Our roughing pass will have a clearance of. We use styles to do this so we don't have to keep adjusting the parameters. Once you have the two selected, create a roughing and finishing profile. Now we want to input the file in our CAM program to establish the machining operations. The rounded corner also provides a relief for any stress at the corner, or stress cracks that could arise. This is also a good place for some glue to sit to provide added strength. The bit had to do an overcut to be able to marry flat to the adjacent corner. The inside corners are not going to be perfectly square because we used a bit that is round. Normally we would put a bit of a tolerance between the finger and make it a little bit thinner, but for the time we kept it at zero to see if the wood was forgiving enough to do this, if not we would need to add a thousandths of an inch displacement. First we joined all the lines to create a polygon. We took that same piece and rotated it 180 degrees. We then had four inches of width and the fingers protruding out. 755 so it could compensate for the corner. 755 so we wanted to go a bit farther than. The sheet stock that we used actually measured. The joint is four inches wide with fingers one inch each. The pieces are small to demonstrate the joint specifically. The finger joint will not lock together unless the joint is very tight, but even with a tight fit, the joint (without glue) is not permanent. The aim is to make the fingers sized so that they are snug, but may allow some wood glue to be added to secure it permanently. This joint - as it's name implies - is a joint that exhibits protrusions that measure the thickness of the wood, so that when put together, the corner is flush.īoth pieces of wood will have these protrusions offset from each other so they both marry correctly. We will start with a simple joint, a finger joint. The material will be 3/4" sheet stock and the parts will be milled using a 3 axis CNC machine (Our greenBull). In this video we will demonstrate practical CNC wood joinery (practical meaning that there will be no need for special jigs).
#Cambam cut inside of 3d only series
This is part one of our tutorial series entitled "Practical CNC Joinery." In Part 1 of the series we will be discussing Finger Joints.
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