Woodchips2
Established Member
I’ve been using a Joint Genie dowelling jig for a while making shelving units, stud partitions, cupboard doors and the like and have been very pleased with the results. I use a shooting board to ensure I get accurate matching surfaces for the glued joint. However I wondered how strong a dowelled joint is compared with a traditional mortice and tenon. Also I’ve thought about buying a biscuit jointer.
I had a search on the internet and found this site http://www.dowelmax.com/jointstrength.html where hydraulic tests had been carried out and you can view the videos of the tests. The test was done by Dowelmax which looks a lovely bit of kit but does the same job as a Joint Genie.
The test results were:
20 Biscuit 285 lbs. per square inch
Pocket hole (5 screws) 420 lbs. per square inch
Double Domino 560 lbs. per square inch
Routed mortice & tenon 640 lbs. per square inch
Multiple dowel 890 lbs. per square inch
They only used a 1” depth of penetration so I presume a through mortice and tenon would be stronger than the test results.
Think I’ll stick with my Joint Genie and not bother with the biscuit jointer.
Regards Keith
I had a search on the internet and found this site http://www.dowelmax.com/jointstrength.html where hydraulic tests had been carried out and you can view the videos of the tests. The test was done by Dowelmax which looks a lovely bit of kit but does the same job as a Joint Genie.
The test results were:
20 Biscuit 285 lbs. per square inch
Pocket hole (5 screws) 420 lbs. per square inch
Double Domino 560 lbs. per square inch
Routed mortice & tenon 640 lbs. per square inch
Multiple dowel 890 lbs. per square inch
They only used a 1” depth of penetration so I presume a through mortice and tenon would be stronger than the test results.
Think I’ll stick with my Joint Genie and not bother with the biscuit jointer.
Regards Keith