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No.000063 Long length precision table
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41
Long table constructed from configurable components.
Related Category
Aluminum Extrusions
| Product name | 8 Series/slot width 10/80x80mm |
|---|---|
| Model number | HFS8-8080-380 |
| Characteristic | HFS8 Series 80mm SQ. extrusions with 2 or more slots. |
* Orange colored cells in the table below indicate the part numbers that were actually used in this app. example.
Selection criteria
Durable and easy to assemble
Available sizes
■Aluminum Frames - 8 Series, Base 40, Four-Side Slots, Two Slots per Side
| External size | Extrusion slots applicable screw DIA. | Length configure in 0.5mm increments | Standard | High rigidity type | Light type (Lightweight ･ economical) |
|---|---|---|---|---|---|
| □20 | M5 | 50 - 4000 | ○ | ○ | |
| □25 | ○ | ||||
| □40 | ○ | ○ | |||
| □30 | M6 | ○ | ○ | ○ | |
| □50 | ○ | ||||
| □60 | ○ | ○ | |||
| □100 | ○ | ||||
| □40 | M8 | ○ | ○ | ○ | |
| □80 | ○ | ||||
| □45 | ○ | ○ | ○ | ||
| □50 | ○ | ○ | |||
| □60 | ○ | ○ | |||
| □90 | ○ | ○ | |||
| □100 | ○ | ○ |
Leveling Bolt
| Product name | Leveling Screws/Screw Tip |
|---|---|
| Model number | LVBS20-40 |
* Orange colored cells in the table below indicate the part numbers that were actually used in this app. example.
Selection criteria
Easy to adjust in fine increments
Available sizes
■Leveling Bolts-Standard Type
| Material | Surface treatment |
|---|---|
| EN 1.1191 Equiv. | Black oxide |
| Electroless nickel plating | |
| EN 1.4301 Equiv. | - |
■Sizes and Dimensions
| Screw x Pitch (Fine thread) | Length under head | Hole DIA. | Head thickness | Applicable screw | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 5 | 10 | 15 | 20 | 25 | 30 | 40 | 50 | 60 | 80 | 100 | ||||
| M8 x 0.75 | ○ | ○ | ○ | ○ | ○ | ○ | Ø3.5 | 4 | M3 | |||||
| M10 x 1.0 | ○ | ○ | ○ | ○ | ○ | ○ | ○ | Ø5.5 | M4 ･ 5 | |||||
| M12 x 1.0 | ○ | ○ | ○ | ○ | ○ | ○ | ○ | Ø7 | 5 | M6 | ||||
| M16 x 1.5 | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ○ | Ø9 | M8 | ||||
| M20 x 1.5 | ○ | ○ | ○ | ○ | ○ | ○ | ○ | Ø13 | M10 ･ 12 | |||||
| M24 x 1.5 | ○ | ○ | ○ | ○ | ○ | ○ | Ø17 | 8 | M16 | |||||
| M30 x 1.5 | ○ | ○ | ○ | ○ | ○ | Ø23 | M20 | |||||||
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Each sub-assembly unit can be used as it is or can be edited.
Application Overview
Purpose
- A table used to check for warpage and deflection of long workpieces.
Points for use
- Leveling bolts need to be adjusted manually.
- Table flatness is checked with a bubble level.
- Adjustment is made after the base plate is reinforced with blocks.
Target workpiece
- Long objects
External dims.: W2500 x D100 x H100
Design Specifications
Operating Conditions or Design Requirements
- External dimensions: W2215 x D540 x H770
Required Performance
- Flatness: ±0.2mm/m
Selection Criteria for Main Components
- Leveling bolts
- Leveling bolts are a lower cost alternative to achieve the desired flatness than machining is. Leveling bolts will divide the unit into segments so fine adjustments can be made.
Design Evaluation
Verification of main components
- Calculate the table deflection caused by the work piece.
- Base plate
- Weight: As the adjust plate width supporting the base plate
- Width (b) x Length (L) x Specific gravity = 100 x 410 x 25 x 0.0027 = 2767.5g = 27N
- Beam deflection by own weight: δ1 = 5wL⁴ / 384E
- Beam length: L = 410mm
- Uniformly distributed load: w = Own weight / Beam length = 27 / 410 = 0.06615
- Young's modulus: E = 69300MPa
- Cross sectional moment of inertia: I = bh³ / 12 = 100 x 254 = 130208mm⁴δ1 = 5 x 0.06615 x 410⁴ / (384x69300 x 130208) = 0.0027mm
- Deflection due to workpiece own load: δ2 = WL³ / 48EIδ2 = 10 x 410³ / (48 x 69300 x 130208) = 0.0016mm
- Total deflection = 0.0027 + 0.0016 = 0.0043mm < 0.005mm
Other Design Consideration
- A leveling bolt is placed at each of the four corners of a base plate, making flatness adjustments on each plate possible.
- Aluminum extrusion structure can be segmented for easy transportation.
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