M&T Design Help

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    Hey all, wondering if some more experienced members might be able to give me some advice.

    I’m working on a “Toddler Tower” design with 4x 30x30mm Pine posts, with 20x40mm rails. Ideally the rails would be flush with the outside of the posts, and the joinery shouldn’t be visible.

    My plan was to use a 10mm tenon, 6mm inset from the outside of the posts. This seems like very little material to leave when chopping the mortises though. Should I revise my plan? Would 6mm tenons be more appropriate? That seemed a little thin given the size of the stiles, but the other option is to use a bare faced tenon, and I don’t really want to have the join show.

    I only have $10 of material invested in this project, but I would like to save the time having to replace any material, since I’m somewhat under the gun. Any advice would be greatly appreciated.


    I had to look up what a “Toddler Tower” was.
    Stronger and over built is going to be best.
    Any advise on the construction of same might be a liability if something based on said advise should fail.
    I’ll pass

    SW Pennsylvania


    Hello moooncabbage,
    I’ll do one of these:

    – 8 mm tenon with 9 mm external shoulder and 3mm internal shoulder.
    – 10mm barefaced tenon

    although I think that if your joints are tight a traditional aproach of 1/3 tenon should be strong enough too.

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