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Andy
¿ªÔÆÌåÓýThanks for the explanation, John. It¡¯s many others as well who don¡¯t realise that newbies in this forum could be learning the hobby. My background is radio, electronics and test equipment, and when I saw the abbreviation ¡°TIR¡±, my immediate thought was Transmitted Infra Red. How wrong I was! Although I first used a lathe over 50 years ago (at school) for me it¡¯s just a hobby and I¡¯m still learning. ? Hope this hasn¡¯t opened a bag of worms! (an English expression, but is it used anywhere else in the world?) ? Best wishes to all, ? Andy B Near Southampton, England. ? From: 7x12minilathe@... [mailto:7x12minilathe@...] On Behalf Of John Best
Sent: 13 February 2013 13:24 To: 7x12minilathe@... Subject: RE: [7x12minilathe] Abbreviations ? ? Sorry Andy, TIR = Total Indicator Runout.? It¡¯s how much wobble you get on the dial indicator.? The less wobble, the more your system approaches a perfect circle running concentric about the axis.? John B ? From: 7x12minilathe@... [mailto:7x12minilathe@...] On Behalf Of Andy ? ? Hi All, ? Would it be possible for abbreviations to not be used? As this is a forum for old timers and newbies, there are many of us who don¡¯t know what these abbreviations stand for. It doesn¡¯t take more than a few seconds to type the full name, and it would help greatly in understanding what you¡¯re talking about. ? Many thanks, ? Andy_b Near Southampton England. ? ? From: 7x12minilathe@... [mailto:7x12minilathe@...] On Behalf Of John Best ? ? John, Great advice, but I offer a slight modification¡¡..? Remove the chuck and check the arbor runout on the internal taper.? I¡¯ve never been happy with the chuck mounting on those three studs, as it gets a new TIR every time you mount the chuck.? If I remember correctly, my 7x14 (from Micromark) gets better than 0.0005 TIR.? I¡¯ll try to re-check it later today. John B State College, PA ? From: 7x12minilathe@... [mailto:7x12minilathe@...] On Behalf Of John Lindo ? ? Not sure how much run time you have on your lathe. Check the front spindle bearing by placing a piece of board on the ways under the chuck (protection)? Put a piece of bar under the chuck and with a dial indicator and the stylus sitting on the top of the chuck,see how much lift you are getting. you maybe using the deep groove bearings as fitted standard to the lathe,maybe change to tapered roller bearings. At least you then can eliminate on of the variables,also check the 4 bolts pulling down the headstock are tight. ? John L Spain. ?
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