Results 1 to 10 of 10
  1. #1
    Join Date
    Oct 2013
    Location
    Perth, Australia
    Posts
    1,813

    Default Panel warped after glue up - need tips for round 2

    So I'm building my saw till out of some red oak but think I did my clamps too tight a created a bow in the panel. It wasn't too bad on the first night but over the last couple of days it got significantly worse so I decided to start over.



    I've ripped it back into boards along the original glue lines and the boards are laying flat again so going to have another crack at it. Will need to rip the boards down a little further to remove the biscuits but luckily built the panel oversized so not a problem.

    Any suggestions for avoiding this or setup tips for the clamps? My bench is flat and I used parallel clamps but the boards are only 15mm thick so the parallel clamps don't have a lot of mating area with the edge of the panel. I had the bars of the clamps below the panel as shown in the photo.

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





     
  3. #2
    Join Date
    Dec 2003
    Location
    lower eyre peninsular
    Age
    74
    Posts
    3,577

    Default

    think I know the answer but to save embarrassing myself when proved wrong I'll defer my answer, but it has 2 parts ...thickness of timber and position of your clamps... lets see what the experts say
    I would love to grow my own food, but I can not find bacon seeds

  4. #3
    Join Date
    Dec 2010
    Location
    Mornington Peninsula
    Posts
    2,741

    Default

    This is where Frontline Clamps come in handy.

  5. #4
    Join Date
    Apr 2016
    Location
    Mooroopna, Victoria, Australia
    Age
    33
    Posts
    228

    Default

    Alternate your clamps top and bottom and clamp straight pieces of timber across to hold the boards flat during glue up.

  6. #5
    Join Date
    Mar 2008
    Location
    Hobart, Tas
    Posts
    1,211

    Default Panel warped after glue up - need tips for round 2

    Bueller, this has bitten me in the past too, where I clamped too tightly and ended up with a bowed board.

    If you have jointed the boards straight, such that they form a flat gap free panel when laid together dry, you could try this technique which has served me well. Spread the glue, then rub the two pieces together to get a consistent thin layer of glue with the excess pushed out. Then clamp with just enough pressure to hold them in place. It’s really just a rub joint with the extra security of clamps.

    I have used this technique successfully with stock from 18 mm down to about 5 mm.

    Having said that, I am keen to see what advice the experts will offer you, and will be watching this thread expectantly.

  7. #6
    Join Date
    May 2007
    Location
    Sth Gippsland Vic
    Posts
    4,355

    Default

    Alternate the heart side up down up across the three . And pay attention to weather . A warm dry day after glue up will send a panel one way And a wet day after will send it the other . Specially if only one side is exposed like if it’s left lying flat in a table top . Sandwich it between two sheets of wood and it’s safe from that .

  8. #7
    Join Date
    Dec 2003
    Location
    lower eyre peninsular
    Age
    74
    Posts
    3,577

    Default

    my 2 bobs worth...
    with timber that thin, alternate your clamps, ie every second facing up, lay your glued timber down then drop tour other clamps in between facing down..
    I would love to grow my own food, but I can not find bacon seeds

  9. #8
    Join Date
    Jul 2005
    Location
    Oberon, NSW
    Age
    63
    Posts
    13,354

    Default

    Quote Originally Posted by auscab View Post
    Alternate the heart side up down up across the three
    This.

    With timber that thin, I'd be using cauls across top & bottom to hold it flat. (Heh. Actually, I recommend cauls for any panel glue up like that, regardless of thickness. After all, although we often use 'em that way, clamps are not designed to hold it flat)
    I may be weird, but I'm saving up to become eccentric.

    - Andy Mc

  10. #9
    Join Date
    Oct 2013
    Location
    Perth, Australia
    Posts
    1,813

    Default

    Thanks all! I'll make sure the heart is alternating and have just remembered me and dad made some panel clamps a couple of years back which are perfect for this job. Just need to remember where they are and actually use them this time [emoji23]

    Will have a thread up with photos of the saw till once I have something to show, the panel was the first part I worked on so nothing else ready yet.

  11. #10
    Join Date
    Jul 2011
    Location
    In between houses
    Posts
    1,784

    Default

    Maybe do it in stages, three boards at a time, don’t over tighten.

Similar Threads

  1. Panel Max glue press
    By John Samuel in forum WOODWORK - GENERAL
    Replies: 45
    Last Post: 15th December 2019, 11:41 AM
  2. Panel glue up without clamps
    By derekcohen in forum FURNITURE, JOINERY, CABINETMAKING - formerly BIG STUFF
    Replies: 20
    Last Post: 4th May 2018, 04:22 PM
  3. Damn CA glue bottle tips
    By Poloris in forum WOODTURNING - GENERAL
    Replies: 12
    Last Post: 9th April 2015, 05:57 PM
  4. Glue-up Tips and Comments
    By Ekim in forum GLUE
    Replies: 0
    Last Post: 25th July 2012, 12:50 PM
  5. Warped Panel Doors
    By nt900 in forum WOODWORK - GENERAL
    Replies: 6
    Last Post: 28th October 2006, 11:47 PM

Posting Permissions

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