Gallery, Projects and General > Oooops!
Stuck Collet Chuck Arbor
hopefuldave:
And yet another thing...
lubricate the bolt threads, and go up to about 65nM torque (50Ft/Lb) evenly, alternating tightening the two bolts - this should give around 75% of the safe load for a high-tensile 12mm x 1.75 bolt and nut, and about er... (gets the calculator out) 6 tonnes of tension, so with the wedge ratio of 1/tan 5degrees and allowing a 50% loss for friction, around 30 Tonnes of force between the spindle and the chuck taper - if that doesn't do it, time for a new spindle!
Dave H (the other one)
ukazak:
--- Quote from: hopefuldave on March 25, 2012, 10:37:57 AM ---And yet another thing...
lubricate the bolt threads, and go up to about 65nM torque (50Ft/Lb) evenly, alternating tightening the two bolts - this should give around 75% of the safe load for a high-tensile 12mm x 1.75 bolt and nut, and about er... (gets the calculator out) 6 tonnes of tension, so with the wedge ratio of 1/tan 5degrees and allowing a 50% loss for friction, around 30 Tonnes of force between the spindle and the chuck taper - if that doesn't do it, time for a new spindle!
Dave H (the other one)
--- End quote ---
Thanks a lot Dave,
Drawings are great, It is clear now, I will apply this and appreciated very much.
ukazak:
--- Quote from: hopefuldave on March 25, 2012, 08:10:24 AM ---OK Unal, hope these explain OK - the wedges are forced together by nuts and bolts through the bars either end, these are left "floating" as the wedges will move "up and down" as they're tightened - you could leave the bars out, but then you'd need to elongate the back part of the wedge and put slots through it.
Excuse my CAD drawing, knocked up over a cup of coffee before I woke up!
You may need to make additional split collars to take up any gap between the wedge and the spindle, unless you're very lucky first time! As you have a milling chuck in the spindle (and don't you just know it!) you should find these fairly easy to make :)
Thanks Dave,
I couldnt do much today, but made the parts... rig is ready, tomorrow I will tighten the nuts... lets see what hapens..
SO... in use, put the two wedges around the chuck's arbor (taper), bars at each side, bolts through and tighten away! I'd use large bolts, perhaps M12 or M16 to get plenty of force on the wedges...
Hope this works for you, worked well for me!
Dave H. (the other one)
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ukazak:
The rig
hopefuldave:
Very nicely executed, Unal!
They look better than mine, I have to say... But the big question is - did it work?
Dave H. (the other one)
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