Zida zamkati zamtundu woterezi nthawi zambiri zimafunikira kusinthidwa kwa mbiri yake ndipo kulondola kwake ndi ISO6-7, tisanatumize chilichonse, tidzapereka malipoti awa kwa kasitomala kuti awone zambiri za zida za helical kuti atsimikizire kuti zonse zikumveka bwino komanso zabwino kutumiza.
1) Kujambula kwa bubble
2)Dlipoti la imension
3)Hidyani mankhwala lipoti musanayambe kutentha
4)HIdyani lipoti la chithandizo mukatha kutentha
5)Mlipoti lamlengalenga
6)Alipoti lolondola
7)Pzithunzi ndi makanema onse oyesera monga runout, Cylindricity etc
8) Malipoti ena oyesera malinga ndi zomwe makasitomala amafuna monga lipoti lozindikira zolakwika