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Air powered Draw Bolt

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chalky:
You need to put a cap on the top of the spindle with a hole in it to allow the top of the drawbar to poke though it. The drawbar itself needs a small annular ring around it near the top ( braze one on ) so that when the cap is fitted the drawbar cannot be removed from the spindle. Fit your taper in the usual way but when it comes to release just keep unscrewing. First it will be easy because you're simply unscrewing the drawbar from the taper but then the annular ring will hit the bottom of the cap and further unscrewing will jack the taper out of the spindle. Both my mills came fitted with captive drawbars but in the case of the smaller one it was a modification that the importer used to do himself. I may have some pics around somewhere but if not I'll go and take some in a couple of days. Not up to it at present as I'm still recovering from a nasty ( but innocently acquired ) infection.

chalky:
Just noticed the "Morse Taper Ejector on Clausing Mill" thread has pics which illustrate the principle of the captive drawbar. Not quite as convenient as "the real thing" because you have to remove the extractor after use, but still infinitely superior to the lead hammer.

sbwhart:
Chalky

Your post has just prompted me to check something out on my Siege X3, when the machine came it had this great chunk of metal that you had to unscrew to get your draw bar in, I just parked it to one side not knowing what it was:- its a draw bar ejector just as decribed  :doh:

Her it is against the draw bar



And with the draw bar wound back engauging with the ejector it work like a dream



Thanks for showing explaining this I'd have ended up making something out it and waisted a darn usfull bit of kit.

Slightly embaresed

Stew

Darren:
 :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh: :doh:

 :lol: :lol: :lol:

Spot on there Stew.....that will save a headache for you.... :thumbup:

chalky:
Hi Stew. You are not alone. When I bought my first ever machine tool,  a small mill, the importers used to fit a captive drawbar themselves. Took me a while to figure it out as there was no documentation, but eventually I got the hang of it. About a year later the importer stopped doing the mod to the mill. When I was on the phone to them I asked why they had discontinued what I thought was the most useful ever mod to the mill. They said that hardly anyone bothered to use it!! Reading between the lines they didn't, like me initially, realise what it was for. Captive drawbars are a great idea and should be standard on all mills, particularly those with MT tapers. As you can see I'm a bit of an enthusiast!

David

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