Wear On One Side Of Teeth
Only one side of teeth has heavy wear markings. Probable Cause : Worn wheel flange, allowing side of teeth to contact wheel surface or improper tracking on flangeless wheel. Loose or improperly positioned side guides. Blade not perpendicular to cut. Blade rubbing against cut surface on return stroke of machine head. The teeth rubbing against a...
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. Probable Cause: Side guides are too tight – rubbing near gullets. Excessive “preload” – band riding heavily against back-up...
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. Probable Cause: Excessive band tension. Any of the band conditions which cause the band to be long (#18) or short (#19) on tooth edge. Cutting a tight...
Body Breakage Or Cracks From Gullets
The origin of the fracture is indicated by a flat area on the fracture surface. Probable Cause: Excessive back-up guide “preload”. Improper band tension. Guide arms spread to maximum capacity. Improper beam bar alignment. Side guide adjustment is too tight. Excessively worn teeth. Back
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. Probable Cause: An excessive twist type of stress existed. Guide arms spread to capacity causing excessive twist from band wheel to guides. Guide arms spread too wide while cutting small cross sections. Excessive back-up guide “preload”.
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. Probable Cause: Excessive feeding rate. (Learn more) Too slow of band speed. (Learn more) Using too fine of a tooth pitch for the size of material being cut.
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. Probable Cause : Band saw is a wood cutting saw. Wood cutting saws will run an average of 800-3500 surface feet a min (sfm). Metal...
Heavy Wear And/Or Swagging On Back Edge
Probable Cause: Excessive feed rate. (Learn More) Excessive back-up guide “preload”. Improper band tracking – back edge rubbing heavy on wheel flange. Worn or defective back-up guides. Heavy back edge wear will have a polished appearance or abnormal grooves worn into surface. Swaging of corners can also occur.
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. Probable Cause: Loose side guides. Chipped, worn or defective side guides. Band is rubbing on part of the machine. Guide arms spread to maximum capacity. (Learn More) Accumulation of chips in side guides.
Heavy Wear On Both Sides Of Band
Both sides of band have heavy wear patterns. Probable Cause: Chipped or broken side guides. Side guide adjustment may be too tight. Insufficient flow of sawing fluid through the side guides. Insufficient sawing fluid due to inadequate supply, improper ratio and/or improper application.
Discolored Tips Of Teeth Due To Excessive Frictional Heat
The tooth tips show a discolored surface from generating an excessive amount of frictional heat during use. Probable Cause : Insufficient sawing fluid due to inadequate supply, improper ratio and/or improper application. Excessive band speed. (Learn more) Improper feeding rate. (Learn more) Band installed backwards.
Gullets Loading Up With Material
Gullet area has become filled with material being cut. Probable Cause: Too fine of a tooth pitch – insufficient gullet capacity. Excessive feeding rate producing too large of a chip. Worn, missing or improperly positioned chip brush. Insufficient sawing fluid due to inadequate supply, improper ratio and/or improper application.
Chips Welded To Tooth Tips
High temperature or pressure generated during the cut bonding the chips to the tip and face of teeth. Probable Cause : Insufficient sawing fluid due to inadequate supply, improper ratio and/or improper application. Worn, missing or improperly positioned chip brush. Improper band speed. Improper feeding rate.
Tooth Strippage
Section or sections of teeth which broke from the band backing. Probable Cause: Improper Tooth Pitch. #1 Cause of tooth strippage Band saw is a wood cutting saw. Wood cutting saws will run an average of 800-3500 surface feet a min (sfm). Metal cutting saws are designed to run from 40-300 sfm. When...
Body Breakage Or Cracks From Back Edge
The fracture originates from the back edge of band. The origin of the fracture is indicated by a flat area on the fracture surface. Probable Cause : Excessive back-up guide “preload” will cause back edge to work harden which results in cracking. Excessive feed rate. Improper band tracking – back edge rubbing heavy...
Chipped Or Broken Teeth
A scattered type of tooth breakage on tips and corners of the teeth. Probable Cause : Improper break-in procedure. (Learn more) Improper blade selection for application. (Learn more) Handling damage due to improper opening of folded band. Improper positioning or clamping of material. Excessive feeding rate or feed pressure. (Learn more) Hitting hard spots or hard scale...
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. Probable Cause : Side guides are too tight – rubbing near back edge. Worn band wheels causing uneven tension. Guide...
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. Probable Cause : Excessive band tension Any of the band conditions which cause the band to be long (#18) or short (#19) on...
Wear On Both Sides Of Teeth
The wear on teeth is smooth across the tips and the corners of set teeth have become rounded. Probable Cause : Broken, worn or missing back-up guides allowing teeth to contact side guides. Improper side guides for band width. (Learn more) Backing the band out of an incomplete cut.
