Muganire ku gukwirakwiza impagarara mu mpeta igumana impeta mugihe cyo kwishyiriraho nuburyo bifitanye isano na seti ihoraho.

Mugihe cyo kwishyiriraho, impeta yaguwe hejuru yumutwe cyangwa igasezerana. Impagarike ntarengwa ya fibre iboneka kuri fibre yimbere yimpeta zo hanze kandi itangwa na $ S = \ frac {E t (D_s - D_i)} {(D_s - t) (D_i + t)} $, aho $ D_s $ ni diameter ya shaft naho $ D_i $ ni indangamuntu. Niba $ S $ arenze imbaraga zumusaruro $ S_y $, impeta izahinduka muburyo bwa plastike (gushiraho bihoraho). Kuri 302 Impeta zidafite ibyuma, impungenge zo kwishyiriraho zigomba kugarukira kuri 80 ku ijana bya $ S_y $. Agasanduku k'ibikoresho byo mu kirere, 'tapered' ibice by'impeta rimwe na rimwe bikoreshwa mugutanga impagarara nyinshi zo gukwirakwiza impeta.