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A Square Bar Cut by the Fellows Four-Lobed Cutter: Fig. 21 Rolled Out
The square that Edwin R. Fellows's four-lobed cutter c' cuts in Fig. 21 of US 579,708 (1897), extended into a bar. The cutter was rolled against a round blank one turn for one turn, as the drawing's arrows show, and every position was cut away. No face was drawn.
Fellows called the faces "plane surfaces". The simulation shows them as very nearly plane: each has about 1 mm of gentle waviness across a 47.6 mm face. The bar's length is a stated choice, because Fig. 21 shows only its cross-section.
Beginner
Several hours of printing; the slicer reports the exact time
Instructions
1
1
How the square was cut
How the square was cut
Fig. 21 shows cutter c' turning against a square blank whose four faces are marked c2. Four lobes meet four faces, so the two turn one for one, in opposite directions. To make this model, the cutter traced from the drawing was rolled one full turn against a round blank. The blank's radius was the drawn square's half-diagonal. Each of the cutter's positions was subtracted. The centre distance used is the one that best reproduces Fellows's drawn square, 2.8% shorter than drawn, as found on the cutter's own blueprint.
2
2
The model in 3D
The model in 3D
Look at the bar end-on in the viewer. Each face is very nearly straight, with a gentle wave the four lobes leave behind. The rolling motion cut every face, and none was drawn. 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 one end. It needs no supports. PLA is fine for a display model. Hold a straightedge across a face to see the slight waviness the cutter leaves.
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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