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Discussion Starter · #1 ·
Ok this might be a dumb question, but some of my router bits have a screw and nut in the top. What is the purpose of these. I use a ER32 collet so Im not sure if other collet types utilize these or is it for setting depth by bottoming it out in the spindle?
 

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Discussion Starter · #2 ·
Ok this might be a dumb question, but some of my router bits have a screw and nut in the top. What is the purpose of these. I use a ER32 collet so Im not sure if other collet types utilize these or is it for setting depth by bottoming it out in the spindle?
upon further examination these screws are only on my bits with a 3/4 shank
 

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Hi, the threads and nut are for adding a bearing. You can use different bearings to offset the cutter, or if its the same size as the cutter, to restrict the depth of the cut. The most common bits like this are used to cut rabbets to a fixed depth. FYI, here's a picture that might be helpful. Shanks are the part that goes into the collet and they are almost always 1/4 or 1/2 inch in diameter or metric 8mm or 12mm. Collets are extremely precise devices, The difference on inside dimension open vs closed is a few thousandths of an inch. If a collet is damaged in any way, it should be replaced.

397780
 

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They are for setting the depth. I just remove them before using them.
And I'd be willing to bet that 99.5% of the users here have never seen them before.

The only 1/2" shank bits that I've seen them on are diamond tipped compression bits.
 
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