| Gallery, Projects and General > Project Logs |
| Potty Simpson build - MZT |
| << < (2/4) > >> |
| mzt:
Stefan, David, Stew, Dave, chilled sections I MAY find a way to deal with, but voids? I'm staying as clear as I can from the workpiece edges, not to face this again: :jaw: YEP! The blank end was shaped like the finished workpiece needed to be, :ddb: "why should I not take advantage of that?" I kno' the answer. (too many icons would fit here). Dave, as for the softening trick, I've tried that a few times, with no success at all, on a barbel weight: but I don't think the problem was in the trick, that barbel weight was made of glaznium. Was fun, tho, seeing how easy it ate my (cheap) brazed carbide tools after each cooling down. Sandwik inserts had reason of it, when I got access to them: now it's a decent flywheel (with voids), sitting patiently in wait for an engine to be brought to completion. Had plans to try again with all the foudry scraps I had, last winter, but somehow I never got around doing so. Maybe next winter, now it's not the right season of the year for me to light the shop stove. Marcello |
| mzt:
Yesterday night I had a little shop time I wanted use for a quick drilling and tap-testing of a hole somewhere into that block. On second thought, I decided to take the longer, but safer, way of scribing FIRST and drilling NEXT. I seem to recall that random placed holes have the bad habit of getting in the way on later stages of the build. Being in haste, I hurried with rulers, squares and dividers for a while: had a glance at the finished mess and went looking for solvent and rag. Either I do it or do it not, doing it bad makes no sense. Decide to treat the thing as it were a casting (well, it IS a casting! Is it not?) and clamped it to an angle plate to set it vertical with all the faces square to the reference plate. Then brought into play my digital scriber and presto, got it done as precisely as I needed it. It took less than on the previous attempt, but I will never learn that. Here it is, scribed in one piece together with the base (for the moment, will decide what in due time). The blackened parts needing a complete removal however I will tackle the job, the encircled area showing the largest void I can see at the moment. No time for a second check of the dimensions, to say nothing about drilling. Maybe tonite. Marcello |
| mzt:
Got curious about using an hacksaw. Started with a groove about 1mm deep, little more than 1mm outside the end line, turned the piece into the vice 90deg, grooved again and so on till I made all four. Then, I deepened each of them to about half of the blade height, and finally the two on the 35mm faces down to full blade. Made the cut on both the large sides, reversing the wp. into the vice two or three times. Wasn’t sure about the pros and cons of mixing cast iron dust with the thick oil I had at hand, so I made it dry. It took less than an hour of hand powered machining, slow motion, caring to make use of the full blade length. Job ended before I was sweating. The cut was straight, close to perfection, and the ‘opening’ of the wp. revealed to me some nice fine grained cast iron. Made my day! The offcut went back to the metals shelf, You bet it. Marcello |
| Stilldrillin:
--- Quote from: mzetati on June 07, 2012, 06:06:50 AM ---Got curious about using an hacksaw. It took less than an hour of hand powered machining, slow motion, caring to make use of the full blade length. Job ended before I was sweating. The cut was straight, close to perfection, and the ‘opening’ of the wp. revealed to me some nice fine grained cast iron. Made my day! --- End quote --- Marcello. You're a fitter, and more accurate worker, than me......... :thumbup: Blummin, well done! :clap: :clap: David D |
| sbwhart:
Well done I bet you had a saw arms (pun) That off cut would make the steam chest. Stew |
| Navigation |
| Message Index |
| Next page |
| Previous page |