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Here is a tray I made for my fiancée for Valentine's day. The tray is made out of padauk. I cut the inside of the tray in several passes using my homemade CNC router with a 1/2 inch core box bit. This leaves a nice radius on the bottom that adds some strength to the sides. The sides are approximately 1/8" thick. To make the bottom flat, the final pass only stepped over by about 10% of the bit diameter. This left very tiny grooves in the tray which I was able to remove by sanding. After sanding the inside and outside of the tray I finished it using a semi-gloss acrylic finish.

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Nice tray.
 

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It looks like you have been a busy boy :)

That is a great job for a homemade CNC. I can only imagine all that padauk dust flying everywhere. You did a good job of keeping registration from the outside profile cut to the inside pocket cut. Did you use double sticky tape or some other type of hold-down to keep it in place?

Steve
 

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Steve-
To hold it down I used a pair of wood screws through the workpiece into the auxiliary table (a piece of osb clamped on top of the actual table so I don't cut into the table) outside of the cutting area (in the scrap). I then stopped the machine before it finished the final outside pass ane finished the cut with a flush trim saw. I would like to find a way to cut the outside fully with the machine but haven't come up with anything clever that I am confident in. I considered using some double sided carpet tape, but I want to test that on a piece that I have less invested in first.

I had a shop vac hooked up to the router which caught most of the dust. But it did still leave a nice coating of red dust in a 6' radius around the machine. It did prompt me to start work on an air cleaner, to pull some of the dust out of the shop air, which I hope to finish once my fans arrive for it.
 

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Great looking piece of wood, I like the color.

As for fully cutting the outside, which CAM program are you using? Some CAM programs can add a tab/bridge so that everything is cut, except the tab that holds the piece to the blank. Just cut the tab off, and finish it with a flush trim router bit on a router table or sand it off.
 

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How long did it take you to program it and roughly what is the cycle time on the cutting of it? Very nice your machine and the tray.
 

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Paul- I'm using Cambam. I don't know if it can do it automatically, but I'm sure I could do it manually pretty quick. That's a great idea for making the finish work a lot easier.

Mojo- It took very little time to program the machine to cut this. I created the geometry using Solidworks and then imported the DXF into cambam. I'd say about a half hour of computer work tops (not including the time fiddling with aspect ratios to decide what looked best). It took the machine a little over an hour to cut it. It would have taken about half the time if I had a good way to change bits without losing my depth offset. As it was, I cut the entire thing using a core box bit (ball end). The final pass took almost as long as the rest of the cutting because I had it only move over 10% of the bit diameter per pass. If I could have changed bits while keeping an accurate depth I could have done the bottom using a straight bit in much less time. At some point I'll build a setup to let me zero the bit depth automatically.
 

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Thanks for the update , I ran and programed a CNC lathe for years, its been a while but the programing on that thing was a piece of cake.The control was Mazak.
 

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Very nice project. Other than the dust factor, I love Padauk : )
 

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This is a beautiful tray and so nicely done. Congratulations.
 
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