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Anti-kickback fingers
Anti-kickback fingers are standard safety equipment on most new table saws. The anti-kickback fingers are incorporated into the blade guard and prevent the stock from being thrown at the operator by biting into it when kickback occurs. As long as the stock if fed through the blade in a normal fashion the anti-kickback fingers don't come into play. It is only when the stock binds and kickback occurs that they are important.
Johnstone River Hardwood | Backhousia bancroftii
Johnstone River Hardwood – a particularly fine choice for robust and attractive flooring.
Johnstone River Hardwood is a tree that is native to Queensland that produces a rich, striped, attractive timber. It is prized for its hard wearing yet handsome properties and makes excellent flooring.
Overview
The Johnstone River Hardwood is a medium sized hardwood from the Cairns district of northern Queensland. Its heartwood features various shades of brown, and is often dark and sometimes striped. The timber's texture is fine and even with a variable grain that is usually free of defects. Sapwood is distinctly paler.
Johnstone River Hardwood timber is popular as a flooring material, as its beautifully rich appearance also resists indentation. Parquetry featuring this timber is particularly fine and readily available in most metropolitan centres.
Properties
Shrinkage
| Very Low | Low | Medium | High | Very High | |
Tangential: |
|||||
| 6.1 | |||||
| Radial: | 3 - 4 | ||||
| Unit Movement: |
0.38 % |
Strength Group
| Very High | High | Reasonably High | Medium High | Medium | Reasonably Low | Low | Very Low | |
| Unseasoned: | S1 | S2 | S3 | S4 | S5 | S6 | S7 | |
| Seasoned: | SD1 | SD2 | SD3 | SD4 | SD5 | SD6 | SD7 | SD8 |
Stress Grade
| Structural No. 1 |
Structural No. 2 |
Structural No. 3 |
Structural No. 4 |
Structural No. 5 |
|
| Unseasoned: | F27 | F17 | F14 | F11 | F8 |
| Seasoned: | F27 | F22 | F17 | F14 | F11 |
Density per Standard
| Unseasoned: | 1150 kg/m3 |
|---|---|
| Seasoned: | 990 kg/m3 |
Joint Group
| Very High | High | Reasonably High | Medium | Low | Very Low | |
| Unseasoned: | J1 | J2 | J3 | J4 | J5 | J6 |
| Seasoned: | JD1 | JD2 | JD3 | JD4 | JD5 | JD6 |
Colour
| White, yellow, pale straw to light brown | Pink to pink brown | Light to dark red | Brown, chocolate, mottled or streaky | |
Mechanical Properties
Durability
| Low | Moderate | Reasonably High | High | |
| (0 - 5 yrs) | (5 - 15 yrs) | (15 - 25 yrs) | (more than 25 yrs) | |
| In-Ground: |
||||
| (0 - 7 yrs) | (7 - 15 yrs) | (15 - 40 yrs) | (More than 40 yrs) | |
| Above ground: |
||||
| (0 - 20 yrs, usually < 5) | (21 - 40 yrs) | (41 - 64 yrs) | (More than 60 yrs) | |
| Marine Borer Resistance: |
| Lyctid Borer Susceptibility: |
Susceptible |
|---|---|
| Termite Resistance: |
Not Resistant |
Fire Properties
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | |
| EFH Ignitibility: |
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | |
| EFH Spread-of-Flame Index: |
|||||||||||
| EFH Smoke-Developed Index: |
| 1 - non-combustible | 2 - reasonably non-combustible | 3 - slightly combustible | 4 - combustible | |
| Fire Properties Group Number: |
| Group Number - Other: | 3 if used on MDF or particleboard ≥12mm; veneer thickness 0.6-0.85mm |
|---|---|
| Average Specific Extinction Area: |
<250 |
| Bushfire Resistance: |
BAL 12.5 and 19 – All AS3959 required applications |
Description
| Botanical Name: | Backhousia bancroftii |
|---|---|
| Preferred Common Name: | Johnstone River Hardwood |
| Species Type: | Hardwood |
Appearance
Johnstone River Hardwood produces a fine and attractive timber. The heartwood offers various shades of brown, is often dark and sometimes striped. The timber's texture is fine and even with a variable grain that is usually free of defects. The sapwood is distinctively paler than the heartwood.
Common Applications
Johnstone River Hardwood timber is popular as a flooring material, as its beautifully rich appearance also resists indentation. Parquetry featuring this timber is particularly fine and readily available in most metropolitan centres
Common Form
Sawn
Workability
As it is an extremely hard timber, the Johnstone River Hardwood is rather difficult to work and glue.
Origin of Timber
QLD
Readily Available
NSW, VIC, SA, TAS, QLD, WA
Availability - Further Information
Johnstone River Hardwood is a relatively rare species but can be found as parquetry flooring in main metropolitan centres.
Applications
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Flooring
Whether for structural or finished flooring applications, timber offers durability, versatility and adaptability. The warmth, strength and natural beauty of timber flooring has proved enduringly popular in a wide variety of interior settings.
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