Quote:
Originally Posted by pmrid
I've tackled this with 10Kg and 5Kg weights from a sports shop. The steel is amazingly hard and very tough on cutting bits. In the end, the bargdest task was getting the lathe chuck jaws to grip the weight firmly enough to be able to then drill out the hole. Managed to cut a shoulder on the side of the weight and got a grip sufficient to then carefully and slowly open the hole. By way of a locking mechanism, I put the weight in a a 45 deree angle and drilled and tapped a hole into the centre so it would take a suitable bolt to lock onto the shaft. The weights tehmselves were relatively cheap but the time and trouble involved in opening the hole made it a marginal solution at best. I'll throw up some images if anyone wants them.
Peter.
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Yes the toughness of some of that cast iron (old gas stoves etc) is very hard on cutting tools.
I can get 10" diam into a 4 jaw chuck, 7" into a 3 jaw. Anything larger would require a jig up to about 16"
Boring will require a tipped tool and done at a relatively low speed. I would also need to make a similar offset in the drill press to fit a locking screw.
Barry