|Drawing No. 1
The footplate support bracket holes adjacent to the slidebar bracket
are too close to it. I had to thin my brackets to fit.
A means of supporting the front section of the footplate is required,
maybe two more footplate support brackets either side of the cylinder
The 3/16" dia cylcock shaft holes are too close to the cylinder
and need moving at 45 degrees as close to the edge of the frames as
possible. Because I had already drilled mine, I made a pair of brackets.
There is a picture on the "Assembly" page.
The draughtsman forgot to include a hole in the frames to access the
blowdown valve. I have drilled mine on the right-hand side with access
for an Allen key between the spokes of the rear driver.
|Drawing No. 2
||By-pass body overall length incorrectly labelled 1.1/8",
should be 1.3/8".
Pump and pump stretcher - ignore the 7/16" dimensions and use
the 8-hole PCD dimensions instead (0.442" for the 45 degree holes)
|Drawing No. 3
||The spring mounting holes in the toe of the spring brackets appears
to be incorrectly positioned on the drawing and need to be nearer
the centre to fit the cast springs. I offered up my springs to the
mounted brackets before drilling and spotted through accordingly.
Thanks to Alan W. for pointing this one out.
The driver's side wheel fouls the expansion link bracket when the
suspension bottoms out. See the "Assembly" page.
|Drawing No. 4
Slidebar bracket - the six frame mounting holes are 4BA, not 6BA.
Why do these lazy draughtsmen not put overall lengths of components
on drawings? Front rod is 9.202", rear rod is 7.265",
con rod is 12.208"
Return crank (as drawn) is 2.213" overall length.
The pins joining the front and rear rods need a screwdriver slot
in the rear to aid assembly / disassembly.
The oil pump platform needs to be extended by 5/16" to 2.9/16"
but the stiffening piece below stays as drawn..
|Drawing No. 5
||Sanity check - bogie frames 10.3/8" overall length, 5.3/8"
between inner bearing faces
Bogie stretchers - easier to use 6BA bolts to fix, with 3mm dia. holes
in frames and 6BA tapped holes in stretchers
Axle boxes - use sealed-for-life bearings, oil channels not required.
|Drawing No. 6
||Spring sockets 3/16" high
|Drawing No. 7
||The frame mounting holes of the footplate brackets leave the brackets
approx 5/32" too high. I have used 1.243" from the top of
the frames to the top of the brackets as the reference size. I have
made six of the short brackets and two of the long brackets.
|Drawing No. 8
||The valve spindle shows 7/32" x 40 thread, then specifies 2BA
nuts to fit.
|Drawing No. 9
||If using the expansion link bracket castings, the driving wheels
foul the underside of the castings at maximum depression of the suspension.
A cutaway needs to be made in the castings to clear the wheel (see
the Assembly page). The fireman's side bracket also needs a cutout
to clear the link at maximum throw.
|Drawing No. 10
||The blast pipe nozzle cannot be made as drawn. It needs to be made
as two parts and fitted / soldered together.
Reversing box - the centreline of the driven shaft is 19/32"
from the rear face, not 9/16" as shown. Updated below.
The width at the bottom of the pump operating lever is 9/64",
not 3/8" as shown.
The reverser box is rubbish and doesn't fit the space! I have remade
mine more in line with the prototype with dimensions that fit.
|Drawing No. 11
|Drawing No. 12A & 12B
||Not an error but it is worth making the inner girder span the full
length of the firebox crown. My crown deformed downwards a little
under the shell test pressure and full-length girders would have prevented
this. See the "Assembly" page.
|Drawing No. 13
||The major O/D of the small regulator valve is 3/8" dia, not
5/16" dia as shown.
|Drawing No. 14
||The snifter valve is shown with a 1/4" x 40 thread in the bore
and 3/16" x 40 on the base. This should be 3/16" x 40 at
the top ( with a 5/32" bore) and 1/4" x 40 at the bottom
to fit the 1/4" dia hole in the smokebox.
|Drawing No. 15
||Now drg no.15 but still printed with drg no.21 in the bottom right
|Drawing No. 16
||I have been advised by Alan W. that drawing 16 refers to the tender
but this may be a legacy from the Perrier drawings. My set, redrawn
by Gilbert, uses the Warnett drawings (see below).
|Drawing No. 17
|Drawing No. 18
|Drawing No. 19
||The smokebox footplate is drawn with the side mounting flanges projecting
downwards. They were upwards in full-size.
|Drawing No. 21
|Drawing No. 22
|Drawing No. 23
|Drawing No. 24
|Drawing No. 25
||One correspondent, Don, has reminded me that the Timken covers from
Blackgates are smaller than prototype. Adam Cro (see the Links page)
sells a more accurate version. The look of the axle boxes can be much