Screw Compressor Ro-tor
Training manual
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
Contents
3
1. 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
X
Y
X
Z
X
Z
X
Y
Female Male
4
2. Probe setup 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)
TIP1
TIP2
TIP3
TIP4
TIP5
TIP1
TIP2
TIP3
TIP4
X
Y
X
Y
Teeth = 5
Teeth = 4
5
3. Import nominal profile data 1) Import nominal profile from a text file. (X,Y Data)
X Y
Import text file
Name of Profile
6
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!
7
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.
8
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!
9
Female Pro-file
Male Profile
10
4. Create helical vector
Length of Lead per pitch
Helix direc-tion
Probe radius compensa-tion(Generally ‘0’)
Probe R comp direc-tion
※ In case imported nominal profile from a 3D CAD model, there might be ni need of create he-lical vector.
11
Eventually show the vectors, to ensure yourself, they are created correctly.
12
5. File structure
C: \ CurveAnalyzer \ Scr-comp \
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
13
6. Screw compressor rotor’s function. CurveAnalyzer menu
Measure -> Screw compressor rotors…
Create PC-DMIS Part pro-gram
Execute part program & eval-uate
List of Part data files
Profile view (top face of S/C ro-tor)
Summary view part data
Evaluate current measure-ment
Create new part
Edit selected part
Delete selected part
Create copy of the current part
Manage backup – recall/delete
Setup measuring and evalu-ation parameters
14
7. Define Screw compressor rotor’s data. CurveAnalyzer menu
Measure -> Screw compressor rotors… -> New
15
7. Define Screw compressor rotor’s data 1) Define generally geometry data - Female
Part’s ID or Name
Select nominal pro-file
Tooth width of S/C ro-tor(Z axis direction)
Length of lead
Choose two points of the nomi-nal profile for set the rotate axis
16
7. Define Screw compressor rotor’s data 1) Define generally geometry data - Male
Part’s ID or Name
Select nominal pro-file
Tooth width of S/C ro-tor(Z axis direction)
Length of lead
Choose two points of the nomi-nal profile for set the rotate axis
17
7. Define Screw compressor rotor’s data 1) Define generally geometry data – Profile view mode
Click right mouse but-ton
Section profile view
Top face full pro-file
Rotate profile
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
The highlighting is No.1 of pro-files Counter clockwise 2,3,4…
18
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 align-ment
Probe approach distance for measure-ment
Currently probe name & shape
19
7. Define Screw compressor rotor’s data 2) Measurement configuration – Probe setup
Name of probe(As in PC-DMIS!)
Stylus num-bers
Direction of No.1 tip
Diameter of stylus
If you use a index probe head.Changes in the following format.=> T1A90B-90
20
7. Define Screw compressor rotor’s data 3) Alignment setup
Auto vector pointDefined scanUnknown scan
Upper diame-ter
Lower diame-ter
Cylin
der
heig
ht
Cylin
der
heig
ht
Z P
osi
-ti
on
Z P
osi
-ti
on
Setup alignment location & range
21
7. Define Screw compressor rotor’s data 3) Profile measurement setup - Female
Profile form toler-ance
Ref. Is NominalRef. Is Measured
Profile & probe view for mea-surement height. Check if OK! Eventually change Z position!
All = Full profile mea-surement1 = No.1 profile mea-surement
Auto vector pointDefined scanUnknown scan
22
7. Define Screw compressor rotor’s data 3) Profile measurement setup - Male
Profile form toler-ance
Ref. Is NominalRef. Is Measured
All = Full profile mea-surement1 = No.1 profile mea-surement
Profile & probe view of mea-surement height
Auto vector pointDefined scanUnknown scan
23
7. Define Screw compressor rotor’s data 4) Lead measurement setup - Female
Lead total form tolerance
Lead measurement location view
All = Full lead measure-ment1 = No.1 lead measure-ment
Auto vector pointDefined scanUnknown scan
Point number of nominal pro-file for Flank 1 measurement
Same as the rotate axis points
Point number of nominal pro-file for Flank 2 measurement
Flank 1
Flank 2
24
7. Define Screw compressor rotor’s data 4) Lead measurement setup - Male
Lead total form tolerance
All = Full lead measure-ment1 = No.1 lead measure-ment
Lead measurement location view
Auto vector pointDefined scanUnknown scan
Point number of nominal pro-file for Flank 1 measurement
Point number of nominal pro-file for Flank 2 measurement
25
7. Define Screw compressor rotor’s data 4) Lead measurement setup – Graphic display mode
Radial PositionFlank 1 TipsFlank 2 Tips
Scanning rage view of Flank 1
Adjust scanning range of Flank 1Default = 0
Scanning rage view of Flank 2
Adjust scanning range of Flank 2Default = 0
26
7. Define Screw compressor rotor’s data 5) Pitch measurement setup
27
8. Create PC-DMIS part program. 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 buttonExecuted PC-DMIS.
28
9. Execute part program & evaluate dimension . CurveAnalyzer menu
Measure -> Screw compressor rotors… -> Measure & Evaluate
Part information & com-ment
29
9. Execute part program & evaluate dimension. PreAlignment – Manual measuring
1. Top face, 3point probing. (use Tip1)
※In the case of first-run part program, set slow speed of Jog-box.
2. Outer diameter of top face, 3point probing. (use Tip1)
30
10. Report analysis Female – Individual Profile & Lead Error
Profile form er-ror
Lead form error
Lead total form er-ror
Lead slope er-ror
Lead evalu-ate location
Lead length error
Profile evaluate loca-tion
31
10. Report analysis . Female – Full Profile , Lead , Pitch Error
Profile form error
Total form error of a lead
RUNOUT of Ext diaRUNOUT of Int dia
Average lead length of total Flank1
Total form error of full leads
Individual Pitch er-rorAdjacent Pitch er-ror
Cummulative Pitch er-ror
32
10. Report analysis . Female – Full Profile Error
Profile Total form error
RUNOUT of Ext diaRUNOUT of Int dia
Profile + dir form errorProfile - dir form error
Profile - dir out of toler-ance
Profile + dir out of toler-ance
33
10. Report analysis . Female – Full Lead Error
Lead form error
Lead slope error
Lead total form er-ror
Lead length error
34
10. Report analysis . Male - Report