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No.000137 Adjustable Height Clamping Mechanism
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Simple height adjustment by manual operation
Related Category
Oil free bushing
| Product name | Oil Free Bushings/Copper Alloy/Standard/I.D. F7/O.D. m6 |
|---|---|
| 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 Bushing Copper Alloy Straight, Standard I.D. F7 O.D. m6
Material: High Tensile Brass Alloy, Solid Lubricant Embedded
| I.D. | O.D. | Length | Rotation Stopper Screw | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ø5 | Ø9 | 8 | 9 | 10 | 12 | 15 | M4 x 8 | |||||||
| Ø6 | Ø10 | 8 | 9 | 10 | 12 | 15 | 16 | 19 | 20 | |||||
| Ø8 | Ø12 | 8 | 9 | 10 | 12 | 15 | 16 | 19 | 20 | 25 | ||||
| Ø10 | Ø14 | 8 | 9 | 10 | 12 | 15 | 16 | 19 | 20 | 25 | 30 | |||
| Ø12 | Ø18 | 8 | 9 | 10 | 12 | 15 | 16 | 19 | 20 | 25 | 30 | 35 | ||
| Ø13 | Ø19 | 9 | 10 | 12 | 15 | 16 | 19 | 20 | 25 | 30 | 35 | |||
| Ø15 | Ø21 | 9 | 10 | 12 | 15 | 16 | 19 | 20 | 25 | 30 | 35 | 40 | ||
| Ø16 | Ø22 | 9 | 10 | 12 | 15 | 16 | 19 | 20 | 25 | 30 | 35 | 40 | ||
| Ø18 | Ø24 | 9 | 10 | 12 | 15 | 16 | 19 | 20 | 25 | 30 | 35 | 40 | M5 x 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
- [Purpose] To clamp resin workpieces by manually switching the clamping height according to the workpiece model.
- [Operation] To any one of the grooves at different heights provided on the vertical shaft, a horizontal pin that is arranged perpendicular to the vertical shaft is fit so as to position the clamping height. This pin securely fixes the shaft at its tapered portion. To change the clamping height, the horizontal pin is pressed to release the vertical shaft. When the work presser is set at the desired height and the pin is released, the pin is returned by the spring, the tapered portion of the pin fits in the shaft groove, and then the shaft is fixed. After that, the workpiece is clamped.
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 with an allowable load range, within which the load applied to the vertical shaft by the tapered portion of the horizontal pin falls, 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) x k = (30 - 26) x 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 x L) = 13.7 / (8 x 10) = 0.17N/mm²
- As two oil free bushings are arranged, the force applied to one bushing: P' = P / 2 = 0.085N/mm²
- As allowable maximum load on oil free bushing, copper-alloy type is980N/mm² > P' = 0.085N/mm² , safety is secured.
Other Design Consideration
- On vertical shafts and horizontal pin, oil free bushings are installed at two locations each.
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