Greenly’s Hudson: Difference between revisions
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The spring for the axle box seems off. No. 8 gauge is either 0.129 inch diameter or 0.169 inch diameter. If there are 10 coils over 1.5 inches then the spring is already fully compressed (eg 10 x 0.129 inch = 1.29 inch) | The spring for the axle box seems off. No. 8 gauge is either 0.129 inch diameter or 0.169 inch diameter. If there are 10 coils over 1.5 inches then the spring is already fully compressed (eg 10 x 0.129 inch = 1.29 inch) | ||
=== Gear Frame === | |||
AH 6 - Is the hornblock screw modeled correctly - see the countersink in the main frame. | |||
[[File:Greenly Hudson AH6 HornblockScrew.png|thumb|center|500px|AH 6 - Hornblock Screw]] | |||
=== Smokebox Door === | === Smokebox Door === |
Revision as of 18:37, 22 December 2022
Jim Mullner
March 2022
Drawing Corrections
Eccentric Rod Length
Error noted on drawing AH8 - eccentric rod is 11-1/8 inches long not 10-1/8 inches long. I spent about 3 hours chasing it down today. I would hate to build this without first modeling it entirely in CAD. I had to scale the print to find the error.
Rod Interference
Found another fairly obvious interference issue. The reversing shaft interferes with the coupling rods (see drawing AH14).
I had just completed an animation of the Baker valve gear when I noticed it. The Baker valve gear was a quality job except for the eccentric rod and drop arm.
Axle Box Pivot
AH 6 - How long is the axle box pivot rod? This has the spring on it.
The spring for the axle box seems off. No. 8 gauge is either 0.129 inch diameter or 0.169 inch diameter. If there are 10 coils over 1.5 inches then the spring is already fully compressed (eg 10 x 0.129 inch = 1.29 inch)
Gear Frame
AH 6 - Is the hornblock screw modeled correctly - see the countersink in the main frame.
Smokebox Door
This is not an error, per se, but worth noting. Greenly's drawing number AH20 is a bit sparse, but it looks like there are two working dogs, and those are at 3 o'clock and 9 o'clock. The other dogs are just lining up against the edge of the door and do not actually clamp it down. Perhaps the intent was to make it less tedious to open the smokebox door. British prototypes use a single rotating locking mechanism on the center of the smokebox door, so it appears this was Greenly's solution to simplify access while retaining the look and feel of the American prototype.