Half a Cocoon waffle in Oak

I decided to give it a burnt oak effect by using a blunt ball nose cutter and a sort of raggedy effect by machining it on my Firewood2000 CNC router that is made from MDF.
Using a depth of cut that was too deep during roughing I enabled the cutter to spew out occasional burning embers into the piles of sawdust around the job. Hoovering these up to avoid burning the router to the ground meant the hoover nearly caught fire.
I might buy a new cutter and use a smaller depth of cut for the second half!

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Comment by martyn hogg on October 6, 2015 at 3:30am: yep, Firebag650!

The router was doing some strange things on the z-axis... it turned out the stepper motor driver was faulty so it was losing steps on the z-axis... this meant z-zero could move during a job.

In this particular case (after I'd replaced the faulty motor driver) I was just a bit optimistic (and impatient) with how deep a cut i could make!

Comment by mark zirinsky on October 5, 2015 at 7:07pm: a way to achieve datum (Z) accuracy, leave an area of material intact, and then use a feeler gauge to set the height of your tool relative to the surface of material, or a reference block.

Comment by Fred Becquelin on October 2, 2015 at 8:26am: I guess your hoover is a Firebag650 :)

Comment by martyn hogg on October 2, 2015 at 5:55am: Yeah this is one half... I'm still deciding whether to try another half so i can glue them together. I milled the underside first and milled four dowel holes with the same 12.7mm ball nose - if I change tools I tend to lose datum accuracy! That's how good my CNC is! Then I machined 4 holes in the machine bed and flipped the job so I could then mill the top side. It worked quite well really but I will probably change the program to do 3mm depth roughing cuts and just start early in the morning! I do like a bit of excitement but wondering whether I'm going to burn down the garage gets tiresome quickly!

Comment by Siemen on October 2, 2015 at 4:07am: Did you do two sided milling or you milled two sides and glued them together?

Nothing more boring than watching a sharp ball nose cutter making perfect cuts. At least you got some action to make the time pass faster. ;-)