Official Answer
Answer
Icyuma cyangwa radiyo ku gice cyagumishijwe (urugero, kwifata) bigabanya ahantu heza ho guhurira hamwe nimpeta ya spiral kandi ikazana imbaraga zingirakamaro ziteza imbere 'kuroba.' Byinshi byemewe chamfer $ c $ mubisanzwe bigarukira kuri $ 50 \% $ yurukuta rwa radiyo yumurongo $ w $. Niba chamfer ari nini cyane, umutwaro ushyirwa kure kurukuta rwa groove, ukongerera umwanya ukuboko kandi biganisha kumpeta imburagihe. Mu bihe nk'ibi, 'backup washer' hamwe nu mfuruka ityaye igomba gushyirwa hagati yikintu cyometse hamwe nimpeta igumana kugirango harebwe gusa umutwaro woherejwe.
