I need to make mortises in hard maple. Some up to 1 1/4″ wide X 2 1/2″ long X 3″ deep (tenon will go all the way through). I have access to a 5/8″ mortiser which in theory could be used with multiple passes to make such a mortise. But the problem is how to mortise so that opposite sides of the chisel are being equally supported on each cut when making multiple passes?
An alternative is to use a drill press with forstner bits. This seems to require substantial chisel work to clean up the cuts and much less control over the accuracy of the work?
I do not have access to a router. Will a plunge router be able to produce such deep mortises?
Thanks for oyur comments.
HT
Replies
If you're making mortises wider than your widest chisel, a good strategy is to use a chisel a bit less than half the final width and mill two mortises, leaving a bit of waste in the centre. This waste can be easily cleaned out with one quick final pass on the mortiser or by hand with a sharp chisel. With one side of the chisel unsupported, you run the risk of deflecting the bit or moving the stock if your clamping system is less than ideal (a common problem with the bench-mount machines I've used).
As far as using a router, I see no problems if you take light cuts. A heavy cut may run the risk of running out a bit in such a deep cut.
Nat
Thank you kindly. The solution suggested in your first paragraph is what I was hoping could be done. Thanks for helping a novice.HT
You're pushin' it to rout 3" with a router.
But you can dig a pretty deep hole with this, then drill the rest of the way through on the drill press, flip the work over and attack from that side with an ordinary trimmer and router.
Let the trimmer bearing roll on the machined surface of the 1/2 mortice; it will copy that excavation as a templet.
Thanks for your help. A novice appreciates getting help from those more experienced.
HT
You might try a combination of drilling most of the material out with a forstner bit then cleaning out the rest with a plunge router with a jig.
Troy
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