@ltilton, if you are interested can you walk us through step by step your grafting procedure. There must be something common because if you are doing apples/pears it does not make sense to have 0% takes.
Where do you get your scion wood from (eg. private or commercial sources, what growing zone). What zone are you.
When is the wood cut.
Is it treated prior to shipment.
How long from cutting to shipping is it and how is it stored during that period.
How is it shipped to you (regular post, express, ect).
How was it packaged. (loose, ziplock, ziplock with wet paper, wrapped in parafilm, ect)
How long from shipping to arrival.
Once you get it how do you store them.
When do you start grafting? Eg. what date and what is going on at that time? Snow still on ground with everything dormant and many freezes still to come? Before last frost but buds swelling? Leaves at 1/4 inch green?
How do you do your grafts?
What are you using to cut first. Shears, knife.
Are you cleaning your knife between cuts (10% bleach, pine sol, 70% alchohol) and if so are you drying thouroughly?
What grafts are you doing? Cleft, whip, bark? Can you carefully unwrap some dead grafts and take close, in focus images of the union?
If you can't take photos can you draw out what they looked like?
How well did the cambium match up? EG. on a cleft graft was your scion wood fully within the cleft (eg outer bark even) or was the scion slightly protruding outside the cleft so the bark does not fully match but the cambium is touching.
Then how do you protect? What do you wrap with? Wax first? Parafilm first? Plastic wrap first? Then do you anchor with electrical tape, rubber bands, ect?
Do you do anything with the scion above the graft? Wrap in parafilm, paint with wax, ect.
Give us all this info and perhaps we can figure out what is going wrong. for 0% takes on apple/pear there is either something wrong with your scion wood, or there is a reproducible error or deadly step in your process because apple and pear WANT to work as long as the cambium is even close to each other.