0 Opened. 2016-09-03 15:50:14.905 TTY /dev/serial0 read timeout. Closing TTY for later re-open. 2016-09-03 15:50:46.155 TTY /dev/serial0 Opened. 2016-09-03 16:50:51.155 TTY /dev/serial0 read timeout. Closing TTY for later re-open. 2016-09-03 16:51:26.155 TTY /dev/serial0 Opened.
I have no idea what’s going on with the “read timeout” messages. They seem to occur almost exactly a hour apart, except when they’re a few hours apart. The TNC-Pi2 board includes a PIC processor; maybe it loses track of something every now & again, but APRX only notices if it happens in the middle of a read operation.
The APRSIS server connection drops every few days and APRX seems well-equipped to tolerate that.
All in all, it’s working fine…
Vacuum Tube LEDs: Fully Dressed 21HB5A
Posted by Ed in Electronics Workbench, Machine Shop on 2016-09-20
Black PETG definitely looks better than cyan for this job:
21HB5A – Black PETG base – flash
Holding the plate cap to the tube with a thin ring of opaque epoxy cuts down on the glare under its edge:
21HB5A – Black PETG base – cyan phase
Fire in the bottle!
21HB5A – Black PETG fittings – punched drive platter – purple phase
It’s still running basically the same Arduino code as before, but I have some ideas about that…
Hard Drive Platter Punch Bushing
Posted by Ed in Machine Shop, Software on 2016-09-19
The last time I punched a hard drive platter, I lathe-turned a bushing to center the Greenlee punch:
Greenlee punched drive platter
This will work better:
Vacuum Tube Lights – Greenlee punch bushing
The OD centers the bushing inside the punch body, the ID captures the screw, and the raised boss captures the platter.
After drilling the platter on the new fixture, it’s ready for punching:
Hard drive platter – Greenlee punch bushing
Line everything up, turn the screw, and It Just Works:
Hard drive platter – punched
The masking tape holds the platter to the bushing, eliminating the need for a third hand. The bushing emerges unscathed, ready for another platter. Overall, I think that’s faster and less messy than milling the platter ID on the Sherline.
Printing out a base to fit the Duodecar socket and assembling all the parts:
21HB5A in socket on platter – detail
The Duodecar pin circle (19.1 BCD + 1.05 pin diameter) will actually fit inside a hard drive platter’s 25 mm unpunched ID. It might look a bit squinched, but the less you see of the socket, the better. I’ll try that on the next one.
The OpenSCAD source code is the same as before; set Layout = Bushings; and a bushing will pop out.
The original bushing doodle with dimensions:
Greenlee 1.25 inch punch bushing for hard drive platter – dimension doodle
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