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| Taper question |
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| kwackers:
Is your bed twisted? I can easily get that sort of taper by jacking the bed - doesn't take much. Assuming no bed wear (or little) then considering you've not had the lathe long it sounds like a possibility? The manual for my lathe goes into checking for cutting taper and explains how to adjust the jacking screws to correct for this. When I first got my lathe it cut taper and I was fairly suspicious of what the manual claimed - given the size of the bed it didn't seem likely that you could twist it enough. The twist was easily detectable with a engineers level, I adjusted it out and then machined a test piece as per the manual and did a few final tweaks. Result, no taper. The manual suggests machining a length of bar (fully supported by your chuck) at least 4 inches long. The centre of the bar is machined down leaving two 1 inch islands at each end. These are cut on power feed with a final cut of around 1 or 2 thou and then measured with a micrometer. |
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