There are several factors that can affect boring performance. These factors include short tool life, bore quality and much more. In order to improve bore performance, a machinist must start by fixing any of these things in case there is a problem with them. When you are trying to fix bad bore performance, it is critical that the machine operator changes various parameters and do a test so that he or she can isolate what is wrong with the bore performance.
Part Instability
This is often overlooked as most machinists tend to assume that the problem must be with the bore. The truth is, on many occasions, part instability has a big role to play in most cases of poor boring quality. When the machine has worn spindles, there is the risk that this will affect boring quality. Fortunately for a machinist facing this kind of problem, the solution is usually simple and involves changing cutting parameters as well as insert types.
Check Stock Allowance
Machinists struggle with figuring how much stock to leave for boring applications. When boring, the machinist must remember that parts with reduced stock allowance work best with boring tools with a single point cutter. If you only have a twin cutter bore, the machinist can get around this problem by removing one of its insert holders.
Select Tools for the True Bore Depth
Machinists often choose boring tools based on the target bore gage and diameter. However, most don’t think of the actual bore depth. When you need extra tool length, the machinist can initially have a larger base and then decrease the tool diameter. This yields better results than using the same bar diameter across the length of the tool.
Machine Inserts
Inserts are critical as they lie between the tool and the part that is being worked on. Inserts determine the quality of the boring and can affect it regardless of how good the boring assembly is. Inserts, on the other hand, are affected by the geometry and in this case, pressed geometry is able to withstand stable conditions. The good news for machinists is that inserts are always being improved to optimize their performance during boring operations. However, regardless of the quality of the inserts, the ultimate determiner of the life of an insert is the stability of the cuts that are made with it.
Speed
This refers to the speed and feeds that are used to run the boring system. Machinists must always consider the surface of the part that they are boring. For example, when roughing, the machinist can use more rigid bore toolsbecause the surfaces do not need fine surface finishing. Speed also affects the life span of the inserts. If the machine is run at a very high speed while making heavy cuts, there is a chance for the excessive heat to reduce the life of the inserts.
Handling these factors well will help you achieve better boring performances and protect your boring system as well.
