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Most-Recent O Gauge Topics:

Zeke
Topics: 22   Replies: 20
posted on Jan 31, 2015:

Catching Up
jdcrawler
Topics: 32   Replies: 13
posted on Jan 29, 2015:

This project will be a court house, a fire department and a police department and has an interesting footprint for the buildings.
The court house is in the center with the fire department building attached on it's right side.
The small two man police department building is attached to the left side of the court house.

The base for the buildings is cut from a piece of re-cycled plywood.
It is fastened to a piece of paneling with wax paper in-between them.
The piece of paneling that the base is set on will be the paved parking area in front and behind the buildings.
When I glue the side walls on the base, I use wax paper to keep the glue from sticking to the paneling under the base of the building.




The fire department building is set back from the front of the court house so the fire trucks can park in front of the building and not be in the road.




The sheriff's office is added and the roof sections are made.
In the center is the back entrance to the municipal building.




My original design had round holes in the top of the tower on the corner of the fire station.
Each of these round holes were going to have a clock in it but I have changed my mind on that.
So I have filled in the round holes in the tower and put in one more window opening in the front of the tower.




Marie threw out an empty laundry detergent bottle the other day and the cap on the bottle caught my attention.
Using the cap as a base, I'm going to make a clock tower to fit on top of the municipal building.
Here are the parts for that tower that I have made up so far.




Here is the finished clock tower.




The porch roofs and steps are built for the rear entrance to the municipal building and the fire department.




The steps are done for the front of the police department and I've started on the front entrance for the municipal building.




As with the clock tower, the steps, porches and roof sections are all built separately to make everything easier to put the finish on them.
These items will be attached after the outside finish is put on the building.




I made up a hexagon platform on the roof of the municipal building.
This is the area where the clock tower will be positioned.




With the hexagon platform in place, the bay window is then fastened to the front of the municipal building.




Then I fit pieces of molding to the front wall to form the cornice molding.
Here the pieces are being held in place while the glue drys.




A single piece is cut from thin plywood and glued to the top of the molding pieces.
This adds strength so the pieces of molding won't brake apart and is wide enough to cover the top edge of the wood that is used to make the front wall.
A decorative molding piece is glued to each end of the molding to finish it off.




Here is how the finished molding looks.




The round base for the clock tower is fastened to the hexagon pad on the roof.




Here is a preview of how the building will look with these items in place.




The roof sections are painted and the chimney's, the air conditioning unit and the clock tower are installed.








I finished up the bell for the top of the tower on the fire department.








The building complex is completed.

















O-scale Municipal building
Balto&NY
Topics: 41   Replies: 33
posted on Jan 29, 2015:


Pennsylvania's recently shopped 2-8-2 number 9630 has stopped with a train of refrigerator cars.
A Jersey Central commuter train is about ready to depart Edgewater station on the Baltimore & New York Rwy. The yard crew is at work as well. A busy time on the B&NY!
Edgewater Yard on the B&NY
Dale H
Topics: 30   Replies: 30
posted on Jan 21, 2015:

Block signaling normally is a function of train position not time. That circuiting is discussed here using relays.and the outside insulated rail method. It is more prototypical than the one being described here. Please copy and paste this link to view

http://www.jcstudiosinc.com/BlogShowThread?id=577

However I was asked for a circuit which will give a timed yellow for a block signal with 3 LEDs, red,yellow and green. This can done easily with 2 SPDT relays,some diodes and 2 capacitors.

The diagram below shows a hookup for a PWZW. But can be used with most any transformer with an accessory tap.


The diode off the U of the transformer provides half waved rectification for the 3 LEDs. The half watt carbon resistor,1200 ohm or more protects the LEDs from over current. Larger values can be used to dim the LEDs if they are too bright. For block signals using light bulbs these could be omitted. Diodes across the relay coils are for spike suppression. The 2 diodes off the + of the bridge rectifier prevent the capacitors from sharing. 1n4001 or similar diodes are fine and cost a few cents each.

Note how the relay contacts are wired. In operation,if both relays are off,the LED is green.
If relay 1 is on and relay 2 is on or off the LED is red.
If relay 1 is off and relay 2 is on the yellow LED is lighted.
The B tap of the ZW is shown powering the relays and the LEDs but the C tap could also be used to power the LEDs separately.

The relay coil circuit is completed by the outside insulated rail method. (The train wheels complete the coil circuit whenever 2 or more pair of train wheels occupy the block) The relay coils can be 12 or 24VDC. For 12 volt DC relays the B tap would be set at 9 to 10 volts. For 24VDC coils the tap could be set at 18-20 VAC. I recommend 24VDC coils as they will not be accidentally burned out if the throttle is mistakenly pushed up too high. The 1 amp or more bridge rectifier provides rectification for the DC relay coils.

Capacitor 1 across relay 1 can be small 100 uf ,220 uf for example. The purpose of capacitor 1 is anti chatter and smoothing out the pulsed DC current to the DC relay coil. It charges the pulsed current to peak,voltage is increased by 41%.. So the 18 VAC becomes a perfect 24 VDC filtered with the bridge and capacitor. 10 VAC would become 14 VDC. So be careful if using 12 VDC relays. Attention should be paid to the polarity capacitors,as well as diode polarity. A backward diode will not conduct,or across the coil cause a short circuit. A backward capacitor will explode and make a smelly mess.

When the train wheels occupy the insulated rail section. both relays energize and stay that way until the train leaves the block and the capacitors discharge. But relay 2 will drop out after relay 1 if capacitor 2 is larger and stores more energy. Capacitor 2 across relay 2 coil now has the added function of being a timing capacitor. When charged it stores electrical energy and will hold open relay 2 when power is removed (when the train wheels leave the block) and result in the yellow LED staying lighted until the capacitor discharges,only then will the block signal will return to green. The amount of time depends on the characteristics of the relay coil (resistance in ohms) and the amount of capacitance. For a typical relay this is about 1 second per 1000 uf of capacitance. So a 4700 uf 35 volt one would give perhaps a 4 to 5 second yellow. For best results use relays with higher coil resistance,240 ohms or more. Avoid 12 volt automotive type with 88 ohm coils. Capacitors from 1000 to 10000 uf can be tried. 2, 4700 uf ones can be wired in parallel to get that value. High value capacitors,such as the ones used on relay coil 2 may induce some arcing on the outside train wheels when they first roll into the block and complete the circuit. This is due to the large inrush of current when the capacitor first charges. If this is a problem,simply install a half watt carbon 18 ohm,or 33 ohm or similar low value resistor in series with one of the leads to the capacitor. This is not shown in the drawing.

Dale
3 light block signal with timed yellow fo...
jdcrawler
Topics: 32   Replies: 13
posted on Jan 14, 2015:

Here are some of the parts for the house.
The porch post have already been completed.




The siding and roofing are printed on paper.
The papers are sprayed with a matte clear to seal them, then they are cut to size and glued to the building with a spray adhesive.




The finished building.









O-scale house
RogerPete
Topics: 8   Replies: 14
posted on Jan 8, 2015:

Each year I put up a large community train display. This year I built three accessories that the kids could activate, but now I need more ideas!
The accessories must be able to work unattended- meaning it does not require someone to attend it. I had an airplane, that the propeller spins, a fire station with doors that went up & down, and a Spider man that would swing out from behind a building, then back behind it. I can't have log loaders that need reloaded, coal loaders that need unloaded, stuff like that. What are the ideas for some animations that would go well in the public display?
Layout Ideas
RogerPete
Topics: 8   Replies: 14
posted on Jan 8, 2015:

There is something about an idea. You have something that you think about at night, so you take that idea, research it and develop it into a real product. After a life long interest in The Andy Griffith Show reruns, it seemed to me that the Mayberry Courthouse would be a great building in O gauge. I couple buy the plastic pattern sheets for the brick, but I couldn't find anything close for the windows or doors. So I came up with a design, sent it to a gent that does laser engraving, and I am pretty pleased with the final result. This is my prototype. I can make additional kits if there is an interest.
1st Custom Building
  


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O Gauge Member Blogs:

Zeke  (11) Dale H  (29)
jdcrawler  (23) Balto&NY  (39)
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Richard E  (41) RogerPete  (7)
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