I have a oneway talon chuck with jumbo jaws that I use to turn the tenon off and to finish the bottom of my bowls it is good to about 11 inches the bowl I am currently turning is just over 13 even the stronghold and mega jaws takes it to about 15 inches. Since the new lathe my bowls are getting bigger. any suggestions on how to reverse mount larger bowls
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oneway Talon with Jumbo Jaws
- Thread starter Sean Boyle
- Start date
jam chucks?
vacuum chucks?
I'll be following with great interest!
vacuum chucks?
I'll be following with great interest!
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A very inexpensive and effective solution is to mount a plywood disk on a faceplate, true up the edge, turn a shallow groove that matches the size of the bowl rim, and then use light tailstock pressure to hold it in place. You can also use thin rubber drawer liner to cushion the rim if you are concerned about scuffing it.
Shawn also has a couple good suggestions. There are a multitude of other ways and I would put Jumbo Jaws, Mega Jaws, Cole Jaws, and others of that sort at the bottom of my list.
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john lucas
AAW Forum Expert
Go to our club website and read my article on methods and jigs to reverse turn bowls. You may find a solution.
http://www.cumberlandwoodturners.com/htm/tips.htm
http://www.cumberlandwoodturners.com/htm/tips.htm
great article John, thanks for sharing!
Sean.......
The Oneway Jumbo and Mega-Jumbo jaws are an excellent method of reverse mounting bowls. I do this with nearly every bowl I make, and have become proficient at it.......there is a learning curve, however. Your permanent solution is to break down and get a Oneway Stronghold chuck. With the Stronghold chuck, it increases your possibilities, and you can use the larger jaw sets available for it.
I'd have to go check my notes out in the shop, but I believe the Mega-Jumbo jaws have a practical limit of around 14" in the contraction mode, and about 15 1/2" in the expansion mode for turning the foot on larger bowls. (Don't take those dimensions as absolute, as I'm going from memory, but it's close for a 16" swing. Depending on what lathe you're using, you might find the limits to differ......)
I don't know how big you can turn on your lathe, but there are flat plain jaws available for the Stronghold chuck, as well. With these jaws, you can make extensions which would increase your possibilities to nearly any size you want......unlimited, up to the limitations of your lathe swing.
Here is a pic of the Mega-Jumbo jaws. I have both the Mega-Jumbo jaws, and the regular Jumbo Jaws.......plus the plain flat jaws.......I'm covered, no matter what the circumstances, and the only limit is my 16" swing Australian Woodfast lathe. The Grenadillo bowl shown in the picture would normally be done on the smaller Jumbo jaws, but at that time, I only had the Mega Jumbo jaws. Although the Mega-Jumbo jaws eclipse the limits of what the Jumbo jaws can handle, the smaller set is just a lot handier for turning the smaller bowls.
ooc
The Oneway Jumbo and Mega-Jumbo jaws are an excellent method of reverse mounting bowls. I do this with nearly every bowl I make, and have become proficient at it.......there is a learning curve, however. Your permanent solution is to break down and get a Oneway Stronghold chuck. With the Stronghold chuck, it increases your possibilities, and you can use the larger jaw sets available for it.
I'd have to go check my notes out in the shop, but I believe the Mega-Jumbo jaws have a practical limit of around 14" in the contraction mode, and about 15 1/2" in the expansion mode for turning the foot on larger bowls. (Don't take those dimensions as absolute, as I'm going from memory, but it's close for a 16" swing. Depending on what lathe you're using, you might find the limits to differ......)
I don't know how big you can turn on your lathe, but there are flat plain jaws available for the Stronghold chuck, as well. With these jaws, you can make extensions which would increase your possibilities to nearly any size you want......unlimited, up to the limitations of your lathe swing.
Here is a pic of the Mega-Jumbo jaws. I have both the Mega-Jumbo jaws, and the regular Jumbo Jaws.......plus the plain flat jaws.......I'm covered, no matter what the circumstances, and the only limit is my 16" swing Australian Woodfast lathe. The Grenadillo bowl shown in the picture would normally be done on the smaller Jumbo jaws, but at that time, I only had the Mega Jumbo jaws. Although the Mega-Jumbo jaws eclipse the limits of what the Jumbo jaws can handle, the smaller set is just a lot handier for turning the smaller bowls.
ooc
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I have cole jaws/jumbo jaws. I rarely use them. I have a roll of double sided turners tape, that works well at times though it is sticky frustrating stuff. I mostly use a plywood disk on a faceplate and hot glue. I've used it for work from 1" to 20" and the only failures were mine. It is cheap, available everywhere and cheap.
Jon thank you for the link excellent read and thank you everyone for your Ideas. My lathe has a 20 inch swing over the bed and as I am turning larger bowls on a more consistent basis Odie I am taking you advice Strong hold and mega jumbo jaws are on order. As my turning progress and I go beyond the limits of the mega jaws I will definitely incorporate some of the ideas here
Great! 😀
My three Stronghold chucks have become irreplaceable components in my turning style, and I'm sure that many turners find that their possibilities are compounded beyond their original expectations.....after using the Jumbo Jaws for awhile.😀
If you aren't already aware, the rubber buttons are stackable. Not only that, but when combined with thin washers, you can adjust the contact point, with precision, to any height you require. Since it is possible to do this height adjustment with precision......it opens up the doors to further expand the boundaries of your personal creativity in bowl design.......:cool2:
ooc
Jack Straka, A woodturner from Hawaii created the Straka chuck. Here is the link.
http://woodturninglearn.net/articles/StrakaChuck.pdf
http://woodturninglearn.net/articles/StrakaChuck.pdf
Using the MJ jaws themselves as a base for the extensions is one great idea, Paul.......:cool2:
I'll stash that information into the back of my mind.
On initial thought, the Mega Jumbo jaws ought to afford you some additional stability over the plain flat jaws. The reason I think that, is because the Mega Jumbo jaws secure the extensions at a larger radius than the plain flat jaws would. I would think the Rock Maple extensions ought to work about as good as the aluminum ones would........? Tell us what your reasoning was for changing over.
Thanks for taking the time to post a photo......it always helps to make descriptions a lot more comprehendible to the reader.
ooc
Thanks for this link, captjim.......
The Straka chuck is very similar to the Grumbine chuck, of which I use sparingly for those times I do natural edge bowls and others that don't have a flat rim. For those who specialize in natural edge bowls, I assume the vacuum chuck is the best way to go....... I don't have a vacuum chuck, so just sayin!
This Straka chuck, and the Longworth chuck are other options some turners are going to find very applicable to their own styles of turning. For myself, the Stronghold/Mega Jumbo Jaws are my go-to method.
Here is my Grumbine chuck. Photo was taken during construction, and I now have various lengths of bolts to make a proper fit without all that dangerous overhang. The rubber ball compresses into the interior bottom of the bowl, against a piece of leather. The neck has a leather covering to make contact with the exterior of the bowl. I've found that leather works to not mar the finish sanded surface a little better than rubber/plastic hose does. The Grumbine chuck is mounted to an 8" faceplate.
ooc
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Hey Odie
I made the aluminum extensions because I could drill and tap screw holes for the rubber buttons. In the maple ones I used wood screws. Having said that, the maple ones worked fine. I think there is the - I like to mess around making things - factor, and this was a challenge.
I made the aluminum extensions because I could drill and tap screw holes for the rubber buttons. In the maple ones I used wood screws. Having said that, the maple ones worked fine. I think there is the - I like to mess around making things - factor, and this was a challenge.
Paul......looks like the challenge was also an improvement! 😉
I do the same all the time, too! Just because the original invention worked pretty good, doesn't mean the second effort isn't worth doing it all over again! .....😀
Second, third, fourth efforts?.......it's all about results! Great results are ALWAYS better than good results.......right?
ooc