As they say on blue peter here's one I made earlier...2 years ago in fact.
They are both within 2 miles of home so checking bolts for tightness isn't a problem though the first one has not needed tightening yet. I have watched demos of scribing several times and Japanese framing but I am not a timber framer. I very much admire old framing particularly the roof trusses in the old barns round here, rustic but beautiful. I like wooden boat building too. Still not sure how housing would help keep upright in contact with beam as it shrinks? Sure it would give it more side to side rigidity but it gets that from the 3 rails anyway. One way I could think of that would keep upright in contact with beam without the bolt would be a proper joint, a dovetail or mortice and tennon both of which would need a considerably larger main beam to give space for the joint and still leave enough tread to walk on.
I am relying on a single large bolt but it is well tested technology, the principle rafters in my barn are scarfed with just such a bolt (150 yrs plus old), another bridge in Edale built about 50 years ago has similar threaded bar plus nuts to hold the uprights on and its going strong.
They are both within 2 miles of home so checking bolts for tightness isn't a problem though the first one has not needed tightening yet. I have watched demos of scribing several times and Japanese framing but I am not a timber framer. I very much admire old framing particularly the roof trusses in the old barns round here, rustic but beautiful. I like wooden boat building too. Still not sure how housing would help keep upright in contact with beam as it shrinks? Sure it would give it more side to side rigidity but it gets that from the 3 rails anyway. One way I could think of that would keep upright in contact with beam without the bolt would be a proper joint, a dovetail or mortice and tennon both of which would need a considerably larger main beam to give space for the joint and still leave enough tread to walk on.
I am relying on a single large bolt but it is well tested technology, the principle rafters in my barn are scarfed with just such a bolt (150 yrs plus old), another bridge in Edale built about 50 years ago has similar threaded bar plus nuts to hold the uprights on and its going strong.