problem with too large collets.

[knight_toolworks]

I have been buying techniks off of ebay and had no problems. but the last 1/2" one was loose the bit would fall out when you inserted it and you had to tighten the nut more then usual. the 1/4" one held the bit fine. well I figured I would get them from shopbot ad see same brand but both the 1/4" and the 1/2" let the bits fall out. this means you have to use the wrench to tighten it enough to get the bit to stay so it is a bit hard with only two hands.

[Burkhardt]

Check if your collet nut may be binding to not allow hand tightening. Blow it out and apply some suitable lubricant like ColletCare. May or may not help...

[knight_toolworks]

using a less worn nut ( i have 5) and now it will tighten right. still won't hold the bit on it's own and I will miss that.

[Gary Campbell]

Have you mic'd the bit to see if is actually correct size?

[knight_toolworks]

no but it is not tight on any of the 1/2" bits where the old one was. it works fine but when you loosen the nut the bit falls then you have to go and find it (G)