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| Building a 31/2" Gauge Locomotive Engine |
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| NickG:
Well done Stew, That is looking mighty complex! :smart: Nick |
| sbwhart:
I thought I'd give a bit of an update on the remake of the rocker arms, as I'll be short on shop time for the next week. :(, I originally toyed with the idea of making the rockers out of one piece instead of fabricating them, for the remake I went for the one piece option. The most suitable material I had in my stash was from a garage door (thanks Ralph :thumbup:) First job cut a chunk out with an hacksaw:- cutting on the forward stroke helped along with a bit of oil. After half an hour and a sore arm this is what I got Roughed to size in the mill :- Bloody tough stuff Ralph blunted two cutters :hammer: Note crib sheet to help keep things on track. A bit of milling and drilling and filing and job complete. Note the difference with the first attempt made to drawing the second attempt may look different but all the critical features are correct and fit for purpose. Any one who,s worked in a design office will tell you one of the most important things is to recognise the functions and importance of each feature:- Critical to function, Safety critical, Critical to appearance, Minor to function, Minor to appearance etc etc I seemed to have spent an age assembling and unassembling things the cylinder is held together with 60, 6 ba and 7 ba screws and washers, I've been busy with not a lot to show for my activity, any way I've packed the pistons and glands with PTFE packing and assembled the cylinder into the frame so that I can measure up for the reversing linkage which will be the last thing to fit before I set the timing and give it a try. As for setting the timing I've no idea how to do it I'm going do a bit of reading about it first and then have a go. This is the assembly so far Have fun Stew |
| Darren:
You know something Stew... Your arms didn't look that big to me....all this sawing and filing we should be calling you Popeye...... maybe I'm just lazy.... Very nice work, as usual...... :clap: |
| Divided he ad:
Nice Job Stew :thumbup: Them there black arms are mighty strong stuff alright, they are what I used to make my ball turners tool posts from :) They are a very nice shape and would appear to me to have the benefit of a wider bearing section to spread the load, thus helping to reduce wear, I think :scratch: (with a good helping of oil etc obviously) Really looking forward to the running tests :D Ralph. |
| sbwhart:
Setting the valve timing :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: :bang: I guess that just about says it. I've been trying to set the timing for nearly two weeks now, along the way I've put few things right:- catching pins: Valve chest drawing error that lost me 1/8" of throw: Reversing arm slipping: Eccentrics slipping, etc etc etc, but I just can't seem to get it right, I've read and re read the build manual tried putting a different interpretation on what it mean by forward dead centre and back dead centre:- checked things: eccentric throw, length of arms, action of reverser etc etc, but I just can't to get working or get things to stay put, one minute thing turn over nice then it jams up and throws thing out. I'm sitting writing this with a can of draft GUINESS :beer: to drown my sorrows. :( Decided to put it to one side for a few days, and then go back to stage one strip it down and carefully build it up again checking everything out. Down but not beaten Stew |
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