Jointmaker Pro: Preventing Tooth Breakage

Created by Gabriel Izzo, Modified on Thu, 11 Apr at 10:24 AM by Gabriel Izzo

The JMPv2 Jointmaker Pro has four different blade options available and depending on the cutting application, each blade type will perform best when used as intended. However, if you are trying to cut a workpiece on the JMPv2 and the teeth of the blades are breaking off or getting damaged and are not colliding with any other components, this could be due to several factors such as the blade height being too high, the density of the wood, blade type, and the angle the blade is set to. 

For example:

If trying to make too aggressive of a cut with hard woods, especially with thinner kerf Crosscut A and B blades designed for soft woods, there is a higher likelihood of teeth breakage than if the blade angle and height are set less aggressive. Using the more appropriate Crosscut C blade featuring a thicker kerf/tooth designed for denser hardwoods would offer much better performance. Setting the blade height so that the start of the blade sits slightly below the table will also help to prevent teeth breakage and provide a less aggressive cut.
JMP Blades   
  • Crosscut A Blade:  .4mm x 28 tpi; kerf of 0.018;  Most commonly used blade
  • Crosscut B Blade: .3mm x 32 tpi;  Used with softer woods of smaller dimensions.
  • Crosscut C Blade: .4 mm x 28 tpi; kerf of 0.023” for StewMac Fret Wire.  Allows luthiers to cut 0.023” fret slots in a single pass.  It has a slightly thicker crosscut blade which may have an appeal for those who are cutting dense woods. (This would be the most suitable option based on the information provided)
  • Rip Blade: .4mm x 16 tpi; Gives a great finish on rip cuts but periodically cleaning wood fibers that may be embedded in the gullets (with an old toothbrush) may be necessary in between cuts depending on the species of the wood.  Useful for cutting tenons and dovetails.

On Page 11 of the instruction manual, it discusses different cutting scenarios and one of the main considerations is to have the first few teeth set lower than the table, if the first few teeth are sticking up the blade may be raised slightly too high and more prone to the first few teeth of the blade breaking.

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