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| Fergus OMore:
Sorry Nick- wrong! Wrong engineering principles :loco: Looking at what your 'blueing' showed was that the high spots were in the centre of the clamps. To mess about with emery is simply going to make the whole- hole(sorry) even more barrel shaped. Quite correctly, you were advised to make and use an engineer's scraper. Properly applied, it would have removed some of the barreling in the centre of the clamps. Further blueing would have shown you the next step and where to scrape next. Ideally, you want the outer edges of the clamp to be doing the clamping and not what is now- a free air fit. Being of a lazy disposition, I would have got rid of most of this ring of offending metal with a rotary burr or stone but it would still bring me back to eventual scraping for an exact fit. If you read or ask about internal freehand grinding, you will get barreling which in your case will be more of the same. Apologies but I hope that this information will be of positive assistance. |
| MadNick:
Thanks Fergus, I feel positively assisted! And sincere apologies to daveH whose sound, engineering advice I appear to have completely ignored - I am no longer considering my brake hub assembly lol I dont have the facility to heat metal so will have to buy rather than make something :( Nick |
| Fergus OMore:
Problems, problems! Think about a triangular file and grind the three flutes hollow and then sharpen the edges. Far more awkward but then? Again, with a cheap worn out flat file, you can grind a neck about an inch or a bit more down. Then sharpen a cutting edge. It should look like a bloody big boring tool . Now where did I hear that- before? Again, old technology but it works. Cheers |
| MadNick:
Ill give it a go - I have a couple of old files in the scrap bin. We are looking at a radius cutting edge then? Any suggestions for dimensions approximately please... Nick |
| Fergus OMore:
Nick, I'd settle for something with an inch long blade itself but a gap longer than the depth of the clamp so that you can 'get in' comfortably and fettle the beast- once and for all. As for a cutting edge, you will have to do a sort of radius to avoid fouling but the edge need only be a 7-10degree cutting edge. A bit like a boring tool- as I said. Don't forget your gloves to avoid barking your knuckles! Said he with rubber gloves on-- and still picking out splinters out of his wizenned claws! Great thing- get a pair of surgeon's glasses. Mine came from a rather good orthodontist who realised her Pop had a white stick! It will be slow, but it works Cheers |
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