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- > No.000230 Adjustable Guide Mechanism
No.000230 Adjustable Guide Mechanism
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Easy adjustment using coupling, motor and lead screws.
Relevant category
Lead Screw Support Units
| Product name | Lead Screw Support Units - Round - Fixed Side Radial Bearing Type |
|---|---|
| Part number | MRWZ12 |
| Features | Dedicated Bearing Units for Lead Screws. Can be selected according to allowable axial load. Support Side can be purchased in a set by adding -SET when ordering. |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Economical as parts to support lead screw.
Available sizes
■Lead Screw Support Units - Round - Fixed Side Radial Bearing Type
| Material | Surface Treatment | |||
|---|---|---|---|---|
| Main Body | Stop Plate Set | Collar | Bearing Nut | |
| 1045 Carbon Steel | 1018 Carbon Steel | 1018 Carbon Steel | 1018 Carbon Steel | Black Oxide |
■Sizes and Dimensions
| Shaft Bore Dia. | Wrench Flats | Bearing Type |
|---|---|---|
| Fixed Side | ||
| φ8 | 35 | 608ZZCNM |
| φ10 | 42 | 6000ZZCNM |
| φ12 | 44 | 6001ZZCNM |
| φ15 | 52 | 6002ZZCNM |
Technical Calculations
■Lead screw・Lead screw nut selection steps
Calculate Contact Pressure P and Sliding Velocity V based on conditions of use to check that no abnormal wear will occur.
Plot the calculated P and V values against the PV value graph and confirm the intersection.
If the intersection falls inside of line (1) and (2), it is determined that abnormal wear would not occur.
Determine conditions of use.
↓
Lead screw・lead screw nut temporary selection
↓
Calculate (1) Contact Pressure P, (2) Sliding Velocity V,
Confirm if it is inside of (1) and (2) on PV value graph.
↓
Calculate screw efficiency η and load torque T.
(Axial load, rotational speed)
(Lead screw・lead screw nut material)
↑
(If not good)
PV Value graph
- (1) Steel (Lubrication) - Brass
- (2) Steel (Non Lubrication) - Plastic
① Contact surface pressureP(N/mm2)
- Fs: Shaft axial load(N)
- F0: Allowable Dynamic Thrust (N) -> Nuts for Lead Screw Specifications
Thrust when contact surface pressure of the lead screw and nut becomes 9.8 (N/mm2). - α：9.8(Brass) 0.98(Resin)
② Sliding speed V (m/min)
- d2: Screw shaft effective Dia. -> From lead screw specifications table
- d: Screw Shaft Lead Angle (degree) -> Lead Screw Specifications
- n: Screw shaft rotation per minute (nim-1)
③ Screw efficiency η
- μ: dynamic friction coefficient
- d: Screw shaft lead angle (deg.)
<Dynamic friction coefficient reference value >
| Thread Shaft | Nuts for Lead Screws | Dynamic friction coefficient μ |
|---|---|---|
| Steel (Lubricated) | Brass | 0.21 |
| Steel (Unlubricated) | Polyacetal / PPS Resin with Sliding Property | 0.13 |
④ Load torque (N・cm)
- Fs: Shaft axial load
- η: Screw efficiency
- R: Lead (cm)
Coupling
| Product name | Couplings - Slit, Clamping |
|---|---|
| Part number | CPLCN32-12-12 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
With zero backlash suitable for accurate positioning.
Available sizes
■Couplings - Slit, Clamping
| Part | Material | Surface Treatment | Accessory |
|---|---|---|---|
| Main Body | Alum. Alloy | Anodize | Hex Socket Head Cap Screw |
| Disc Pin | Stainless Steel | - |
■Slit Coupling Clamping Type (Aluminum, Normal Type)
| O.D. | Shaft bore Dia. (Select drive/driven sides) | Overall Length | Clamp Screw Dia. | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| φ4 | φ5 | φ6 | φ6.35 | φ7 | φ8 | φ9.525 | φ10 | φ12 | φ14 | φ15 | φ16 | |||
| φ12 | ○ | ○ | 18.5 | M2 | ||||||||||
| φ16 | ○ | ○ | 23 | M2.5 | ||||||||||
| φ20 | ○ | ○ | ○ | ○ | 26 | |||||||||
| φ25 | ○ | ○ | ○ | ○ | ○ | ○ | 31 | M3 | ||||||
| φ32 | ○ | ○ | ○ | ○ | ○ | 41 | M4 | |||||||
| φ40 | ○ | ○ | ○ | ○ | ○ | ○ | ○ | 56 | M5 | |||||
Accuracy Info
■Accuracy of coupling
| O.D. | Allowable Angular Misalignment (°) | Lateral Misalignment (mm) |
|---|---|---|
| φ13 | 2 | 0.1 |
| φ16 | ||
| φ20 | ||
| φ25 | 0.15 | |
| φ32 | ||
| φ40 | ||
| φ50 | 0.2 |
Performance info.
■Load info. on coupling
| O.D. | Allowable Torque (N・m) | Max. Rotational Speed (r/min) | Moment of Inertia (kg・m²) |
|---|---|---|---|
| φ12 | 0.4 | 52000 | 7.8×10−8 |
| φ16 | 0.5 | 39000 | 3.4×10−8 |
| φ20 | 1 | 31000 | 9.1×10−7 |
| φ25 | 2 | 25000 | 2.6×10−6 |
| φ32 | 4 | 19000 | 9.7×10−6 |
| φ40 | 8 | 15000 | 3.3×10−5 |
Rails for Switches and Sensors
| Product name | Rails for Switches and Sensors- Aluminum Type L Dimension Configurable, Shape A,B,C |
|---|---|
| Part number | SENBF3-140 |
| Features | Rails for Switches and Sensors with the overall length configurable and with two through holes machined |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Adjusting sensor position is easy.
Available sizes
■Rails for Switches and Sensors- Aluminum Type L Dimension Configurable, Shape A,B,C
| Material | Surface Treatment |
|---|---|
| 6063-T5 Aluminum Alloy | Clear Anodize |
■Sizes and Dimensions
| Applicable Nut Size | Length (Configure in 1 mm increments) |
|---|---|
| 3 | 50-200 |
| 4 | |
| 5 |
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Application Overview
Purpose
- Purpose
- To automatically change the distance between workpiece guides during setup change.
- Operation
- By connecting right and left hand screw with coupling and rotating only one lead screw, the distance between guide plates is adjusted without changing the center of reference.
Points for use
- Thanks to the coupling that connects the lead screws, adjusting only one side will also adjust the side, maintaining the center between the guide plates.
Target workpiece
- Shape: cardboard box
- Size: W330 x D280 x H110 mm
- Weight: 2 kg
Design Specifications
Operating Conditions or Design Requirements
- Target workpiece width range: 230 to 330 mm
- Outer dimensions: W721 x D420 x H227 mm
Required Performance
- Lead Screw
Single pitch error:±0.02mm
Accumulated pitch error: ±0.15/300 mm
Allowable Load:33.8kg
Selection Criteria for Main Components
- Coupling
- A coupling with an allowable torque of 4 [N·m], small backlash backlash and an allowable torque of 0.66 [N·m] is selected.
Design Evaluation
Verification of main components
- Select motor, lead screws and linear bushings based on the workpiece load and workpiece collision load.
- Confirmation of thrust in axial direction
- Conditional value: workpiece mass W = 2kg, gravitational acceleration g = 9.8m/s², friction coefficient of lead screw μ = 0.21, lead of lead screw: R = 3mm = 0.003m, lead angle of lead screw: θ = 3.77°, rated torque of geared motor with reduction ratio i = 3: T = 0.66N·m, friction coefficient exerted on workpiece: δ = 0.5
- Screw efficiency η
η=(1-μ×tanθ)/(1+μ/tanθ)=(1-0.21×tan3.77)/(1+0.21/tan3.77)=0.24
Thrust of lead screw:F=2π×η×T/R=2π×0.24×0.66/0.003
=331.8N - Force required to move workpiece: P
P=M×g×σ=2×9.8×0.5=9.8N and F > P, the necessary force can be obtained.
- Allowable load of linear ball bushing when workpiece hits the guide
- Conditional value: linear bushing maximum horizontal distance X0 = 370.4 mm, linear bushing distance in transfer direction Y0 = 276 mm, distance between transfer axis and load position X1 = 180 mm, vertical distance between linear bushing axis and load position L0 = 170.5 mm, load applied when workpiece collides Wa = 40 N, basic rated static load of liner bushing C0 = 598 N, number of linear bushings to which load is applied when workpiece collides N = 2 pieces
- Load in transfer direction applied to linear bushing on collision side: Ps=(W/N)+{(X1×W)/2×X0}=(40/2)+{(180×40)/(2×370.4)}=29.72N
- Load in vertical direction applied to linear bushing on collision side: Pn={(L0×W)/(2×Y0)}={(170.5×40)/(2×276)}=12.36N
Therefore, resultant force applied to linear bushing:P=√(Ps2+Pn2)=32.19N＜598=CO (Bushing Dynamic load rating)
Other Design Consideration
- For applications where only small adjustments are needed it is possible to substitute one left and one right hand screw with right/left hand screw and avoid center block and coupling.
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