It's the part of the drill that holds the drill bit.
Tighten the drill bit in the chuck.
chuck
A 'chuck key ' is used, there are 2-3 sizes.
a jt3 chuck is a chuck for a drill that takes a jt3 tapered arbour for fitting into lathes or pillar bench drills
The drill chuck
"chuck"
A three jaw chuck is usual.
Normally with a chuck key.
There are two types of chuck. One clamps up by hand, twisting holder against chuck base. Others have a serrated edge and need a chuck key.
Chuck
Drill presses usually have a conical chuck mount. That slot is there to allow you to insert a wedge above the chuck to knock the chuck out should you need to.
Drill presses usually have a conical chuck mount. That slot is there to allow you to insert a wedge above the chuck to knock the chuck out should you need to.