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| sbwhart:
Got up this morning bright and early nice and cool in the shed and the DRO work without a hitch, I think the problem must be temperature related, but the UK is not known for its high temperatures, you would have thought it would work at temperatures greater than 30 C. The bearing support is a tail of a cleaver idea coming apart. Squared up A piece of jig plate and fly cut it to the correct thickness. My idea was to make both out of the same part as mirror images, first thing I realized was that my co-ordinates on the drawing were all to cock, I seemed to have snapped onto the wrong point when doing the dimensions and they are a mile out so I had to go back on the computer and correct the drawing. Drilling the corner holes out went fine. Spot the deliberate mistake:-the two supports are not identical one has an extension for the cross head guide to fasten to, I went and put a 20mm drill right through it. :doh: I out cleavered my self with that one. :hammer: Ok make another one, just a single this time and leave the support untouched. Her they are waiting to have the rest of the unwanted bits chewed away. Stew |
| lordedmond:
--- Quote from: sbwhart on September 30, 2011, 04:35:12 AM ---On with the connecting Rod:- Cut a length of mild steel to length and put a sacrificial centre in each end. Then with the compound set over at 2.5 deg for the barrel shape Then onto the mill and mill flats on the ends had to use thin parallels for the barrel to fit in. Drill holes for the bearings This is what you get Cut the centers off then using filing buttons shape the eye at one end to fit in cross head. It's coming on next job crank shaft bearing supports. Stew --- End quote --- is that a small live centre in your TS ? if it is then where are they sold Stuart |
| sbwhart:
Hi Stuart I made it myselve using a CO running centre and a blank M3 morse taper. http://madmodder.net/index.php?topic=1208.0 Arceuro now sell them as a kit http://www.arceurotrade.co.uk/Catalogue/Centres. Stew |
| lordedmond:
Thanks for the info good build BTW |
| madjackghengis:
Hi Stew, I have to say the machining of the guide was very interesting, and very well done, particularly considering its complexity, and the percentage of it which remained when the machining was done. As a side note, should you need a boring bar for something that deep, a piece of steel tube or pipe, filled with lead or solder, with a solid end to hold a cutter will do very well at great depths with a sharp edge and light cuts. I also wanted to say how cunning and beautiful the con rod has turned out, very well done, both mechanically, for strength, and esthetically, looking like architechture. I am a big fan of simplicity, and of parts holding each other in place by the nature of their fitment. The inclusion of the CAD picture also helps put your work in better perspective and shows it off better as well. :drool: I think perhaps I need to quit working so I have more time to build engines and such for pleasure, but then I couldn't afford the tooling. I could sit and go through your log many times, over and again, seeing different details each time. I'm really looking forward to watching her run, I hope you do her on steam for the video :poke: I've got a small "boiler" from a carpet machine which I intend to use for a test boiler, as a proper engine should have a proper boiler, but I can't throw away a perfectly good boiler, when it could be used for test purposes. It is hard to say too many times, just how nicely she is coming along. :jaw: :bugeye: :bow: :beer: Cheers, mad jack |
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