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May '12
This page describes work accomplished on the new TMRC layout during the month of May 2012, as taken from the descriptions posted to the club mailing list.
May 9

This shows Progress occurring across WIndsor St, in the former parking lot (much missed by car owners).

Quentin obtained a high-efficiency LED driver suitable for the 1 Watt LEDs we've used to illuminate Berkmannville, as in the April 25 report. It definitely works. (The unit is in the lower left of the picture.) It has a nominal output of 330mA, and the meter shows that it's delivering 327mA. Not bad.

An economic issue needs to be addressed. This driver can control 6 LEDs and costs $4.00. A linear driver costs less than $1 if we hand-wire it, but it generates heat. Do we want to buy a lot of these drivers? Do we want to attempt to make our own?


May 12

John M got the electronic Citgo sign working again! Just as before, it's not easy to see it unless the lights are dim.

John P brought in a couple of new bandsaw blades, which was good because it was becoming difficult to tell which edge of the existing blade had the teeth on it. Then he cut a piece of webbing belt with the saw and got the new blade all fuzzy, but the fuzz should come off.

One of the guide wheels beside the blade has jammed solid. A new part is needed.

Bill started nailing down the roadbed in front of the paper mill above Berkmannville.


May 16

More Progress on the paper mill track planning.
It looks as if we have something it's possible to build, though there are some complicated track arrangements--a 3-way turnout and a couple of crossings.
Why is Alice in the garden? Go ask Eliza.


May 23

Mike Stunes and John M decided that since the Citgo sign works so well, it needs to be permanently powered and placed to face the viewing window. So first they took it off the roof where it's normally located...
...and Mike set to work wiring up a power supply for it.
John M brought in an LED-powered vehicle tail light, to use in a proposed new grade crossing signal for demonstration purposes.
12 milliamps is its normal "tail light" mode, and it's not very impressive.
At 165 mA, which is its stop/direction mode, it becomes much more powerful.
John P worked on plywood for the upper level. This joint is where the transition from flextrack to handlaid track will occur.
And this one will join half-inch to three-quarter-inch plywood.


May 31

John P worked on Section 15 of the helix, where the tracks branch off to Sawyer and the interchanging railroad. A tighter than standard curve is required, but "It's not our railroad".
Just to see it in place, here are rails all the way onto horizontal plywood.
This is a check of the levels for the return loop for the foreign road. We're going to need tracks at multiple heights on that bracket.



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Tech Model Railroad Club of MIT
MIT Room N52-118
265 Massachusetts Avenue
Cambridge, MA 02139

+1 617 253-3269
x3-3269 (on campus)
Email: tmrc-web@mit.edu
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