A few mm makes a great difference, as you say.
If my triangle-maths are right, a 90 degree VBit will cut twice as wide as it cuts deep. So a 1mm deep path cuts a 2mm wide groove, and a 2mm depth cuts a 4mm wide groove. So the effect of dips in the surface is doubled in the width of the cuts for that type of VBit.
That seems correct. So⌠if the letter stem width is 0.25, a 90 degree bit will go 0.125 deep. A 60 degree bit will go 0.217" deep. The narrower the angle the deeper the cut until it reaches the flat depth. Either one of them will look good, 60deg will create more of a shadow than 90 and may appear to have more contrast. So if you try a 60 degree V bit instead of a 90 degree V bit it will cut deeper to cover the width of the text and may compensate for the variation in the height difference left to right of the work piece.
@BBvr
The simulation (or our interpretation of it) is less relevant than the thickness of the letters in your design - if the letters in the font are a consistent thickness then Carbide Create will V carve them the same depth.
In my mind, this is the issue. Brand new out of the box - have you done a spoilboard surfacing toolpath? this is basically a big square âpocketâ that just takes off 2-3 thou over the whole wasteboard, ensuring it is coplanar to the Axis on the router. This is a MUST with a new router if you want accurate parts and consistent V-carving.
Regarding your material, how flat is flat? if you want perfect results V-carving, Iâd suggest you run a surfacing toolpath (just a pocket the size of the material that takes a light skim off the top. This will ensure your top surface is coplanar to the wasteboard, which is coplanar to the router Axis.
We can argue all day that the file is the cause, but if your machine isnât trammed and surfaced, and your material isnât surfaced, then it doesnât matter what file you run the results wonât be consistent.
I wouldnât necessarily take that as read, to be honest.
I would check the waste board is flat, the stock is flat and the spindle is trammed correctly.
YeahâŚno. Youâd have to be VERY lucky for the waste board to be flat out of the box. That doesnât even really happen in machines costing 5x as much. Surfacing the spoilboard will likely cure your problem.
I think the thing to bear in mind is the simulation is based on the assumption(by the software) that the stock is flat. It does not know there is a variation in the Actual stock.
If you put a block of stock on the bed 5mm higher at one end and tell the software it is flat it will take your word for it and show simulation as OK but when you do the actual cut you will get a deeper cut at the thicker end. Hence need to flatten stock to ensure it is consistently level.
I donât know if I have explained that clearlyđ¤
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