A Mantua plastic Goat frame is used as an example with NWSL 72 DP gears.
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Layout, side view.
All vertical measurements referenced to axle center.
Measure from top of axle slot with bearing in place to top of frame (.149"),
add axle R (.0625") = frame hight (.21").
Next determine gear center spacing (S) from NWSL info.
br>10T = .150" PD--36T = .500" PD-- Recommended clearance C = .004".
S = PD1 /2 + PD2 /2 + C = .150/2 + .500/2 + .004 = .329"
The bearing OD = .125"-- OR = .0625". Subtract this from S to get the maximum plate top hight (.266").
NOTE: If plate is grooved ~.005" add this to max hight and to motor shim value elsewhere.
Subtract the frame hight from the max plate hight to get the max plate thickness.
Max plate thickness = .266" - .210" = .056"
This is the absolute maximum plate thickness. Any value above this will not permit proper gear mesh.
Choose some convenient combination of .5" strip stock that adds up to a value less than .056". ie: 2 x.025 = .050", .032 +.015 = .047" or even a single .032". Soldering or gluing may add a couple of thousandths, if not clamped very tightly. The sliding adjustment permits a fair range in thickness and the centerline angle from vertical does not effect operation..
