Hello Meredith, Dick, Chris I rechecked the wire hinges coming from = mine. I do not have a micrometer, but there is one wire per hinge = (black) which is relatively rough and not shinny like piano wire but = just as springy. I suppose it is steel wire and smaller in diameter = than that used for a paper clip. Now, I am beginning to under stand = that this must not be original to the unit and should be a flat flexible = hinge instead. Perhaps that is the reason I have been having so much = trouble getting the seismometer boom to remain centered. =20 James Allen ----- Original Message -----=20 From: meredith lamb=20 To: psn-l@................. Sent: Tuesday, August 19, 2008 9:29 PM Subject: Re: SPRENGNETHER 201 LONG PERIOD VERTICAL SEISMOMETER James, Am sure your round wire hinges (one per each hinge, or more?), that = whomever had the vertical before you substituted the round wire they = had, for the (probably broken) original flat springs therein. Evidently yours works ~ as is. = Mine came with similar round piano wire/s; but they had like 4 wires of = ~ 0.025" diameter; per each of the two hinge clamps (eight total), which I replaced with = flat springs....which also ~ worked...but, I still don't know the = original flat spring width/thickness. Its interesting the variation of wire/flat springs that do work....but = whether they are really even near ideal is literally unknown. If this = spring pivot spring is too stiff/thick, the mass response won't be as enertially responsive as it ideally should = be. =20 Your second sentence below leaves me pondering whether its some ~ (not = a normally spring) metal rod/s used? It should be 0.025" diameter piano = wire....for initial setup flexuring=20 that it will go through in the process, and for simple high strength = when the spring is strung. I suppose you could use all the loose = locking 1/4" rods to hold the boom; and use a fine file edge (single light stroke) to see if it very = strongly resists filing like piano wire does, or; is relatively ~ easily = filed like iron etc. Another clue; piano wire is ultra smooth; a typical metal rod will feel like a drag = on your fingers when lightly run over. "IF", the "straight length" you = mention is bigger than 0.025", the previous owner may have removed acouple parts to accomodate their = "reengineering"....and you have to live with such.=20 Take care, Meredith =20 On Tue, Aug 19, 2008 at 6:59 PM, JAMES ALLEN= wrote: Meredith and Dick My Spremgnether has two hinges made out of wire and looks like thick = piano wire about 3/4 the thickness of pencil lead. Additionally, = instead of wires being attached to each ends of the spring attachments = each end of the spring has a straight length that goes into the = adjustment nuts. James Hello Meredith, Dick, Chris I = rechecked the=20 wire hinges coming from mine. I do not have a micrometer, but = there is one=20 wire per hinge (black) which is relatively rough and not shinny like = piano wire=20 but just as springy. I suppose it is steel wire and smaller in = diameter=20 than that used for a paper clip. Now, I am beginning to under = stand that=20 this must not be original to the unit and should be a flat flexible = hinge=20 instead. Perhaps that is the reason I have been having so much = trouble=20 getting the seismometer boom to remain centered.James Allen----- Original Message -----From:=20 meredith lambSent: Tuesday, August 19, 2008 = 9:29=20 PMSubject: Re: SPRENGNETHER 201 = LONG PERIOD=20 VERTICAL SEISMOMETERJames,Am sure your round wire hinges (one per each hinge, or = more?), that=20 whomever had the vertical before you substituted the round wire they = had, for=20 the (probablybroken) original flat springs therein. Evidently yours = works ~=20 as is. Mine came with similar round piano wire/s; but they had = like 4=20 wires of ~ 0.025" diameter;per each of the two hinge clamps (eight total), which I replaced = with=20 flat springs....which also ~ worked...but, I still don't know the = original=20 flat spring width/thickness.Its interesting the variation of wire/flat springs that do = work....but=20 whether they are really even near ideal is literally = unknown. =20 If this spring pivot spring is too stiff/thick, themass response won't be as enertially responsive as it ideally = should=20 be.Your second sentence below leaves me pondering whether its = some ~=20 (not a normally spring) metal rod/s used? It should be 0.025" = diameter=20 piano wire....for initial setup flexuringthat it will go through in the process, and for simple high = strength when=20 the spring is strung. I suppose you could use all=20 the loose locking 1/4" rods to hold the boom;and use a fine file edge (single light stroke) to see if it = very=20 strongly resists filing like piano wire does, or; is relatively ~ = easily filed=20 like iron etc. Another clue;piano wire is ultra smooth; a typical metal rod will feel = like a=20 drag on your fingers when lightly run over. "IF", the = "straight=20 length" you mention is bigger than 0.025",the previous owner may have removed acouple parts to accomodate = their=20 "reengineering"....and you have to live with such.Take care, MeredithOn Tue, Aug 19, 2008 at 6:59 PM, JAMES ALLEN = <jcallen1@...........> wrote:
Meredith and DickMy Spremgnether has two hinges made = out of wire=20 and looks like thick piano wire about 3/4 the thickness of pencil=20 lead. Additionally, instead of wires being attached to = each ends=20 of the spring attachments each end of the spring has a straight = length that=20 goes into the adjustment nuts.James