Me pēhea te tohu i te koki R o te ngongo tapawhā i roto i te paerewa ā-motu?

Ko te koki R i roto i te ngongo tapawhā ko te pewa whakawhiti i te hononga o ngā papa e rua, ko te tikanga ko te haurua o te diameter o te raina pokapū o te pewa piko koki R. Ko te uara o te pewa piko R ko te tikanga 1.5~2.0 ngā wā o te diameter o te paipa. Ka whakatauhia te rahi o te koki R i runga i te matotoru o te pakitara o te ngongo tapawhā. Ka wehea te koki R ki te koki R ā-roto me te koki R ā-waho. Ko te R ā-roto ko te tikanga 1.5~2 ngā wā o te matotoru o te pakitara. Ka taea hoki te whakaputa i ngā ngongo maitai tapawhā me ngā koki R rerekē i runga i ngā hiahia o te kaiwhakamahi.
Hei tauira, mō tētahi paipa maitai tapawhā rite me te pewa porowhita R, A=1.0MM, te whakarara=1.15MM, me pēhea e mōhio ai koe ki te koki R? Mena he paipa maitai tapawhā rite me te pewa, he rite tonu te tikanga tatau? Ko te roa o tētahi tapawhā rite ko A, ko te whānui ko B, ko te whakarara ko C, ā, he ōrite te pūtoro o ngā pewa kokonga e whā ko R. Tātaihia te rahi o R mā te tātai e whai ake nei: (C/2-R) ^ 2=(A/2-R) ^ 2+(B/2-R) ^ 2 C ^ 2/4-CR+R ^ 2=A ^ 2/4-AR+R ^ 2+B ^ 2/4-BR+R ^ 2 4R ^ 2-4 (A+BC) R+(A ^ 2+B ^ 2-C ^ 2)=0.
Me whakanui i konei ko te koki R o te ngongo tapawhā raro kāore e pā ana ki te pewa, engari ki te koki pokapū. Ko te pewa e pā ana ki tētahi wāhanga i runga i te porowhita, ā, ko te koki kei roto i te rārangi i waenganui i ngā pito e rua o te pewa me te pokapū ko te koki pokapū. Nā te mea ko te porowhita o te porowhita he 2 π R, ā, ko tōna koki pokapū e rite ana ko te 2 π, ko te roa o te pewa e rite ana ki te koki pokapū kotahi ko te 2 π R/2 π=R. Nō reira, ka whiwhihia te roa o te pewa e rite ana ki tētahi koki pokapū a (te kotahi radian)=aR. Ko ngā tikanga me ngā taputapu ine mō te koki R o te ngongo tapawhā ko te ine R me te pūwhakaata. Ka taea te whakamahi i te ine R mō ngā pūwāhi matotoru, te pūwhakaata mō ngā pūwāhi angiangi, me te CMM mō ngā whakaritenga teitei.