# 4462 – CMM Lab 1

Objectives:

• Familiarize students with the the purpose and function of a CMM machine
• Develop an understanding of how CMMs define point geometry
• Reinforce spatial visualization skills
• Introduce students to the Dimensional Measuring Interface Specification (DMIS) language
• Introduce students to PC-DMIS software

Procedure:

1. Power up PC
2. Power up CMM
3. Make sure the E-stop is out by twisting it gently.
4. Start the servos by pressing the “Enable Servos” button.
• Hold it down until you hear the a “click.”
5. Be sure your tool stack looks like the photo below and the probe points straight down.

If it does not, SEE YOUR INSTRUCTOR.
6.  Start PC-DMIS.
• You will need to click “yes” at the dialog box that appears.
7. Start a new program.
• Be aware that PC-DMIS defaults to opening an existing file.  Cancel this dialog box.
• Select INCH units.
8. Select “Lab1 Probe”
9. Click OK to home the machine
10. Jog the machine by holding either “T” button on the pendant while jogging the joystick.
• USE “TURTLE MODE” when within 3″ of the part.
11. Ensure that the part is set up as shown here:
12. Enable the “Measured Features” toolbar.
13. Select “Guess Mode.”
14. Probe a single point on one of the flat ends of the cylinder.
15. Press “ENTER” on the teach pendant.
• You should hear a chime.
• A point entity should appear in the DMIS program.
16. Move the probe to the other end and probe another point there.
17. Now probe a series of 5 points on one end as shown:

• If guess mode creates an entity other than a plane, delete all the points (and the entity) and re-probe.
18. Modify the view to show that the two points lie on the two planes.
19. Insert a distance dimension to find the distance between the two planes.
1. The distance should be 3D
2. The nominal value is .75
3. The + tolerance is 0.001 and the minus is 0.001