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| Hobson H7 lathe |
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| parvum:
Hi All Thanks very much for your replies and sorry for the late response.The beast is all in bits right now and not fit to be seen, there will be a delay while my finger heals, I let it get eaten by a door. The T slot damage is two cracks on each side of the slot running from the edge of the cross slide to about one inch in and about 1/4 inch from the edge of the slot on both sides.With the compound at a right angle to the slide the tee bolts are clear of the damage, but to cut a taper one of the tee bolts would be in the damaged area, although the metal does not seem to have shifted and the "bits" don't move under finger pressure,the cracks are visible running through the thickness of the top surface of the slide.Am I being too anal about this as tool pressure should be downwards on the bolt nearest my side of the cross slide but sods law, upwards on the damaged area,albeit covered to some extent by the compound base. Is it worth veeing and brazing these cracks or do I risk distorting a fragile casting. Thanks again Paul |
| Arbalist:
Have you looked at this page Paul. http://www.lathes.co.uk/hobson/index.html |
| bertie_bassett:
rather then trying to braze the casting would some sort of epoxy be worth a go? might be able to force some down inside the crack which should hold things together well. and if not then you've not done any real damage to the casting |
| parvum:
Hi Arbalist Thanks for the reply First place I looked! Its a mine of information but not a whole lot on this lathe,nice pictures which were useful but no real info like spindle thread, looks like ACME pronounced flat tops to threads 1 5/8 diameter but 8 TPI need to make back plates to convert my Myford stuff. The geared headstock has some goo in it that was once lubricant, whats safe to use, EP90? or will that eat bronze bushes, the tailstock has been converted to self extraction and has some strange add on to the gib system but it seems to be OK. It has no motor fitted and I need to find out the motor pulley size to give the designed spindle speeds. Any info from other owners will be much appreciated. regards paul |
| parvum:
Hi Bertie Basset I wondered if the inevitable oil in the cracks would make an epoxy joint fail, as the cracks are still closed what would you suggest to degrease a these cracks in the casting or would a Locktite product like 603 be better?I certainly like the idea of a cold process that does not involve further brutality! |
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