Hello Andy I have a Bridgeport with a Quillstar Mitutoyo scale on the quill it is very accurate to 0.0005" and I use it frequently for putting a cut on as it far more accurate than the knee,to get any more accuracy is going to be quite a challange, 1, Fly cutting is not the most accurate form of machining as even the back cut will probably take off more than a couple of tenth's due to spring in the tool, this is on the assumption that you can tram the head square enough to tha level of accuracy, 2, I have seen slim glass dro scales on a Bridgeport quill but to get the feel using the hand wheel and the feed clutch engaged in the neutral position will take some very light touch and a near perfect quill rack and pinion fit to maintain that accuracy. 3, And lastly I doubt even Bridgeport would say that you could get that sort of accuracy on even a new machine. Hope this does'nt destroy your attempt at the level of accuracy you are after but I think you are on a hiding to nothing to repeat it. Cheers Colin  |