Countersunk da wadanda ba countersunk ba iri biyu ne na asali na ƙirar kan dunƙule. Kawukan da ba na countersunk sun haɗa da kawuna masu ɗaure kai, kawunan maɓalli, kawunan silinda, kawuna masu zagaye, kawunan flange, kawunan hexagonal, kawunan kwanon rufi, madauwari, murabba'i, kawunan truss, da sauransu, yayin da ƙirar kan ƙirƙira galibi sun haɗa da kawuna lebur, ellipses, da shugabannin ƙaho.
An ƙera shugaban dunƙulewa na countersunk don a haɗa shi da ko ɗan ƙasa da saman kayan bayan an gama shigarwa. Yana da siffar juzu'i tare da tsintsiya madauri a saman. Manufar ramin countersunk shine don ƙirƙirar ƙasa mai santsi da ɗaiɗaiɗi bayan ƙarfafa dunƙule. Lokacin da aka shigar da dunƙule mai ƙima, shugaban zai kasance mai jujjuyawa tare da ko dan kadan a ƙasan saman kayan, yana samun kamanni mara kyau. Ana amfani da sukurori na Countersunk yawanci lokacin da ake buƙatar fili mai laushi da santsi, kuma ana amfani da su a cikin aikin itace, kabad, da aikace-aikace waɗanda ke ba da fifikon ƙaya da tsaftataccen layi.
A daya bangaren kuma, kawunan dunkulallun da ba na countersunk ba su da siffa mai madaidaici ko saman mazugi, tare da fallasa kan gaba daya. Manufar tsara su ba shine don zama mai laushi tare da saman kayan ba. Akasin haka, suna da kawuna masu girma, lebur ko madauwari waɗanda har yanzu ana iya gani da zarar an ƙara dunƙule dunƙule. Lokacin da bayyanar dunƙule ba abin damuwa ba ne kuma ana yarda ko wajibi ne a yi amfani da kawuna masu tasowa ko masu tasowa, galibi ana amfani da kawuna marasa ƙima. Ana amfani da waɗannan kusoshi galibi wajen gini, aikin ƙarfe, da aikace-aikace waɗanda ke ba da fifikon ƙarfi, dorewa, da aiki akan ƙayatarwa.
Lokacin aikawa: Janairu-02-2025