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Woodturning (rec.crafts.woodturning) To discuss tools, techniques, styles, materials, shows and competitions, education and educational materials related to woodturning. All skill levels are welcome, from art turners to production turners, beginners to masters. |
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Vacuum Chucking Tip
After finishing a bowl I mark the center of the bottom while it is still
on the chuck (I use an inside gripping chuck). I found a length of metal tubing that is the same diameter as the through hole of the headstock and installed a pencil inside the tubing (using masking tape to make it fit). I stick this through the headstock until the pencil point touches the underside of the bowl, then turn the bowl 1 turn by hand, while holding the tubing. If the pencil is centered it makes a dot, if not it will be a circle. To mount the bowl on the vacuum chuck for finishing the bottom, I bring up the tailstock and hold the bowl against the vacuum chuck with it, the point of the live center in the dot. As I turn on the pump I crank in the tailstock so that it remains in contact with the bowl until the desired vacuum is reached. This achieves a near perfect centering the first time. Clear as mud? -- Gerald Ross Cochran, GA Ambition is a poor excuse for not having the good sense to be lazy. |
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