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| sbwhart:
--- Quote from: spuddevans on August 18, 2009, 12:20:50 PM --- R.... But hang on, it spins a bit too freely :scratch: And it kinda wobbles a bit too :scratch: I immediately double checked the drill to make sure, yep it was 5mm. Then I checked the stainless rod with 1st calipers and then my digi micrometer, My next move is to get some 5mm silver steel, and then check the bearing blocks. I guess I can make up the baseplate in the meantime. Oh well, just goes to show that you can't always trust 5mm stainless to actually BE 5mm. Tim --- End quote --- Great work Tim you're really getting on with it. :clap: :clap: :clap: :clap: :clap: There are three main ways to make bar:- Hot rolled or black bar because its hot when they roll it its not highly stressed so won't move when you machine:- Cold rolled/drawn bright bar, they work it cold so you get lots of stresses built up in it: so when you machine and releaf the stresses it may warp:- size wise these methods produces bar thats nominally to size, Ground bar such as silver steel is ground closely to nominated size :- you can get ground mild steel bar as well. Have fun Stew |
| CrewCab:
Stew, thanks for that info on bars, I'll file it away for future use :thumbup: ............. Tim, annoying I know, but immediately your just working on sorting it out, well done :beer: CC |
| spuddevans:
Thanks for that info Stew :thumbup: and thanks for the support CC :thumbup: I was a bit annoyed about the undersize rod, but I'm over it now. These things happen ::) Could be worse, I could've messed up the main cylinder block :jaw: Tim |
| Darren:
Ball races sound nice........be a first on this engine I suspect..... :ddb: |
| bogstandard:
Tim, That rod definitely looks like it is imperial, 3/16" most probably. One thing I wouldn't suggest for the crank is silver steel. It goes rusty when you just look at the stuff. I always use ground stainless for mine. This engine will in fact take ball races with no problems, as it utilises a built up crankshaft. But if I was going to do it, I would use needle rollers instead of ball races, unless you can get some very thin walled races. You might also find, one needle roller would do in each bearing block, as if you used races, really they would require one at each end of the block. The choice is yours of course, that was just a suggestion. Bogs |
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