Abrasives Lesson 3: Splices

by EMI Supply, Inc.
This article was published on Thursday March 19, 2009.

Lesson 3

Splices

Belt Splices

Great demands are placed on coated abrasive belts for a wide range of applications from heavy stock removal to surface finishing and polishing. This could not be possible if belt splice technology had not kept pace with these demands.
The belt splice must be at least as strong as the coated abrasive product itself, run smoothly, and be durable enough to outlast the life of the abrasive belt. To meet product and application demands, Carborundum Abrasives offers several different splices which fall into two basic splice types: lap and butt.

Lap Splices


The lap splice is formed by overlapping the two ends of the abrasive belt about 3/8" and then bonding with special adhesives. The abrasive grain is removed from the bottom lap with a diamond wheel (skived) prior to joining. There are two types of lap splices available: top skived or no top skived.
 

Top Skived (TS)


The top lap of the splice has some or all of the abrasive grain removed, depending upon the grit and application The TS splice is no thicker than the rest of the belt; it is smooth running, ideal for platen or hard density contact wheel support where splice marking problems are usually encountered.


No Top Skive (NTS)


No grain is removed from the top lap of the splice. Has the best splice wear resistance. Generally used on unsupported (slack of belt) or contact wheels with average resiliency that will offset any splice bump as a result of the thickness of the splice.



Butt Splices


The butt splice is formed by butting the two ends of the abrasive material together without overlapping. A thin, strong, reinforced plastic film is then pressed to the backside of the splice to hold it together, creating a non-directional splice. Carborundum Abrasives offers two types of butt splices: CB and KB
 

CB


Our most common butt splice. A high strength splice that can be used on all grits for most applications.


KB

A special splice designed specifically for woodworking drawer sanding operations, incorporating a graphite lubricant on the backside of the splice area. This coating over the spliced film aids in reducing heat and friction buildup associated with this application.


Competitive Splice Designations

Carborundum Abrasives

3M

Norton

TS
NTS
CB
KB

TS
NTS
Fabri-Lok
Fabri-Lok

TS
NTS
Plyweld
Plyweld
 

Recommended Lap-Type or Butt Splices for Both Cloth & Paper Products by Application

Metalworking

Backing

Recommended Splices

Backstands

Cloth

NTS or CB - All grits & sizes

Centerless & Wire Grinding

Cloth

CB - All grits and sizes

Crankshaft Polishing

Paper or
Cloth

NTS or CB - 50 & Coarser
TS or CB - 60 & Finer

Jet Blades -

Mechanized

Cloth

TS or CB - All grits & sizes
 
Offhand

Cloth

NTS - 60 & Coarser
NTS or CB - 80 & Finer

Platen

Cloth

TS or CB - All grits & sizes

Roll Grindinq

Cloth

CB - All grits

Slack of Belt

Cloth

NTS or CB - All grits & sizes

Thru-feed - Narrow Belts

Cloth

NTS or CB - 80 & Coarser
TS or CB - 100 & Finer
 
Paper

NTS - All grits & sizes

Sectional Belts

Cloth

NTS - 60 & Coarser
TS - 80 & Finer
 
Paper

NTS - All grits & sizes
 

Woodworking

Backing

Recommended Splice

Bull Nose or Dead Head Sander
 
Cloth

TS - All grits & sizes

Drawer Sanders
   
Cloth

KB - All grits & sizes

Edge Sanders
   
Cloth

TS - All grits & sizes

Mould Sanders
   
Cloth

TS - All grits & sizes

Stroke Sanders (Lever and
Thru-Feed
 
Cloth

NTS - 50 & Coarser
TS - 60 & Finer
       
Paper

NTS - All grits & sizes

Wide

Plywood/ Particle-board

Single Splice
Under 53”

Cloth

TS - All qrits

Belts

Paper

NTS - All qrits & sizes
 
Single Splice 53" & Over

Cloth

TS - All grits
 
Sectional Belts Pacer

NTS - All qrits & sizes
 
Abrasive Planing (24, 36, 40 Grit)
 
Cloth

CB - All grits
 
Thru-Feed Sanders
 
Cloth

NTS or CB - 80 & Coarser TS or CB - 100 & Finer
     
Paper

NTS - All grits & sizes
 

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Questions on Lesson 3

1. Which is the correct splice to use on a drawer sanding operation‌:
a. TS
b. KB
c. CB

2. A splice with all or part of the abrasive grain removed from the top lap of the splice is:
a. NTS
b. CB
c. TS
d. KB

3. The lap splice is non-directional:
a. True
b. False

Courtesy of Carborundum Abrasives

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