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НОСИМЫЕ УСТРОЙСТВА
A Sprocket Wheel Cut by the Fellows Cutter: Fig. 20 Rolled Out in Full
The sprocket wheel that Edwin R. Fellows's cutter c3 is cutting in Fig. 20 of US 579,708 (1897), completed all the way round. The traced cutter was rolled against the blank as his machine rolls them, and every position was cut away. Its tooth count, centre distance and rim come from measurements on the drawing.
Overlaid on the patent drawing, the generated teeth land on Fellows's own drawn teeth. The drawing shows the rim and one broken-off arm, so the arm count, hub, bore and thickness are stated choices.
Начинающий
Several hours of printing; the slicer reports the exact time
Инструкции
1
1
What Fig. 20 shows, and what was measured
What Fig. 20 shows, and what was measured
Fig. 20 shows cutter c3 rolling against a sprocket rim on an arm. One tooth of the rim is finished, one sits in a recess of the cutter, and a dashed line marks the next before it is cut. Measured on the 300 dpi scan at the cutter's scale: two adjacent drawn teeth are 20.5 to 21.0 degrees apart about the rim's centre, depending on how each tooth's centre is taken, which gives 17.2 to 17.6 teeth. Both 17 and 18 were generated and fitted to the drawn teeth. The 18-tooth wheel lies closer: its median distance to the drawing is 1.0 mm, against 1.4 mm for 17. The cutter's centre is 119.4 mm from the wheel's. The uncut rim surface is at a 93.6 mm radius. With those numbers, rolling the cutter cut a root at 81.95 mm, against the drawn root line at 82.26 mm.
2
2
The model in 3D
The model in 3D
Spin the wheel in the viewer. Its eighteen teeth were cut by rolling the Fig. 20 cutter against the rim, not drawn. Overlaid on Fellows's drawing, they sit on his finished tooth, on the tooth in the cutter's recess and on his dashed outline. It was built in FreeCAD and saved as one joined .blend mesh, editable in free Blender.
Необходимые инструменты:
Настольный компьютер3
3
Print it
Print it
Lay it flat on one face. It needs no supports, but the bed must be at least 187 mm across. PLA is fine for a display model.
Материалы для этого шага:
PLA-пруток — чёрный1 наборНеобходимые инструменты:
3D-принтерМатериалы
1- 1 наборЗаполнитель
Требуемые инструменты
2- Заполнитель
- Заполнитель
Материалы из связанных чертежей
Связанные чертежи
Эти чертежи делятся знаниями — техники, материалы или принципы
CC0 Общественное достояние
Этот чертёж выпущен под лицензией CC0. Вы можете свободно копировать, изменять, распространять и использовать эту работу в любых целях без запроса разрешения.
Поддержите мейкера, покупая товары через его чертёж, где он получает Комиссию мейкера установленную продавцами, или создайте новую итерацию этого чертежа и включите его как связь в свой чертёж для распределения дохода.