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Sorry Arnold, I dabbed my toe in the water here to see if there was any interest in the model engine gear design problem and other than yourself there is none .As you know I was never sure if it was appropriate to post this engine design/build on this site so I am thinking of moving this thread to Chatterbox and not posting further on this build. Jo
One of the interesting "faults" in the Hanning Drawings was that way in which all the road gears were all 8DP. The consequence of this is that the 2nd and 3rd shafts had to move. Resulting in all sorts of issues including miss shaped Hornbrackets, wrong numbers of teeth and hence gearing On a normal traction engine each of the shafts has a different DP. I found that by copying the original shaft location for the BB1 and using the free Gear calculation program that using 7, 8 and 9 DP gears I could put the shafts back in their correct position and the number of teeth on each gear are nearly spot on the original Jo