Gallery, Projects and General > How do I??
PMR Coke Bottle Engine
rleete:
Bogs,
I'm happy to see that I figured the best method out correctly on my own. Shows I'm not a complete dunce at this, and may end up making an actual working engine.
bogstandard:
R,
You will be just fine, take it steady, think about it a lot, make a few notes, take small cuts to begin with, and all will turn out OK in the end.
It is just a matter of confidence and experience, and that comes with time.
Bogs
sbwhart:
Hi Chaps
It Looks like you'vr got the bottle sorted, castings can be a bit of a pig to get your head round, the first thing I always do with them is clean them up, take them in the house and sit and mull them over whilst watching TV, :scratch: Getting the datumn right is the first place is the most important, when you've done this every thing else sort of drops in place. : :thumbup: .
I like the idea of mounting it on a mandrel after you've got the base skimmed off, it can be a lose fit to get everything running true and you can put a centre in the end, this mandrel may be usefull for doing follow on machining, Tip:- try running through all the machining ops in your mind, working out as you go how and what you will need to do the job, you'd be suprized how often people get to the last op only to find that they can't hold the work :(
CrapOcad rules OK :headbang:
When you come to the fly wheel set it up so that the inside of the rim runs true, then skim the outside true that way you'l have a wheel that won't look wobbly.
Have Fun
:wave:
Stew
Bernd:
Bogs,
Did a scan of the print with the frame dimensions on it.
and
I'd like to call your attention to the number 4 with a circle around it on the second pic. The note associated with that states, "Cross head guide must be concentric and perpendicular to top of frame where cylinder mounts."
Just a bit more information I thought that might help.
Bernd
sbwhart:
Hi Bernd
Now that you'e posted a drawing I can see thats it a dinky little engine, I thought that you Chaps over the pond always suppersized every thing, or is that just the Burgers :lol:
It should make a real neat engine one that you can put on display the problem with big engines SWMBO kicks up a fus where to put it My beam engine tucked away on top of a book case.
Had a real good think about machining casting , see photo
1:- Hold in three jaw and skim up base. take small cuts
2:- Hold base in four jaw push base hard up against back of chuck or a stop. Get casting running true as posible, it may help to plug the bore with a piece of broom handle, we've got ral short brooms in our house, and mark centre. Face of and skim OD drill or bore 0.75 dia to size, this will make your datums.
3:- Make an arbour nice fit on the bore screwed both ends, you could also make a revereance washer again a nice fit on the 0.75 dia with a concentric OD that will clear the casting, you could use this to pick up off and find the centre.
4:- Mount casting on the Arbour on an angle plate or cube, mark it out bearing position slide face etc, you'd be suprised out usefull marking out can be if nothing else its a easy reference that you're machining is ok.
5:- Machine the base square to do this clean up one face losen mandrel set the clean face vertical to the table with a set square clean up second face etc etc:- if carfully done you should end up with a dead square base.
6:- Keeping the casting on this set up and using the square base you should be able to machine up the rest of the casting and everything will come out dead square a parralel to everything else.
I've added a few phtos of my set up for machining the sadle on a traction engine cylinder that uses this method you should get the idea.
Know get stuck in and make some swarf :whip: :whip: :poke: :poke:
Have Fun
:wave:
Stew
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