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No.000217 Low Impact Clamping Mechanism
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Low-impact clamp
Related Category
Stopper Bolts
| Product name | Stopper Bolts with Bumpers/Straight Type |
|---|---|
| Part number | PUSS10-40 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Use the stopper bolts with resin tip as workpiece clamp components. Worn out items can be replaced easily.
Available sizes
■Stopper Bolts With Bumpers- Straight Type
| Stopper | Hex Screw | Accessory (Hex Nut) | ||||
|---|---|---|---|---|---|---|
| Material | Hardness | Material | Strength classification | Surface Treatment | Material | Surface Treatment |
| Urethane(Black) | Shore A90 | EN 1.7220 Equiv. | 10.9 | Trivalent Chromate | EN 1.0038 Equiv. | Trivalent Chromate |
| EN 1.4301 Equiv. | - | - | EN 1.4301 Equiv. | - | ||
| Polyacetal(White) | - | EN 1.7220 Equiv. | 10.9 | Trivalent Chromate | EN 1.0038 Equiv. | Trivalent Chromate |
| EN 1.4301 Equiv. | - | - | EN 1.4301 Equiv. | - | ||
■Sizes and Dimensions
| Screw Dia. (Coarse) | Thread Length (Selectable) | Stopper Section Length | Stopper Section Dia. | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 10 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 50 | 60 | 70 | |||
| 4 | ○ | ○ | ○ | ○ | ○ | ○ | - | - | - | - | - | 4.5 | 3.1 |
| 5 | ○ | ○ | ○ | ○ | ○ | ○ | ○ | - | - | - | - | 4 | |
| 6 | - | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ○ | - | 4.8 | |
| 8 | - | - | - | ○ | ○ | ○ | ○ | ○ | ○ | ○ | - | 5.5 | 6.5 |
| 10 | - | - | - | - | ○ | ○ | ○ | ○ | ○ | ○ | ○ | 8.3 | |
| 12 | - | - | - | - | ○ | - | ○ | - | ○ | ○ | ○ | 6 | 10 |
Plastic Knobs
| Product name | Plastic Knobs/Mushroom Shaped |
|---|---|
| Part number | NMM6-25 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Highly efficient knob can be mounted economically
Available sizes
■Plastic Knobs - Mushroom Shaped
| Screw | Knob | Screw | |
|---|---|---|---|
| Material | Material | Surface Treatment | |
| Threaded | Phenolic Resin (Black) | EN 1.0715 Equiv. | Trivalent Chromate |
| Tapped | Brass (Insert) | - | |
■Sizes and Dimensions
| Screw | Thread Length | Knob O.D. | Mounting Height | ||
|---|---|---|---|---|---|
| Type | Dia (Coarse) | Threaded | Tapped | ||
| Threaded ･ Tapped | M5 | 10 | 7 | Ø17 | 15 |
| M6 | 11 | Ø21 | 18 | ||
| Ø25 | 22 | ||||
| M8 | 15 | 12 | Ø33 | 30 | |
Square Resin Washer
| Product name | Square Resin Washers/POM/MC Nylon |
|---|---|
| Part number | WSRPM20-40-20 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Best suited for securing workpiece without damaging
Available sizes
■Square Resin Washers
| Material | Color |
|---|---|
| Polyacetal | White |
| MC Nylon Standard Grade | Blue |
■Sizes and Dimensions
| Width | Length (1mm increment) | Hole pitch (0.5mm increment) (hole pitch ≤ width - hole position from end face) | Thickness | Screw Nominal Dia. | Hole position from end face |
|---|---|---|---|---|---|
| 10 | 20-40 | 10.0-30.0 | 3 | 3 | 5 |
| 12 | 24-46 | 12.0-36.0 | 4 | 4 | 6 |
| 15 | 30-60 | 15.0-45.0 | 4 | 5 | 7.5 |
| 20 | 40-80 | 20.0-60.0 | 5 | 6 | 10 |
| 25 | 50-100 | 25.0-75.0 | 6 | 8 | 12.5 |
Accuracy Info
■The accuracy of square resin washer
| Width tolerance | ±0.3 |
|---|---|
| Hole pitch tolerance | ±0.1 |
| Length tolerance | ±0.3 |
| Thickness tolerance | ±0.1 |
IDEA NOTE Impact Proof Clamping
Unnecessary impact is avoided by using a slide shaft with tapered portions.
IDEA NOTE Clamping position is retained by stopper cam.
In the clamping position, the stopper cam fixes the slide shaft. In this state, the only way to unclamp is to first release the cam by operating the knob.
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Application Overview
Purpose
- Purpose
- To clamp workpieces that are vulnerable to impact.
- Operation
- Slide shaft mechanism in clamp helps prevent hard impact of the workpiece being clamped.
- To release the workpiece, first release the knob to disengage the slide shaft, then lift the clamp.
Points for use
- Manual operation
Target workpiece
- Shape: glass circuit board
- Size: W65 x L130 x H0.7mm
- Weight: 10.6g
Design Specifications
Operating Conditions or Design Requirements
- Slide shaft stroke: 10mm
Arm rotation angle: 90° - Outer dimensions: W200 x D380 x H144mm
Required Performance
- Clamping force: 3 to 4N
Selection Criteria for Main Components
- A spring with a spring constant k = 0.16N/mm that satisfies the workpiece clamping force requirement of 3 to 4N is selected.
Design Evaluation
Verification of main components
- The clamping force is verified based on the load moment.
- Confirmation of workpiece clamping force
- Conditional value: distance between rotary shaft and center of gravity of arm Lg = 87.4mm, angle formed by rotary shaft and center of gravity of arm α = 15.3°, mass of arm M = 436.9g, gravitational acceleration g = 9.8m/s², distance between rotary shaft and spring post of arm Lk1 = 95.52mm, angle formed by spring post of link base and spring post of arm and rotary shaft β = 20.69°, distance between spring post of link base and spring post of arm Lk2 = 111.4mm, spring constant k = 0.16N/mm, free length of tension spring Lk0 = 100mm, initial tension of spring F1 = 2.94N, number of springs n = 2 pieces, distance between rotary shaft and clamping part La = 201mm, angle formed by rotary shaft and clamping part γ = 3.27°
- Moment produced by arm mass: Mm = (M x g x cosα) x Lg, hence, Mm = 436.9 x 10⁻³ x 9.8 x 0.964 x 87.4 = 360.74N･mm
Moment produced by tension spring: Mk = {k x (Lk2 - Lk0) + F1} x sinβ x Lk1 x n, hence, Mk = {0.16 x (111.4 - 100) + 2.94} x 0.353 x 95.52 x 2 = 321.26N･mm - Comparison of moment
If we put F as the force of the clamping part and Ma as the moment of the clamping part, from Mm + Mk = Ma = F x cosγ x La, F = (Mm + Mk)/(cosγ x La), hence, F = (360.74 + 321.26)/(0.998 x 201) = 3.39N
-> The clamping force is within the target range (3 to 4N).
Other Design Consideration
- The shape of the stopper makes it possible to fix the slide shaft during clamping, and it is automatically returned by the coil spring built in the spring plunger during unclamping.
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