CNC Workholding and Fixturing 2

Question 1

What is the function of a toe clamp in CNC fixturing?

Accepted Answer

To hold the workpiece from above by stepping over its edge

Answer

To clamp the workpiece from the side using a cam mechanism

Answer

To anchor the fixture plate to the machine table

Answer

To locate a round workpiece against a V-block

Question 2

Which type of chuck jaw is used when machining a second operation (Op 2) that must be centered on a previously machined bore?

Accepted Answer

Soft bored jaws

Answer

Hard raw jaws

Answer

Step jaws

Answer

Pie jaws

Question 3

What is a major advantage of using a zero-point clamping system in CNC machining?

Accepted Answer

Allows sub-minute workpiece changes with pre-set repeatability

Answer

Eliminates the need for coolant during setup

Answer

Reduces spindle speed requirements for heavy cuts

Answer

Enables cutting without G-code offsets

Question 4

When clamping a thin, flat workpiece on a CNC mill table, why is vacuum fixturing preferred?

Accepted Answer

It holds the part without deforming it and keeps the top surface clear

Answer

It provides higher clamping force than mechanical clamps

Answer

It works equally well on all materials including non-ferrous metals

Answer

It eliminates the need for work coordinate offsets

Question 5

In CNC turning, why is it critical that the cutting tool is set exactly at center height?

Accepted Answer

To prevent rubbing on the tool flank and ensure correct cutting geometry

Answer

To match the programmed RPM with the correct SFM

Answer

To allow the coolant to flow over the tool correctly

Answer

To align with the chuck jaw reference marks

Question 6

What is the purpose of using strap clamps with step blocks in CNC milling setups?

Accepted Answer

To apply downward clamping force to odd-shaped or large workpieces

Answer

To create a reference surface for probing

Answer

To set the tool length offset automatically

Answer

To prevent coolant from entering the T-slots