I guess though that such a contraption would require that the dial indicator contacts the same area of the plumb every time, which is difficult to do given that it is hanging from a line (I considered making the line rigid but that brings its own set of complications).ĭoing a bit of trig, a plumb bob set at 1.2m high (about 4 feet) will detect a 90 second twist (0.022 degrees) by deflecting 0.5mm (just under 20 thousandths). My initial thought is that the pressure exerted by the indicator would skew results but then I guess that pressure is applied when testing at the head and tail stock so they should balance each other out. I am battling to determine in my mind whether that would work. I have seen some suggest to replace the plumb bob by something much heavier and then put a test dial indicator up against it to measure deflection. My intention is to use the plumb bob method to get it more out less there and then use a cutting test to finalise it. The room is small with only one door at the opposite end of where you the lathe is so still air is easy to achieve The guys I bought it from did level it when I bought it but as you said it would have settled by now. The lathe had been in its location for about three years now. Even heavy concrete floors can move enough to be measurable over some time. At that point you can probably start doing yearly double checks just to be sure nothing is changing. At a certain point you'll stop seeing any further changes as the bed readjusts to it's new position. I'd recheck after about a week, then a few weeks later and a month or two after that. After adjustments, the bed does take awhile to fully stabilize to that new position. And don't expect those level adjustments to remain stable even with a concrete floor. So cutting tests and those slight readjustments are then required.To save a bit of time I think I'd get the lathe as close to level as possible with a standard carpenters level and then start using the plumb bob. Any lathe I've done always required extremely small adjustments very slightly away from dead true to compensate for minor deflections within the machine under it's normal cutting loads. Done correctly with only a few thou between the two points most should be able to detect by eye a deviation to within a thou or two.But even on brand new unworn lathes, that "level" condition no matter how it's done is only a very close condition. I can't recall if Dale did so or not, but I think I'd start out machining a wide base 60 degree point to set just below that plumb bob point to have a visual check in two directions of where that plumb bob point is located once it's stabilized. Your correct in that the carriage can be used and it's what I do with a proper machinist level and for the reason you mentioned. It's one draw back is the time spent waiting for that plumb bob to fully stabilize, and there must be as little air movement as possible within the room it's being done in. You want to use it in combination of a visual as you walk up to the green.Yeah I've watched that Dale Derry YT video about using a plumb bob, and yes with enough height it should be a very usable method. It’s quick and easy and will save you time. If it’s a right-to-left putt, the shaft will appear on the other side. On putts that break left-to-right, the shaft of the putter should be to the left of the hole and will show you the degree of the slope. Third, you line up the blade of the putter with the ball. Second, hold the putter grip between your thumb and forefinger and you’re going to close one eye, for most, it’s the left eye. So let’s give a quick primer on plumb-bobbing.įirst, straddle the line of your putt, you’ll stand about four our five feet behind the ball and this may vary depending on the length of the putt. Players were running in 20-footers on a regular basis, maybe with the exception of Justin Thomas, who couldn’t buy a birdie on day one and made 18 straight pars. That was evident during the opening round. They should be, no one has played on them for nearly three months coming into this beautiful course located 35 miles northwest of Tokyo. It’s especially effective when you’re playing on bent grass greens, like the ones at the Kasumigaseki Country Club, the site for the men’s and women’s Olympic golf competition at these Tokyo games.įirst, the greens at Kasumigaseki are absolutely, positively perfect. It’s old school, for sure, but the tried-and-true method of reading greens that’s been around for at least 50 years is the good old “plumb-bob” technique.
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