CNC Work Holding & Fixturing 2

Question 1

What is the primary advantage of a hydraulic vise over a standard mechanical vise in CNC machining?

Accepted Answer

Consistent and repeatable clamping force

Answer

Hydraulic vises apply consistent, repeatable clamping force that reduces part-to-part variation and operator error.

Question 2

A sine bar is used in fixturing primarily to:

Accepted Answer

Set precise angular orientations of a workpiece

Answer

A sine bar uses precision gauge blocks and trigonometry to set exact angular positions for workpieces during machining or inspection.

Question 3

Which clamping method is most appropriate when a workpiece must be machined on all four vertical sides without re-fixturing?

Accepted Answer

A tombstone fixture on a horizontal machining center

Answer

A tombstone fixture mounted on a horizontal machining center allows B-axis indexing to access multiple faces in one setup.

Question 4

What does 'pull stud' retention refer to in CNC toolholding?

Accepted Answer

The mechanism that draws and locks the toolholder into the spindle taper

Answer

A pull stud (retention knob) is threaded into the toolholder shank and is gripped by the spindle drawbar to secure the toolholder in the machine spindle.

Question 5

When using parallels in a vise, their purpose is to:

Accepted Answer

Elevate the workpiece so it sits above the vise jaws for full feature access

Answer

Parallels raise the workpiece above the vise jaw top surface, exposing more of the part and allowing the cutter to clear the jaws.

(CNC) Computer Numerical Control Machinist Technical Practice Test

(CNC) Computer Numerical Control Machinist Technical Practice Test

CNC Work Holding & Fixturing 2