Settings for bit

[chckblier (Chuck Blier)]

I have a Freud Round Nose bit, will be cutting into Solid Ash, the bit is 3/8 radius, 3/4 wide. Im not sure where to start with the tool setting for the tool path in Carbide Create. It also has 2 cutter heads… My gut is telling me to set the following but im not sure… ANY HELP appreciated

Geometry
Diameter = 0.75 inch
Flute length = 0.375 inch
Include Angle = ???
Num Flutes = 2

No idea on 2D (I will be cutting plates, dont need 3d settings but if you know them would appreciate them as well)

Thanks anyone in advance
Chuck

[mhotchin (Michael Hotchin)]

I’d enter it as a ‘Ballnose’ bit, CC understands that geometry.

Number of flutes isn’t used anymore by CC, so the value doesn’t matter.

Once you pick Ballnose, included angle isn’t relevant.

[Binky-the-horse (James Keeler)]

I’m new also but have done a fair amount of woodworking. With handheld routers, lager bits sometimes required lower speeds in order to operate safely. Does he need to specify a spindle speed or just compensate by taking shallower passes?

[chckblier (Chuck Blier)]

thank you! very helpful, I didn’t know any of this.

[chckblier (Chuck Blier)]

Thank you very much for replying, you do specify a spindle speed. ive been woodworking for a long time too and keep close eye on spindle speed. much appreciated that you are looking out to help

[gdon_2003 (Guy Donham)]

I found a Freud 18-112 bit and went on the Freud site where they have a F&S calculator. They recommended from 350-550 IPM which is fantastically high for a hobby CNC. The calculator was set for 7/16" depth of cut (the only value available) and suggested 18000 RPM. So I agree with the RPM but a 60-80 IPM would seem a good idea. C3D does not have any 3/4" ball nose bits to compare the F&S to so make a custom tool and set your depth of cut around .05" per pass to start out with. If you get any burning drop the DOC to a shallower pass. The 18000 RPM seems reasonable. A 3/4" bit is a lot of mass turning on a trim router so just depending on your material you may need to do a test run on some scrap to dial in your F&S.

The C3D #202 1/4" ball nose does a .040" depth of cut at 60 IPM. Their F&S are conservative so try that to start with. Your bit is 3 times bigger but could be a starting point to adjust up or down depending on material hardness or things like cherry which burn really easy. Just do a test in scrap and not on your actual project to get the adjustments down.