kamar pisze:Kolejna nasza próba samobójcza

kamar pisze:mają gwinty co wcale nie pomaga w dokładnym ustawieniu

InzSpawalnik pisze:sruba moze sie wyrobic albo moze ja z(s)ciac moment obrotowy i masz te tulejke w oku badz w glowie !

comment by Dick Kostelnicek- HMSC Member

Upon reading about Joe Williams' offset turning technique, I wanted to know if I could determine the shim thickness directly from the desired offset. So, I did the math and came up with the formula: OFFSET = 2/3 SHIM THICKNESS. An example is shown in the diagram at the right. Incidentally, putting the same thickness shims on two of the jaws gives the same offset as a single shimmed jaw.

This formula is good for both hex and round stock as long as the round stock does not shift so far that it falls off the edge of a jaw's flat. Hex stock is more forgiving. Its flats, effectively, extend the contact with the flats on the jaws so it can take a larger offset than round stock of the same diameter. Although I haven't tried it, round stock less than 1-1/8-in. dia. could be held in a 5C hex collet block and offset with a shim against the block.

The new jaw opening for a given offset is given by the formula: JAW OPENING = STOCK DIAMETER + OFFSET. In the case of hex stock, use across-the-flats as the stock diameter.

Joe measured his shim thickness as 0.055 in., which calls for an offset of 2/3 x 0.055 = 0.036. His measured offset was 0.033-in.

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