Author Topic: Chris's Marion 91 Steam Shovel  (Read 287870 times)

Offline fumopuc

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Re: Chris's Marion 91 Steam Shovel
« Reply #4245 on: July 10, 2019, 07:41:16 PM »
Hi Chris, I feel  your pain about  the missing manpower.
Always a pleasure to follow your progress.
Kind Regards
Achim

Offline crueby

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Re: Chris's Marion 91 Steam Shovel
« Reply #4246 on: July 11, 2019, 05:27:23 PM »
Thanks Achim!  A hawk showed up and scared the elves back into the shop today, so they, um, I... are getting some more work done on the engine block.   :Lol:
Got the recesses in the side milled down:

and cut in the openings into the crosshead tube so the eccentric followers will be exposed, for the levers that bring the motion up top. On this engine I am trying the alternate approach that I considered on the crowd/slew engines, cutting all the way through from the outside towards the crank bay, rather than broaching the notch from the inside. The remaining metal is super thin anyway, so I will add that back as a panel on the outside.

Part so far, ready for cutting in the top surface to leave the bearing block bases for the valves and throttle.



Offline cnr6400

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Re: Chris's Marion 91 Steam Shovel
« Reply #4247 on: July 11, 2019, 08:06:28 PM »
 :ThumbsUp: :ThumbsUp: :ThumbsUp: :popcorn: :popcorn: :popcorn:

I thought the elves were scared back to the shop by the RC model submarine surfacing in the birdbath..... :Lol:

Offline crueby

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Re: Chris's Marion 91 Steam Shovel
« Reply #4248 on: July 11, 2019, 08:13:11 PM »
:ThumbsUp: :ThumbsUp: :ThumbsUp: :popcorn: :popcorn: :popcorn:

I thought the elves were scared back to the shop by the RC model submarine surfacing in the birdbath..... :Lol:
Ooh, gotta try that one!

Offline Don1966

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Re: Chris's Marion 91 Steam Shovel
« Reply #4249 on: July 11, 2019, 08:57:32 PM »
I can say one thing about you Dog is that your relentless ............ :ThumbsUp:



 :popcornsmall:
Don

Offline gary.a.ayres

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Re: Chris's Marion 91 Steam Shovel
« Reply #4250 on: July 11, 2019, 09:56:50 PM »
Some kickass machining going on here!

Offline crueby

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Re: Chris's Marion 91 Steam Shovel
« Reply #4251 on: July 11, 2019, 10:04:15 PM »
Thanks guys!
Got some more done this afternoon, took the top surface down to shape, leaving the bearing bases for the valve and throttle levers:

Part so far, ready to take the crank bearing face down:



Offline cnr6400

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Re: Chris's Marion 91 Steam Shovel
« Reply #4252 on: July 11, 2019, 10:22:43 PM »
That's a REALLY realistic gigantic hand, or that is one great looking really small crosshead guide!  :Lol:

 :cheers:

Offline Craig DeShong

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Re: Chris's Marion 91 Steam Shovel
« Reply #4253 on: July 12, 2019, 12:06:29 AM »
I'm voting for the giant hand  :lolb:

Fantastic work Chris.
Craig

Offline crueby

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Re: Chris's Marion 91 Steam Shovel
« Reply #4254 on: July 12, 2019, 01:29:55 AM »
Fe Fi Fo Fum,  that is the crosshead of a ... not.. Englishman!




This one is a lot smaller than the other two, less than 2 inches long. This engine was one of the main factors in deciding the scale of the model, wanted it small but still able to function.

Offline Captain Jerry

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Re: Chris's Marion 91 Steam Shovel
« Reply #4255 on: July 12, 2019, 05:00:33 PM »
In that context, I think the proper spelling is "Englishmum."


That is a good rule. Make the smallest part that you want to make, do-able. It often comes down to the fasteners. You are doing a good job of showing the limits.


Jerry
There are thing that you can do and some things you can't do.
Don't worry about it. try it anyway.

Offline crueby

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Re: Chris's Marion 91 Steam Shovel
« Reply #4256 on: July 12, 2019, 06:31:29 PM »
In that context, I think the proper spelling is "Englishmum."


That is a good rule. Make the smallest part that you want to make, do-able. It often comes down to the fasteners. You are doing a good job of showing the limits.


Jerry
Thanks Jerry! Others could make smaller engines, but this is about as small as I want to go, and this engine has to swivel the rear tracks with a fair bit of weight on them.

Why English'mum' though? Never heard that version.

Offline crueby

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Re: Chris's Marion 91 Steam Shovel
« Reply #4257 on: July 12, 2019, 09:24:33 PM »
Some more nibbling away at the engine block, sawed off the angle of the crank bearing block, then trimmed the last bit with the end mill:

and trimmed the top of the crank bay back at a slight angle to match the originals:

Now back to shaping the outside of the cylinder block. The center section needs to be taken in to leave the end flanges. Started by taking the bottom flat area down to size:

then setting up the arbor on the vertical rotary table again to shape in the curved section, ending where it meets the steam chest base:

One side down, one more to go...

Offline cnr6400

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Re: Chris's Marion 91 Steam Shovel
« Reply #4258 on: July 12, 2019, 11:55:12 PM »
 :ThumbsUp: :ThumbsUp: :ThumbsUp: :popcorn: :popcorn: :popcorn: and some for you too -  :popcorn: :popcorn: :popcorn:

Offline crueby

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Re: Chris's Marion 91 Steam Shovel
« Reply #4259 on: July 13, 2019, 12:51:44 AM »
:ThumbsUp: :ThumbsUp: :ThumbsUp: :popcorn: :popcorn: :popcorn: and some for you too -  :popcorn: :popcorn: :popcorn:

Munch... Munch...  :cheers: