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| Remove Seized on chuck ?? |
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| Fergus OMore:
I'm merely reading the 'evidence' as reported. What there is an increase of heat which could alter cast iron and steel dimensionally. What is normal is that cast iron is cut roughly to size and then left to the elements to 'weather' before finish machining - and that finish machining is not the finish. Lathes 'move' and move. Somewhere, there is a note of someone building a mill. When I built a original Westbury, I had it all 'ticketty- boo' until I split the head stock- and it seized. I made a 'first 'Quorn' and split it- and had to make a second casting. The late George Thomas reported that his first Staking Tool pair of arms moved and now there is something called 'Mark11' castings. Sadly, no one seems to know when and why. about things but I'm not surprised any more. I'd merely want to avoid or minimise future problems for our poster. Regards Norman |
| mcostello:
I cannot help to believe that any kind of epoxy on the threads MIGHT come loose and make another similar problem when least wanted. |
| Manxmodder:
Epoxy putty,JB Weld or Belzona are all epoxy based metal repair pastes specifically designed for this type of repair. Providing the part to be repaired is properly degreased and has a good surface key then no problems should arise from this method. I have also made and used my own metal repair pastes using graded cast iron powder,brass powder, and bronze powder mixed with epoxy resin for various repair applications over the years.....OZ. |
| vtsteam:
JB Weld is also rated at 500 F, I believe, considerably higher than most over-the-counter epoxies which soften above 200-250 F. I've done some miracle repairs with it, and once built a thermostat housing for a Lister type diesel generator using the stuff instead of welding. It's still going 6 years later. Also a casting repair that has lasted 12 years in the pivot bushing area of my John Deere Model M tractor. The bushing area had worn egg shaped after wearing through the original bushing. I rebuilt it to original round and added a new bushing. |
| PekkaNF:
Is a little armchair engineering allowed? * As stated earlier this thread does not locate the back plate - would it be possible to turn thread off and replace the tread with flange/bushing type thread insert on the nose side of the back plate? That would keep the register intact, put the cast iron on compression when tightened and prevent rotation if this insert is pinned, glued or fastened to back plate. The question is: Is there enough room for it? JB weld and such: * To my knwledge threads are not leaded evenly and pretty often only few threads take up most of the load, that suggest that thread part is pretty unevenly loaded member and discontinuities will create probles? * JB welds et al. has very much lower strengt than cast iron, I think here it cover the blowhole and reduce ingress of dirt, but probably not doing much to prevent the cast iron from disintegrating next to it (fault). I think that It's pretty probable that same thing could occur again when a part of thread next to blowhole would collapse. Pekka |
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