Mystery steam engine

[chris123]

Jason, could you put a pitch circle through those centre holes and compare with the OD Chris gave in #251? This would help us to be more certain of the eccentric throws (that or throw us into confusion).

I am pretty close to having enough information to reverse engineer the valves.

I shoot another pic

 

[Jasonb]

Charles the size in #251 is the OD of the drive flange and what I scaled the photo to.

The ctrs when measured from that average out around the 1/4" or 6.35mm radius so 1/2" PCD which ties in with post #243 and the much earlier mention of 12mm

 

[Charles Lamont]

Chris, could I please have:
a width for the rectangular LP steam ports
the dimensions in plan of the trapezoidal valve chest
the bore diameter of the HP valve chest
the diameter of the valve rods
and this one may not be very easy, the distance from the LP valve rod centreline to the port face.

 

[GreenTwin]

and this one may not be very easy, the distance from the LP valve rod centreline to the port face.

Measure from the side of the rod to the port face.
Measure the diameter of the rod, and subtract half.

.

 

[chris123]

Chris, could I please have:
a width for the rectangular LP steam ports
the dimensions in plan of the trapezoidal valve chest
the bore diameter of the HP valve chest
the diameter of the valve rods
and this one may not be very easy, the distance from the LP valve rod centreline to the port face.

 

[chris123]

with of lp port

 

[chris123]

The trapezional opening got a top lip
Around
Do u need the dimension inside ?

 

[chris123]

The trapezional opening got a top lip
Around
Do u need the dimension inside ?

 

[chris123]

Bore of hp cylinder

 

[chris123]

Thats the valve rods

 

[chris123]

Actually the port with is
3.48 mm

 

[chris123]

Actually the port with is
3.48 mm

The lp port with

 

[chris123]

Now lp valve center to portface

 

[chris123]

Hi charles
Please let me know if i measured the right things for you
Or if u need more
Chris

 

[GreenTwin]

Isn't the valve rod located in the LP steam chest ?

As shown in this photo.

 

[chris123]

Hi green twin
Is it that what charles mean?

 

[GreenTwin]

That is my understanding of the question, but we can let Charles clarify.

.

 

[chris123]

That is my understanding of the question, but we can let Charles clarify.

.

I measure it anyway
Thank you green twin

 

[chris123]

Ok done
8.775mm

 

[Charles Lamont]

Here are the dimensions I am looking for: