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| Slowly casting up parts for a steam twin marine engine |
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| Artie:
I have all good intentions and yet it seems like a long time since the last post. Anyway Have finished the slot on the second reversing plate and am now in the process of mounting holes and profiling... the pics will tell the story.... Slot done and reversed in fixture for access with the file and then sandpaper.. Then flip and do the other side... Back into the jig to crop it to size. (those are office worker hands by the way... looks good!) To ensure that all holes are located the same from plate to plate...simply spot weld them together..this area will be removed later so it was the simplest way.... Drill, more filing.. and some judicial grinding... And we are ready for the filing buttons to complete the small radiuses (3 on each plate) Is this a 'lucky' fastener... or just a cock up? Ill call it a cock up.. anyway I hope to start on casting the base plate this weekend, more later.. rob T |
| Artie:
Well, today I have the second part of the crank done..... However... I wasnt really happy with the construction of the first crank section..... The alignment wasnt exactly right and Im going to un braze the solder and do it again... Ive been thinking about this alignment issue all week and how I could overcome it.... today I did something about it.... Like always, the jigs and fixtures take the majority of the time... In actual crank work, I reamed the holes a tad looser... and silver brazed them together.... this took about 5 minutes..... the fixtures took about 3 hours....... a couple of pics.... Firstly measured the width of the main and big end journals... and drilled some plate appropriatley..... Then I parted this off so I had two plates with identical hole spacing..... I had also drilled fixing holes and then tapped these and added a retaining plate... then clamped it all up.... This is a self aligning jig and this turned out extremely accurately, Ill definately do the first crank again using this method, just so easy although but very time consuming to initially construct. I also made a couple of sets/pairs of parrallels using the shaper and the surface grinder....limited pics sadly, just too busy while it was all happening. These are made of mild steel but are BLOODY accurate... not a bad alternative... Again sorry about the nil pics of the missing steps but I was really hurrying today... I had stuff which I wanted to get done.... time was short.... Might have more tomorrow... sadly no casting of the base plate..... Cheers Rob T |
| Rob.Wilson:
Hi Rob :clap: :clap: :clap: That's a great idea for lining up and holding the crank for brazing ,, reaming on the loose side will give room for the silver solder to penetrate the joint ,,, I will be using your idea on my next built up crank :thumbup: Nothing wrong with mild steel parallels ,,,, i make them up as and when i need them ,,, dose not matter if you drill or mill into them ,,, dose not break the tooling like the hardened ones do :doh: Rob |
| Artie:
Hey Rob, good to see you are still with us mate... thanks for the kind words... a little more...I did sweat the original crank apart and treated it the same as crank no.2, no pics cause it wasnt anything different from those that I have previosuly posted... I DO like the little crank jig, can recommend that one... I also got the base plate plug made and as seen here its got one coat of paint.... I did have high hopes of casting but ran out of time (again). Really nothing to report on it, as you can see by the following pics, its just a flat piece of board with the various features added to it. I started with 9mm flat plate and then used 3mm for the features with the rails/edges being balsa, the filler was plaster of paris, mainly because its quickly sandable and very EASILY sandable... in fact most of the dry shaping was done with my finger..... This will have the entire engine assembally mounted on it and the 6 lugs will be the points that it bolts to the hull of the steamer..... This is the seal coat and after its dry it will get a quick sand and then another coat... then we cast...... definately one night this week... Cheers Rob |
| Rob.Wilson:
Hi Rob I am still kicking :ddb: :ddb: :ddb: . That looks a good size pattern :bugeye: ,,,,,,,,,, looking forward to seeing it cast ,,,,,,,, :ddb: :ddb: :ddb: :ddb: Rob W |
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