07-18-2009, 02:29 PM
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| | | Join Date: Jun 2006 Location: Stavanger, Norway
Posts: 1,925
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I think for anybody wanting to attempt this boring operation it would be a good idea to bore and hone the first cylinder undersize. That way you could check your technique for roundness and cylindricity and still have 7 more to practice on before doing it for real. If you don’t get it right after 8 practice attempts you can still take it to a professional shop and not have to junk it.
A DTI could be used as a comparator for roundness and cylindricity at different points on the circumference and the bore. The down side of this measuring technique is that it would only measure the sum of the machine and part errors. A way round this might be to use a home made ”plug” gauge on a rod, together with a set of feeler gauges. You could check at four different points around the circumference and at four different heights in the cylinder.
The guy that actually did the operation used a combination of the quill and feeding of the head. I think that if feeding the head produces an acceptable surface finish I would be tempted to use it for the whole 8” stroke. The quill gets very flexible when extended to 5”.
Phil   |
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