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bowl turning(washout)

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Forum topic by 3285jeff posted 01-22-2015 11:38 PM 1342 views 0 times favorited 22 replies Add to Favorites Watch
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3285jeff

152 posts in 1185 days


01-22-2015 11:38 PM

well I tought I was doing pretty good,,had the outside of my bowl turned down,,put a tendon on the end,,ordered me a chuck and tried to finish it and hollow out the inside and try to smooth up the outside,,,WRONG,,LOL,,couldn’t keep it in the chuck,,keep grabbing the wood when I applied the tools to it,,and coming off the chuck,,and hollowing it out was a no go from the word go,,kept coming out of the chuck,,i was using hard rock maple,,i don’t mean to sound like a complainer,,but I guess my spirits just got broken,,lol,,been making pens and so far they look really nice,,so I was hoping for a little better,,,maybe I should just throw in the towel and forget it,,lol,,,any comments would be helpful,,,thank you


22 replies so far

View Case101's profile

Case101

107 posts in 1260 days


#1 posted 01-23-2015 12:12 AM

Did you put an angle on the tendon for the check to hold on to?
Is the diameter of the tendon match your chuck? If the chuck is designed for lets say a tendon of 2-3 inches and you have 4” the actual part of the chuck that grabs is very small.

-- John, New Jersey

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LeeMills

273 posts in 769 days


#2 posted 01-23-2015 12:53 AM

It sounds like it may be more tool presentation rather than the chuck but the chuck is a good place to start.
Here is a link to some videos by Stuart Batty on Chuck and Jaws, Recesses, and Tenons (three different videos). The topic name may not be exact as I gave.
I believe you have a Nova G3, if so follow the instructions. You do not cut a dovetail on the tenon for the 50mm jaws.
I also suggest Stuart’s videos on stance (three more). It really is of fundamental importance whether spindles or bowls.
I assume you are using a bowl gouge and not a spindle roughing gouge?

The videos are about 12-15 minutes each.
http://vimeo.com/woodturning/videos/sort:alphabetical/format:thumbnail

Oh, and don’t throw in the towel. Wipe the sweat off with it and give it a new go.

-- We cannot solve our problems with the same thinking we used when we created them. Albert Einstein

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3285jeff

152 posts in 1185 days


#3 posted 01-23-2015 01:20 AM

no,,actually I ordered the penn state one from amazon,,i believe its the csc3000 tn plated,,and yes I did cut a tendon joint in it,,and to be honest,,im scared now to do anything on the lathe,,lol,,im not a quitter as a rule but again I don’t want to be smacked up side my head either,,,lol

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LeeMills

273 posts in 769 days


#4 posted 01-23-2015 02:10 AM

My mistake, I thought you had the G3. I am not real familiar with the PSI so form the tenon as the jaws require, some jaws are straight and some dovetail.
Did you use tailstock support? You can do most of the hollowing with a pull cut rather than a push cut and leave the tailstock in place for quite a while.
Others may have better ideas on the potential problem. As John said, it may just be too large a tenon for the jaws.
If you watch the videos it is extremely important to have a flat surface for the top of the jaws to seat against and the tenon should not bottom out inside the chuck jaws.

-- We cannot solve our problems with the same thinking we used when we created them. Albert Einstein

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3285jeff

152 posts in 1185 days


#5 posted 01-23-2015 02:46 AM

thank you,,i did not try the pulling it back on the end,,,,i was thinking about getting some tools,,all I have is a rougting gouge and skew,,and parting tool,,these are tools that came with a shopsmith

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crank49

3981 posts in 2438 days


#6 posted 01-23-2015 02:48 AM

A tendon is what attaches a muscle to a bone.

A tenon is an extended portion of a wood component used for attachment.

Just sayin.

-- Michael: Hillary has a long list of accomplishments, though most DAs would refer to them as felonies.

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3285jeff

152 posts in 1185 days


#7 posted 01-23-2015 02:54 AM

please excuse my ignorance at spelling some words on here,,,i never went to college or have any degree

View crank49's profile

crank49

3981 posts in 2438 days


#8 posted 01-23-2015 03:29 AM

Please, no excuse needed. I was just trying to help get the terminology correct.
There are a lot of terms to learn in wood working.

-- Michael: Hillary has a long list of accomplishments, though most DAs would refer to them as felonies.

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TheDane

4997 posts in 3131 days


#9 posted 01-23-2015 04:06 AM

... all I have is a rougting gouge and skew,,and parting tool,,these are tools that came with a shopsmith

Then you don’t have the right tools. You cannot use a roughing gouge on a bowl … it is dangerous. Same goes for the skew and parting tool.

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

View LeeMills's profile

LeeMills

273 posts in 769 days


#10 posted 01-23-2015 04:11 AM

Heck Jeff, although it had heard it (never saw it written) I thought a Morse Taper was a Morris Taper for years … must be my southern. :)
I posted on a UK forum years ago to see if there was any difference in a spigot and a tenon. Nope. Nova instructions do not have tenons, they have spigots.

The roughing gouge can be dangerous with a bowl. The tang is weak compared to a bowl gouge and the tip is usually almost straight instead of swept back making it easy to catch the corner.

Oh, I don’t think you can really make a pull cut with a spindle roughing gouge.

-- We cannot solve our problems with the same thinking we used when we created them. Albert Einstein

View MrUnix's profile

MrUnix

4247 posts in 1666 days


#11 posted 01-23-2015 04:18 AM

Got an old spare drill bit? If you do, watch this video on using one to hollow a bowl:

https://www.youtube.com/watch?v=gVvmCMp9cRQ

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

View Rick M's profile

Rick M

7935 posts in 1848 days


#12 posted 01-23-2015 07:30 AM

I used a parting tool on that last cup I made. Just drove that sucker right down to the bottom about 1/4” from the outside. I was pretty surprised at how well it worked and gave me a nice consistent wall thickness. Bowls are wider though and you’d be pushing at an angle against the chuck so maybe not a good idea.

-- http://thewoodknack.blogspot.com/

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3285jeff

152 posts in 1185 days


#13 posted 01-23-2015 12:13 PM

I really do thank you for all your comments,,its really got me depressed..im not a quitter and I don’t mind buying the right tools for the job,,,this is my only place that I can actually get educated on this,,the closest woodcraft store is about 70 miles away from me,,so classes are out,ut I reaaly do want to learn the proper way to do these things,,

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3285jeff

152 posts in 1185 days


#14 posted 01-23-2015 12:15 PM

can anyone tell me the tools I should buy that would help me,,

View Bmezz's profile

Bmezz

34 posts in 851 days


#15 posted 01-23-2015 12:43 PM

Can I suggest going to you tube. There are dozens of videos there that will be of great help. You must never use a spindle roughing gouge on a bowl! Very dangerous. You could also try using a mortise instead of a tenon on your next bowl. You may find that a bit stronger. There is a learning curve. Go slow and build your knowledge and experience. And by all means stay safe.
Cheers, Bob

-- Member Valley Woodturners Ottawa

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