UBUCIKO
UBUHLE NEMPILO
UBUCIKO BEZANDLA
AMASIKO NOMLANDO
EZOKUZIJABULISA
IMVELO
UKUDLA NEZIPHUZO
REVERSE ENGINEERING
IZAYENSI
EZEMIDLALO
UBUCHWEPHESHE
IZINTO EZIGQOKWAYO
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.
Ophakathi
Several hours of printing; the slicer reports the exact time
Imiyalelo
1
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.
2
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.
Amathuluzi adingekayo:
Ikhompyutha Yasetafuleni3
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.
Izinto zokwakha zalesi sinyathelo:
I-filament ye-PLA - emnyama1 ikhithiAmathuluzi adingekayo:
Iphrinta ye-3DIzinto
1- 1 ikhithiIsibambeli
Amathuluzi Adingekayo
2- Isibambeli
- Isibambeli
Izinto Zokwakha Ze-Blueprint Exhunyiwe
Ama-blueprint ahlobene
Lama-blueprint abelana ngolwazi — amasu, izinto noma izimiso
CC0 Isizinda Somphakathi
Le blueprint ikhishwe ngaphansi kwe-CC0. Ukhululekile ukukopisha, ukuguqula, ukusabalalisa, nokusebenzisa ngaphandle kwemvume.
Sekela uMenzi ngokuthenga imikhiqizo nge-Blueprint yabo IKhomishane Yomenzi kumiswe ngabathengisi, noma dala inguqulo entsha yale Blueprint bese uyifaka njengoxhumaniso ku-Blueprint yakho ukuze wabelane ngemali engenayo.