CNC router tips

From a tool life standpoint you want to have as high of a feed rate as possible in relation to your RPM. or another way of looking at it, produce as large of a chip load as possible. Many factors exist that will not allow you to reach this goal, such as.

  • Insufficient work holding (parts will start to move)

  • Unsatisfactory finish quality

  • Tool breakage (tool cannot withstand large chipload)

  • Machine horsepower or feed restrictions

  • Tool holder rigidity

All of the above considerations must be taken into account when optimizing your cutting parameters, there is no easy way to provide exact parameters unless all information is taken into account. 

A rule of thumb is to advance the tool in the toolpath gradually until the finish starts to deteriorate and then back-off the feed rate by approximately 10%. In doing so, you'll be confident that you're getting the longest cutting life from your tool providing all the above mentioned factors are met.  A chip-load calculator can fine tune this further.

Remember: Too big a chip load will decrease the finish. Too small a chip load will decrease the life of the tool.

Saw tooth edge Wear

A tool that is no longer able to produce a satisfactory cut can tell us a lot about your cutting tool application. Whether or not you are achieving your maximum tool life, or if the edge is failing before the most wear is achieved. There are many different types of wear, and by assessing the type in your application we may be able to save you money.

Acceptable Wear

Image on the right shows the side view of a carbide tipped saw blade that has a favorable wear pattern. The corner of the tooth is showings signs of abrasive wear caused by extended time spent in the contact with the working material. The final result is a rounding of the once sharp cutting edge. More tool life may be achieved with a harder carbide material, however this can lead to increased risk of mechanical failure.

 

Unacceptable Wear

The image on the right shows the top view of a carbide tipped saw that has unfavorable wear pattern. The corner of the tooth has been well overused in the cutting application. It is in your best interest to not let the blade get to this condition as much more carbide stock removal during sharpening means a reduced lifespan of the tool. We also do not recommend using the blade once it dulls to cut material that doesn't require a good finish. Excessive heat for a prolonged duration will destroy the tip's edge and cause damage to the tensioned saw plate.

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