I just did my first 3d carve of a spoon. On the top side of the spoon you can see the dish is not centered in the spoon. I did the top cut first and the flipped the workpiece and proceeded with the bottom cut. everything appeared normal. After finishing up I took the spoon out of the work piece and saw the alignment issue.
Here are the links to the c2d files
https://www.dropbox.com/scl/fi/3qzctynyrzu1873qdoeb1/Spoon-Bottom.c2d?rlkey=vv8904oupnogt60dtapmweu0f&st=c2485zfe&dl=0
I notice in both files you have the zero at Lower Left. Are you certain your stock was EXACTLY 4.000" wide? And how did you index the stock on the machine to insure the location?
Looks like fixture issue when you flipped. You have to make sure you dimensions measured are dead on and the flip holding jig is square to the machine and there is absolutely no dust or material left in the jig when flipping the project.
I used an L Square to align the stock. I secured the stock with hold downs and used the essential clamps to hold the stock square to the machine. I cut the stock with my table saw, so the cuts were measured at 4"x12"
I did center the project to the stock. That’s why the dish being offset by about 1/2in bothered me.
When you flip front to back, the physical corner that was front-left now becomes back-left.
If you’re using front-left zero for both, the stock has to be exactly the width you specify.
I typically set them up like this, in one file so I’m using the same physical corner for both setups.
On the machine, after the flip I will index Y zero to the back of the stock.
Holy beans that’s genius. Saving this one mentally for when I do flip carving.
There is also the use of dowels (2) on the centerline of the flip.
Or, machining the outside profile, if only partway down, so it fits on your “L” bracket perfectly when you flip it.
Since I’m new to 3d carving and I’m not quite grasping the 1 file for both cuts, If I leave it as 2 separate files, can I change the 2nd cut to start from the Top left of the stock, so it looks like the exact starting point as the 1st top cut file when flipped?
Sure. that will work too.
Here’s Opie’s (Kevin’s) video using the “flip frame” and cutting the profile.
This method has the advantage of accounting for an imperfect machine calibrations.
It will cut the frame to, in your example 4" x 12", relative to the model with the current calibration.
i.e. if the calibration is off +10%, it will cut the model 10% larger, but also cut the frame 4.4 x 13.2, so the model lines up on the other side.
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