Huaina te poka koeke tapahia nei te ki tukua te tīwiri upoko flat ki te whakamahi ko te poka countersink. Taea hoki te huaina te reira rite te kohao koeke tapahia e te ki te kiri PCB, he poka i hanga mā te whakamahi i te drill ranei. Ko te whakaaro matua ko te ki kia te matenga o te tīwiri countersunk, kua whakaurua kotahi reira, ka wiria iho i roto i te poka, ki te noho Nini ki te mata o te kiri. Ko te tihi āhua poka, kua tapahia nei ki te kiri PCB, ko te countersink. Kei te te tikanga e whakamahia ana te reira ki te tukua te matenga te topetope o te tīwiri ki noho Nini ki te tihi raro ranei o te kiri.

Kei te nuinga whakamahia reira, kia e taea te tīwiri upoko flat noho Nini ki te mata, ki te whai i te titiro ma, me te tāuta. Ki te whakarite hoahoa tika mo te whakangao, rapua e te nuinga o ngā kaiwhakanao nga taipitopito o te diameter poka. Me hoki ratou ki te mohio, ki te whakakikoruatia te te poka kahore ranei. E matau ana ki te ko te poka pereti kahore ranei he tino no te mea i roto i te tahi mau āhuatanga kia tangata whenua te kohao unplated ki te anga, e taea e meinga he raruraru e e rapu utu whakakikorua ki fakatonutonu. Countersinks te tikanga i he 82 tohu te koki 90 tohu ranei; Heoi, ka taea e e hiahia i te kiritaki ki te whakarato ki te fabricator PCB atu koki.

Hoki kōhao tika o rua countersink, e hiahiatia ana te te mōhiohio e whai ake nei:

▪ Ko tēhea taha o te poari, ko te poka countersink kia tāne, i runga i runga raro ranei?

▪ Ko te totohu, me te take ki te kia i roto i whakakikorua whakakikoruatia-kore ranei?

▪ koki taper koki countersink ranei

▪ Countersink diameter

▪ Ko te diameter oti o te take o te poka

▪ Hōhonu o te countersink ko ki te kia tāne

Kei raro ko te faahoho'araa e whakarato ana i te tauira o te poka countersink:

A: Countersink koki, D: Countersink Diameter, d: Hole diameter, H: hōhonu Hole