2.5" Gauge Green Arrow Build

[stevendavis]

New mold printed and prepped for when the weather warms up some.

[Zephyrin]

the point with the 3d printed parts as models for casting is that I had to increase the size at the slicer, ( 103 % for alu & 105% for Zinc alloys) to cope with the metal retraction...as I don't like to modify the drawings.

[stevendavis]

Thanks Zephyrin.
I'll make sure to keep that in mind. The cylinders are oversize for machining; I just messed up on the first mold.

[stevendavis]

Tried a 3rd pour and it did not work out. I used petrobond for the 1st time and just didn't get it right. So I started machining the cylinders that I had with the original parts. So far so good. Used a tailstock mandrel to set the cylinder in the keets fixture.

[stevendavis]

Clean bores on both cylinders!

[stevendavis]

Did some initial machining on one of the steam chests I pourd and I believe I'll be able to use them.

[Kim]

They sure look nice!   

Kim

[stevendavis]

Thanks Kim,
Been following you on the clock build. Great work by the way!!

[stevendavis]

Got some work done on the valve chests over the week.

[stevendavis]

A couple more. I used a 3/8 four flute on the mill, after pre-drilling with a 7/32 and 1/2, for the procedure.

[Admiral_dk]

Good to see progress 

Per               

[stevendavis]

Good to see progress 

Per               

Thanks! Hope I can get a little in each week.

[stevendavis]

Got all the glan nuts done for the valve chests.

[stevendavis]

Got a little more done last week. Finished the steam passeges in the outside cylinders. I also got the lids and valve spindles made up. Made some blanks for the valves, but haven't finished them up yet. I pickeled one of the cylinders to clean it up, but it turned it a different collor. I'll probably do the other one so they match up, but it's probably not that important, as they will be painted down the road.

[stevendavis]

Spent some time over the holiday to get the caps machined. I didn't have a casting for the driving side, so I machined a couple up from round stock on the rotory table. The others end was machined up from a couple of PM Research castings.