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Thread: Skew's box(es?)
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5th August 2009, 12:54 AM #16
....hmmmm, interesting concept, Skew, looking forward to seeing the end result.
Cheers,
Ed
Do something that is stupid and fun today, then run like hell !!!
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5th August 2009, 09:28 AM #17
Looking good Skew!!
I really like your blow by blow naration and photos. I find it really helpful to understand your process and it also helps to understand some of the terminology used.
Can't wait to see the end result
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5th August 2009, 11:41 AM #18Senior Member
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Nice work skew ; eagerly awaiting for the end result; good looking bit of timber you have there. That polish suits it well.
Cheers, Evan
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5th August 2009, 03:24 PM #19
Looking awesome so far Skew!
I like the troubleshooting you are doing along the way. I'm forever getting the steps out of order then having to come up with some nifty way of remounting stuff. The donut chuck idea is great TL!
Eagerly awaiting more progress!
Cheers,
Dave...but together with the coffee civility flowed back into him
Patrick O'Brian, Treason's Harbour
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5th August 2009, 06:14 PM #20
Only got half an hour in this arvo. Made a couple of stupid blunders early on, which have convinced me I'm it's not a good idea to carry on turning this evening.
I removed the first jam-chuck from the faceplate & made a new one, with an 8" piece of ply as the backing plate, for when I build the jam chuck. (I'll post pix when I get around to building it, which should be next post.)
Took my measurements, checked the new jam chuck for fit, all good.
I found my spring calipers (buried under an inch of shavings) and decided to throw the first piece back on and ensure the wing was a constant thickness. It only took a poofteenth of, then I dismounted it to check my handiwork.
SHOCK! HORROR! There's burn marks inside the bowl from where the jam-chuck wasn't quite right!
Attachment 112832
OK, OK... hopefully it's not as bad as it looks, mainly charred finish and it'll hand sand out. But what a PITA! Alright, just so's it doesn't happen to the second half when I hollow it, I take a bit more off the jam chuck and triple check it for fit. Be-ew-diful fit!
Put the first piece aside, mount the second and start hollowing the back. La-di-dum, la-di-dee. Job done easily & quickly. Yay! Except for the actual "sphere bit" in the middle, but that's what the doughnut chuck will be for.
Dismount, have a look...
I belatedly realised just why the jam-chuck had been "too tall" for that first piece! I'd turned it for this second one, which has the added Huon lip, right? So it's a bit deeper, yes? And then turned the other piece first!
Of course, 'cos I shaved that bit off so that the first one fitted, that meant that the second piece wasn't properly supported... all the pressure of the tailstock was being taken by the Huon lip. It has compressed as flat as a pancake.
Worse, the heat generated caused the glue to soften and the whole piece has started to lift.
Attachment 112833
Now, if I'd turned this piece first and then shaved the jam chuck down to turn the piece I turned first second, I wouldn't have either problem.
It's just pure stupidity that I did it in the order I did... I've had a long, mind-numbi9ng day at work and, sadly, the ol' brain-cells didn't fire up until too late.
Tomorrow I'll turn away the Huon - which is why I've left the spigot still on - and make a replacement. And yet another jam-chuck. But no more today... I've no wish to put "third time lucky" to the test.
- Andy Mc
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5th August 2009, 06:24 PM #21
Just wasn't the day for it I guess. Al I did today was mucking about to. Nothing to show.
anne-maria.
Tea Lady
(White with none)
Follow my little workshop/gallery on facebook. things of clay and wood.
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5th August 2009, 06:37 PM #22
Thanks for the kind words, people.
Yep. Exactly my reasoning.
As I understand it, the whole point of this box challenge is to share the ideas & problems behind our pieces. What better way than a warts 'n all WIP?
Hopefully this WIP will allow others to turn similar boxes for themselves, providing an idea of the basic steps and some of the possible problems along the way. (Oh yeah! The problems! )
I really should have planned it better, but them's the breaks. It's what happens when your design decisions are made with a chisel in your hand instead of a pencil.
I haven't covered which tools were used where, because that's irrelevant. You can use whatever tools you feel most comfortable with at each stage.
But just to include the info; for the bulk hollowing I've used an Oland tool, my new Thompson 3/8" detail- and bowl-gouges (still unhandled ) for shaping and, for the really, really hard to reach places, I've been using a big ol' screwdriver ground to a severe LH rounded scraper profile.
The screwdriver is actually making nice finishing cuts!
- Andy Mc
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6th August 2009, 10:02 AM #23Retired
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Andy, you've gone to a lot of trouble to put your WIP into photos and words. I've learnt a lot already.
So, my thanks from all the learners like me out there.
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6th August 2009, 12:08 PM #24
go have a couple of cold one's...kick a cat or two, things will be better in the mornin'
Cheers,
Ed
Do something that is stupid and fun today, then run like hell !!!
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6th August 2009, 03:56 PM #25
Gday all, interesting thread, Andy, enjoying your narrative & pics. Problem solving skills too.
Cheers.................Sean
The beatings will continue until morale improves.
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6th August 2009, 04:00 PM #26
You're back in from the cold again.
I'm, reading and trying to learn Skew. Reataining it, well that's another question.
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8th August 2009, 08:09 PM #27
Again, I only managed to snaffle a couple of hours in the shed for today. Still, I managed to build the doughnut chuck and "properly" turn the parts that were causing me so much grief on the jam chuck.
OK, here you can see just how much thinner I wanted to make them: it' around 6mm! I'm so glad I didn't decide "Buggrit, that'll do..."
Attachment 113125
You may notice that I left a rough edge on the inside of the chuck ring. I really should've sanded that smooth, 'cos only moments from finishing for the day, while applying EEE, I sliced the hell outta my RH pinky on it.
So, turned down to size & then a finish applied:
Attachment 113126Attachment 113127
... then repeated for the other half and, besides taking them out of the chuck, that was it for the day! Tomorrow I'll fix up the inside of the lid (those char marks) add the new lip ring to the box and, hopefully, finish it completely.
---=<(*)>=---
Just for those who aren't sure what a Doughnut Chuck is and can't really work out the details from the above pics:
Attachment 113128
The scrap piece of ply wedged in between the faceplate piece & the mouth of the box is there purely so that the ends of the screws don't project out the back of the faceplate so far. I've a habit of grabbing the drive-shaft just behind the faceplate to help brake the work when I switch the lathe off... and with those sharp, pointy bits spinning around out of sight there'd be a chance of slashing my wrist if they were any longer than they are!
(As you can see from the pic, there's still a bit protruding; if I had more time I'd have mucked around cutting the screws to the right length. But I'm short on time, so... )
---=<(*)>=---
One problem some people have with a Doughnut Chuck is centering the work in it properly.
It's really a simple enough job, I do it exactly the same way I check for centre when remounting a piece in the chuck.
First, I mount the piece fairly snugly, but not over-tight. Then I bring the toolrest into position, pick a reference point on the blank that I want centered, then lay a hex key on the tool-rest, close to the reference point.
Attachment 113129
I slowly turn the piece around by hand until the gap is at it's widest at the hex-key. Then I nudge the piece over (I just whack it with the palm of my hand) until the gap is only half it's size. I keep repeating this process, until the gap is the same all the way around.
Attachment 113130
Then the chuck/whatever is snugged up tight, I double-check the centre (with the hex-key again) and then away we go!
- Andy Mc
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8th August 2009, 08:14 PM #28
non of the piccies work! I wanna see the picciesssss!!!!!!!!!!!!!!
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8th August 2009, 08:17 PM #29
'Twas a forum problem... for some reason, after posting 'em and letting me attach 'em to the post, it went ahead and deleted 'em!
- Andy Mc
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8th August 2009, 08:22 PM #30
I can't envision the end result!
But the steps are amazing.
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