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ted	06/11/2010 17:23:34
4 forum posts	hi all im new to this forum just quick question to forums member about draw bars sizes am i correct in thinking once a MT3 draw bar is metric that the draw bar thread is M12 as im going to order a set ER 25 /32 collet chuck set as im in ireland i wanted to be fairly sure before i order them from the uk,as some of the suppliers don,t say the draw bar sizes on their web sites.
Stub Mandrel	06/11/2010 20:21:17
4318 forum posts 291 photos 1 articles	I think my metric draw bar is M10 <checks> no it's M12, but 'your mileage may vary'. Neil
ted	07/11/2010 10:30:47
4 forum posts	hi neil thanks for your reply .i will wailted till some time monday and get on the telephone to one or two companys and ask them what is the thread size does their 3MT chuck takes.
Martin W	07/11/2010 11:39:21
940 forum posts 30 photos	Ted I bought a 'Metric' mill that has an MT2 taper but was supplied with two draw bars, one metric and one imperial which covered all the fittings I have bought to date but it made me aware of some of the pitfalls with regard to tooling fitments. I know that some 'Metric' machines are being offered with imperial threaded draw bars so it may be worth checking yours. I have had a quick look at MT3 taper ER collets from various well known suppliers and have found that there are at least four thread options on offer. These range through metric.BSW and UNF. If you can extract your draw bar then it may be worth measuring the thread diameter and pitch to identify the thread. If you don't have a pitch gauge then trying various nuts, gently , and you may be able identify the thread or at least eliminate some. Cheers Martin Edited By Martin W on 07/11/2010 11:44:36
ted	07/11/2010 12:57:53
4 forum posts	hi martin tanks for the information i have a milling machine too and the draw bar thread is M12 for a MT3 taper chuck ,i was looking at well known supplier site and their posilock collect system MT3 taper is tapped for a draw bar but doesnt give the draw bar thread for that collet chuck on their site .so i will e-mail them or phone them as i looked up the 27th edition machinery handbook and found no information about drawbars for MT3/ MT2 tapers chucks. TED
Bogstandard	07/11/2010 13:43:48
263 forum posts	Ted, You should find, in the UK, your drawbar thread for 3MT is either 3/8" Whit or M12. It pays to have both on hand as sometimes you can buy a bit of tooling that isn't your normal thread, and so having both, you can accomodate almost anything you come across. Bogs
John Haine	07/11/2010 15:06:16
5563 forum posts 322 photos	Threaded rod makes ideal drawbar - just buy what you need to fit.
John Olsen	07/11/2010 21:29:14
1294 forum posts 108 photos 1 articles	I find that I have to have drawbars in 10mm and 12mm metric, and in half inch UNC and Whitworth. Well, to be honest, often I don't find, the one you want is always being elusive.... The machine itself has MT4, but of course many accessories are MT3 or MT2. regards John

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