I am trying to make the Rambone slingshot popularized by Winston on his Shapeoko you tube video.
I put loaded one of the pieces into Meshcam and added 1.6mm to the stock thickness that Meshcam provides after loading the STL. The STL is about 17.5mm thick and Meshcam gives that as the Z dimension of the stock, I have 19mm stock so I added 1.6mm to the Z dimension of the stock as shown below
I set up the tool path parameters shown in the screen shot below.
The Meshcam simulation shows the top of the stock being cut, about 1.6mm which is what I expected so as to make the 17.5mm thick part. The simulation also shows the part being cut all the way through the 19mm thick stock.
When I run the program on the Nomad and cut the part, the top surface is not cut as shown in the simulation, and the part is only cut 17.5mm deep so it does not separate from the stock.
In the toolpath parameters the ‘don’t machine top of stock’ is not selected and the max cutting depth shows 19.1mm
What did I do wrong?
The simulation looked good, but the part did not have the correct cutting depth and in did not machine about 1.6mm of the top of the stock as expected.
I am missing something, but cannot quite see it yet.
I tried cutting the part again and this time the program ran for a bit then it moved off the cutting path and into the main body of the slingshot so I stopped the cut. Sigh…
What should I be looking at to try and get this part made?
(I also tried running the STL through Netfab to fix any open triangles but that did not address this problem either…)
(The Rambone STL is too thick to cut from one piece so I used Meshcam to slice it into 3 STL’s and then cut them separately. This particular STL needed to be rotated 180 degrees in the X axis to get the flat part down. The second part that worked did not have to be rotated in Meshcam)