0. Screw Compressor Rotor
Training manual

1. Contents 1. Part position ... ..………………………………………………… 2
2. Probe setup …………………………………………………… 3
3. Import nominal profile data……………………………………… 4
4. Create helical vector …………………………………………… 9
5. File structure …………………………………………………… 11
6. Screw compressor rotor‘s function ………………………… 12
7. Define Screw compressor rotor’s data ……………………… 13
8. Create PC-DMIS part program ……………………………… 26
9. Execute part program & evaluate dimension ……………… 27
10. Report analysis ……………………………………………… 29

2. X Y X Y X Z X Z Part position on the CMM Table
– Rotation axis of the Screw Compressor= Z axis of the CMM.
- Part rotation – any, prefferably use some references, like pictures bellow
Female
Male X Y X Y X Z X Z

3. Teeth = 5 Teeth = 4 2. Probe setup TIP5 TIP4 TIP1 TIP3 X Y TIP2 TIP4
Stylus number is configured the same as the number of teeth of the part.
Stylus No.1 = -X axis direction (not a must, but a good suggestion – see pictures bellow)
Teeth = 5
TIP5
TIP4
TIP1
TIP3 X Y
TIP2
Teeth = 4
TIP4
TIP1
TIP3 X Y
TIP2

4. X Y 3. Import nominal profile data Import text file Name of Profile
1) Import nominal profile from a text file. (X,Y Data) X Y
Import text file
Name of Profile

5. 3. Import nominal profile data
2.1) Import nominal profile from a 3D CAD model
After you import the 3D CAD model from PC-DMIS using Linear_Open_Scan, generate an off-line scan to extract nominal profile. Create the scan in CCW direction!

6. 3. Import nominal profile data
2.2) Import nominal profile from a 3D CAD model
Start CA and import the nominal profile generated in PC-DMIS.

7. 3. Import nominal profile data
3) Adjust the data
Change the Z value of the points to “0”. Check again the point flow – must be CCW!

8. Female Profile
Male Profile

9. 4. Create helical vector
※ In case imported nominal profile from a 3D CAD model, there might be ni need of create helical vector.
Length of Lead per pitch
Helix direction
Probe radius compensation
(Generally ‘0’)
Probe R comp direction

10. Eventually show the vectors, to ensure yourself, they are created correctly.

11. C:＼CurveAnalyzer＼Scrcomp＼
5. File structure
C:＼CurveAnalyzer＼Scrcomp＼
S/C rotor part data(spec) file
PC-DMIS Part program file
CurveAnalyzer Measured data file
C:＼CurveAnalyzer ＼Scrcomp ＼”Name of S/C rotor part data”_Saved＼
Backup files of CurveAnalyzer Measured data file
※ C/A Measured file name + date & time
Backup folder of CurveAnalyzer Measured data files
CurveAnalyzer Measured data files
PC-DMIS Part program files
S/C rotor part data files

12. 6. Screw compressor rotor’s function
. CurveAnalyzer menu
Measure -> Screw compressor rotors…
Profile view (top face of S/C rotor)
Evaluate current measurement
Create new part
Edit selected part
Delete selected part
List of Part data files
Create copy of the current part
Summary view part data
Manage backup – recall/delete
Create PC-DMIS Part program
Setup measuring and evaluation parameters
Execute part program & evaluate

13. 7. Define Screw compressor rotor’s data
. CurveAnalyzer menu
Measure -> Screw compressor rotors… -> New

14. 7. Define Screw compressor rotor’s data
1) Define generally geometry data - Female
Part’s ID or Name
Select nominal profile
Tooth width of S/C rotor
(Z axis direction)
Length of lead
Choose two points of the nominal profile for set the rotate axis

15. 7. Define Screw compressor rotor’s data
1) Define generally geometry data - Male
Part’s ID or Name
Select nominal profile
Tooth width of S/C rotor
(Z axis direction)
Length of lead
Choose two points of the nominal profile for set the rotate axis

16. 7. Define Screw compressor rotor’s data
1) Define generally geometry data – Profile view mode
Click right mouse button
Section profile view
Top face full profile
Rotate profile
The highlighting is No.1 of profiles Counter clockwise 2,3,4…
Adjust the top face of the actual part, as it will be placed on the CMM, and the like, click left mouse button.
※ ㅣ= Lead

17. Currently probe name & shape
7. Define Screw compressor rotor’s data
2) Measurement configuration
Safety distance of part around
Z axis safety height from top face
Probe approach distance for alignment
Probe approach distance for measurement
Currently probe name & shape

18. 7. Define Screw compressor rotor’s data
2) Measurement configuration – Probe setup
If you use a index probe head.
Changes in the following format.
=> T1A90B-90
Name of probe
(As in PC-DMIS!)
Stylus numbers
Direction of No.1 tip
Diameter of stylus

19. 7. Define Screw compressor rotor’s data
3) Alignment setup
Auto vector point
Defined scan
Unknown scan
Setup alignment location & range
Upper diameter
Lower diameter
Cylinder height
Z Position

20. 7. Define Screw compressor rotor’s data
3) Profile measurement setup - Female
All = Full profile measurement
1 = No.1 profile measurement
Profile form tolerance
Ref. Is Nominal
Ref. Is Measured
Auto vector point
Defined scan
Unknown scan
Profile & probe view for measurement height. Check if OK! Eventually change Z position!

21. 7. Define Screw compressor rotor’s data
3) Profile measurement setup - Male
All = Full profile measurement
1 = No.1 profile measurement
Profile form tolerance
Ref. Is Nominal
Ref. Is Measured
Auto vector point
Defined scan
Unknown scan
Profile & probe view of measurement height

22. 7. Define Screw compressor rotor’s data
4) Lead measurement setup - Female
All = Full lead measurement
1 = No.1 lead measurement
Lead total form tolerance
Auto vector point
Defined scan
Unknown scan
Flank 1
Same as the rotate axis points
Flank 2
Point number of nominal profile for Flank 1 measurement
Lead measurement location view
Point number of nominal profile for Flank 2 measurement

23. 7. Define Screw compressor rotor’s data
4) Lead measurement setup - Male
All = Full lead measurement
1 = No.1 lead measurement
Lead total form tolerance
Auto vector point
Defined scan
Unknown scan
Point number of nominal profile for Flank 1 measurement
Lead measurement location view
Point number of nominal profile for Flank 2 measurement

24. 7. Define Screw compressor rotor’s data
4) Lead measurement setup – Graphic display mode
Radial Position
Flank 1 Tips
Flank 2 Tips
Scanning rage view of Flank 1
Adjust scanning range of Flank 1
Default = 0
Scanning rage view of Flank 2
Adjust scanning range of Flank 2
Default = 0

25. 7. Define Screw compressor rotor’s data
5) Pitch measurement setup

26. ※ 8. Create PC-DMIS part program Before click PC-DMIS PP button
. CurveAnalyzer menu
Keep PC-DMIS opened, but with no PP opened. Then : Measure -> Screw compressor rotors… -> Generate PC-DMIS PP ※
Before click PC-DMIS PP button
Executed PC-DMIS.

27. Part information & comment
9. Execute part program & evaluate dimension
. CurveAnalyzer menu
Measure -> Screw compressor rotors… -> Measure & Evaluate
Part information & comment

28. 1. Top face, 3point probing. (use Tip1)
9. Execute part program & evaluate dimension
. PreAlignment – Manual measuring
1. Top face, 3point probing. (use Tip1)
2. Outer diameter of top face, 3point probing. (use Tip1) ※
In the case of first-run part program, set slow speed of Jogbox.

29. 10. Report analysis Female – Individual Profile & Lead Error
Profile evaluate location
Profile form error
Lead length error
Lead evaluate location
Lead slope error
Lead form error
Lead total form error

30. 10. Report analysis . Female – Full Profile , Lead , Pitch Error
RUNOUT of Ext dia
Profile form error
RUNOUT of Int dia
Total form error of full leads
Average lead length of total Flank1
Total form error of a lead
Individual Pitch error
Adjacent Pitch error
Cummulative Pitch error

31. 10. Report analysis . Female – Full Profile Error
Profile Total form error
Profile － dir form error
Profile ＋ dir form error
Profile ＋ dir out of tolerance
Profile － dir out of tolerance
RUNOUT of Ext dia
RUNOUT of Int dia

32. 10. Report analysis . Female – Full Lead Error Lead total form error
Lead form error
Lead slope error
Lead length error

33. 10. Report analysis
Male - Report