Needs Pictures: 0
Picture(s) thanks: 0
Results 1 to 15 of 23
-
31st July 2014, 04:45 PM #1GOLD MEMBER
- Join Date
- Mar 2008
- Location
- Townsville, Nth Qld
- Posts
- 4,236
Hairline gap in mitre joint - HELP
I am in the process of making a jarrah box with 12mm sides 120mm high with mitred corners and a 100mm long hidden spline in each joint running the full length except for the last 10mm each end of each joint (to avoind the lid and the base).
Something has gone wrong in the glue -up / clamping process, and I am left with one joint with a full length hairline gap, uniform for the full height of the box. The joint is strong because of the hidden spline, but unsightly because of the fine gap on the corner ( to me anyway). It appears like the spline on that particular joint is a hairs width too wide.
Can anyone please advise on the best way to fix this so that the gap is not noticable? I have available Techniglue epoxy, PVA glue and jarrah sawdust, and of course jarrah coloured Timbermate. The problem is getting them into the fine gap which runs for 100mm.
I did intend to finish the box by routing a 3mm roundover bit on the corner joints, but will put that on hold for the time being.regards,
Dengy
-
31st July 2014 04:45 PM # ADSGoogle Adsense Advertisement
- Join Date
- Always
- Location
- Advertising world
- Posts
- Many
-
1st August 2014, 09:44 AM #2
-
1st August 2014, 12:41 PM #3
Increase the size of the gap with a saw or router and put a decorative spline in????
-
1st August 2014, 04:52 PM #4SENIOR MEMBER
- Join Date
- Jul 2009
- Location
- inverloch
- Posts
- 472
I seem to remember reading about this some time ago but I am not sure of the details. The idea was that if the outside edge of the mitre doesn't meet the mitre cut is not exactly 45° so you reduce the angle of the cut slightly ( or increase it) and vice-a-versa if the inside is gappy.
Hope this helps.
-
2nd August 2014, 03:05 AM #5Retired
- Join Date
- May 2012
- Location
- Canberra
- Posts
- 1,820
No photo or it didn't happen
I love making boxes, but because I'm so crap at it I've made every mistake 8 times. I think Master Splinter is right, but rather than making a feature/contrast, use an off cut of the same wood and make an ultra fine veneer (bandsaw and sand it flat to thickness). Using a Japanese saw, carefully cut a few mm lengthwise into that long kerf (might need a small jig to get spot on) and glue the new veneer in.
When set, sand it all to a sharp 90 degrees. The grain won't match, but if the colour is the same and you are talking about 0.3 or 0.5mm you might get away with the casual stare.
I do this for the finger joints or dovetail I bugger up. It hides them spectacularly.
Another idea struck me...perhaps you could use a very thin kerf Japanese saw (I have a 0.3mm) and you could saw the whole joint open (through spline and all) and reglue it closed without the spline. (use a syringe with a large bore to get the glue in). The thin kerf saw, at least the thickness of the gap, will cut the right material out to close it.
....it might stress the other three corners a tad, so maybe a quick steam before glueing that corner will help it move.
-
2nd August 2014, 09:00 AM #6GOLD MEMBER
- Join Date
- Mar 2008
- Location
- Townsville, Nth Qld
- Posts
- 4,236
Thanks for this Evanism. Where do you get syringes with large bore needles?
regards,
Dengy
-
2nd August 2014, 03:48 PM #7Retired
- Join Date
- May 2012
- Location
- Canberra
- Posts
- 1,820
Just so happens I'm as crook as a toad eating dog today and was watching the Doug Stowe box making video.
While I can't find the one he was using, which is like an inkjet cartridge filling setup, Carbatec have a few syringes with big bores: Glue Syringes : CARBA-TEC
I'm pretty sure I've seen big bore needles and injectors like this in woolworths for fine cake decoration.....I'll keep hunting.
Edit: found them. They are called accordion bottles. Here is a sample from Lee Valley: Accordion Bottles - Lee Valley ToolsLast edited by Evanism; 2nd August 2014 at 03:56 PM. Reason: Found item
-
2nd August 2014, 04:22 PM #8GOLD MEMBER
- Join Date
- Mar 2008
- Location
- Townsville, Nth Qld
- Posts
- 4,236
Just so happens I have been similarly crook since early Wed morning when I awoke with my throat on fire, and have been poring over Veneering books and videos all week
thanks for your help with the box problem, Evanism. It is sitting on the family room table, all glued up and staring at me until I am well enough to have another go at closing the gap, making some silver ash stringing and cutting off the lid. I'll swear that gap is getting bigger
thanks for the tip about accordion bottlesregards,
Dengy
-
2nd August 2014, 08:19 PM #9
-
2nd August 2014, 08:26 PM #10GOLD MEMBER
- Join Date
- Mar 2008
- Location
- Townsville, Nth Qld
- Posts
- 4,236
-
2nd August 2014, 09:53 PM #11Senior Member
- Join Date
- Jun 2013
- Location
- Geelong
- Posts
- 428
If you are looking for srynges try a pet stock place, lots of different sizes ie cat dog goat horse. They are usually pretty inexpensive
cheers
-
4th August 2014, 07:13 PM #12SENIOR MEMBER
- Join Date
- Jul 2009
- Location
- inverloch
- Posts
- 472
Hi Dengue, I found the reference I was talking about. It is possible you do not have your saw at exactly 45° and if the outside of the mitre is open increase the angle slightly, conversely, if the inside of the mitre is open reduce the angle.
Give it a try.
-
26th August 2014, 11:50 PM #13
You might like to try lightly hammering the edges of the joint to try to deform the timber into filling the gap. I have had some success using this method. PS Use a scrap of something else between the hammer and the work face.
Bob Willson
The term 'grammar nazi' was invented to make people, who don't know their grammar, feel OK about being uneducated.
-
28th August 2014, 06:30 PM #14
-
28th August 2014, 06:57 PM #15
Similar Threads
-
mitre joint
By Didi in forum WOODWORK - GENERALReplies: 18Last Post: 22nd November 2009, 10:41 AM -
Mitre Joint
By m2c1Iw in forum WOODWORK - GENERALReplies: 2Last Post: 5th May 2009, 09:40 PM -
Mitre joint
By sinjin in forum JAPANESE HAND TOOLSReplies: 5Last Post: 14th May 2008, 08:15 AM -
Mitre joint with biscuit joint
By hsc07ww in forum WOODWORK - GENERALReplies: 4Last Post: 30th November 2006, 10:10 AM -
Mitre Joint
By TOMARTOM in forum WOODWORK - GENERALReplies: 1Last Post: 20th August 2001, 09:26 PM