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No.000232 Positioning Mechanism
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94
Manually positioning mechanism.
Related Category
Lead Screw
| Product name | Lead Screws/Straight |
|---|---|
| Part number | MTSTR16-474 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Converts rotary to linear motion.
Available sizes
■Lead Screw, Straight Type, Right-Hand Screw
| Material | Surface Treatment | Compatible lead screw nut | |
|---|---|---|---|
| Type | Material | ||
| EN 1.1191 Equiv. | - | Right-hand Thread | Brass |
| Black Oxide | |||
| EN 1.4305 Equiv. | - | ||
■Sizes and Dimensions
| Screw shaft nominal | Pitch | Overall Length | |
|---|---|---|---|
| 1mm Increment | 100 mm Increments | ||
| 8 | 1.5 | 50 ~ 500 | - |
| 10 | 2 | 80 ~ 1000 | |
| 12 | |||
| 14 | 3 | ||
| 16 | 100 ~ 1200 | 1300 ~ 2000 | |
| 18 | 4 | 150 ~ 1200 | |
| 20 | |||
| 22 | 5 | ||
| 25 | |||
| 28 | |||
| 32 | 6 | 200 ~ 1200 | |
| 36 | |||
| 40 | |||
| 50 | 8 | - | |
* Manufacturable ranges vary slightly depending on material or screw shaft nominal Dia. Please see the product pages for details.
Accuracy Info
■Lead screw: Screw shaft runout tolerance (Max.)
(mm)
| Shaft Dia. | Screw shaft length | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| -125 | 126 -200 | 201 -315 | 316 -400 | 401 -500 | 501 -630 | 631 -800 | 801 -1000 | 1001-1250 | 1251-1600 | 1601-2000 | |
| Ø8 | 0.1 | 0.14 | 0.21 | 0.27 | 0.35 | - | - | - | - | - | - |
| Ø10-12 | 0.09 | 0.12 | 0.16 | 0.21 | 0.27 | 0.35 | 0.46 | 0.58 | - | - | - |
| Ø14 | 0.09 | 0.11 | 0.13 | 0.16 | 0.2 | 0.25 | 0.32 | 0.42 | - | - | - |
| Ø16 | 0.09 | 0.11 | 0.13 | 0.16 | 0.2 | 0.25 | 0.32 | 0.42 | 0.55 | 0.73 | 1 |
| Ø18-20 | - | 0.11 | 0.13 | 0.16 | 0.2 | 0.25 | 0.32 | 0.42 | 0.55 | 0.73 | 1 |
| Ø22-32 | - | 0.09 | 0.11 | 0.13 | 0.16 | 0.19 | 0.23 | 0.3 | 0.38 | 0.5 | 0.69 |
| Ø36-50 | - | 0.11 | 0.11 | 0.11 | 0.13 | 0.15 | 0.17 | 0.22 | 0.27 | 0.34 | 0.46 |
■Lead Screw Accuracy Standards
| Item | Content |
|---|---|
| Allowable Dimension and Tolerance | JISB0217 0218 |
| Screw Accuracy | 7e Class |
| Nut Accuracy | 7H Class |
| Single Pitch Error | ±0.02 |
| Accumulated Pitch Error | ±0.15/300mm |
| Length tolerance | JISB0405(Medium class) |
| Screw shaft end DIA. tolerance | h7 |
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 (lubricated) - Brass
- (2) Steel (unlubricated) - Resin
(1) Contact surface pressure P (N/mm²)
- Fs: Shaft axial load(N)
- F 0 : 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)
Knurled Handwheels - Aluminum
| Product name | Knurled Handwheels/Aluminum |
|---|---|
| Part number | HOKW63 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Consider the operability, and select the one with appropriate O.D.
Available sizes
■Aluminum Knurling with Standard Handle
| Handle | Handle | Handle Thread | Tapped | ||
|---|---|---|---|---|---|
| Material | Surface Treatment | Material | Material | Surface Treatment | |
| EN AW-5056 Equiv. | Black anodize | Nylon 6(Black) | EN 1.0715 Equiv. | Black Oxide | Tapped Hole |
| Without Tap | |||||
| Clear Anodize | Nylon 6(White) | Tapped Hole | |||
| Without Tap | |||||
| EN 1.4301 Equiv. | - | EN 1.4301 Equiv. | EN 1.4301 Equiv. | - | Tapped Hole |
| Without Tap | |||||
■Sizes and Dimensions
| Knob O.D. | Shaft Bore Dia. | Handle Height | Handle | Set Screw Dia. | |||
|---|---|---|---|---|---|---|---|
| (Black Handle, Black Grip, Tapped) | Mounting height | Width | Diameter | Length | |||
| Ø40 | Ø8 | Ø6 ･ Ø8 | 25 | 12 | Ø13 | 18.8 | M5 |
| Ø50 | Ø10 | Ø8 ･ Ø10 | 28 | 13 | |||
| Ø63 | Ø12 | Ø10 ･ Ø12 | 32 | 14 | Ø14 | 20.8 | |
| Ø80 | Ø16 | Ø12 ･ Ø16 | 40 | 15 | Ø16 | 23.8 | M6 |
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Application Overview
Purpose
- Workpiece is roughly set on the manual presser. Using urethane mold bearings and lead screw mechanism, workpiece can be aligned against the presser.
Points for use
- Manual unit is operated by aluminum knurled handwheel mounted on lead screws.
Target workpiece
- Material: Resin
- Shape: thin plate
- Outer dimensions: W140 x D165 x t3mm
- Workpiece weight: 150g
Design Specifications
Operating Conditions or Design Requirements
- Alignment stroke: 19.5mm (for different workpieces, it can be extended up to 45mm)
- Outer dimensions: W183 x D430 x H136mm
Required Performance
- Required accuracy: 0.1mm
Selection Criteria for Main Components
- Lead screw/nut
- The rotary movement is converted to linear movement for manual positioning.
- Urethane Molded Bearings
- Selected to prevent workpieces from being damaged.
Design Evaluation
Other Design Consideration
- For different size workpieces, a scale can be added to visually confirm proper positioning.
- When pushing a workpiece against the presser, the operator has to confirm workpiece final position and avoid excessive handwheel rotation.
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