Sisitemu ya BTA (Boring & Trepanning Association) yatunganijwe ahanini nitsinda mpuzamahanga ryabakora ibikoresho.Sisitemu yari imwe muri sisitemu ya mbere yatsindiye ibikoresho byo gukuramo chip imbere, kandi ikubiyemo gucukura, kurambirana, no gukandagira umutwe kandi bifatwa nka sisitemu nziza mu gukora umwobo ukoresha ibikoresho bikonjesha cyane.
Muri sisitemu ya BTA yo gukora umwobo, amazi munsi yigitutu atemba yerekeza kumurongo hejuru ya OD yumurongo urambiranye numutwe, kandi unaniza hamwe na chipi ukoresheje indangamuntu yumurongo urambiranye.Amazi meza yungurujwe atemba ahora hejuru yumutwe, bityo ugasiga amavuta yo kuyobora akora nkigikoresho cyo gutwika kugirango kirangire neza, kandi gishobora kugaburira ibiryo byinshi.Ubujyakuzimu burashobora kuboneka nka diametero 150 cyangwa zimbitse.
1. Igiciro cyiza kandi gihiganwa
2. Gutanga ibicuruzwa mugihe
Uyu mutwe wa BTA wimyitozo yemeza ibicuruzwa bitumizwa mu mahanga, bifite inyungu zo gukora neza, guhindura icyuma byoroshye, ubuzima bwa serivisi ndende, buke ukoresheje ikiguzi.Kandi irashobora gucukura ibyuma bya karubone, imbaraga nyinshi zivanze ibyuma, ibyuma bidafite ingese nibindi.neza neza umwobo wa diameter IT9-11.Ubuso bwubuso: Ra6.3-12.5