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What Filler???

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bee View Drop Down
Old Croc
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bee Quote  Post ReplyReply Direct Link To This Post Posted: 13 March 2017 at 9:33pm
Originally posted by snowflake snowflake wrote:

imagine you have a perfect glued joint using a perfect material. the joint will bend to some extent without breaking. as you bend it the stress is uniformly distributed being equal at every point along the joint. now imagine you put a screw in at one point. the joint here now becomes stiffer and less able to bend. so when force is applied all the stress is focussed on the point where the screw is. the screw fixing is not able to take all the stress that was formerly distributed evenly along the joint and the wood begins to split starting where the screw is. it is possible to make metal joint reinforcements that strengthen the joint but they would look like brackets, not screws.

this situation with ply is slightly different as the layers of ply are not that well stuck together. the screws strengthen the joint not by holding the two pieces together, but by stopping the piece that is glued side on from delaminating internally.

try breaking some joints apart. if you have done it properly you will find that it is always the wood that has split apart, not that the glue has failed between the two pieces.

if you find your glue is failing you have either not cut the wood straight and there are big gaps in the joint, or you have a very close fitting joint and it has gone dry due to over-clamping.
 
a good plywood joint that can be made with a rail saw and how I would make joints if I could find the right router bits. rebated joints are often good enough and quicker to make though.


 
very good explanation Clap


Edited by bee - 13 March 2017 at 9:52pm
https://www.elements-audio.com
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SouthwestCNC Quote  Post ReplyReply Direct Link To This Post Posted: 13 March 2017 at 9:48pm
Originally posted by snowflake snowflake wrote:

a good plywood joint that can be made with a rail saw and how I would make joints if I could find the right router bits. rebated joints are often good enough and quicker to make though.




https://www.infinitytools.co.uk/router-bits/lock-mitre-bit/
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markie View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote markie Quote  Post ReplyReply Direct Link To This Post Posted: 16 March 2017 at 1:10pm
Is this the answer? Using this would put screw heads inside the cab so no filler needed.

https://www.youtube.com/watch?v=ZHuCMzAIpDs
If it's got wheels or tits it's gonna cost a fortune
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Young Croc
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 70,s hero Quote  Post ReplyReply Direct Link To This Post Posted: 16 March 2017 at 4:20pm
Thas a handy bit of kit
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snowflake View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote snowflake Quote  Post ReplyReply Direct Link To This Post Posted: 19 March 2017 at 4:22pm
ah they do make these - bit different to my idea but only need one router bit:

http://www.leevalley.com/us/wood/page.aspx?p=69422&cat=,69419&ap=1
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shortrope Quote  Post ReplyReply Direct Link To This Post Posted: 19 March 2017 at 5:04pm
My Tinnitus is coming along nicely!!
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bee View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bee Quote  Post ReplyReply Direct Link To This Post Posted: 19 March 2017 at 11:53pm
kregs are very nice, another option to the trend look at the ujk pocket hole jig.
 
https://www.elements-audio.com
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