Trying some cabinet doors with sharp vcarve corners

I’m pretty much a noob, but I did some searching and YouTubing without much luck.

I was able to pocket a shaker style sample piece pretty successfully, but I wanted to see what it would look like with a bevel on it. So I tried a 60 degree vee with a vcarve exactly on the outline, and ended up with rounded corners.

I tried a new piece (without having done the pocketing) with an advanced vcarve, and it’s much better, but there’s kind of a flare in the corner. If somebody could look at the pics and tell me where I’m going wrong that would be great!

Fresh piece:

Thanks in advance!

It looks like there could be some slop in your machine. With the power on, and the spindle off, grab the tool & try to move it right-left, front-back. If it moves, even a tiny amount, that is your issue.

Plywood has a lot of variation in density & hardness, so the forces, particularly lateral forces on the tool fluctuate quite a bit.

My guess would be that the corner is correct, but the path leading away from it moved a bit.

Use a depth of cut that is slightly less than a factor of the total depth. This will result in a ‘finish’ pass for the last cut. i.e. Your total depth is 0.250. You want 3 passes. Divide 0.250 by 2 (0.125) and set your depth of cut to 0.120. Now you should have two passes at -0.120 & -0.240, leaving 0.010 for the last pass.

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If the issue is specific to the 60 degree bit and shows up regardless of material being cut, you might try defining it as a custom V bit with a smaller angle (maybe 57 degrees or even less). This is a guess based on the following picture where I cut gcode (generated for a 60 degree bit) five times, three times by varying zero height and two additional times by intentionally using a bit of an incorrect angle. When I used a 30 degree bit, I got odd corners which might be exaggerated examples of yours. This was an error of -30 degrees in the bit used vs the bit the code was generated for.

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These are both really good pieces of advice, thank you. And I saved that pic, as that makes a good guide.

If I can move the tool by hand, what is the issue and the fix? I haven’t tried I yet but it wouldn’t surprise me.

I plan on replacing the router with a spindle soon.

Investigate what aspect of the machine allows the movement — if loose hardware tighten, if loose belt, tension, if a bad bearing in a spindle, replace, &c.

Cool. Hopefully it’s the router so I HAVE to get a spindle :slight_smile:

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