The Shop > Tools

Air powered Draw Bolt

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Darren:

--- Quote from: John Stevenson on July 02, 2009, 08:01:47 PM ---No nut, the chuck has a pull stud on the top, like that one you bought.
A hydraulic ram forces  a set of stacked springs down and a set of springy fingers grabs the chuck and pulls it in,

Imagine those long spring things for getting dropped bolts from inexesable hard to get places.

Push a button and air forces a big cylinder to push a smaller hydraulic cylinder that then goes to push the drawbar with springs on.

The springs actually holds the tool in so if it looses air or dry bollocks it doesn't drop the tool.

John S.

--- End quote ---

Ah, I did take a good look at that pip and guessed it was something like that. Are these draw bars obtainable, or are they like rocking horse......?

Does it have a name, to do a search..... :thumbup:

Darren:
Another one....looks good

This has the air cylinder inc, at this price you have to wonder if it's worth building your own...

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=280364743376&viewitem=&sspagename=STRK%3AMEWAX%3AIT&salenotsupported

The utube direct link for when the ebay sale has gone

dsquire:

--- Quote from: Darren on July 02, 2009, 04:43:09 AM ---I can't find it now, but someone in the US mentioned they had built an air powered drawbolt device for their milling machine...

Would you please care to expand?

Ta... :thumbup:

--- End quote ---

Darren

This might be the one that you are thinking about. There certainly are some good ideas in this thread.

Here is the link to Hoss ATC Project

http://www.cnczone.com/forums/showthread.php?t=43651

cheers

Don

Darren:
That's a very interesting concept. Using the lever system to increase the cylinder thrust was clever.... :thumbup:

Much to think about...... :coffee:

Bernd:

--- Quote from: Darren on July 03, 2009, 04:10:19 AM ---If I understand how an air wrench works (and I may have it wrong)
There is quite a big difference between lumping the spindle with a 4Lb hammer and the air ratchet shocking the draw bolt in a rotary fashion.
It's the air cylinder that provides the downwards pressure which is constant, ie smooth, unlike the hammer.

--- End quote ---

Ah yes that makes sense now. I do believe your right on that one.

If it's so hard to get out could it be that maybe your tightening the drawrod "to much"? In other words making it to tight.

Bernd

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