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Thread: disaster recovery or up grade
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24th March 2013, 03:42 PM #1
disaster recovery or up grade
I have a couple of Nova screw chucks that have stood me in good stead over the years. Well, finally one of them gave way at speed, shock horror. It was a small piece of Dead Finish around 5" dia, very hard and very solid and it caught me by surprise.
I had an old Holden ute axle from the 60's, so its become a new screw chuck much bigger with a thread of 20 mm dia or 3/4" and twice as long.I have no idea what the steel is, other than to say it turned slowly and proved to be very stiff steel. Some sort of high tensile steel with high anti-torsional twist capabilities
The chuck its sitting on is not the chuck normally I use with my screw chucks. Its an old SN2 5" dia with the large bowl jaws it gives you an idea of size.Inspiration exists, but it has to find you working. — Pablo Picasso
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24th March 2013, 03:57 PM #2
Looks like it's lucky you didn't suffer peripheral damages from that 'un! Nice job on the new one, too.
Any plans for an upcoming WIP on "how to remove broken screw chucks from Dead Finish"?
- Andy Mc
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24th March 2013, 05:30 PM #3GOLD MEMBER
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only one suggestion also a deeper pitch thread on the screw! I use coach bolts on my face plates and replace them every 18 month's regardless of how much work they have done! and use the chainsaw file to open up the thread. but bigger is better!
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24th March 2013, 08:03 PM #4
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24th March 2013, 08:49 PM #5
Neil, I am with Chuck on this one, the threads look like they are for threaded metal parts, not aggressive enough for timber.
Pat
Work is a necessary evil to be avoided. Mark Twain
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24th March 2013, 08:55 PM #6
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25th March 2013, 09:04 AM #7SENIOR MEMBER
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snapped screw chuck
Hughie,
For what it is worth. Snapped one about 6 months ago - and tried to use an easy out.
Couldnt budge it at all. Had to drill all around it and used the easy out hole with punch to move
it sideways (back and forth). Didnt do much damage, but reverted to the trusty faceplate & coach screws.
I guess the good thing is that you were not injured in the process only the pride, eh. Drillit.
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25th March 2013, 10:48 AM #8
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25th March 2013, 11:39 AM #9
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25th March 2013, 12:49 PM #10Skwair2rownd
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Looks like I'd best be careful with any Dead Finish I might be
(un)lucky enough to acquire!!!
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25th March 2013, 01:30 PM #11
Huey, one of my screw chucks has 25mm screw. Drill a 25mm hole with a forstner bit and on very low speed, mount the bowl to the chuck.
With all you fabrication experience, you'd be able to knock one up in a few minutes.
The lump is shown with the Woodfast Screw chuck for comparison.Pat
Work is a necessary evil to be avoided. Mark Twain
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25th March 2013, 01:33 PM #12GOLD MEMBER
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Hughie,
You might try one at 6 threads per inch / 4.5 metric pitch. Go in deep enough to leave just a bit of flat on top of the threads, then put the lathe in back gear and use a round file to get them deeper.
That should give you a nice course thread to bite the timber and deep enough to get a good grip.
What you have may work fine. Even if it strips out all that will happen is the blank will stop turning.So much timber, so little time.
Paul
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25th March 2013, 05:28 PM #13SENIOR MEMBER
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Good luck trying to screw that into hard wood like dry Red Gum.
To get a solid mounting you need to screw into a shoulder on the screw.
Cheers
TimSome days I turns thisaway, somedays I turns thataway and other days I don't give a stuff so I don't turn at all.
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26th March 2013, 11:35 AM #14Huey, one of my screw chucks has 25mm screw. Drill a 25mm hole with a forstner bit and on very low speed, mount the bowl to the chuck.
With all you fabrication experience, you'd be able to knock one up in a few minutes.
You might try one at 6 threads per inch / 4.5 metric pitch. Go in deep enough to leave just a bit of flat on top of the threads, then put the lathe in back gear and use a round file to get them deeper.
Tim the Timber Turner
Good luck trying to screw that into hard wood like dry Red Gum.
To get a solid mounting you need to screw into a shoulder on the screw.
Tim I'll be using the Teknatool system or idea where the job butts up against the chuck jaws. I also have a series of 3 mm stainless discs of various diameters that fit over the screw chuck to give a wider area of support.Inspiration exists, but it has to find you working. — Pablo Picasso
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26th March 2013, 12:18 PM #15GOLD MEMBER
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So much timber, so little time.
Paul
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