MDF and 1/16 bit

Should I be able to cut this sea turtle out on a Pro 5 machine with a #111 1/16th bit contour path on 1/4 MDF using the compact router and the default settings in carbide create? I’ve broken 3 bits in a short amount of time using the default settings. Is the design just too intricate? I can cut cookie cutter like shapes without breaking. Any help would be greatly appreciated!
Sample.c2d (532 KB)

1/16" bit in a channel 1/4" deep might be pushing it for the bit. at what stage/point is it breaking?

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Hey Scott,

Your file currently has a 1/8" endmill specified for the cut. A 1/16" is certainly too small for this size art and deep cuts in .5" material.

This type of design is best accomplished with a V-Carve toolpath. Use a #301 or #302. For me, V-Carving provides a much more esthetically pleasing look.

I switched up the toolpathing in this version of the file. Take a look at the simulation.

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Word of reccomendation never cut with the full cutting length if it’s 4xD in a slot this one especially as the geometry is just not set up for what you’re doing.

To give you an idea of why its a combination of the helix, the number of flutes and the length of the flute past the .25" mark and the radial engagement of the cutter. If there is nowhere for the chip to go it gives it a better chance to bind and snap. The engagement of that much of the bit is also just far more stress on it as well. Do you know exactly where in the cut you are breaking, I could take a guess.

I found that even in something like aluminum 3xD still performs ideally but 4xD would break within 10% or less of the time.

Wow! I can’t believe you took the time to modify the file! I’m still new to this and haven’t done anything with v-carve, but seems like that should be next on my list. Thank you. I really appreciate your effort!

The last bit that broke did so when it was just entering the material. There was a small 1/16th hole and that was it.

Thanks for taking time to reply! I’m still new to this and unfortunately, your response is way over my head. :grinning:
However, I’m still grateful for your time.

4xD = 4 times diameter. i.e. cutting a 1/4" deep with a 1/16" cutter would be 4xD.

Slotting: Cutting a slot the same width as the cutter. The tool usually handles the first cut depth or 2 OK, but after that it begins to bind & the chips can’t clear. Snap!!! there goes you bit.
Recommend offsetting the vector a little bit more than the diameter of the tool & using a pocket path. The first pass on each level will still be slotting, but only by the depth of cut. This gives the chips an easier escape & prevents rubbing & binding.

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I like the pocket idea, but is there a way to add tabs to a pocket or some other way to prevent a larger piece from coming loose? This design I have consists of several layers and I have to cut completely through each layer. I’ve made CC file based on your suggestion and have attached it here. Any further input or ideas would be appreciated.
Layered Sea Turtle Pocket.c2d (1.5 MB)

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Do the pocket down to tab depth and then the Final Cut as a profile cut with the tabs.

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