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| RobWilson:
Go on Steve , nowt like a good lathe build :thumbup: Rob :wave: |
| Will_D:
Always confuses me: When you scrape do you scrape the white bits or the blue bits. Re. blue going everywhere: My old tube of blue was manky, 30 years old and more holes than a sieve. So, in next tooling order popped on a tube of blue. New tube, clean fingers! :beer: WRONG WRONG WRONG. They squeezed the order into a too small box and guess what suffered? Not the expensive steels tools in their plastic boxes! Oh No! It was the tube of blue on top of said hard robust plastic steel bits. It managed to unravel the tripel fold at the end of the tube :Doh: So now I haqve a BIG MANKY tube of blue! Note to newbies: Buy the blue in the tin not the tube. The tube may be bigger but you will be 300 years old when it runs out |
| vtsteam:
Well it kinda depends Will. If your part is blued, then you scrape the lighter bits. If the reference surface is blued you sort of scrape the blue bits, but it depends because it can also get into hollows behind the high spots so that way is cruder, and you have to think -- but if working down a general area early on, it's okay. First way is more definite. But I ran into the problem of the blue not rubbing off at all because my reference straight edge was so slick and the pressure so light it didnt remove the high spot blue on the part. So to start I went the other way, but switched back when I hauled my cast iron surface plate into the tiny shop heaved it onto the bench. Then I could get enough pressure and the plate was just a little bit rougher. All around better than the straight edge. So, am bluing the part, as normal -- or normal for me........ Second day of scraping..... |
| awemawson:
Steve, after the welding have you normalised the assembly, heat cycle or whatever. If not is it not going to carry on moving for weeks? |
| vtsteam:
Andrew, it is a bolted structure, not a full welded structure. the few small welds are there to prevent crossmember shifting and they were laid down in a careful sequence, with cooling betwween each, and were peened. I don't guarantee it won't move, but I think it won't (within the tolerances that are acceptable to me). If it does, I'll have more scraping to do down the road. I chose hot rolled instead of cold rolled to further minimize warpage from milling and scraping. |
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