IṢẸ́ ỌNÀ
ẸWÀ ÀTI ÌLERA
IṢẸ́ ỌWỌ́
ÀṢÀ ÀTI ÌTÀN
ÌṢERÉ
ÀYÍKÁ
OÚNJẸ ÀTI OHUN MÍMU
REVERSE ENGINEERING
SÁYẸ́ǸSÌ
ERÉ ÌDÁRAYÁ
ÌMỌ̀-Ẹ̀RỌ
ÀWỌN OHUN WÍWỌ̀
Spur Gears, 20 Teeth: Cut One Space at a Time on a Dividing Head
Without a hobbing machine, a spur gear is cut one tooth space at a time: a formed involute cutter on a milling machine, the blank turned by a dividing head between cuts. On a 40:1 head, a 20-tooth gear is two full turns of the crank per tooth. Eight involute cutters cover every gear from 12 teeth to a rack.
The picture: cutting a spur gear with the spiral (dividing) head, from "A Practical Treatise on Milling and Milling Machines".
Ilọsíwájú
A day for a pair
Ìlànà
1
1
Turn the blanks
Turn the blanks
Saw two slices of round bar and turn each to the outside diameter the cutter's data gives for your module and 20 teeth. Bore the centre to fit the mandrel and face both sides.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Ọ̀pá rírọ irin rírọ̀1 ẹyọÀwọn irinṣẹ́ tí a nílò:
Ayùn Irin
Ẹ̀rọ Ìyí Irin
Àkójọ Irinṣẹ́ Yíyí Igi HSS
Òróró gígé
Kálípà Fáníà2
2
Set up the head
Set up the head
Press a blank onto the mandrel and mount it between the dividing head and its tailstock on the milling table. Fit the involute cutter for 20 teeth of that module and centre it over the blank.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ Ìgégé Irin
Orí Ìpínyà
Ọ̀pá mandrel
Ohun gígé eyín gíà involute3
3
Cut, index, cut
Cut, index, cut
Set the depth from the cutter's data, cut the first space with oil, back off, give the crank two full turns, and cut the next. Repeat until all 20 spaces are cut and you are back at the first.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ Ìgégé IrinOrí ÌpínyàOhun gígé eyín gíà involuteÒróró gígé
Gíláàsì ààbò4
4
Second gear and deburr
Second gear and deburr
Cut the second blank the same way. Deburr the tooth edges and check that the pair mesh smoothly at their centre distance (the sum of the two pitch radii).
Àwọn irinṣẹ́ tí a nílò:
Ohun èlò ìmúkúrò èèpoKálípà Fáníà5
5
Indexing 20 teeth
Indexing 20 teeth
Ń ṣí ìwé Jupyter…
Àwọn ohun-èlò
1- 1 ẹyọÀyè
Àwọn irinṣẹ́ tó nílò
11- Àyè
- Àyè
- Àyè
- Àyè
- Àyè
- Àyè
Ìtọ́nisọ́nà yìí ń ṣe
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