The is the first transmission adapter plate I made from Aluminum. It worked but there were things I wanted to correct and a few features I wanted to add.the 2 major problems with ut was that the holes were not quite right. I modeled them in Solidworks by measuring with a caliper and the were a little off. for the new plate I got the hole locations by scanning the points with the Romer CMM arm and that was far more accurate. the other problem with the old plate was that there weren't enough mounting points for components. there is no sub-frame on this bike and things like body work battery, tanks, accessories have to mount to something. So I added a number of threaded holes that framework or parts can be securely bolted to. This includes that method for the main motor mounts which you will see later.
Cutting the 3/4 6061-T651 aluminum stock to size on the table saw.
The part just fits with the piece of aluminum I have.FSM for ridged tapping in the VMC. all 39 holes drilled and tapped in under 6 minutes. I could have pushed it a little faster but I live in fear of breaking taps. It's a fast way to scrap a part. Sometimes you can recover, but often when the tap snaps it can slightly move the work piece and that throws every subsequent operation out coordinate wise. Even if it doesn't move the part you still have a broken tap in one of your holes and they can be difficult to get out without damaging the aluminum around it. Either way it's ugly.
Details of the thread, and champher details.
The Finished plate
The new plate (right) next to the original
With the Transmission mounted.
Not the final placement, but engine and transmission assembly resting roughly in place for perspective.