For a straight through cut in this case, you would need a 90 degree VBit with atleast the radius of the VBit equal to the depth of cut, in this case 0.75.
If we tried this profile cut with a smaller Vbit as is wanted here we would obviously end up with a vertical wall after 0.25 from the bottom of the cut.
However with that in mind for a little extra effort you can utilise the tools in the software to create you a smooth 45 degree angle by using the Molding Toolpath.
For this you will need a line vector to use as a rail, which is already in the project and a vector which represents the shape you want to mold along the rail, In this case a 45 degree vector with a vertical height equal to the depth of cut/material thickness.
Now as the below image shows, we cant just use the Molding Toolpath with a 0.5 inch VBit and expect that to be ok. On the left hand side of the image you can see a few things that would occur here.
1. you will be creating an undercut
2. The tool shank would crash into the top of that undercut
3. Once the toolpath has been ran and crashed into the side of the wood with the shank, the tool with retract directly up, vertically, meaning it will also pull the wood up and most likely it will start spinning around as fast as your spindle, which is very dangerous.
However, what we can do is create another molding toolpath which we run first that uses an End Mill which is capable of cutting the depth of material, essentially paving the way for the VBit. I have tried to demonstrate this with the image on the right.
I have also attached a CRV file which demonstrates what i have done so you can all inspect what it is doing.
I basically create another vector to mold for the Endmill, which starts at the same point, but ends just over the radius of the VBit tool away from where the original 45 degree vector finished, but still keeping it with a vertical depth of 0.75, the thickness of material.
All should make sense if you examine the file.
Please do not run these toolpaths directly on your machine, these images and files are purely to demonstrate concept.
NOTE: When creating your Molding Vectors, please keep in mind that the start point of these vectors determines where the toolpath starts, so if you create a molding vector which has a start point with the node furthest down in Y, the toolpath will start at the bottom of the material and work its way up, which you are not going to want to do, again inspect the vectors i have created here by going into the Node Edit Mode and selecting the molding vectors and you will see that the start points on these are the nodes that a furthest up in Y.
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