04mustang Posted February 23 Share Posted February 23 Well, after many months have gone by and my primary plan of having new bands made here in the USA have fallen apart, I have decided to just rebuild my own tracks with conveyor belting as that was my very first option anyways. In making up a template I have discovered some questions. In looking at original Studebaker prints on the 56 grouser tracks I have based my template on that pattern. The spacing/pitch is 4.5" center to center and 56 pitches per track. That works out to a length of 252". I have been told on Facebook that the 55 grouser tracks use a spacing/pitch of 4.613" and 55 pitches for a length of 253.715". Now doing the calculations on the radius that works out to 40.37999639" on the 55 count and 40.10704566" on the 56 count. In order for those tracks to be interchangeable, which I'm sure they were, then the inner bands that the road wheels ride on would have to be different thicknesses so that the timing of the sprocket is correct. With that in mind, its common knowledge that the 55 count tracks have 1" thick inner bands. So doing the math on that using the 4.613" pitch, as given on Facebook, and subtracting the 1" thickness for the inner band, you would have a new radius of 39.37999639" and new circumference of 247.4318" for the top of the inner bands. If you then take that circumference of 247.4318" and reverse the calculations to determine the band thickness of the 56 count tracks, I come up with a inner band thickness of 0.72705". This would make sense being that the sprockets don't change and the further away from the center of the sprocket you are, the further apart that the grousers would need to be spaced in order to still be in correct timing. And the closer to the center of the sprocket that you are, the closer together that the grouser would need to be in order to still be in correct timing. Does anyone have more knowledge on this subject that can confirm or deny my assessments here? The 4.613" pitch came from a drawing the someone had that showed the spacing between the grousers was 2.363" from bolt hole to bolt hole, then adding the 2.25" spacing of the distance between the bolt holes on grousers. On the earlier 56 count tracks all of the hole spacings are 2.25" on both the grousers and between the grousers. Quote Link to comment Share on other sites More sharing options...
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