Reply To: Mortising jig
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I think Paul is almost certainly setting the depth of the router by trial and error. Making small marks from either side of the work, then checking with his chisel to see if it’s close. Aim for a dimension a hair wider than your chisel. The extra can be pared off after chopping the mortise.
I did something similar but used a mortise gauge set a little wider than my mortising chisel and I ran the gauge from one reference surface only. I used trial and error to get the gauge lines very close to perfectly centered on the work. I laid out my chisel guide block with the same gauge setting.
Whatever the final router depth I used in making the guide block, I kept that depth setting and used it for the final trimming of the tenon cheeks. As Paul does, I still had to make use of two router planes; one set for the final cut and the other to get close.
Hope this helps!
- This reply was modified 6 years, 8 months ago by Harvey Kimsey.