CN110132108A - A kind of support arm outer surface of pipe fittings cylindricity measurement device and measurement method - Google Patents
A kind of support arm outer surface of pipe fittings cylindricity measurement device and measurement method Download PDFInfo
- Publication number
- CN110132108A CN110132108A CN201910351163.7A CN201910351163A CN110132108A CN 110132108 A CN110132108 A CN 110132108A CN 201910351163 A CN201910351163 A CN 201910351163A CN 110132108 A CN110132108 A CN 110132108A
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- support arm
- pipe fitting
- arm pipe
- cylindricity
- pedestal
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- 238000005259 measurement Methods 0.000 title claims abstract description 40
- 238000000691 measurement method Methods 0.000 title claims abstract description 7
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000011017 operating method Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 7
- 238000013461 design Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/0002—Arrangements for supporting, fixing or guiding the measuring instrument or the object to be measured
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/20—Measuring arrangements characterised by the use of mechanical techniques for measuring contours or curvatures
- G01B5/201—Measuring arrangements characterised by the use of mechanical techniques for measuring contours or curvatures for measuring roundness
Abstract
A kind of support arm outer surface of pipe fittings cylindricity measurement device and measurement method, wherein measuring device includes upper rack posts, lower fulcrum bar, pole pedestal, sliding block, sliding rail, middle bearing piece and pedestal；The pedestal is fixed in the horizontal plane, and sliding rail is arranged on pedestal；The sliding block is at least arranged three groups, equipped with sliding rail, wherein rear set sliding block and pole pedestal fixing assembling, before one group of sliding block assembled by ball bearing assembly and support arm pipe fitting to be measured front end, intermediate one group of sliding block and middle bearing piece fixing assembling；The upper rack posts and lower fulcrum bar parallel arrangement, their rear ends and pole pedestal fixing assembling, form the U-typed frame for toppling over placement, and dial gauge is arranged in the front end of upper rack posts；The lower fulcrum bar penetrates support arm tube intracavity to be measured when measuring operation；The middle bearing piece is used to support the rear end of support arm pipe fitting to be measured.The present invention solves the problems, such as the comprehensive measurement of aircraft upper branch arm tube outer surface cylindricity, has achieved the purpose that guarantee aircraft security flight.
Description
Technical field
The present invention relates to a kind of support arm outer surface of pipe fittings cylindricity measurement device and measurement methods, belong to test, measurement skill
Art field.
Background technique
Aircraft upper branch arm pipe is important connecting elements, during aircraft manufacture and overhaul, according to related technology
It is required that need to measure support arm tube outer surface cylindricity deviation, and on this basis to support arm pipe whether be qualified product into
Row screening, to guarantee that aircraft security flies.
For the measurement problem of aircraft upper branch arm tube outer surface cylindricity deviation, using general measure tool and measurement side
Method can only measure its end, helpless for the measurement of position outer surface cylindricity among support arm pipe, it is difficult to meet
The requirement of the comprehensive measurement of support arm pipe, it is therefore desirable to which optimization design one kind is able to achieve carry out outer surface comprehensive to support arm pipe cylinder
Spend the device and method of measurement.
Summary of the invention
The present invention provides a kind of support arm outer surface of pipe fittings cylindricity measurement device and measurement method, it is intended to solve on aircraft
The problem of support arm tube outer surface cylindricity comprehensive measurement, achievees the purpose that guarantee aircraft security flight.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of support arm outer surface of pipe fittings cylindricity measurement device, including upper rack posts, lower fulcrum bar, pole pedestal, sliding block, sliding rail, middle branch
Block and pedestal；The pedestal is fixed in the horizontal plane, and sliding rail is arranged on pedestal；The sliding block is at least arranged three groups, with cunning
Rail is equipped, wherein rear set sliding block and pole pedestal fixing assembling, before one group of sliding block pass through ball bearing assembly and branch to be measured
The assembly of arm pipe fitting front end, intermediate one group of sliding block and middle bearing piece fixing assembling；The upper rack posts and lower fulcrum bar parallel arrangement, after them
End and pole pedestal fixing assembling, form the U-typed frame for toppling over placement, and dial gauge is arranged in the front end of upper rack posts；The lower branch
Bar penetrates support arm tube intracavity to be measured when measuring operation；The middle bearing piece is used to support the rear end of support arm pipe fitting to be measured.
Above-mentioned support arm outer surface of pipe fittings cylindricity measurement device, the middle bearing piece are equipped with support arm pipe fitting upper and lower position and adjust machine
The shaft with adjusting knob, locking button and eccentric bushing, the band adjusting knob is arranged in structure, support arm pipe fitting upper and lower position adjustment mechanism
Shaft tail end pass through middle bearing piece after with locking button assembly, the eccentric bushing be sleeved in a manner of fixing assembling with adjusting knob turn
On axis.
Above-mentioned support arm outer surface of pipe fittings cylindricity measurement device, the middle bearing piece are additionally provided with support sleeve；The support sleeve set
Outside eccentric bushing, V-type locating slot is set on support sleeve, and the support arm pipe fitting rear end to be measured, which is taken, is placed on support sleeve
On, the position-limiting action of support arm pipe fitting left and right directions is realized by V-type locating slot.
Above-mentioned support arm outer surface of pipe fittings cylindricity measurement device, the pedestal, which is that Open Side Down, is inverted channel steel structure, at it
Sliding rail is fixedly mounted in upper surface.
A kind of support arm outer surface of pipe fittings cylindricity measuring method realizes outer surface cylindricity side entirely using above-mentioned measuring device
The measurement of position, including following operating procedure:
A, U-typed frame is pushed and pulled, rear set sliding block is made to be moved to sliding rail rearmost end；
B, by the inner hole of the front loaded ball bearing assembly of support arm pipe fitting, support arm pipe fitting rear end is placed on the V of middle bearing piece support sleeve
In type locating slot, and support arm pipe fitting rear end upper and lower position is adjusted by support arm pipe fitting upper and lower position adjustment mechanism, makes support arm pipe fitting
In horizontal positioned state；
C, lower fulcrum bar is inserted into support arm pipe fitting rear end orifice position；
D, U-typed frame is pushed and pulled, the measuring head of dial gauge is made to be located at the left end of support arm pipe fitting；
E, the reading of dial gauge at this time is adjusted to " 0 "；
F, slowly push-and-pull U-typed frame, observation percentage meter reading variation to the right, and record percentage meter reading maximum value and minimum
Value calculates the difference of percentage meter reading maximum value and minimum value, obtains this support arm outer surface of pipe fittings cylindricity numerical value；
G, rotating support arm pipe fitting, repeat aforesaid operations step a~f, to support arm pipe fitting different direction outer surface cylindricity deviation into
Row measures several times；
H, compare measurement data several times, obtain support arm pipe fitting support arm outer surface of pipe fittings cylindricity numerical value.
Above-mentioned support arm outer surface of pipe fittings cylindricity measuring method carries out the next on support arm pipe fitting rear end in the step b
When setting adjustment, the shaft with adjusting knob is rotated, eccentric bushing is rotated with it, passes through eccentric bushing lateral wall and support arm pipe fitting contact point
Variation realize adjusting to support arm pipe fitting rear end upper and lower position, then support arm pipe is made by the ball bearing assembly of support arm pipe fitting front end
Part is adjusted to horizontal positioned state.
The present invention provides a kind of support arm outer surface of pipe fittings cylindricity measurement device, it by upper rack posts, lower fulcrum bar rear end with
Pole pedestal fixing assembling to form the U-typed frame for toppling over placement, and is provided with dial gauge in the front end of upper rack posts；The survey
Amount device is also provided with the sliding block and sliding rail that U-typed frame can be made axially to move horizontally, it is thus achieved that axial to support arm pipe fitting
The measurement of different location；The measuring device is also provided with ball bearing assembly in support arm pipe fitting front end, and is arranged in middle bearing piece
Thus support arm pipe fitting rear end upper and lower position adjustment mechanism not only ensure that support arm pipe fitting is placed in measurement process with horizontality,
And support arm pipe fitting can be made to rotate around its own axis by ball bearing assembly, it realizes to support arm pipe fitting circumferential direction different location
Measurement.
The present invention also provides a kind of support arm outer surface of pipe fittings cylindricity measuring method, the measurement method uses the survey
Measure the measurement that device completes support arm outer surface of pipe fittings cylindricity；When executing the cylindricity measurement operation of support arm outer surface of pipe fittings, first
The lower fulcrum bar of U-typed frame is penetrated into support arm tube intracavity to be measured, pushes and pulls U-typed frame to the left, makes dial indicator measuring head and branch
The contact of arm pipe fitting front end outer wall percentage meter reading will return to zero at this time, then slowly push-and-pull U-typed frame, record percentage meter reading become
Change, calculates the difference of percentage meter reading maximum value and minimum value, obtain this support arm outer surface of pipe fittings cylindricity numerical value, then revolve
Turn support arm pipe fitting certain angle, the measurement of support arm outer surface of pipe fittings cylindricity at different location can be carried out, this makes it possible to obtain full sides
The support arm outer surface of pipe fittings cylindricity numerical value of position.
In conclusion the present invention solves the problems, such as the comprehensive measurement of aircraft upper branch arm tube outer surface cylindricity, reach
Guarantee the purpose of aircraft security flight.
Detailed description of the invention
Fig. 1 is support arm outer surface of pipe fittings cylindricity measurement apparatus structure schematic diagram of the present invention；
Fig. 2 is A-A the schematic diagram of the section structure in Fig. 1；
Fig. 3 is B-B the schematic diagram of the section structure in Fig. 1；
Fig. 4 is C-C the schematic diagram of the section structure in Fig. 1；
Fig. 5 is schematic enlarged-scale view at I in Fig. 1；
Fig. 6 is D-D the schematic diagram of the section structure in Fig. 5；
Fig. 7 is support arm outer surface of pipe fittings cylindricity measurement schematic diagram；
Fig. 8 is support arm pipe fitting upper and lower position adjustment mechanism course of work schematic diagram in middle bearing piece.
Each list of reference numerals in figure are as follows:
1, pole pedestal, 2, upper rack posts, 3, lower fulcrum bar, 4, middle bearing piece, 4-1, the shaft with adjusting knob, 4-2, eccentric bushing, 4-3,
Support sleeve, 4-4, locking button, 5, support arm pipe fitting, 6, sliding rail, 7, pedestal, 8, dial gauge, 8-1, measuring head, 9, ball bearing assembly,
10, sliding block.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the invention will be further described.
Referring to Fig. 1, Fig. 2, Fig. 3, Fig. 4, support arm outer surface of pipe fittings cylindricity measurement device of the present invention includes upper branch
Bar 2, lower fulcrum bar 3, pole pedestal 1, sliding block 10, sliding rail 6, middle bearing piece 4 and pedestal 7；The pedestal 7 is fixed in the horizontal plane, pedestal 7
It is inverted channel steel structure for Open Side Down, sliding rail 6 is fixedly mounted in end face on it；The sliding block 10 is arranged three groups, matches with sliding rail 6
Dress, wherein rear set sliding block and 1 fixing assembling of pole pedestal, before one group of sliding block pass through ball bearing assembly 9 and support arm to be measured
Pipe fitting 5 assembles, intermediate one group of sliding block and middle 4 fixing assembling of bearing piece；The upper rack posts 2 and lower fulcrum bar 3 are arranged in parallel, their rear ends
With 1 fixing assembling of pole pedestal, the U-typed frame for toppling over placement is formed, dial gauge 8 is set in the front end of upper rack posts 2；The lower branch
Bar 3 penetrates 5 inner cavity of support arm pipe fitting to be measured when measuring operation；After the middle bearing piece 4 is used to support support arm pipe fitting 5 to be measured
End.
Referring to Fig. 1, Fig. 5, Fig. 6, support arm outer surface of pipe fittings cylindricity measurement device of the present invention, wherein bearing piece 4 is set
Have a support arm pipe fitting upper and lower position adjustment mechanism, support arm pipe fitting upper and lower position adjustment mechanism be arranged the shaft 4-1 with adjusting knob,
Lock button 4-4, eccentric bushing 4-2 and support sleeve 4-3, the shaft 4-1 tail end with adjusting knob pass through after middle bearing piece 4 with locking button
4-4 assembly, the eccentric bushing 4-2 are sleeved on the shaft 4-1 with adjusting knob in a manner of fixing assembling；The support sleeve 4-3 set
Outside eccentric bushing 4-2, V-type locating slot is set on support sleeve 4-3, and 5 rear end of support arm pipe fitting to be measured, which is taken, to be placed on
On support sleeve 4-3, the position-limiting action of 5 left and right directions of support arm pipe fitting is realized by V-type locating slot.
Referring to Fig. 7, Fig. 8, support arm outer surface of pipe fittings cylindricity measuring method of the present invention, using above-mentioned measuring device
Realize the comprehensive measurement of outer surface cylindricity, including following operating procedure:
A, U-typed frame is pushed and pulled, rear set sliding block is made to be moved to 6 rearmost end of sliding rail；
B, by the inner hole of the front loaded ball bearing assembly of support arm pipe fitting 5,5 rear end of support arm pipe fitting is placed on middle 4 support sleeve of bearing piece
In the V-type locating slot of 4-3, and 5 rear end upper and lower position of support arm pipe fitting is adjusted by support arm pipe fitting upper and lower position adjustment mechanism, makes to prop up
Arm pipe fitting 5 is in that horizontal positioned state rotates the shaft 4-1 with adjusting knob when carrying out the adjustment of 5 rear end upper and lower position of support arm pipe fitting,
Eccentric bushing 4-2 is rotated with it, is realized by the variation of eccentric bushing 4-2 lateral wall and support arm pipe fitting contact point to support arm pipe fitting 5
The adjusting of rear end upper and lower position, then support arm pipe fitting 5 is adjusted to horizontal positioned by the ball bearing assembly 9 of 5 front end of support arm pipe fitting
State；
C, lower fulcrum bar 3 is inserted into 5 rear end orifice position of support arm pipe fitting；
D, U-typed frame is pushed and pulled, the measuring head of dial gauge 8 is made to be located at the left end of support arm pipe fitting 5；
E, the reading of dial gauge 8 at this time is adjusted to " 0 "；
F, slowly push-and-pull U-typed frame, observation percentage meter reading variation to the right, and record percentage meter reading maximum value and minimum
Value calculates the difference of percentage meter reading maximum value and minimum value, obtains this support arm outer surface of pipe fittings cylindricity numerical value；
G, rotating support arm pipe fitting 5 repeats aforesaid operations step a~f, to 5 different direction outer surface cylindricity deviation of support arm pipe fitting
It is measured several times；
H, compare measurement data several times, obtain 5 outer surface cylindricity numerical value of support arm pipe fitting.
Claims (6)
1. a kind of support arm outer surface of pipe fittings cylindricity measurement device, characterized in that the measuring device include upper rack posts (2), under
Strut (3), pole pedestal (1), sliding block (10), sliding rail (6), middle bearing piece (4) and pedestal (7)；The pedestal (7) is fixed on horizontal plane
On, sliding rail (6) are set on pedestal (7)；The sliding block (10) is at least arranged three groups, equipped with sliding rail (6), wherein back one
Group sliding block and pole pedestal (1) fixing assembling, before one group of sliding block filled by ball bearing assembly (9) and support arm pipe fitting (5) to be measured
Match, intermediate one group of sliding block and middle bearing piece (4) fixing assembling；The upper rack posts (2) and lower fulcrum bar (3) parallel arrangement, their rear ends
With pole pedestal (1) fixing assembling, the U-typed frame for toppling over placement is formed, dial gauge (8) are set in the front end of upper rack posts (2)；
The lower fulcrum bar (3) penetrates support arm pipe fitting (5) inner cavity to be measured when measuring operation；The middle bearing piece (4) is used to support to be measured
Measure the rear end of support arm pipe fitting (5).
2. support arm outer surface of pipe fittings cylindricity measurement device according to claim 1, characterized in that the middle bearing piece (4)
Equipped with support arm pipe fitting upper and lower position adjustment mechanism, the shaft with adjusting knob is arranged in support arm pipe fitting upper and lower position adjustment mechanism
(4-1), locking button (4-4) and eccentric bushing (4-2), shaft (4-1) tail end with adjusting knob across middle bearing piece (4) afterwards with lock
Tight button (4-4) assembly, the eccentric bushing (4-2) are sleeved on the shaft with adjusting knob (4-1) in a manner of fixing assembling.
3. support arm outer surface of pipe fittings cylindricity measurement device according to claim 2, characterized in that the middle bearing piece (4)
It is additionally provided with support sleeve (4-3)；The support sleeve (4-3) is sleeved on outside eccentric bushing (4-2), and V-type is arranged on support sleeve (4-3)
Locating slot, described support arm pipe fitting (5) rear end to be measured, which is taken, to be placed on support sleeve (4-3), realizes support arm pipe by V-type locating slot
The position-limiting action of part (5) left and right directions.
4. support arm outer surface of pipe fittings cylindricity measurement device according to claim 1 or 2 or 3, characterized in that the pedestal
(7) it is inverted channel steel structure for Open Side Down, sliding rail (6) are fixedly mounted in end face on it.
5. a kind of support arm outer surface of pipe fittings cylindricity measuring method, characterized in that the measurement method uses above-mentioned measuring device
Realize the comprehensive measurement of outer surface cylindricity, including following operating procedure:
A, U-typed frame is pushed and pulled, rear set sliding block is made to be moved to sliding rail (6) rearmost end；
B, by the inner hole of support arm pipe fitting (5) front loaded ball bearing assembly, support arm pipe fitting (5) rear end is placed on middle bearing piece (4)
In the V-type locating slot of support sleeve (4-3), and adjusted on support arm pipe fitting (5) rear end by support arm pipe fitting upper and lower position adjustment mechanism
Lower position, making support arm pipe fitting (5) is in horizontal positioned state；
C, lower fulcrum bar (3) are inserted into support arm pipe fitting (5) rear end orifice position；
D, U-typed frame is pushed and pulled, the measuring head of dial gauge (8) is made to be located at the left end of support arm pipe fitting (5)；
E, the reading of dial gauge at this time (8) is adjusted to " 0 "；
F, slowly push-and-pull U-typed frame, observation percentage meter reading variation to the right, and record percentage meter reading maximum value and minimum
Value calculates the difference of percentage meter reading maximum value and minimum value, obtains this support arm outer surface of pipe fittings cylindricity numerical value；
G, rotating support arm pipe fitting (5) repeat aforesaid operations step a~f, to support arm pipe fitting (5) different direction outer surface cylindricity
Deviation is measured several times；
H, compare measurement data several times, obtain support arm pipe fitting (5) outer surface cylindricity numerical value.
6. support arm pipe fitting measurements of form and position deviation method according to claim 5, characterized in that in the step b, carry out
When support arm pipe fitting (5) rear end upper and lower position adjusts, the shaft (4-1) with adjusting knob is rotated, eccentric bushing (4-2) is rotated with it,
The tune to support arm pipe fitting (5) rear end upper and lower position is realized by the variation of eccentric bushing (4-2) lateral wall and support arm pipe fitting contact point
Section, then support arm pipe fitting (5) is adjusted to horizontal positioned state by the ball bearing assembly (9) of support arm pipe fitting (5) front end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910351163.7A CN110132108A (en) | 2019-04-28 | 2019-04-28 | A kind of support arm outer surface of pipe fittings cylindricity measurement device and measurement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910351163.7A CN110132108A (en) | 2019-04-28 | 2019-04-28 | A kind of support arm outer surface of pipe fittings cylindricity measurement device and measurement method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110132108A true CN110132108A (en) | 2019-08-16 |
Family
ID=67575426
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910351163.7A Pending CN110132108A (en) | 2019-04-28 | 2019-04-28 | A kind of support arm outer surface of pipe fittings cylindricity measurement device and measurement method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110132108A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19980038589U (en) * | 1996-12-19 | 1998-09-15 | 양재신 | Portable Roundness Meter |
| CN101813572A (en) * | 2010-03-31 | 2010-08-25 | 北京市三一重机有限公司 | Test and detection device for slender rod |
| CN101832873A (en) * | 2010-03-31 | 2010-09-15 | 北京市三一重机有限公司 | Test detection device for slender rod piece |
| DE102017203818A1 (en) * | 2016-03-11 | 2017-09-14 | Fanuc Corporation | DEVICE FOR AUTOMATIC MEASUREMENT OF THE PRECISION OF A SHAFT FOR A MOTOR |
| CN108387191A (en) * | 2018-06-07 | 2018-08-10 | 太仓汉兹精密仪器科技有限公司 | A kind of high-precision cylindricity measuring instrument |
| CN108731628A (en) * | 2018-05-04 | 2018-11-02 | 蒋孔焕 | A kind of pipe fitting cylindricity detection device |
| CN208443287U (en) * | 2018-06-12 | 2019-01-29 | 辽宁忠旺铝合金精深加工有限公司 | A kind of control-rod geometric tolerance detection device |
| CN209945231U (en) * | 2019-04-28 | 2020-01-14 | 中国人民解放军第五七二一工厂 | Support arm pipe fitting surface cylindricity measuring device |
-
2019
- 2019-04-28 CN CN201910351163.7A patent/CN110132108A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19980038589U (en) * | 1996-12-19 | 1998-09-15 | 양재신 | Portable Roundness Meter |
| CN101813572A (en) * | 2010-03-31 | 2010-08-25 | 北京市三一重机有限公司 | Test and detection device for slender rod |
| CN101832873A (en) * | 2010-03-31 | 2010-09-15 | 北京市三一重机有限公司 | Test detection device for slender rod piece |
| DE102017203818A1 (en) * | 2016-03-11 | 2017-09-14 | Fanuc Corporation | DEVICE FOR AUTOMATIC MEASUREMENT OF THE PRECISION OF A SHAFT FOR A MOTOR |
| CN108731628A (en) * | 2018-05-04 | 2018-11-02 | 蒋孔焕 | A kind of pipe fitting cylindricity detection device |
| CN108387191A (en) * | 2018-06-07 | 2018-08-10 | 太仓汉兹精密仪器科技有限公司 | A kind of high-precision cylindricity measuring instrument |
| CN208443287U (en) * | 2018-06-12 | 2019-01-29 | 辽宁忠旺铝合金精深加工有限公司 | A kind of control-rod geometric tolerance detection device |
| CN209945231U (en) * | 2019-04-28 | 2020-01-14 | 中国人民解放军第五七二一工厂 | Support arm pipe fitting surface cylindricity measuring device |
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