Section 7 - Trailing Truck

The Delta Trailing Truck. May 2005 - Aug 2007
The delta trailing truck frame in cast iron. It has already been machined.
5-May-05 The next assembly to start will be the trailing truck. We start with the equalizing arms.
MikadoTrailingTruckAxleBoxes10May06 001
10-May-06 Here is a familiar process: rough boring the trailing truck axle boxes, after completing a truing cut on the face.
MikadoTrailingTruckAxleBoxes10May06 002
10-May-06 Checking the bore to match the bearings size.
MikadoTrailingTruckAxleBoxes10May06 004
10-May-06 Another familiar operation: turning a mandrel to mount on the angle plate to machine the axle boxes.
MikadoTrailingTruckAxleBoxes10May06 006
10-May-06 Milling the axle box openings using the same fixture techniques used on the main axle boxes.
MikadoTrailingTruckAxleBoxes17May06 002
17-May-06 Facing the front of the trailing truck axle box. A few tapped holes to mount the decorative box cover and we are done.
MikadoTrailingTruckWheels14June06 001
14-Jun-06 Now we get our chance to machine fresh cast iron wheels for the trailing truck. The four jaw chuck is used. We machine the back first, then rough bore…
MikadoTrailingTruckWheels14June06 002
14-Jun-06 Turning the trailing truck wheels. The outer diameter has been rough turned, along with the hub and tire thickness. We add the decorative relief to…
MikadoTrailingTruckWheels14June06 003
14-Jun-06 The two trailing truck wheels rough turned. We will finish turn the tread profile and finished thickness dimensions after they have been pressed on…
MikadoTrailingTruckWheels14June06 004
14-Jun-06 Facing the end of the trailing truck axle.
MikadoTrailingTruckWheels14June06 005
14-Jun-06 Using the height gage on the granite block to get the correct length since the 9" axle is longer than any verniers I have.
MikadoTrailingTruckWheels28June06 002
28-Jun-06 Turning the trailing truck axle between centers. Same process as we used for the main axles.
MikadoTrailingTruckWheels28June06 003
28-Jun-06 Lacking a micrometer carriage stop, we use an adjustable parallel set to the correct offset. The parallel was set using a micrometer.
MikadoTrailingTruckRockers5Jul06 002
5-Jul-06 Making a fixture to hold the trailing truck Rockers for turning. We did not want to disturb the setup in the big Bridgeport, so the little mill/drill…
MikadoTrailingTruckRockers11Jul06 001
11-Jul-06 The arbor for turning the trailing truck rockers mounted in the six jaw chuck. The chuck jaws are on the round portion of the mandrel. The quarter…
MikadoTrailingTruckRockers11Jul06 002
11-Jul-06 The rocker casting on the mandrel ready for turning.
MikadoTrailingTruckRockers11Jul06 003
11-Jul-06 The finished trailing truck rocker. Looks good!
MikadoTrailingTruckWheels12July06 001
12-Jul-06 Preparing to turn the finished tread profile on the trailing trucks. Earlier that weekend I used the hydraulic press at Joel's shop and pressed the…
MikadoTrailingTruckWheels12July06 002
Turning the 10 degree flange taper on the trailing truck wheels. 12-July-06
12-July-06 Turning the tread profile in the trailing truck wheels. This challenged machinist and machine, since this light duty lathe is not really rigid enough…
6-Dec-06 After leaving this section incomplete back in July while waiting for replacement brass parts to come in (I didn't want the aluminum parts originally…
6-Dec-06 While Bill was machining the rocker guides, I worked the slots in the rockers (labeled "right") with a file for smooth operation.
6-Dec-06 Another part to bolt on! That always feels good. The rocker guide (top) has been bolted to the tail cradle, the rocker positioned in the guide and the…
6-Dec-06 Machining the slot in the Rocker Bases.
6-Dec-06 The completed Rocker assembly.
30-Jan-07 After assembly, we find we have machine the pockets since the casting is slightly larger than the print,
30-Jan-07 Using round nose bit to enlarge one side of the rocker pockets.
30-Jan-07 Milling the rocker pad pockets out so the rockers will line up and have enough freedom of motion as required by print. The raw casting is a little bit…
30-Jan-07 Test fitting the trailing truck. More clearance is needed.
The truck looks good.
7-Feb-07. I've purchased some cup washers to use instead of the casing boss, so we machine the boss down and put a pocket in it for the washer.
14-Feb-07 Try #2 to widen the rocker pockets. Here we use a 5 degree taper mill that my brother gave me. We get the clearance we need.
The taper mill we used.
14-Feb-07 Squaring the truck frame to the table to add more clearance between the wheels and frame.
14-Feb-07 using a long bit to add clearance for the wheels.
Machining the spring hanger arms.
1-Aug-07 Machining the Equalizer arm again. This one is bronze instead of aluminum.
1-Aug-07 I was not convinced the original aluminum arms could really take the weight and wear, so I purchased replacement bronze arms from Bob Pederson at…
Checking the centerline and hole placement before drilling.
The casting had a slight twist in it, like all castings of long thing parts do, so we shimmed it in the vise to get the holes to line up where we wanted them…
Milling a slot in the one end.
A blurry action shot of the machining operation and the bronze chips shedding from the cutter.