Udindo wa Granite Yachilengedwe mu Makina Oyezera Ogwirizana Amakono (CMM)

Kufunika koyambira kwa zipangizo zomangira mu makina oyezera ogwirizana sikunganyalanyazidwe. Mosiyana ndi zida zambiri zolondola komwe njira yoyezera imachitika pamalo olamulidwa olekanitsidwa ndi kapangidwe ka zida, ma CMM ayenera kuyika makina awo oyezera m'malo atatu pomwe akusunga kutentha koyenera ndi ntchito yomwe ikuyesedwa. Kapangidwe ka makina kayenera kupereka kulimba kwapadera kuti achepetse kupotoka pansi pa mphamvu za probe, kugwedezeka kwabwino kwambiri kuti alekanitse muyeso kuchokera ku zosokoneza zachilengedwe, kukhazikika kwa kutentha kopambana kuti apewe kusuntha kwa miyeso, komanso kukhazikika kwa miyeso kwa nthawi yayitali kuti atsimikizire kusinthasintha kwa muyeso pazaka zambiri zogwirira ntchito. Zofunikira izi zapangitsa opanga kuwunika mosamala ndikusankha zinthu zomwe zingapereke kuphatikiza koyenera kwa zinthuzi, ndi granite yachilengedwe ngati chisankho chomwe chimakondedwa cha zinthu zofunika kwambiri zomwe zimafotokoza kuchuluka kwa muyeso wa makina ndikupereka mawonekedwe ofotokozera omwe miyeso yonse imatchulidwa pamapeto pake.

Granite wachilengedwe umagwiritsidwa ntchito nthawi yonse yomanga CMM, zomwe zimawonekera m'zigawo zomwe zimakhudza kwambiri magwiridwe antchito a muyeso. Maziko akuluakulu ndi tebulo logwirira ntchito zimayimira ntchito zowoneka bwino kwambiri, zomwe zimagwiritsidwa ntchito ngati malo owunikira pomwe zinthu zogwirira ntchito zimayikidwa kuti ziyesedwe ndikupereka kutentha kwakukulu komwe kumathandiza kusintha kwa kutentha. Mu mapangidwe ambiri a CMM, makamaka makina amtundu wa mlatho, mazikowo amaphatikizanso njira zowongolera zolondola zomwe zimafotokoza Y-axis of motion. Mlatho woyenda kapena mtanda, womwe umanyamula mutu wa Z-axis assembly and probe, nthawi zambiri umakhala ndi zinthu za granite zomwe zimapangitsa kutentha ndi makina kukhala bata panthawi yoyezera. Kapangidwe ka mzati, kaya kothandizira zigawo za pamwamba pa kapangidwe ka gantry kapena kupereka malo owunikira m'makina opingasa, nthawi zambiri amagwiritsa ntchito granite kuphatikiza kwake kwa zinthu zonyowa ndi kukhazikika. Kugwiritsa ntchito granite nthawi zonse m'malo ofunikira awa onyamula katundu ndi ma reference kumatsimikizira kuti kapangidwe ka makina onse kamakhala ngati gawo lofanana, lokhazikika pa kutentha m'malo mokhala ndi zinthu zosiyana zomwe zimakhala ndi kutentha ndi makina osiyanasiyana.

Kusankhidwa kwa granite kuposa zipangizo zina zaukadaulo kumachokera ku kuphatikiza kwake kwapadera kwa makhalidwe enieni, chilichonse chikuthandizira pakuchita bwino kwa muyeso m'njira zinazake. Kukhazikika kwa kutentha kumayimira mwina phindu lofunika kwambiri lomwe granite imapereka pakugwiritsa ntchito molondola metrology. Granite imasonyeza kuchuluka kochepa kwambiri kwa kutentha, nthawi zambiri kuyambira magawo 5 mpaka 8 pa digiri Celsius kutengera mtundu wa granite ndi kapangidwe kake. Kapangidwe kameneka kamakhala kofunikira kwambiri m'malo opangira zinthu komwe kusintha kwa kutentha sikungapeweke, chifukwa ngakhale kusintha pang'ono kwa kutentha kungayambitse zolakwika zazikulu muyeso mu zigawo zolondola. Kapangidwe ka CMM kakakula kapena kusinthasintha ndi kusintha kwa kutentha, ubale wapakati pa geometry yowunikira ya makina ndi ntchito yoyesedwa umasinthasintha, zomwe zimayambitsa zolakwika zomwe zingapitirire kulekerera kovomerezeka kwa zigawo zolondola. Kuchuluka kochepa kwa kutentha kwa Granite kumatanthauza kuti kapangidwe ka makina kamasintha miyeso pang'onopang'ono komanso modziwikiratu ndi kutentha, kulola ma algorithms obwezera kuti akonze zotsatira za kutentha ndikulola makina kuti asunge kulondola pamitundu yonse ya kutentha kwa malo opangira zinthu. Kuphatikiza apo, kusinthasintha kwa kutentha kwa granite, ngakhale sikuli kwapadera, kumalola kuti zinthuzo zifike pamlingo wofanana ndi kutentha mwachangu poyerekeza ndi zipangizo zomwe zili ndi kutsika kwa kutentha, zomwe zimathandiza makina kukhazikika ndikupeza kulondola kotsimikizika pambuyo pa kusintha kwa kutentha kwa chilengedwe.

Makhalidwe a kugwedezeka kwa granite amasiyanitsa granite ndi zinthu zina zambiri zolimba zomwe zimagwiritsidwa ntchito kwambiri muukadaulo wolondola. Ngakhale kuti zipangizo monga aluminiyamu alloys zimapereka chiŵerengero chabwino kwambiri cha kuuma ndi kulemera, nthawi zambiri zimakhala ndi kugwedezeka kwamkati kosakwanira, zomwe zikutanthauza kuti kugwedezeka kumakhalabe kwa nthawi yayitali zikayamba kugwedezeka. Khalidweli limakhala lovuta m'malo opangira zinthu komwe makina, magalimoto pansi, ndi machitidwe a HVAC nthawi zonse amayambitsa kugwedezeka komwe kungasokoneze ubwino woyezera. Granite, monga chinthu chachilengedwe cha polycrystalline, imawonetsa mphamvu zabwino kwambiri zochepetsera kugwedezeka, imatenga mphamvu yogwedezeka ndikuletsa kufalikira kwake kudzera mu kapangidwe ka makina. Kuchita uku kochepetsera kusuntha bwino kumasefa kugwedezeka kwapamwamba komwe kungayambitse phokoso mu deta yoyezera, zomwe zimapangitsa kuti kuwerenga kokhazikika, kobwerezabwereza komwe opanga omwe amaganizira kwambiri amafunikira. Kuphatikiza kwa kuuma kwakukulu ndi kugwedezeka kogwira mtima kumapangitsa kuti nyumba za granite zisavutike kusokonezeka kwamphamvu panthawi yoyezera, komwe mayendedwe ofulumira a probe angayambitse kugwedezeka kogwirizana mu kapangidwe ka makina.

Kukhazikika kwa nthawi yayitali ndi mwayi wina wofunikira womwe wateteza malo a granite pakupanga CMM. Mosiyana ndi zinthu zomwe zingakhudzidwe ndi ukalamba, kuchepetsa kupsinjika, kapena kusintha pang'onopang'ono kwa miyeso pakapita nthawi, granite yosankhidwa bwino ndikukonzedwa imasunga miyeso yake kosatha pansi pa mikhalidwe yabwinobwino yogwirira ntchito. Kukhazikika kumeneku kumachokera ku kapangidwe ka granite kowala komanso kusakhalapo kwa kupsinjika kwamkati komwe kungapumule pakapita nthawi. Gawo la granite CMM likapangidwa mpaka kufika pa geometry yake yomaliza yolondola ndikukhazikika, geometry imeneyo imakhalabe yosasinthika nthawi yonse yogwira ntchito ya makinawo. Khalidweli limakhala lofunika kwambiri kwa opanga omwe amadalira kutsata ndi kusinthasintha kwa muyeso, chifukwa ma CMM nthawi zambiri amakhala ngati zizindikiro zazikulu za miyeso ya machitidwe abwino. Kukhazikika kwa kapangidwe ka granite kumathandizira kuchepetsa kusatsimikizika kwa machitidwe oyezera ndikupangitsa kuti kukhazikitsidwe ndi kusungidwa kwa unyolo wotsatira muyeso kukhale kosavuta.

Kukana dzimbiri kumawonjezera kuyenerera kwa granite pakugwiritsa ntchito CMM. Malo opangira zinthu nthawi zambiri amakhala ndi madzi odulira, zosungunulira zotsukira, ndi zinthu zodetsa mpweya zomwe zingawononge kapangidwe ka makina achitsulo. Granite, monga mwala wa igneous wochokera ku silicate, imapewa kuukiridwa ndi mankhwala onse odziwika bwino opanga ndi zinthu zina zamlengalenga. Kukana kumeneku kumatsimikizira kuti pamwamba pa granite pamakhalabe mawonekedwe awo ndi khalidwe lawo kwamuyaya popanda zophimba zoteteza zomwe zingawonongeke, kusweka, kapena kufunikira kukonzedwa. Kukongola kwachilengedwe kwa granite wopukutidwa kumaperekanso chithunzi cha kulondola ndi khalidwe lomwe likugwirizana ndi ziyembekezo za zida zoyezera zamtengo wapatali.

Poyesa granite poyerekeza ndi zinthu zina, opanga ndi mainjiniya opanga mapulani ayenera kuganizira za kusinthana komwe kumachitika mu njira iliyonse. Chitsulo chopangidwa ndi chitsulo, chomwe chimagwiritsidwa ntchito popanga zida zamakina, chimapereka chinyezi chabwino komanso kukhazikika kwa kutentha koma chimakhala ndi ma coefficients okwera kutentha kuposa granite. Kapangidwe ka chitsulo kamafunikanso kusamala kwambiri kuti achepetse kupsinjika ndi kukalamba kuti akwaniritse kukhazikika kwa mawonekedwe, ndipo kukonza chitsulo chopangidwa ndi chitsulo kumabweretsa nkhawa zokhudzana ndi kapangidwe ka pamwamba ndi kubwezeretsa ma chip. Ma aluminiyamu alloys amapereka ma ratios abwino kwambiri okhwima ndi kulemera ndipo amapangidwa mosavuta, koma ma coefficients awo okwera kutentha komanso makhalidwe oipa ochepetsera chinyezi amawapangitsa kukhala osayenerera kugwiritsa ntchito molondola kwambiri popanda kulipira kwambiri komanso njira zodzipatula. Zipangizo zapamwamba za ceramic zimapereka kuuma kwapadera komanso kutentha kochepa koma nthawi zambiri zimakhala zofooka komanso zokwera mtengo, zomwe zimalepheretsa kugwiritsidwa ntchito pazinthu zapadera m'malo mwa zomangamanga zonse zamakina. Zipangizo zopangidwa ndi granite, zopangidwa ndi tinthu ta miyala yachilengedwe yolumikizidwa ndi epoxy kapena resin matrices, zapezeka ngati njira zina zomwe cholinga chake ndi kuphatikiza mawonekedwe a granite yachilengedwe ndi kukhazikika bwino komanso kulemera kochepa. Ngakhale kuti zipangizozi zimapereka zabwino m'magwiritsidwe ena, zitha kuwonetsa mawonekedwe osiyanasiyana okalamba nthawi yayitali kuposa granite yachilengedwe ndipo nthawi zambiri sizingafanane ndi magwiridwe antchito a miyala yachilengedwe yolimba.

Mapangidwe osiyanasiyana a CMM amaphatikizapo kapangidwe ka granite m'njira zomwe zimakwaniritsa zofunikira zawo za kapangidwe ndi zolinga za magwiridwe antchito. Ma CMM amtundu wa mlatho, omwe ndi makonzedwe ofala kwambiri mu ntchito zowerengera za ntchito, nthawi zambiri amagwiritsa ntchito maziko a granite omwe amaphatikiza njira zoyendetsera za Y-axis ndi matebulo ogwirira ntchito akuluakulu okwanira kuti agwirizane ndi zida wamba zogwirira ntchito. Kapangidwe ka mlatho wosuntha, nthawi zambiri kamapangidwa kuchokera ku granite m'makina apamwamba, kamapereka kayendedwe ka X-axis pomwe kakuthandizira mzati wa Z-axis ndi probe. Mapangidwe awa amapindula ndi kukhazikika kwa kutentha kwa granite m'munsi wokhazikika komanso mlatho wosuntha, kuonetsetsa kuti mawonekedwe ofananira akugwirizana nthawi yonse yoyezera. Ma Gantry kapena ma portal CMM, opangidwira zida zazikulu zogwirira ntchito, nthawi zambiri amakhala ndi kapangidwe ka granite kakakulu m'mapangidwe awo apamwamba ndi mipiringidzo, komwe mawonekedwe a chinyezi cha zinthuzo amathandizira kuwongolera machitidwe osinthika a zigawo zazikulu, zomwe zingakhale zosinthika. Ma Cantilever CMM, okhala ndi mapangidwe awo ozungulira, amadalira maziko a granite ndi njira zowongolera zolondola kuti asunge kulondola ngakhale kuti cantilever ikukula zomwe zimapangitsa kuti nyumbazo zisakule kwambiri. Ma CMM opingasa, omwe amagwiritsidwa ntchito kwambiri poyang'anira thupi la magalimoto ndi kutsimikizira gulu lalikulu, amakhala ndi maziko a granite ndi mizati yomwe imapereka mawonekedwe okhazikika pomwe ikugwirizana ndi zofunikira pakuyeza kwa zida zazikulu komanso zovuta.

Mainjiniya opanga mapulani omwe amagwira ntchito ndi zigawo za granite CMM ayenera kuganizira zinthu zingapo kuti awonjezere magwiridwe antchito a makina. Kukonza kapangidwe kake kumaphatikizapo kugawa zinthu mosamala kuti ziwonjezere kulimba kwa njira zolemetsa pomwe zimachepetsa kulemera komwe sizikuthandizira magwiridwe antchito. Kapangidwe ka ribbed, ma webs amkati, ndi ma geometries opangidwa mosamala amalola opanga granite CMM kukwaniritsa kuuma kwabwino kwambiri kwa kulemera pamene akusunga zinthuzo kukhala ndi mphamvu yonyowa komanso kukhazikika. Ubale pakati pa kulemera kwa zigawo ndi kulondola kwa makina umakhala wofunikira kwambiri pakugwiritsa ntchito komwe CMM iyenera kutsatira kupanga kosuntha kapena komwe kuyika makina kumafuna kuganizira za kunyamula pansi. Kupita patsogolo mu kusanthula kwa zinthu zomaliza kwathandiza opanga kukonza ma geometries a granite ndi luso losayerekezeka, kuzindikira madera omwe zinthuzo zingachotsedwe popanda kuwononga magwiridwe antchito ndi madera omwe kulemera kowonjezera kumawongolera mawonekedwe a kutentha kapena kunyowa.

Kupanga zigawo za granite zolondola pa ntchito za CMM kumafuna luso lapadera lopangira makina ndi njira zotsimikizira khalidwe. Ntchito zopukutira za CNC, m'malo mopukutira wamba, nthawi zambiri zimapereka malo olondola omaliza pa zigawo za granite CMM, chifukwa kupukutira kumachepetsa kuwonongeka kwa pamwamba ndikupanga malo osalala komanso owongoka omwe amafunikira pamayendedwe ndi ma geometries ofunikira. Zida zodulira diamondi ndi zopukutira zimakhala njira yokhayo yopangira granite, chifukwa zida zodulira wamba sizingalowe mu kuuma kwa chinthucho. Magawo a makina ayenera kuyendetsedwa mosamala kuti apewe kuwonongeka kwa pansi pa nthaka komwe kungakhudze kukhazikika kwa nthawi yayitali kapena kapangidwe ka pamwamba komwe kungasokoneze kuyera kapena mawonekedwe a gawo lomalizidwa. Chitsimikizo cha khalidwe la zigawo za granite CMM chimaphatikizapo metrology yogwirizana kuti itsimikizire kulondola kwa miyeso, muyeso wa interferometric kuti ukhazikitse kusalala ndi kulunjika kwa malo ofunikira, ndikuwunika kutentha kuti zitsimikizire kuti zigawo zafika pamlingo woyenera musanayang'ane komaliza. Opanga ena amagwiritsa ntchito zigawo zofunika kwambiri kuti ziume nthawi yayitali kuti ziwotchedwe kutentha kuti zifulumizitse zotsatira zazing'ono zokalamba, kuonetsetsa kukhazikika kwa miyeso zisanalowe mu msonkhano.

Poganizira za chitukuko chamtsogolo, udindo wa granite pakupanga CMM ukupitirirabe kusintha pamene opanga akufufuza ntchito zatsopano ndi mitundu yosiyanasiyana ya zinthu. Zipangizo zopangidwa ndi granite, zomwe zimaphatikizapo tinthu ta granite zachilengedwe mu matrix a polima, zimapereka ubwino wochepa kulemera ndi kusinthasintha bwino pamene zikusunga zinthu zambiri zabwino za miyala yachilengedwe. Zipangizozi zitha kulola zigawo zazikulu za CMM zomwe sizingakhale zothandiza ndi granite yolimba chifukwa cha zolemetsa zolemera, zomwe zingawonjezere kuchuluka kwa ntchito za makina opangidwa ndi granite. Kafukufuku wokhudza mankhwala a pamwamba ndi njira zolumikizirana angawonjezere kwambiri makhalidwe abwino a granite, kusintha makhalidwe a kunyowa kapena kulola makonzedwe atsopano olumikizirana omwe amakulitsa magwiridwe antchito a kapangidwe kake. Pamene zofunikira pakuyeza zikupitirirabe kulimba m'magawo apamwamba opanga zinthu, makhalidwe ofunikira omwe apangitsa granite kukhala yofunika kwambiri pakuwunika molondola adzaonetsetsa kuti ikupitilizabe kufunika kwake pakupanga ndi kumanga kwa CMM.

Kupezeka kwa granite wachilengedwe nthawi zonse pomanga makina oyezera zinthu motsatira malamulo kumasonyeza zambiri kuposa mwambo kapena mwambo; kumayimira chisankho chabwino kwambiri cha zinthu zomwe zimakwaniritsa zofunikira zoyezera molondola. Mumakampani omwe amadziwika ndi kusintha kwaukadaulo mwachangu komanso kusintha kosalekeza, granite yadziwonetsa ngati chinthu chomwe chimapereka zomwe ntchito zoyezera zimafuna. Kuphatikiza kwake kukhazikika kwa kutentha, kutsika kwa kugwedezeka, kulondola kwa nthawi yayitali, komanso kukana dzimbiri kumapereka maziko omwe magwiridwe antchito amakono a CMM amadalira. Pamene kulolerana kwa opanga kukupitilirabe kulimba m'magawo onse, granite wachilengedwe udzakhalabe wofunikira pakufunafuna chidaliro choyezera, kupereka mawonekedwe okhazikika komanso odalirika omwe mainjiniya ndi akatswiri abwino amadalira kuti atsimikizire kuti zinthu zawo zikukwaniritsa zofunikira zomwe zimafotokoza luso lamakono lopanga zinthu. Zinthu zomwe zitukuko zakale zinkagwiritsa ntchito pomanga zipilala zomwe zinkayenera kukhala zaka zikwizikwi tsopano zimathandiza kuyeza kolondola komwe kumafotokoza khalidwe lopanga la m'zaka za zana la 21.

Kwa magulu a mainjiniya omwe amafotokoza machitidwe atsopano a CMM komanso opanga omwe akhazikitsa luso la metrology, kumvetsetsa udindo wa granite pakupanga makina kumapereka maziko ofunikira pakusankha ndi kugwiritsa ntchito zida. Ndalama zomwe zagwiritsidwa ntchito mu makina olondola opangidwa ndi granite zimasonyeza kumvetsetsa kuti chidaliro choyezera chimayamba ndi umphumphu wa kapangidwe kake, ndipo kuti maziko omwe muyeso umapangidwapo akuyenera kuyang'aniridwa mofanana ndi ubwino ndi kulondola kwa zigawo zomwe zikuyesedwa. Oyang'anira ubwino ayenera kuzindikira kuti maziko ndi kapangidwe ka granite zimayimira gawo lalikulu la mtengo wonse wa makinawo, koma zomwe zimapereka phindu lopitilira kwa zaka makumi ambiri zautumiki wodalirika popanda kuwonongeka kwa magwiridwe antchito. Ma CMM ambiri amakhalabe muutumiki wopanga kwa zaka makumi awiri kapena kuposerapo, ndipo zigawo za granite zomwe zinali zolondola pamene makinawo adayikidwa koyamba nthawi zambiri zimakhala zolondola masiku ano, kusonyeza phindu lapadera lomwe granite yachilengedwe imapereka mu ntchito zolondola za metrology.

Akatswiri a Metrology omwe amayesa njira za CMM sayenera kungoganizira za kulondola koyambirira kokha komanso kukhazikika kwa nthawi yayitali ndi zofunikira pautumiki zomwe zingakhudze mtengo wonse wa umwini. Makina omangidwa ndi zipangizo zina angapereke ubwino pa mtengo woyamba kapena kulemera kwa kutumiza, koma zofunikira zomwe zikupitilira pakulipira chilengedwe, kukonzanso nthawi ndi nthawi chifukwa cha kukalamba kwa zinthu, komanso nkhawa zomwe zingachitike pankhani ya kukhazikika kwa nthawi yayitali ziyenera kuganizira chisankho chogula. Makina olipira kutentha omwe amafunikira ndi makina opangidwa ndi aluminiyamu, mwachitsanzo, amawonjezera zovuta komanso zofunikira pakuwerengera zomwe sizikufunika m'malo ena opangidwa ndi granite. Mofananamo, makina ogwiritsa ntchito zinthu zopangidwa ndi polymer angafunike kuwunika nthawi ndi nthawi kuti atsimikizire kuti zotsatira za ukalamba sizinasokoneze kukhazikika kwa kapangidwe kake.

Kupatula pa mfundo zaukadaulo, kusankha ma CMM okhala ndi granite nthawi zambiri kumawonetsa mfundo za bungwe pankhani ya ubwino ndi kulondola. Makampani omwe amatchula zida zoyezera za granite amauza makasitomala awo ndi mabungwe olamulira kuti khalidwe la magawo limatengedwa mozama m'bungwe lonse. Mawonekedwe olondola komanso omveka bwino a ma CMM a granite amalimbitsa uthengawu, ndikupanga chidaliro mu luso loyezera lomwe limafalikira mu unyolo wonse wopereka. M'mafakitale komwe kusatsimikizika kwa muyeso kuyenera kulembedwa ndi kulamulidwa, monga ndege, kupanga zida zamankhwala, ndi zigawo zachitetezo zamagalimoto, kukhazikika kwa kapangidwe ka granite kumapangitsa kuti pakhale kuwonetsa kwa mphamvu ya makina oyezera yomwe kutsatira malamulo kumafuna.

Tsogolo la granite mu metrology yolondola limapitirira ntchito zachikhalidwe za CMM. Ukadaulo watsopano mu kupanga zowonjezera, makina ang'onoang'ono, ndi kupanga ma semiconductor ukupanga zofunikira zatsopano zotsimikizira magawo zomwe zidzakankhira kulekerera kwa muyeso kufika pamlingo womwe sunaganizidwepo kale. Nthawi yomweyo, kuphatikiza kwa CMM ndi njira zopangira, kudzera mu muyeso wa mkati mwa ndondomeko ndi machitidwe owongolera khalidwe nthawi yeniyeni, kuyika zofunikira zatsopano pa kukhazikika kwa makina ndi kulimba kwa chilengedwe. Granite yachilengedwe, yokhala ndi kuphatikiza kwake kotsimikizika kwa katundu, ili pamalo abwino kuti ikwaniritse zovuta izi, kupereka maziko olimba omwe mbadwo wotsatira wa machitidwe oyesera molondola udzafuna. Pamene kupanga kukupitilizabe kusinthika kwake kupita ku kulondola kwakukulu, kulekerera kolimba, ndi zofunikira kwambiri pamtundu, granite yachilengedwe idzakhalabe chinthu chofunikira kwa iwo omwe akumvetsa kuti chidaliro cha muyeso chimayamba ndi luso la kapangidwe kake.

Nkhani yodabwitsa ya granite yachilengedwe mu njira yowerengera molondola ikuwonetsa chowonadi chachikulu chokhudza zipangizo zauinjiniya: chisankho chabwino nthawi zonse sichimakhala chatsopano kapena chachilendo kwambiri, koma ndi zinthu zomwe zimagwira bwino ntchito zofunikira pakugwiritsa ntchito. Pankhani ya makina oyezera ogwirizana, granite imapereka kuphatikiza kwa zinthu zomwe muyeso wolondola umafuna, zomwe zimaperekedwa mu mawonekedwe omwe angapangidwe molondola kwambiri ndipo zidzasunga kulondola kumeneko kwa mibadwo yambiri yogwiritsidwa ntchito. Kuphatikiza uku kwa magwiridwe antchito mwachangu komanso kukhazikika kwa nthawi yayitali kwateteza malo a granite pakati pa njira yowerengera molondola, ndipo malo amenewo adzapitirirabe pamene ukadaulo woyezera ukupitilira kupita patsogolo ku ntchito zovuta kwambiri.