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Quote from: Craig DeShong on February 15, 2019, 12:13:10 AMDave. Holding the casting wasn't a problem. The casting was solid (before boring it for the crankshaft journal). My problem was that the casting kept closing down on the slitting saw, seizing it, and jamming it in the cut slot. I was using a very slow speed, around 150 RPM. I guess heat was the culprit but I thought I was going slow enough and was using Plenty of cutting oil.It was a block of brass around one half inch by one inch cross section.Ahh got to wonder if its under stress. Perhaps a cycle to red heat under the torch before you start might get the stress out.
Dave. Holding the casting wasn't a problem. The casting was solid (before boring it for the crankshaft journal). My problem was that the casting kept closing down on the slitting saw, seizing it, and jamming it in the cut slot. I was using a very slow speed, around 150 RPM. I guess heat was the culprit but I thought I was going slow enough and was using Plenty of cutting oil.It was a block of brass around one half inch by one inch cross section.
And then there were two!! If you remember with the last update, I had uncovered an error in the drawings and was trying to determine what to do about it. I finally decided that another casting was the only solution so I contacted Bob Banke. .....Bob wouldn’t really confirm that the drawings were in error, but stated that he wanted the people that bought his models to have a good experience and if I needed another casting, he would send me one; free of charge.
Dave, Dave, Brian, Chris, Jason, Jo; thanks for your advice and comments. Everyone’s been so nice, but many of you MUST be thinking it: so I’ll say it. “You’d think that when the guy started boring the cylinders, and the bores were SO FAR OFF CENTER IN THE CASTING AND WERE SO FAR OUT OF ALIGNMENT WITH THE CORES, he would have checked the dimension????” Yep, you’d think wouldn’t ya; well live and learn; won’t make that mistake again.So as you can see, using the correct dimension, the cylinder bores center nicely in the casting. Now I can finish the cylinder liners, one of which has been waiting patiently in the lathe, partially finished, since the beginning of this cylinder dimension fiasco.
Dave: not beating myself up over this, just very disappointed I didn’t catch an error that I probably should have. Moving on.
Looking great now Craig. Just a little hitch, but good to hear the casting issue was resolved with such good service. Onward and upward now.Bill