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Milling drawbar

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Dusty17/07/2011 21:07:56
498 forum posts
9 photos
Jon
I would suggest that you look at the fit of your morse taper, it sounds like you may have damage to the socket if more than one type of holder has dropped on you. Morse tapers are self locking and as such they should remain tight even without a drawbar. That is, provided the cutter or drill is not being subjected to undue force causing vibration. The drawbar is a safety feature, it does not need to be overtightened. Nipping up is perhaps an unfortunate expression as it means many things to many people. Nipping up is not just over finger tight, nor is it 30ft lbs on a torque wrench. I normally grab hold of the spindle pulley and with the spanner on the drawbar nut, tighten it until the pulley just starts to slip in my not to firm grip. Never had a morse taper drop or slip on me.
DMB17/07/2011 23:12:26
1585 forum posts
1 photos
Dusty,
Its well known taht a 2MT will part company under a milling load. I have had a 2MT tailsock chuck in mill for drilling holes + thats come loose. Mill or drill chucks just want jamming in by hand and drawbar gently tightened to prevent disasters. I find that Clarkson chuck some times gets stuck fast, possibly when using big (5/8") endmill or slotdrill, ss needing my type of drawbar to shove the tapers apart. BTW, I dont claim originality for it, I read a description of this somewhere - just passing on my knowledge.
John
Dusty18/07/2011 17:38:41
498 forum posts
9 photos
I still say that the basic problem is ill-fitting tapers and sockets ( I include in this swarf or other inclusions in the socket). I accept that a 2morse taper milling chuck could work loose as it is a small taper. If it has a drawbar fitted and and tightened it should never work loose, provided that the taper and socket are well fitted. A drill chuck or morse taper shank drill should not drop, as the force is going back through the drill and/or chuck pushing the taper and socket together. Most quality drilling machines use a 2 morse socket to mount the chuck, I do not know of any that utilises a drawbar, they do not seem to have a problem with the chuck falling out.
Clive Hartland18/07/2011 18:04:38
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2929 forum posts
41 photos
SPG Tools.com are offereing some draw bars, worth a look.
 
Clive
DMB18/07/2011 20:41:54
1585 forum posts
1 photos
Re Dusty`s post today. My milling chuck doesnt work loose as I use the drawbar to hold it secure However, on occasion, it has stuck tight but with my new drawbar as previously described, it is no problem to remove. I have used the tang - ended tailstock drilling chuck in the mill spindle to drill holes and its come down. Ido clean my tapers internal and external. I use a piece of soft cotton cloth to draw through, like rifle barrel cleaning.
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