No assembly done at shop, everything is cut and fitted at the job site, and yes Gerald, the right side of the stairs is self supporting

Both stringers were laid to proper run and rise before being bent, a lot easier laying them out when flat. Angle iron is then screwed to the stringers, using a jig I made in the shop, we then make a template of the tread, lay jig on the tread, and cut the treads to length using a band saw. We made the treads 2" longer than needed, giving us an inch to cut off each end

Using another shop made jig, the bottom, and end the tread is routed out so the angle iron is concealed, there is a curved plate that will go on the underside of the tread. And edge sander is used to sand out the saw marks on the wide side, and a belt sander to sand the narrow side. Me and the boss worked 8 hours on Friday and only got 6 treads put in, very time consuming work

I can tell that this will be a thing of beauty when you have completed it.  It looks like everything is fit to pretty close tolerances.  What allowances are made for wood movement?

11 hours ago, Cal said:

I can tell that this will be a thing of beauty when you have completed it.  It looks like everything is fit to pretty close tolerances.  What allowances are made for wood movement?

No tolerance/allowance is taken into consideration, we dont stain and or seal, varnish our projects, thats a whole different ball game! When we get our stairs put in, it's all sanded up and ready for the finish. Sometimes contractor's will leave the stairs unfinished for weeks on end, then things can go wrong with expansion/or shrinkage. 

Absolutely amazing. I don't how y'all get it done that fast even.

That is just beautiful!!!

Very nice work !

Paul