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Larry Barnowsky Inner circle Cooperstown, NY where bats are made from 4770 Posts |
I wonder if anyone has other techniques for making a short hollow wooden tube. Mine measures 2 1/2 x 1 inches with a 3/4 inch diameter hole. I used a drill press with 1 inch round dowel stock and 3/4 inch Forstner bit. I drill just past half way through and then reverse it and drill again until the bit passes through to the other side. The inside is filed smooth with a round rasp. Getting the center perfect is critical. I've seen videos of using a lathe after drilling the long hole in square stock and then spinning it until it is round. It's used in a trick I made called Penny Candy.
http://www.barnowskymagic.com/Pennycandy.html |
lnlver New user 71 Posts |
Hollow tubes of any length can be made by taking two identical pieces of wood, with the height being half of the width. When these are glued together, the cross-section is a square. Before gluing, though, use a cove bit to rout a channel the entire length of both pieces along the center axis of the wider dimension. (A cove bit cuts a semi-circular portion out of the piece.)
After matching the sides up, you get a circular hole in the center. Glue and clamp the pieces together and it will be ready for turning on a lathe. You'll have to make jigs to position the piece on the lathe. |
Dan C New user 100 Posts |
If you have a metal lathe available I would do the whole thing on there. Use stock about 3.5" long chuck it in then turn the outside to perfectly round at this point insert the forstner like a boring bar into the end after you center it on the cylinder. Take it our of the lathe and use a band or table saw to take off the excess length.
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lnlver New user 71 Posts |
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Dan Ford Special user Illinois 753 Posts |
Some of the older roller blinds for windows are made of wood and the end where the spring is is hollowed out for the spring. It is about 6 inches long.
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Russo Inner circle So.California / Centl.Florida / retired Florida 1165 Posts |
Just wanted to share- a while back I built an Adult Hippity Hops- using the shape patern - had a friend draw for me a cute "Playboy Bunny" (clean, if you know what I mean- just cute, with ears & full bathing suit) One, was a Blond the other was a Red Head - both with different color Bathing Suits - -for the final turn around - instead of differnt colors = there was the "back Side" with a furry tail-cut out of a short fur type matrl. Fun. I'm usually not in this forum - if any comments - please p/m me.
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Bill Hegbli Eternal Order Fort Wayne, Indiana 22797 Posts |
I have had very good luck with just normal speed bore bit. It goes through the wood like butter.
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Larry Barnowsky Inner circle Cooperstown, NY where bats are made from 4770 Posts |
Quote:
On May 11, 2017, lnlver wrote: That's a good idea. But, I wanted it to be seamless. |
gimpy2 Special user 960 Posts |
Quote:
On May 11, 2017, Larry Barnowsky wrote: I think you could make the seam vanish by starting with thicker stock and re-sawing then mate after shaping the parts.
Gimpy
www.gimpysmagic.com |
lnlver New user 71 Posts |
It is possible to hide the seam really well; this will depend on the type of wood you're using. For example, oak or any other open-grain type wood is a bad choice. But walnut, cherry, maple or any closed-grain woods are good types of material to use.
You have to make sure your cuts are precise and clean. By precise, I mean that they are made at 90 degrees; by clean, I mean that there aren't any saw burns on the wood. Apply a thin layer of glue on the edges and clamp the pieces together. Remove any excess glue with a damp cloth immediately; this eliminates blotches if the piece is to be stained or poly'd. Then sand the area with fine sandpaper (400 grit) and the seam should be virtually invisible. |
George Ledo Magic Café Columnist SF Bay Area 3042 Posts |
A fairly simple way might be to start with a "square" block, a bit longer than the tube needs to be, and drill the hole right through it. Then insert a dowel the same diameter as the hole (but a bit longer) and glue it on both ends. Then chuck the dowel in place. Turn the tube, cut off the excess, and there you are.
This is basically the same way pens are turned. You start with a hole through the blank, then insert a mandrel to hold the blank in the lathe, and then turn it. There's lots of info online on the process.
That's our departed buddy Burt, aka The Great Burtini, doing his famous Cups and Mice routine
www.georgefledo.net Latest column: "Sorry about the photos in my posts here" |
Michael Baker Eternal Order Near a river in the Midwest 11172 Posts |
Quote:
On May 12, 2017, George Ledo wrote: Yep... or just use a jaw chuck on a square blank, bore out the hole using a Forstner bit in the tail stock Jacobs chuck, then turn the cylinder, without ever having to remove it. Actually, I'd turn the cylinder partially down to get past the rattle stage of turning, then bore the hole, and then finish bringing the cylinder down. Cut off the excess. FYI - Holding that dowel with your hands and drilling the bore is muy dangerous, especially when the cylinder walls are that thin. That photo made me cringe.
~michael baker
The Magic Company |
Larry Barnowsky Inner circle Cooperstown, NY where bats are made from 4770 Posts |
Thanks Michael for the tip. The pic was taken while I was centering the bit. The dowel was hammered into a 1 inch hole in a clamped board which kept the dowel solidly in place. Used an extra clamp (not shown) to keep the dowel from wobbling. No fingers were in danger.
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Michael Baker Eternal Order Near a river in the Midwest 11172 Posts |
Quote:
On May 12, 2017, Larry Barnowsky wrote: Yeah, I figured you would have known this Larry. The info is still there for the uninitiated.
~michael baker
The Magic Company |
TheRaven Special user 597 Posts |
Not only is centering critical but keeping the dowel at 90 deg to the table in all directions is too. An L-shaped jig with the vertical riser having a v-shaped notch for the dowel to rest in could be clamped to the table and then the dowel clamped to the jig. The jig would not need to move when you flipped the dowel and the v-notch would ensure precise positioning in all dimensions. Another option to keep things centered is to first drill all the way thru with a much smaller twist bit.
EDIT: Seeing your link Larry, the jig I described would be good for producing multiples as once aligned the jig stays put and the dowel self centers. |
TheRaven Special user 597 Posts |
Here are a couple ideas in a pdf drawing... the one above an another more specific jig.
https://drive.google.com/file/d/0B32KojK......=sharing Karl |
Larry Barnowsky Inner circle Cooperstown, NY where bats are made from 4770 Posts |
Thanks so much Karl for the info.
Larry |
MentalistCreationLab Inner circle 1528 Posts |
We have a version of this vice in the shop which works well
https://www.oliverswoodturning.co.uk/pro......ntreing/ also three is this home made version http://lumberjocks.com/projects/144906 once set the vice will auto center what you're drilling. Easy to set just clamp the bit (in the chuck) in the vice and clamp vice to table. Then everything is repeatable quickly. |
jay leslie V.I.P. Southern California 9498 Posts |
First you put a morse taper on the end of your stock or calm it into a square chuck. Remove the chuck, if you go that route. either way, bore-out the interior then shape the exterior then carefully cut the tube off the excess end.
It’s just like spinning a bowl on a lathe.
Jay Leslie
www.TheHouseOfEnchantment.com |
GS121002 Veteran user but he still can't help build a border wall with only 313 Posts |
Larry, when I first looked at your picture, I said, "Oh, it looks like he is making a duck call" because it would be very similar construction and the tools to build it, would be the same.
I turn all kinds of game calls on my wood lathe and found that you also need a mandrel such as this: WoodMaster Game Call Mandrels. Once you have these tools, you could start to make your tubes a little fancier or even out of acrylic. The normal process for building is to start with a square piece of wood, find center on the end, drill your 3/4" hole all the way through, then mount it on the mandrel, turn, then sand and finish. Here is one in process that I made.... Hope this helps you.
Gary Salisbury
San Diego, CA It's a fact! - Any sufficiently advanced technology is indistinguishable from magic. (This line censored by Dave Scribner because it is in Latin) - What you believe is real, is real! Who was that masked man and what is he all about? - https://www.pinterest.com/garydsalisbury/ |
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