Thanks Thanks:  0
Likes Likes:  0
Needs Pictures Needs Pictures:  0
Picture(s) thanks Picture(s) thanks:  0
Results 1 to 10 of 10
  1. #1
    Join Date
    Aug 2005
    Location
    Cranbourne West
    Age
    68
    Posts
    3,528

    Default A bit of practice

    I've been practicing turning thin walls lately with various degrees of success. My main problem seems to be bad approach angle resulting in a thin lip as shown on the natural edge silky oak bowl and small goblet. I got the approach better on the cyprus bowl but the damn thing shattered . Managed to get some translucence though .

    The cyprus was only cut down 8 weeks ago and was sopping wet, fun to turn though. I managed to get a consistent wall thickness before the "mishap" and was happy with the way things were proceeding. I put a few drops of CA on the pieces just to put it back together to show the shape. Looking at the photos I now realise that I probably should have got rid of the pith and that's probably what caused the blowout.

    Attachment 148063 Attachment 148064 Attachment 148065 Attachment 148066 Attachment 148067 Attachment 148068

    The silky was also green but not as wet as the cyprus, still needs some sanding and work done to finish the foot off.

    Attachment 148069 Attachment 148070 Attachment 148071

    The goblet bowl is weeping cherry and bone dry. The bottom 2/3rds. is not bad, but the top is terrible due to bad approach angle and lousy sanding techniques, nowhere near thin enough either. It never would have made it to a finished goblet as the centre was rotten and I had no chance of turning a thin stem.

    Attachment 148072 Attachment 148073
    Last edited by Grumpy John; 21st Sep 2010 at 04:16 PM. Reason: Typo
    To grow old is inevitable.... To grow up is optional

    Confidence, the feeling you have before you fully understand the situation.

    What could possibly go wrong.

  2. # ADS
    Google Adsense Advertisement
    Join Date
    Always
    Location
    Advertising world
    Age
    2010
    Posts
    Many





     
  3. #2
    Join Date
    Sep 2004
    Location
    Melbourne
    Age
    83
    Posts
    1,327

    Default

    Bugger. That would make anyone grumpy. How spectacular was the failure - bits flying all over or do you get a bit of notice of the impending failure so that you can duck/turn off power.
    I've just become an optimist . Iv'e made a 25 year plan -oopps I've had a few birthdays - better make that a 20 year plan

  4. #3
    Join Date
    Apr 2005
    Location
    Nerang Queensland
    Age
    62
    Posts
    10,621

    Default

    All good practice though John

    With the thin walled stuff I finish from the outer edge and work my way in a bit at a time finishing as I go. Looks like you tried to go back to the outside edge and the flex in the thin wall has caused the failure.
    Neil
    ____________________________________________
    Every day presents an opportunity to learn something new

  5. #4
    Join Date
    May 2010
    Location
    Cookeville, TN, USA
    Posts
    57

    Default

    You may be pushing on the bevel too hard. That causes the wood to flex or makes it bounce of the summer,winter wood which causes vibration. The vibration will cause the tool to grab the wood and then you get a catch. Try to see how light you can be on the bevel. Try putting more pressure down on the tool rest with your left hand and then be really light with the cut.
    another technique I've been playing with is using the bowl gouge with the flute up at 12 oclock. Rotate the tool to about 12:30 so it's not cutting and then very carefull rotate it up until it starts to cut. As you feed the tool down the bowl you may have to rotate the flute more towards 12:30. Just concentrate on keeping that side bevel flat against the bowl.
    When I'm cutting with the flute at about 1:30 or 2 I'm pushing the tool more into the wood. This causes the vibration I think because the tool shaft is about 45 degrees or so in orientation to the wood. With the flute up the shaft is closer to parallel to the wood so you aren't pushing against the side as much and you get less vibration and chatter.

  6. #5
    Join Date
    Aug 2010
    Location
    Baldivis WA
    Age
    36
    Posts
    2,763

    Default

    Hey Grumpy John

    That cypress bowl that would of been a nice peice to what a pain in the bum that it shattered on you but even put back together it still look awsome . The sliky bowl fantastic love it well done

    Cheers Nai84

  7. #6
    Join Date
    Aug 2005
    Location
    Cranbourne West
    Age
    68
    Posts
    3,528

    Default

    Quote Originally Posted by Peter36 View Post
    Bugger. That would make anyone grumpy. How spectacular was the failure - bits flying all over or do you get a bit of notice of the impending failure so that you can duck/turn off power.
    Pretty spekky, bits going everywhere, one piece landed behind the bandsaw. No warning whatsoever, the scary part was that I had my left hand rubbing the outside of the bowl to cut down vibration.
    To grow old is inevitable.... To grow up is optional

    Confidence, the feeling you have before you fully understand the situation.

    What could possibly go wrong.

  8. #7
    Join Date
    Nov 2007
    Location
    Dundowran Beach
    Age
    72
    Posts
    19,922

    Smile

    Well GJ, at least you have the nerve to have a go!

    I am not yet so brave!

  9. #8
    Join Date
    Mar 2007
    Location
    Munruben, Qld
    Age
    79
    Posts
    10,028

    Default

    Great effort and a learning curve for you. I haven't tried doing any thin stuff yet. .
    Reality is no background music.
    Cheers John

  10. #9
    Join Date
    Dec 2005
    Location
    Emerald, QLD
    Posts
    4,236

    Default

    Quote Originally Posted by Grumpy John View Post
    I've been practicing turning thin walls lately with various degrees of success. ........ I got the approach better on the cyprus bowl but the damn thing shattered . ..................................
    I don't know which cypress you were using GJ but I reckon you couldn't have picked a worse timber for practising thin walls. First one I turned from cypress (native White Cypress) sounded like a bowl full of rice bubbles each time I stopped the lathe
    .
    Updated 11th August 2019

  11. #10
    Join Date
    Jan 2002
    Location
    Melbourne, Aus.
    Age
    67
    Posts
    12,661

    Default

    Nice to see you pushing the boundaries GJ

    You could also try a small gouge; reduces outward pressure on the rim.
    Cheers, Ern

Similar Threads

  1. OT practice
    By wheelinround in forum WOODTURNING - ORNAMENTAL TURNING
    Replies: 11
    Last Post: 10th Nov 2010, 08:33 AM
  2. A bit of practice
    By orraloon in forum WOODWORK - GENERAL
    Replies: 10
    Last Post: 24th Aug 2009, 07:08 AM
  3. enough practice for now
    By ElizaLeahy in forum WOODTURNING - GENERAL
    Replies: 29
    Last Post: 27th Jul 2009, 11:33 AM
  4. Spindle practice
    By BernieP in forum WOODTURNING - GENERAL
    Replies: 6
    Last Post: 14th Feb 2007, 06:54 PM
  5. Box Practice
    By gazaly in forum WOODWORK PICS
    Replies: 13
    Last Post: 27th Oct 2005, 07:21 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •