Awọn ohun elo ti awọn lu aarin le ti wa ni pin si ga-iyara irin, cemented carbide, amọ ati polycrystalline Diamond.Lara wọn, irin giga-giga jẹ ohun elo ti a lo nigbagbogbo pẹlu iṣẹ ṣiṣe idiyele giga;cemented carbide ni o ni ti o dara yiya resistance ati líle, ati ki o jẹ o dara fun processing ohun elo pẹlu jo ga líle;lu ile-iṣẹ seramiki ni o ni resistance otutu giga ti o dara ati ki o wọ resistance, ṣugbọn sisẹ ṣiṣe naa jẹ kekere;lilu ile-iṣẹ diamond polycrystalline ni lile-giga giga ati resistance resistance, ati pe o dara fun sisẹ awọn ohun elo lile-giga.Nigbati o ba yan ohun elo liluho aarin, o yẹ ki o yan ni ibamu si lile ti ohun elo iṣẹ ati awọn ipo sisẹ.Ni gbogbogbo, fun awọn ohun elo irin ti o le, o le yan awọn ohun elo ti o le, gẹgẹbi awọn carbide cemented, polycrystalline diamond, bbl;fun awọn ohun elo ti o rọra, o le yan irin-giga-giga tabi awọn ohun elo amọ.Ni afikun, o tun jẹ dandan lati san ifojusi si awọn ifosiwewe bii iwọn ati didara dada ti lilu ile-iṣẹ lati rii daju ipa iṣiṣẹ ati iṣedede sisẹ.Nigbati o ba nlo liluho aarin, akiyesi yẹ ki o san si sisẹ lubrication ati awọn ipo itutu agbaiye lati yago fun wiwọ ọpa ati didara dada ti o dinku nitori sisẹ pupọ.Ni akoko kanna, a tun gbọdọ san ifojusi si aabo lakoko sisẹ lati yago fun aisedeede iṣẹ tabi awọn ijamba sisẹ ti o fa nipasẹ iṣedede iṣelọpọ kekere.