Does anyone use round over bits on their CNC? I don’t have a router table so I was thinking of doing the round over on the part while it’s in the machine. Any thoughts, opinions ?
Here is the obligatory “round over in carbide create” thread 
Generally round over bits should work just fine, it’s likely getting the toolpath right that will cause the most headache. Also good to make sure you stay under the max rpm of the specific cutter.
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Thanks for the prompt reply. I figured it would be a challenge that’s why I asked if anyone has done it. I’m still looking for one without the bearing
Search for “point cutting round over bits” and you might have better luck.
Whiteside seems to get mentioned a lot in this space. I used one of their center cutting round overs and I’ve got no complaints with it.
There are several listed w/o a bearing in the afore-mentioned thread, including a product link to Amana Tools.
There’s also a photo showing a box where the lid was cut using such a tool to round off the back so it would rotate, and the sides so that it would match how the front was cut.
Bearing type router bits are a NONO on CNC machines. The bearing can cause all kinds of problems by getting jammed against the material and make you lose steps. Plus you cannot plunge well with a bearing on the bottom.
Bearings and CNC do not and should not mix. As @WillAdams pointed out above they make roundover bits without bearings.
All roundover bits I have have removable bearings.
I used a 1/4 in round over bit for the first time today. I bought a cheap set from Amazon as I have a router table and don’t anticipate needing to use them very often on the CNC. I needed to do an inside roundover on a tray where the pocket was not deep enough for my existing bits to work on the table. I took the feed and speeds for IDC Woodcraft’s sight for his 1/4in roundover and then experimented with a scrap piece to hone in on the best offset and depth of cut that worked for my project. I did both an inside and outside cut. As a starting point, my final experiment that worked for me was an offset vector of 2.5 mm and a max downcut of 4.5 mm…ymmv.
PS, here is the set I bought if you are interested.
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I use an Amana Tool - 56125 round over bit quite a bit on a few projects.
i couldn’t tell you how to make it work in CC as I do it in F360. If you are using F360 you just create the tool, pick the profile and put in an offset a hair less than the tool height.
I typically do the round over before I run the path that cuts out the part. Seems to help prevent chip out.
You may want to check these out. I have them and they work good. You should watch his videos on setup as they are not directly supported in CC.
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Cullen;
Absolutely fantastic info. Can’t thank you enough. Just what I wanted to know. That guy is a great instructor.
Thanks again;
Jim
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I have used them, but I don’t think they’re very good. I use my CAD software to do the round over at the edges.
I use them for complex shapes but for simple ones the hand held trim router is way faster.
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I use roundover bits for complex shapes that are impossible with a bearing. Just remember to offset by half the width of the “point”.
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