Ib lub tuam txhab tsim khoom siv mining zoo tshaj plaws tuaj xyuas peb uas tab tom nrhiav kev daws teeb meem rau cov khoom lojcov iav miningLawv tau tiv tauj ntau tus neeg muag khoom ua ntej lawv tuaj, tab sis lawv tsis tau txais cov lus tawm tswv yim zoo vim yog qhov ntim kev loj hlob.

Thaum lawv tuaj, peb qhia lawv tsis yog peb lub peev xwm cylindrical gears xwb tab sis kuj muaj peev xwm bevel gear, lawv zoo siab thiab zoo siab heev.

Tus thawj coj yuav khoom James tau cog lus tias yuav muaj kev sib txuas lus tob rau txhua tus ntawm lawv cov iav nplhaibthiab cov haujlwm bevel iav.