Tork Craft - Cove Router Bit 1/4" - Tork Craft - Cove Router Bit 1/4"

Router Bit / Collet Fit 

It is essentially important to know how deep the shank of a router bit should fit into the collet. Refer to the picture on the right and consider the following:

• Insert the shank of the router bit at least 80% of its shank length into the collet
• When inserting the shank of the router bit into the collet, allow it to bottom out inside the collet, then lift it ± 3mm and then tighten the collet nut. (When bottoming-out, the bit will fall out and possibly cause harm)
• Never over-tighten the collet (It might break)
• Regularly clean the collet from any residue
• Consider a collet as a consumable item. Over time wear and tear will cause it to fail.
• Remember that in most routers, the collet and the collet nut forms a unit. The collet nut has a retainer clip inside and the collet has a lip that clicks into this clip inside the collet nut. Thus DO NOT [NEVER] insert the collet first into the router shaft, then the Collet nut and then the Router bit. THIS IS WRONG. First click the collet into its collet nut and then insert it into the shaft.
  

Explaining the Specifications:

• (d) » The diameter of the shank or shaft. This size should be the same as the collet size of your router. Example: a small router is mostly supplied with a quarter inch collet that is 6,35 mm inside diameter.
• (B) » The length of the cutting edge of the router bit
• Common collet sizes:
  • 1/4" collet = 6,35mm inside diameter
  • 8mm collet = 8mm inside diameter
  • 12mm collet = 12mm inside diameter
  • 1/2" collet = 12,7mm inside diameter
  • NOTE that the 12mm and the 12,7mm (1/2") sizing are often misunderstood. 1/4 inch is not 6mm but exactly 6,35mm. A 6mm shank will