Author Topic: Stuck Collet Chuck Arbor (Read 78713 times)

ukazak · « **Reply #75 on:** March 24, 2012, 02:18:53 PM »

Quote from: DaveH on March 24, 2012, 01:07:00 PM

Unal,

How did you get on to day.

DaveH

Thanks Dave,
would you be so kind and draw this on profile wiev I want to make sure that I understan it truly... I would like to try this.
kind regards,
unal

DaveH · « **Reply #76 on:** March 24, 2012, 02:49:47 PM »

Quote from: ukazak on March 24, 2012, 02:18:53 PM

Quote from: DaveH on March 24, 2012, 01:07:00 PM
Unal,

How did you get on to day.

DaveH

Thanks Dave,
would you be so kind and draw this on profile wiev I want to make sure that I understan it truly... I would like to try this.
kind regards,
unal

Dave H (the other one)

I think this question is for you.

I think Unal is looking for a view to show how the two wedges are forced together.

DaveH

Miner · « **Reply #77 on:** March 24, 2012, 05:34:03 PM »

OK, This is slightly off the threads topic, And it is in no way directed at anyone, Or against Mr.Ukazaks understanding of what or how anything was posted. I'm not typing this out to upset anyone, Or to point fingers at all.

When any question is posted here it has to be taken at it's exact face value and answered with only the information that's given by the person asking the question. I personally can't relate to Mr. Ukazak's very difficult shop supply problems because I haven't had to experience that myself. He most definitely has my full sympathy now that I understand a bit more.

But if you were to go back and read this thread right from the start, Two of the people here posted their thoughts going only by the information given. Knowing far more about Mr. Ukazak's personal situation would have no doubt changed anyones opinions and points of view right from the beginning. So to again use some basic logic, I personally don't see anything anyone needs to, Or should have to apologise for. They saw the problem for what it was, And due to the lack of information. They simply responded in a logical way. It's very rare that anyone here posts anything here that isn't actively trying to give the best information they have. I think from what Mr. Ukazak has posted since, He himself fully understands that.

Everyone is fully entitled to their own opinion and this is mine. You can agree with it or not.

Pete

hopefuldave · « **Reply #78 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

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)

hopefuldave · « **Reply #79 on:** March 25, 2012, 08:29:32 AM »

One More Thing...

Put a piece of wood or something on the mill table, if/when it drops out there'll be a chuck and wedges etc. falling on it!

Dave H. (the other one)

hopefuldave · « **Reply #80 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)

ukazak · « **Reply #81 on:** March 25, 2012, 06:54:46 PM »

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)

Thanks a lot Dave,
Drawings are great, It is clear now, I will apply this and appreciated very much.

ukazak · « **Reply #82 on:** March 26, 2012, 06:37:04 PM »

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)

ukazak · « **Reply #83 on:** March 26, 2012, 06:38:30 PM »

The rig

hopefuldave · « **Reply #84 on:** March 26, 2012, 06:43:20 PM »

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)

ukazak · « **Reply #85 on:** March 26, 2012, 06:47:44 PM »

Thanks.. it set great on the chuck, I even put some grease on it... Havent tried yet. tomorrow is the big day! (I didnt have proper M16 wrenches..)

andyf · « **Reply #86 on:** March 26, 2012, 06:49:44 PM »

Unal, if that doesn't get it out the only other option will be dynamite.

Good luck! Iyi şans!

Andy

DaveH · « **Reply #87 on:** March 26, 2012, 07:02:37 PM »

Quote from: andyf on March 26, 2012, 06:49:44 PM

Unal, if that doesn't get it out the only other option will be dynamite.

Good luck! Iyi şans!

Andy

DaveH

hopefuldave · « **Reply #88 on:** March 26, 2012, 07:06:44 PM »

When the one at work let go, it *sounded* like dynamite, yes...

Dave H. (the other one)

ukazak · « **Reply #89 on:** March 26, 2012, 07:20:16 PM »

Yes, dinamıte would do it,Dave, but I cant use it in the shop because I have some flamable stuff in there

Stilldrillin · « **Reply #90 on:** March 27, 2012, 02:00:05 AM »

Good luck Unal!

David D

ukazak · « **Reply #91 on:** March 27, 2012, 02:16:05 PM »

Gentleman,
I thank you all, every and each one of you, for your valuable times and efforts to unsolved this problem… they are not wasted.

Special thanks to DAVE H. his solution worked like, spreading butter on your bread. Smooth and easy! Much appriciated!

Required some force but, no banging, no whacking needed. It made a “FLOPP!” voice and fall, (Thanks for the “warning” to cover the mills table with a flat MDF board.)

I think this solution would be recorded to the machinists’ literature.

ukazak · « **Reply #92 on:** March 27, 2012, 02:19:29 PM »

not much could be seen, dirt or rust or swarf... none was there..????
just a little scratch..

DaveH · « **Reply #93 on:** March 27, 2012, 02:21:59 PM »

DaveH

philf · « **Reply #94 on:** March 27, 2012, 02:25:20 PM »

Quote from: ukazak on March 27, 2012, 02:16:05 PM

Gentleman,
I thank you all, every and each one of you, for your valuable times and efforts to unsolved this problem… they are not wasted.

Special thanks to DAVE H. his solution worked like, spreading butter on your bread. Smooth and easy! Much appriciated!

Required some force but, no banging, no whacking needed. It made a “FLOPP!” voice and fall, (Thanks for the “warning” to cover the mills table with a flat MDF board.)

I think this solution would be recorded to the machinists’ literature.

Unal,

That's great news - I bet you're happy (and very relieved).

Looks like you made a very nice job of the tool.

Well done also Dave H.

Cheers.

Phil.

DaveH · « **Reply #95 on:** March 27, 2012, 02:28:55 PM »

Dave H (the other one)

Take a bow mate - you deserve it

DaveH

Stilldrillin · « **Reply #96 on:** March 27, 2012, 02:29:31 PM »

YAY!!!

Well done Unal, and Dave Hopeful.....

David D

Rob.Wilson · « **Reply #97 on:** March 27, 2012, 03:03:24 PM »

well done Unal

Nice one Dave

Rob

hopefuldave · « **Reply #98 on:** March 27, 2012, 03:49:18 PM »

No problem - I knew it worked for me, glad it worked for Unal!

I wish *mine* was as nicely made, though - I was in a hurry, needed to stick a 38mm drill through a casting and couldn't fit it in the drill! Three engineers before me hadn't managed it in ten years, took me a spare half-hour the first week on the job... Ho hum.

Just noticed the CAD drawing's a bit poor - one of the wedges looks hollow... I'll have to correct that!

Dave H. (the other one)

doubleboost · « **Reply #99 on:** March 27, 2012, 04:11:39 PM »

Well done Unal

You made a great job of the "splitter" at least no damage to machine or chuck

Dave
Many brownie points

John

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Author Topic: Stuck Collet Chuck Arbor (Read 78713 times)

Rob.Wilson