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Fellows Sprocket-Wheel Cutter (US 579,708, Fig. 20): The 3D Model
A 3D model of the cutter c3 that Edwin R. Fellows drew in Fig. 20 of US 579,708 (1897) for cutting the teeth of a sprocket-wheel. It has seven broad teeth with narrower recesses between them, as his text says: "the teeth being longer than the intervening recesses."
The patent gives no dimensions and no mathematical tooth form for this cutter, so its profile was traced off the patent drawing. Fig. 20 shows the cutter only from the cutting end. The body behind the teeth is therefore an assumption: the shank, hollow and dished face are copied from the gear cutter of Fig. 11. It is a display and teaching model, not a working tool.
Intermediate
Several hours of printing; the slicer reports the exact time
Instructions
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1
The cutter in Fig. 20
The cutter in Fig. 20
Fellows: "In Fig. 20 I show a cutter c3 formed to cut a sprocket-wheel, the teeth being longer than the intervening recesses." The drawing shows c3 from its cutting end, rolling against a sprocket rim on its arm. Earlier teeth of the rim are already shaped, and the one in front of the cutter is being generated. The same machine and the same rolling motion that cut gear teeth cut sprocket teeth. Only the cutter's profile changes.
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2
The model in 3D
The model in 3D
Spin the cutter in the viewer and look at its cutting face. The seven teeth follow Fellows's own outline: it was traced from the patent drawing, not drawn anew. It was built in FreeCAD and saved as one joined .blend mesh, editable in free Blender.
Tools needed:
Desktop Computer3
3
Print it
Print it
Stand it on its cutting face with the shank up. The dished face is a near-flat overhang and the hollow has a 24 mm flat roof, so turn on supports from the build plate. PLA is fine for a display model. The real cutter is hardened steel.
Materials for this step:
PLA Filament - Black (1.75mm, 1kg)1 kitTools needed:
3D PrinterMaterials
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Tools Required
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