Saw Blade Failure
There are many elements that can cause a failing blade. In this section you will be able to determine why your blade broke or why your blade looks unusual after run time.
When looking at the blade observe the following: What is the current issue? Were did it break? The angle of the break? Does it have heavy wear on the sides? Chipped teeth or even cracks?
Knowing the issue of the blade, click on the Observation below that best describes the issue and learn what the cause of the failed blade was. Below is a list of Observations 1-20.
1. Heavy Even Wear On Tips and Corners Of Teeth
2. Wear On Both Sides Of Teeth
3. Wear On One Side Of Teeth
4. Chipped Or Broken Teeth
5. Body Breakage Or Cracks From Back
6. Tooth Strippage
7. Chips Welded To Tooth Tips
8. Gullets Loading Up With Material
9. Discolored Tips Of Teeth Due To Excessive Frictional Heat
10. Heavy Wear On Both Sides Of Band
11. Uneven Wear Or Scoring On The Sides Of Band
12. Heavy Wear And/Or Swagging On Back Edge
13. Butt Weld Breakage
14. Heavy Wear In Only The Smallest Gullets
15. Body Breaking – Fracture Traveling In An Angular Direction
16. Body Breakage Or Cracks From Gullets
17. Band is Twisted Into A Figure “8” Configuration
18. Used Band Is “Long” On The Tooth Edge
19. Used Band Is “Short” On The Tooth Edge
20. Broken Band Shows A Twist In Band Length
OR
Look at the images below.
1. |
Heavy Even Wear On Tips and Corners Of Teeth |
The wear on teeth is smooth across the tips and the corners of set teeth have become rounded
The side of teeth on both sides of band have heavy wear markings.
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3. |
Wear On One Side Of Teeth |
Only one side of teeth has heavy wear markings.
4. |
Chipped Or Broken Teeth |
A scattered type of tooth breakage on tips and corners of the teeth.
The fracture originates from the back edge of band. The origin of the fracture is indicated by a flat area on the fracture surface.
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Section or sections of teeth which broke from the band backing.
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High temperature or pressure generated during the cut bonding the chips to the tip and face of teeth.
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Gullet area has become filled with material being cut.
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The tooth tips show a discolored surface from generating an excessive amount of frictional heat during use.
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10. |
Heavy Wear On Both Sides Of Band |
Both sides of band have heavy wear patterns.
11. |
Uneven Wear Or Scoring On The Sides Of Band |
Wear patterns are near gullet area on one side and near back edge on opposite side.
12. |
Heavy Wear And/Or Swagging On Back Edge |
Heavy back edge wear will have a polished appearance or abnormal grooves worn into surface. Swaging of corners can also occur.
13. |
Butt Weld Breakage |
To determine if the band broke at the weld, inspect the sides at the fracture to see if there are grind markings from the weld finishing process.
14. |
Heavy Wear In Only The Smallest Gullets |
Heavy wear in only the smallest gullets is an indication that there is a lack of gullet capacity for the chips being produced.
15. |
Body Breaking – Fracture Traveling In An Angular Direction |
The fracture originates in the gullet and immediately travels in an angular direction into the backing of band.
16. |
Body Breakage Or Cracks From Gullets |
The origin of the fracture is indicated by a flat area on the fracture surface.
17. |
Band is Twisted Into A Figure “8” Configuration |
The band does not retain its normal shape while holding the sides of loop together. This indicates the flatness has been altered during use.
18. |
Used Band Is “Long” On The Tooth Edge |
“Long” on the tooth edge is a term used to describe the straightness of the band. The teeth are on the outside of the arc when the strip is lying on a flat surface.
19. |
Used Band Is “Short” On The Tooth Edge |
“Short” on the tooth edge is a term used to describe the straightness of the band. The teeth are on the inside of the arc when the strip is lying on a flat surface.
20. |
Broken Band Shows A Twist In Band Length |
When a broken band lying on a flat surface displays a twist from one end to the other, this indicates the band flatness has been altered during use.
