Quote:
Originally Posted by Barrykgerdes
Drilling large holes in cast iron weights is not really a cheap action. A drill bit that size will cost the earth, then a drill to hold it another fortune. The drill probably won't get far before it will need sharpening.
It will be much cheaper to get a machine shop to bore it out on a lathe. I could do it but you are too far away. Although I am quite happy to bore out any weights that are brought to me. No charge.
Barry
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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.