Choosing The Right Joint for your Abrasive Belts
Welcome to our Friday training: Which Abrasive Belt Joint Should I Choose?
This week we were looking at the standard belts supplied by Cibo Abrasives. Now we could have used high tech pictures but sometimes nothing beats a good bit of pen and paper.
We need to preface this training by saying that because Cibo make such good belt joints, 99% of our customers don’t care at all which joint we use, because they never have a problem. But it is definitely worth understanding the logic behind the decisions made at the Cibo Abrasives factory.
Abrasive belt joints have come a long way in the last 30 years. The quality of the production equipment used by Cibo means that unless there is a production machine failure or an operator error then the belts just work.
Belt Joint Option 1: ST over lap joint
The ST belt joint is a traditional overlap joint with the abrasive paper being skived on the top and bottom and then glue bonded joint is created.
Belt Joint Option 2: EX over lap and skived joint
Particularly in finer grit paper applications there may be issues with chatter marks on the workpiece. When this happens we recommend moving to the EX belt joint.
Belt Option 3: BB taped butt joint
The ST and EX belt joints are largely used for paper belts. The BB joint is Cibo’s primary option for cloth belts and unless otherwise specified a BB joint will be used.
Using a tape joint also gives additional options in terms of the type of tape used. Most belt joints are made with Kevlar material. In finer abrasive grit belts a thinner tape is used to ensure the flexibility is maintained.
Belt Joint Option 4: BB-EX taped butt joint with skived top face
Similar to the EX joint for paper belts the BB-EX belt joint ensures no marking or chattering of the workpiece.
Belt Joint Option 5: BB-ZZ taped finger joint
And not forgetting the finger joint. Not needed very often nowadays but the sine wave inter connection helps to reduce the impact of the joint on the workpiece. They are most commonly used on glass applications.