Hanno,
thanks for allowing this thread to continue as a separate discussion.
David,
I am led to believe that the outer band on the track is used to stabilise the grouser plate. There should not be any difference between the early and later outer bands. If you are running a 56 grouser track the outside daimeter of your sprocket drive wheel should be about 298mm. When the track was reduced to 55 grousers the outside diameter of the sprocket drive wheel was increased to 304mm. So it depends on how many grousers in your track as to what the diameter of your drive wheel should be. The change has to do with the timing of your sprocket teeth to your grouser plates as the distance between the grouser plates was increased from 57.15mm (track pitch of 114.3) between centres to 60mm + 57.15mm(track pitch = 117.1mm). The other critical dimension to consider is the height your sprocket drive wheel is offset from the grouser plate. The original inner band measured about 25.4mm thick but Toms inner bands (like mine) are only 20mm thick. This means that the drive tooth is engaging the grouser plate by another 4.5mm. From the feedback I get from Tom this does not appear to present any timing problems.
That's about all for now.
Cheers
John Wilson
|