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| Checking a 45 degree square? |
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| loply:
Dave, thanks for that, I think I get it now. I have some nice old cast iron which is about 22 or 23mm thick which I think I can cut up for it. I made a thread some years ago about making my other scraping tools - it's here - http://madmodder.net/index.php?topic=9039.0 they were made in 2012/2013 mainly from a large old milling cube which I cut up. I bought a nice Mitutoyo indicator which has 2 micron increments at the time that I made those, the markings are quite nicely spaced so you can split an increment quite easily. Was expensive but I have lots of machines I intend to rescrape (ONE DAY!) so I figured I will use it over the next 20 years as I gradually do them all :D Obviously it's no good measuring a scraped surface directly as the scrape marks are up and down, but I tend to lay a small ground parallel on top and measure off that. Even touching the parallel makes it bend though so I tend to lay things down then leave them to sit for a bit before taking the reading. Probably the biggest limiter is my surface plate, the inspection report said that it varied by 0.3 microns from one corner to the other, but, it's an import and who knows how truthful that is. |
| Fergus OMore:
Thank you- most impressive. I am sure that you will enjoy using your tools. I'm afraid that my tooling is far more crude looking and I haven't 20 years left to improve things. Enjoy Norman |
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