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Air powered Draw Bolt

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Darren:
I can't seem to find much info on the Kurt unit?

Is it like this one?  http://cgi.ebay.com/-Air-Power-Drawbar-MILL-Bridgeport-Kurt-Maxi-Torque-A&T_W0QQitemZ290320215582QQcmdZViewItemQQimsxq20090528?IMSfp=TL090528152001r2775

John Stevenson:
Darren,
The secret to these thing is a 3/8" drive air wrench called a butterfly wrench.

http://www.machinemart.co.uk/shop/categories/search/air-ratchets-wrenches

4th down, £34.50

However for some reason the Yanks can get these from Harbor Freight at stupid prices like $15 when on offer.

http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=93100  $20 at the moment

[EDIT] £20 on Ebay inc postage if you do a search for Butterfly wrench.

This type of air wrench allows the forward reverse mechanism to be remotely controlled. Bob Warfield has one of the best sites for explaining it

http://www.cnccookbook.com/CCMillDrawbar.html

John S.

Darren:
Thanks John,

I think Bob Warfield has done a pretty good site on the subject and it looks simple enough to build.

Those darned Yanks don't know how lucky they are. For the last decade and a half they have been able to get things at about half the price we have to pay for the same things.
No wonder they have big workshops AND fill them with quality tooling....just not fair.... :(

I remember when I wanted to buy a brand new Japanese sports bike about ten years ago , 10K here, 4.5K over the pond.....it upset a lot of people at the time and eventually the Grey Import scene started by importing from the US instead of Japan. We still paid more than the US, but prob saved about 2-3K all the same.

And now they complain about petrol prices......... :doh:

Try about $9 a gal....it's getting tough over here. In this area the roads are far, far quieter than they used to be cos people just don't use there cars like they used to. Inc me, my car goes out about once every two weeks now and I run on Gas not petrol.



I'm not really wining, just jealous..... :)

kvom:
Darren,

That eBay item is the Kurt; mine is a similar clone (no labels on it).  It has its own drawbar, and the cylinder mounts on top of the mill.  The control unit consists of a regulator-oiler plus a box with two button, "in" and "out".  There are two air lines going from the control box to the cylinder.

To operate, I move the spindle to the top and engage the lock.  I then set the spindle brake and press the appropriate button with one hand holding the tool/collet with the other.  Takes about a second to either lock or unlock.

Darren:
Thanks, it sounds like you like the unit..... :thumbup:

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