Invest your time in developing a reliable jig. If you are very clever you can make it adjustable for depth and angle so it can be reused for other operations.
remember that the sighted folk use a carpenters square. there is a right angle where the tread meets the riser. They never know or care about the actual angle, they care about the rise & run represented in inches and fractions on the inside scale of the square. They place the rise mark at the junction of the under side of the stringer where it meets the floor, swing the square until the run measure crosses the under side of the stringer then draw lines following the inside of the square. They then move the square up to the point where the run line they drew crosses the lower edge of the stringer, align the inside rise edge of the square to that point and swing the square until the run point again crosses the lower edge of the stringer then draw out the lines again repeating until they reach the top of the stringer. If they calculate it correctly they get an equal number of steps of equal height for comfort and safety. You make your jig the same way only wide enough to plow out enough material to receive the tread and riser. The tread will usually be thicker than the riser but this is easily accomplished with a triangular filler you shift into position then join to the outer limiting template member with a diagonal strip of thicker material at the angle required to achieve your rise and run. Once the router passes over this and cuts the channel it makes aligning each consecutive pair of rise and run slots very easy and precise. You can place a parallel strip to drop over the top of the stringer too making that alignment even more secure if that helps. ----- Original Message ----- From: Dan Rossi To: [email protected] Sent: Monday, May 24, 2010 11:58 AM Subject: RE: [BlindHandyMan] Building stairs. Alan, I agree with you that dadoing will be much more work, and offer many more chances for me to fuck up and have to start again. But you know me well enough now, that more work and complexity just calls to me. *GRIN* -- Blue Dan Rossi Carnegie Mellon University. E-Mail: [email protected] Tel: (412) 268-9081 [Non-text portions of this message have been removed]
