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91
Vehicles & Models / Re: Chris's Marion 91 Steam Shovel
« Last post by crueby on January 21, 2019, 08:02:01 PM »
Getting close on the timing - the new linkages are working quite well, but I drilled the left control arm pivot holes just a little too far apart, and the links are not even with the right hand ones. So, need to drill another hole slightly lower and hope to finish the timing.

Both cylinders needed the valve center adjusted a bit - I did the right one first, and removing/replacing the steam chest cover was a pain in the elves patooties since the steam chests face each other and the backstay rod is between them. Need to find a mini ratchet handle for my Wiha sockets to get into narrow spaces at a right angle. Got that one adjusted, back together finally, and was about to start on the left side one when I noticed that I could just see the bottom of the valve through the exhaust port! That one went much quicker, using a magnifier headset and a light to see into the port, could just see the inside edges of the d valve at either end of the travel.
Taking a break from it for a while, went and cleared the driveway again, will fix the control arm later or tomorrow...
 :cheers:
92
From Kits/Castings / Re: Stuart No 1
« Last post by Jo on January 21, 2019, 08:00:17 PM »
Thanks Kim,

Eric is also doing a bit of boring but someone told him size matters and he must have thought they were talking about boring heads   :facepalm:

Jo
93
From Plans / Re: Bruce Macbeth Engine, European Version
« Last post by fumopuc on January 21, 2019, 07:45:40 PM »
Hi everybody, a new experiment was done last weekend.
Milling a 197 x 98 x 10 mm aluminum plate without the usual fixture to the mill table.
The plate was fixed by some tape to a 20 mm victim plate ( is this the correct English expression ?)

A complete CAM program (G-Code) was created by Fusion360 for the whole job.
At the end I was happy about the result, even when it has been interrupted by a broken 3 mm flat end mill.
94
Chatterbox / Re: Not a model engine
« Last post by Roger B on January 21, 2019, 07:44:31 PM »
Wonderful  :praise2:  :praise2:  :wine1:
95
I've worked enough today. I can not find that sweet spot for the hit and miss action. I believe I have tried every combination of spring pressure on both ends of the governor pivot, have added weights, have taken away weights, and that bit of action seen in the last video was about the best hit and miss action I've had.  I may have to make a design change to something, but right at the moment I'm not sure what. One thing that I've seen, and seen repeatedly, is that the action of the rocker arm is so fast that the portion of governor which is supposed to interact with the rocker arm to hold the exhaust valve open doesn't have a chance to get in where it has to be to stop the rocker arm.--Hope you understood that!!! You can see a good example of what I am talking about in the last 10 or 15 seconds of the video. I have to think on this for a while.
96
Chatterbox / Not a model engine
« Last post by Jo on January 21, 2019, 07:41:47 PM »
...but something I do on a cold winter's night when I don't feel up to playing in the workshop  :)

 I think I'll do the beetroot eater one next   :thinking:

Jo
97
Your Own Design / Re: Longboy's "SUPER TEE" Model Gas Engine
« Last post by Longboy on January 21, 2019, 07:39:55 PM »
Thanks Chester. "SUPER TEE" is going to have a pretty different layout for inline I/C on its lower end. I like things just a little......and even a lot, out of the ordinary!   
   :stir:  Dave.
98
From Plans / Re: Bruce Macbeth Engine, European Version
« Last post by fumopuc on January 21, 2019, 07:31:48 PM »
Looks great Achim looking forward to the build and brass oh you know ........I..........like........  :Love:



 :cheers:
Don




Hi Don, good to know that you are still watching the European activities.
Enjoy the brass design as long as you can, but finally it will disappear under a coat of paint or powder coating, sorry for that.
99
Vehicles & Models / Re: Chris's Marion 91 Steam Shovel
« Last post by crueby on January 21, 2019, 07:30:47 PM »
Interesting development Chris.   I wonder why they put the engine weight over the front axle rather than over the drive tracks. :headscratch:     Terry
The rear area above the tracks was used as a cargo deck. Having the engine forward may have been to give the wheels enough bite to steer in the summer, not sure. I will ask Terry up there...
100
From Plans / Re: Bruce Macbeth Engine, European Version
« Last post by fumopuc on January 21, 2019, 07:27:22 PM »
More progress  :ThumbsUp: :ThumbsUp: Was the hole that 'failed' for lubrication?
Hi Roger the purpose of these 2 mm holes are more simple.
They are only for the fixation of the entire building for the soldering process.
But at this place with the shown mishap, not necessary, nothing to fix there.

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