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Thread: Surprise!
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1st March 2019, 10:01 PM #91
Reminds me of a couple of months ago when I was slabbing the butt of a large Jacaranda my neighbor had taken down (I've now got enough chair seats drying under the house to fit out a largish restaurant! ). It had all gone pretty well until the last length, which was from closest to ground level. I started with a sharp blade, which sailed through the first cut, as you'd expect with a soft wood like Jacaranda, but part way through the second cut, it slowed down to about the pace of the hour hand on a clock. I couldn't figure out what was going on but eventually ground my way to the end. It was getting dark by then, so I left it at that point & went home to sharpen the saw. In the clear light next morning, I could see a whole bunch of shiny spots, each about 2mm diameter, scattered all over the cut surface. Yep, some excressant person had driven a dozen 3-4" nails into the tree on that side, about 15 or 20 years back!
Hardware is always a worry with backyard trees, but I foolishly believed my neighbor when he assured me that noone had ever driven a nail or spike into that tree!
Cheers,IW
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1st March 2019 10:01 PM # ADSGoogle Adsense Advertisement
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2nd March 2019, 03:12 AM #92
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2nd March 2019, 08:31 AM #93
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2nd March 2019, 06:52 PM #94
True - I would probably have passed on the butt log, but it was such a good diameter, & neighbor assured me there'd be no hardware. Yeah, right.....
Touche, Paul. I swear I only hit the button once - perhaps it is a problem at grand central after all. If it happens this time, I'll stir up admin...
Cheers,IW
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2nd March 2019, 06:52 PM #95
True - I would probably have passed on the butt log, but it was such a good diameter, & neighbor assured me there'd be no hardware. Yeah, right.....
Touche, Paul. I swear I only hit the button once - perhaps it is a problem at grand central after all. If it happens this time, I'll stir up admin...
Cheers,IW
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2nd March 2019, 06:55 PM #96
Yep - it did. ......
I got a "Do you wish to leave page?" message when I hit 'post', maybe that's got something to do with it...
Cheers,IW
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2nd March 2019, 07:52 PM #97
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16th March 2019, 04:50 PM #98
I guess it all comes down to the definition of “about”? I finally got around to tuning my bandsaw today. I followed the Snodgrass method reasonably conscientiously and, although I didn’t find anything conspicuously wrong, the drift has gone and I’m able to resaw and cut veneers again?
F47CFC9D-F8C3-423F-B298-F210F3AAB3EE.jpg 6F707DD7-11AF-4C8E-9072-64550D8C9796.jpg
The brush on the bottom wheel wasn’t making contact and so there was some crud pressed in to the neoprene (?) tyre which I removed but that, other than readjusting the guides, was about all I found?
So, in the spirit of not looking a gift horse in the mouth, I am pleased, but.......a rock is an obsolete tool ......... until you don’t have a hammer!
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16th March 2019, 05:53 PM #99
Fletty, just cut the blessed veneers, whilst the bandsaw is behaving itself. Don't question it's vicarious behaviour.
Pat
Work is a necessary evil to be avoided. Mark Twain
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16th March 2019, 06:08 PM #100
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16th March 2019, 07:01 PM #101
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28th March 2019, 12:05 PM #102
Im finally back on to the project. The prototype curved piece gave me a lot of information but it also demonstrated that the formers weren’t parallel nor aligned while the glue set. Part of this was because the prototype was ‘only’ 35t x 50h whereas the formers were cut for a 40mm thickness.
So, today I cut a blank 50t x 60h, resawed it on the sawbench with a thin kerf blade to give me a stack of laminations 40t x 60h. I did not dress the laminations after resawing. I also fitted a batten to the bottom of the former, glued the laminations and clamped it while watching more carefully where the clamps applied the pressure.
The main things I am interested in checking are the evenness of clamping, the detriment, if any, in NOT dressing the individual laminations and, to make up the 40 mm thickness, one of the laminations was 8 mm thick. It bent very easily and may give me the time benefits of doing the final pieces with 5 x 8mm laminations rather than 8 x 5mm laminations?
Now the waiting begins.....
A5BA026D-F5B7-42B4-B017-68E15B3D2AC8.jpg EACEE6ED-F1F4-46BD-9E25-C43F126BA0EB.jpga rock is an obsolete tool ......... until you don’t have a hammer!
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28th March 2019, 02:41 PM #103SENIOR MEMBER
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When I watched Darren Oates' demonstration at Sturt, he used a solid convex (inner) mould and a piece of unglued identical timber plus a strip of spring steel (old bandsaw blade) for the concave outer side. I suspect this was to allow the necessary slippage to occur between the laminations as they were gradually bent into shape. I'll be interested to find out if using solid timber both sides will produce the same result. You might think about using a ratcheting tie down strap for the initial bend and then clamping the convex outer mould. I suspect you might run the risk of introducing unwanted stresses into the process.
Just a thought...
mick
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28th March 2019, 07:39 PM #104
Good point, Mick. On the few laminating projects I've tried, I very quickly found that the laminates needed to be quite even and the cauls made very accurately, or you won't get even pressure on the laminates and you'll get little gaps here & there between them. Unless you end up with a lot of large gaps, the cured lamination will be quite solid, and useable if the sides of the finished piece are not visible, but a bit unsightly if they will be seen!
As you point out, a strap is far & away the best way to get even pressure while the glue cures. The set-ups I've seen illustrated used spring steel straps, which means a whole lot of work making that sort of gear, but what about a couple of heavy-duty ratcheted tie-downs - could something like that supply enough force to bend your strips, Fletty??
Cheers,IW
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28th March 2019, 09:18 PM #105SENIOR MEMBER
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There are some pretty grunty tie downs around including those the truckies use. Even the ones available from auto stores are rated at a few hundred kilos. If the tension wasn't sufficient relying on the ratchet handles, I think a couple of well placed screw clamps would get you there.
mick
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