# Carbide Tipped versus Replacement Insert Knife Bits

**URL:** <https://forum.onefinitycnc.com/t/carbide-tipped-versus-replacement-insert-knife-bits/7272>\
**Category:** Accessories\
**Created:** [August 18, 2021, 5:55pm UTC](https://forum.onefinitycnc.com/t/carbide-tipped-versus-replacement-insert-knife-bits/7272 "2021-08-18T17:55:33Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![TheyCallMeJohn](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/theycallmejohn/32/7657_2.png) [@TheyCallMeJohn](https://forum.onefinitycnc.com/u/TheyCallMeJohn)\
**Post date:** [August 18, 2021, 5:55pm UTC](https://forum.onefinitycnc.com/t/carbide-tipped-versus-replacement-insert-knife-bits/7272/1 "2021-08-18T17:55:33Z")

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Hello Forum Friends,  
I was going to purchase a core box bit for routing some juice grooves. I noticed for a few dollars more I can get one with a replacement insert knife rather than the carbide tipped. It would cost a few dollars more but when I had to replace the bit. It would be like half the price. Are there disadvantages I am not thinking of? The only one i can see is that there is bit of lips so I would be limited on the depth I could cut.

Reference: Amana RC-45910 vs 45907 vs 45910

Thanks.

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**Author:** ![WaywardWoodworker](https://avatars.discourse-cdn.com/v4/letter/w/e79b87/32.png) [@WaywardWoodworker](https://forum.onefinitycnc.com/u/WaywardWoodworker)\
**Post date:** [August 19, 2021, 3:29pm UTC](https://forum.onefinitycnc.com/t/carbide-tipped-versus-replacement-insert-knife-bits/7272/2 "2021-08-19T15:29:41Z")

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I’ve never used the insert style bits with the exception of a spoilboard surfacing bit. Looking at the toolstoday site there’s a note for the 45910 which is the cutter with the carbide insert:

RC-45910 is a solid carbide insert knife (RCK-266 included). Not for use in CNC machine.

Not sure why they have that note but it’s a single cutting edge vs 2 cutting edges on the other bits. Also perhaps it’s not as well balanced because of the replacement cutter blade and screw that holds it. 🤷‍♂️

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<div class="post-metadata">

**Author:** ![TheyCallMeJohn](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/theycallmejohn/32/7657_2.png) [@TheyCallMeJohn](https://forum.onefinitycnc.com/u/TheyCallMeJohn)\
**Post date:** [August 19, 2021, 3:35pm UTC](https://forum.onefinitycnc.com/t/carbide-tipped-versus-replacement-insert-knife-bits/7272/3 "2021-08-19T15:35:35Z")

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Oh missed that part… thank you.