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Oops - bowl too big for Cole Jaws

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Forum topic by socrbent posted 09-08-2017 01:20 PM 609 views 0 times favorited 11 replies Add to Favorites Watch
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socrbent

510 posts in 2051 days


09-08-2017 01:20 PM

Topic tags/keywords: question lathe

I am looking for suggestions. The bowl I have made is too big in diameter to reverse and mount on my cole jaws to remove the waste block and finish the bowl bottom. The segmented bowl of maple and mostly walnut has a inner diameter of 10 1/4” and a height of 8 1/4”. I have a piece of mdf that was used to help as each ring was mounted (third photo). Any ideas?


-- socrbent Ohio


11 replies so far

View Wildwood's profile

Wildwood

2149 posts in 1916 days


#1 posted 09-08-2017 02:40 PM

Would make a jam chuck with two pices of MDF or plywood glued togther with turned taper. Using old carpet or carpet foam mat to cover tapered MDF so could reverse turn with just enough tailstock support to turn away most of that waste block. Would cut or sand away remaining waste block.

Of course assume you have a center hole in the waste block already otherwise will have to play with so bowl runs true for turning

Good luck with it.

-- Bill

View Kazooman's profile

Kazooman

843 posts in 1734 days


#2 posted 09-08-2017 02:41 PM

Beautiful bowl!

Quit thinking “lathe” and start thinking “router”. A piece of MDF with a hole in it attached to the bottom with double sided tape will support your router while you remove the waste block.

View Nubsnstubs's profile

Nubsnstubs

1181 posts in 1512 days


#3 posted 09-08-2017 03:08 PM

The MDF you already have would be sufficient. True it up, cut a step on the edge that fits the inside rim diameter, bring up your tailstock and remove all but the proverbial nub. Knock it off, sand the bottom, and complete the finish….

If you haven’t already done it, check out my website and see what I have for removing tenons. It beats any of the current holding tools on the market as it has no size restrictions, and the workpiece is safely held between centers while removing tenons….......... Jerry (in Tucson)

-- Jerry (in Tucson) www.woodturnerstools.com

View socrbent's profile

socrbent

510 posts in 2051 days


#4 posted 09-08-2017 05:36 PM

Thanks guys for the responses. The router idea looks promising since I already have an outer rim true and finished. I’ll post again when progress is made.

-- socrbent Ohio

View TheDane's profile

TheDane

5299 posts in 3445 days


#5 posted 09-08-2017 09:56 PM

The router idea looks promising …

No offense intended to anyone, but a router would be the last thing I would consider. Jerry’s suggestion to use the piece of MDf you have as a jam chuck is (IMHO) be far the best and easiest option.

-- Gerry -- "I don't plan to ever really grow up ... I'm just going to learn how to act in public!"

View MrUnix's profile

MrUnix

5805 posts in 1980 days


#6 posted 09-09-2017 04:30 AM

I don’t have any cole jaws or a longworth chuck and have never had a problem, or even thought about getting one… jam chucks work great and can be made for free.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

View socrbent's profile

socrbent

510 posts in 2051 days


#7 posted 09-12-2017 10:11 PM

Resolution – A sharp wood chisel and some time. After due consideration I simply placed the bowl upside down on a doubled up t-shirt on my bench and slowly removed the tenon. Used no hammer – just handle carving. It took several hours and was reassuring that at no time did I risk damage to the bowl. Completed with a scrapper, RAS and manual sanding to 320 then applied walnut oil. On Thursday I plan to use the Beal system to buff and wax the bowl. Thanks for your suggestions guys. Here are a few photos of the process:



-- socrbent Ohio

View waho6o9's profile

waho6o9

7981 posts in 2358 days


#8 posted 09-12-2017 10:46 PM

Beautiful work!

View hairy's profile

hairy

2549 posts in 3314 days


#9 posted 09-13-2017 01:43 AM

Maybe a paper joint would be the way to put on the waste block?

-- stay thirsty my friends...

View socrbent's profile

socrbent

510 posts in 2051 days


#10 posted 09-13-2017 01:48 AM

Having no experience with paper joints, would that be strong enough for a turning of this size that was turned without tailstock support?

-- socrbent Ohio

View TheDane's profile

TheDane

5299 posts in 3445 days


#11 posted 09-13-2017 02:30 AM

FWIW … I wouldn’t trust a paper joint on a piece that big. Might be okay, but a small catch could (IMHO) be costly.

-- Gerry -- "I don't plan to ever really grow up ... I'm just going to learn how to act in public!"

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