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| vtsteam:
Rob! :beer: :beer: :beer: :beer: |
| vtsteam:
Still scraping. I did take a look at some Youtube scraping videos this evening to keep inspired. Things have changed since I built the Gingery lathe! There were no instructions on scraping at all on the internet in 2002, and I just followed Dave Gingery's book. Now there are a great variety of videos and many different tools illustrated, techniques, etc. That's helped quite a bit tonight actually, though I'm still not done with the bed after 3 days. Anyway, my instructions above were largely tongue in cheek, but if anyone really wants to know how to do it, there's a lot of good video instruction online and a variety of methods to choose from :beer: |
| Fergus OMore:
With increasing old age and infirmary(?), I gave up and for £250 ( I think) I got the bed of a Myford Super7B slideways ground and the very worn saddle built up with Turcite. It still leaves a fair amount to do. However, several points about my earlier efforts might be pertinent. The first-after machining, is a map of the job. The second is a scraping cycle. Probably third is to watch the obvious high spots- ruthlessly removing anything blued ( regardless of great accidents of excess blue). In other words, you should have blue areas ALL along the job. You might have several cycles to get there. Imagine little islands showing -when the tide goes out and as the tide recedes( ie scrapings) more islands pop up. With that done, it is time to break the islands into smaller pieces by knocking the tops of the mountains off. You are then getting this dots per square inch thing. The next cycle will expose a new island amonst the ones that you had seen earlier. Again, it is progressively time to work done the job all the way. I think that it worth a couple of mentions. The first is the constant re-honing of scrapers using diamond paste and the other is to lighly stone the work to remove the burrs from the scraper's cutting action. Anyway, that was my experience- for what it is worth. As a postscript( memory returning), I have a pair of rubber rollers which probably came from an artist's stencil set up. Two diffrent sizes and to use an ink pad. Whether or not, it helps is not known. Again, it is not mandatory to use 'blue' I have a tube of oil based Burnt Sienns artists paint as well as the 'Engineer's Blue' This might help those who don't quite pass the Ishihara colour test! Norman |
| vtsteam:
Fergus, I've been stoning between passes, and the engineers or "spot" blue I have (from 12 years ago) is running out. It has the mandatory crack in the side of the tube in order to squirt blue out onto the hand that feeds it! Well I'm smart enough by now to wear gloves for this. I have a brayer (rubber roller) -- was once an artist, and used to oil paints and inks (though they have better tubes -- usually tin, not aluminum). I have Prussiaan Blue oil paint if I run out-- though it isn't as strongly pigmentd as the "real" stuff. But usable. I don't have a carbide scraper, -- HSS. But for the amount of scraping I will do in a lifetime, the purchase isn't warranted. For the scraper I sharpen frequently with a Japanese water stone. This puts a very fine edge on it. The hard part is scraping a 3/4" wide by 26" surface and getting clean edge entry and end, and getting enough elbow room and foot space in a tiny shop for a position to do a proper cross hatch. I'm not ambidexterous. This is forcing me to be sometimes. But we're getting there. I predict it will be finished tonight. This is not the bearing surface, btw. The ways will be added on top of this. And that will be scraped, too. I just want it to have a good start. :beer: |
| Fergus OMore:
A 'Brayer'- well, I never! I'd got to things like 'Picker Buffers' from a very old firm that I had an association- for the spinning and weaving industry. My carbide scraper is no more than a big piece of scrap carbide insert tooling which is clamped to a traditional long ms shank. Happily, I have a decent diamond or two on a £100 T&C grinder and an undrilled faceplate on the lathe with diamond pastes( ex Vertex BSO dividing head) Nothing more exotic. So I'm following your your exploits with interest- and see an old man in a brown lab coat with completely black sleeves from iron dust and peering through a pair of Newcastle Brown Ale bottom specs and sweeping all the dustings away with both arms. :ddb: I'm sort of dreading scraping the green mould off my villa in Spain- I feel for your pain! Regards Norman |
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