# Bits breaking UGH! **URL:** \ **Category:** X-Carve\ **Created:** [May 9, 2018, 2:36pm UTC](https://community.inventables.com/t/bits-breaking-ugh/55212 "2018-05-09T14:36:24Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![TaylorHamilton](https://avatars.discourse-cdn.com/v4/letter/t/839c29/32.png) [@TaylorHamilton](https://community.inventables.com/u/TaylorHamilton)\ **Post date:** [May 9, 2018, 2:36pm UTC](https://community.inventables.com/t/bits-breaking-ugh/55212/1 "2018-05-09T14:36:24Z")
I’ve broken 4 bits in the last few days. 1 time was by an off-cut hitting the bit. 1 I suspect the feed rate was too high (the recommended settings…so I slowed it down and broke another one. and the last one I’m not sure what could’ve caused it. These are all Inventable’s bits cutting 1/4 plywood; 1/8": 2 2-fluted, 2 up-cut. 3 of them broke in the collet. What am I doing wrong?? From what I’ve read speed rates vary for different bits and materials but is there a guide I can follow? Are these bits not good? ---
**Author:** ![HaldorLonningdal](https://yyz1.discourse-cdn.com/flex009/user_avatar/community.inventables.com/haldorlonningdal/32/72377_2.png) [@HaldorLonningdal](https://community.inventables.com/u/HaldorLonningdal)\ **Post date:** [May 9, 2018, 4:14pm UTC](https://community.inventables.com/t/bits-breaking-ugh/55212/2 "2018-05-09T16:14:08Z")
What RPM and depth per pass? ---
**Author:** ![KeithPatrick](https://yyz1.discourse-cdn.com/flex009/user_avatar/community.inventables.com/keithpatrick/32/52001_2.png) [@KeithPatrick](https://community.inventables.com/u/KeithPatrick)\ **Post date:** [May 9, 2018, 5:19pm UTC](https://community.inventables.com/t/bits-breaking-ugh/55212/3 "2018-05-09T17:19:55Z")
Right off the bat, I’m wondering what your cutting depth is. ---
**Author:** ![TaylorHamilton](https://avatars.discourse-cdn.com/v4/letter/t/839c29/32.png) [@TaylorHamilton](https://community.inventables.com/u/TaylorHamilton)\ **Post date:** [May 9, 2018, 8:15pm UTC](https://community.inventables.com/t/bits-breaking-ugh/55212/4 "2018-05-09T20:15:07Z")
RPM I’m not sure. The Dewalt 611 router is on its highest setting. Depth per pass was .05in. I did more research via the forums and discovered it might be the 1/8" collet adapter. Could be that it was not machined straight. So I have already ordered a new one from Elaire. ---
**Author:** ![HaldorLonningdal](https://yyz1.discourse-cdn.com/flex009/user_avatar/community.inventables.com/haldorlonningdal/32/72377_2.png) [@HaldorLonningdal](https://community.inventables.com/u/HaldorLonningdal)\ **Post date:** [May 9, 2018, 8:19pm UTC](https://community.inventables.com/t/bits-breaking-ugh/55212/5 "2018-05-09T20:19:40Z")
> [@TaylorHamilton](#): > > RPM I’m not sure. The Dewalt 611 router is on its highest setting. Are the broken bits darkened? Runout from a not true collect adapter will not help, thats for sure but I suspect your RPM/Feed rate is too high / to slow causing the but to rub vs cut. ---
**Author:** ![JustinBusby](https://yyz1.discourse-cdn.com/flex009/user_avatar/community.inventables.com/justinbusby/32/30906_2.png) [@JustinBusby](https://community.inventables.com/u/JustinBusby)\ **Post date:** [May 9, 2018, 9:01pm UTC](https://community.inventables.com/t/bits-breaking-ugh/55212/6 "2018-05-09T21:01:21Z")
> [@TaylorHamilton](#): > > The Dewalt 611 router is on its highest setting. Why? That’s like 27k RPM. Put it on setting 1 (16k) and leave it there. ---
**Author:** ![TaylorHamilton](https://avatars.discourse-cdn.com/v4/letter/t/839c29/32.png) [@TaylorHamilton](https://community.inventables.com/u/TaylorHamilton)\ **Post date:** [May 10, 2018, 2:34am UTC](https://community.inventables.com/t/bits-breaking-ugh/55212/7 "2018-05-10T02:34:05Z")
Makes sense. Learning everyday with this machine! Thanks