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- > No.000137 Adjustable Height Clamping Mechanism
No.000137 Adjustable Height Clamping Mechanism
12
12
Simple height adjustment by manual operation
Relevant category
Oil Free Bushing
| Product name | Oil Free Bushings I.D. F7 - Copper Alloy |
|---|---|
| Part number | MPBZ12-12 |
| Features | The most standard type in the Copper Alloy series. |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Suitable for Sliding Bearing of shaft loading / unloading.
Available sizes
■Oil Free Bushings I.D. F7 - Copper Alloy
Material: High Tensile Brass Alloy, Solid Lubricant Embedded
| I.D. | O.D. | Length | Rotation Stopper Screw | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| φ5 | φ9 | 8 | 9 | 10 | 12 | 15 | M4×8 | |||||||
| φ6 | φ10 | 8 | 9 | 10 | 12 | 15 | 16 | 19 | 20 | |||||
| φ8 | φ12 | 8 | 9 | 10 | 12 | 15 | 16 | 19 | 20 | 25 | ||||
| φ10 | φ14 | 8 | 9 | 10 | 12 | 15 | 16 | 19 | 20 | 25 | 30 | |||
| φ12 | φ18 | 8 | 9 | 10 | 12 | 15 | 16 | 19 | 20 | 25 | 30 | 35 | ||
| φ13 | φ19 | 9 | 10 | 12 | 15 | 16 | 19 | 20 | 25 | 30 | 35 | |||
| φ15 | φ21 | 9 | 10 | 12 | 15 | 16 | 19 | 20 | 25 | 30 | 35 | 40 | ||
| φ16 | φ22 | 9 | 10 | 12 | 15 | 16 | 19 | 20 | 25 | 30 | 35 | 40 | ||
| φ18 | φ24 | 9 | 10 | 12 | 15 | 16 | 19 | 20 | 25 | 30 | 35 | 40 | M5×8 | |
Accuracy Info.
■Accuracy of Oil Free Bushing Copper Alloy Straight, Standard I.D. F7 O.D. m6
I.D. Tolerance: F7
Recommended Mating Shaft
d8: General Use (High-Load)
f8: High Precision Use
e7: General Use (Light Load)
g6: High Precision Use (Intermittent Operation)
Performance info.
■Load information of oil free bushing copper alloy type
| Regular | Non-lubricated | |
|---|---|---|
| Maximum Allowable Load | 29N/mm2 | |
| Maximum Allowable Velocity | 60m/min | 30m/min |
| Maximum Allowable PV Value | 1990kgf/cm2・m/min | 1010kgf/cm2・m/min |
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Application Overview
Purpose
- Height adjustment to clamp workpiece according to its height.
- There are three shafts in this system. Two of the vertical shafts are parallel to each other. One of the shaft acts as a linear guide, and the other shaft is tapered to fit onto a perpendicular horizontal third shaft. The third shaft perpendicular to the two parallel shafts will be spring loaded and can be position back and forth to lock and unlock the vertical tapered shaft. With this mechanism, we would have the flexibility to adjust the height of the clamp and secure position.
Target workpiece
- The height of resin parts differs depending on the model.
- Size (1): W80 x D90 x H67mm
Size (2): W80 x D90 x H45mm
Size (3): W80 x D90 x H30mm - Weight (1): 170g
Weight (2): 110g
Weight (3): 70g
Design Specifications
Operating Conditions or Design Requirements
- Different heights: 3 positions
Height (1): H67mm
Height (2): H45mm
Height (3): H30mm
Outer dimensions: W177 x D170 x H170mm
Required Performance
- Positioning accuracy: ±0.3mm
Selection Criteria for Main Components
- Oil free bushings within the allowable load range of the vertical shaft of the tapered portion are selected.
Design Evaluation
Verification of main components
- Confirmation that the force applied to the oil free bushings is within the allowable range
- Conditional value: taper angle of horizontal pin: θ=5°, vertical shaft diameter = oil free bushing inner diameter: d=8mm, oil free bushing length: L=10mm, spring coefficient of the spring:k=0.3N/mm, spring free length: Lf=30mm, spring length when shaft is fixed:Ls=26mm.
- Force applied to horizontal pin by spring when shaft is fixed:F=(Lf-Ls)×k=(30-26)×0.3=1.2N.
- Force at which tapered portion of horizontal pin presses shaft in lateral direction: W=F/tanθ=1.2/tan5°=13.7N
- Force in radial direction applied to oil free bushings:P=W/(d×L)=13.7/(8×10)=0.17N/mm ²
- As two oil free bushings are arranged, the force applied to one bushing: P'=P/2=0.085N/mm ²
- As allowable maximum load on oil free bushing, copper-alloy type is980N/mm ² > P'=0.085N/mm ² , safety is secured.
Other Design Consideration
- Oil free bushings are installed on both the horizontal pins and the vertical shafts.
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