Using the post-processor found through these forums (rep to martin-db, I think), I have the origin set to the lower left top surface. I didn’t review the gcode the first run and quickly realized that X and Y are moving to negative values (Z is fine).
I tried searching on autodesk for an answer but only came up with answers for troubles with Z. I am sure there is something simple I am missing.
Here are the snippets of code with negative values:
I am not sure what I fudged around with after the first run but this time around there are very few lines directing the machine into the negative (my work area is 609.6x609.6 and it was printing 300 to -300 last time).
This is not that big of a deal at this point (my machine can actually move 26 inches in x and y).
I was thinking that this might be a problem with my roughing operation, I have 0.50mm set for material to leave… thoughts?
Negative is fine. This usually means that your part is at the zero point and to cut it out it has to move a little beyond it. Usually at least the cutter width. Another reason we don’t usually use end stops.
I had this problem too. What I did was change my material size so that the stock was larger than the item I was cutting. I then centered the part in the stock and set the 0,0,0 of the CNC to be the corner of the stock with the bit just touching the top of it.
Doing this also allowed me to locate hold down screws in the stock so that the mill would make sure and miss them during rapid movements across the board.
initially it was generating the gcode from -300 to 300. Now there is that bit of negative movement, so no problem with the part currently, just wanted to make sure there wasn’t a setting I was missing as I move on in the things I create with Fusion360.
am I wrong in thinking that when I do this roughing operation that Fusion360 will not allow my tool to go anywhere that it cannot fit/safely remove material without messing up the design? Right now I have it set up so I use adaptive clearing with 3/16" flat mill, then 1/8" ball spiral cut, then finish off with some cheapo HF diamond rotary bits (1.9mm and 0.7mm). The simulation appears to preserve the model and avoid collisions… didn’t allow my rough cut the other night to run long enough to see if it would avoid more intricate details when using the larger tool.
nothing to diagnose now, your initial explanation fits the results I get out of my gcode…
I was also wondering if, by default, fusion360 prevents the selected tool from taking off too much material. For example, if I am doing relief work for intricate shapes like calligraphy, will a 10mm flat mill violate a space that will only accommodate a 2mm mill?
My current project is a sign for one of the doctors I recently rotated with. It is set up as 3/16" flat mill and then 3.23mm ball with adaptive clearing for the roughing, followed by the cheap HF diamond carbide rotary bits (1.9mm and 0.7mm) using parallel for the finishing passes.
Do we have a repository of known tools assembled somewhere? If not, I’d be willing to share my toolset, although it is rather limited… I was waiting for a 3D print to finish one day and took my micrometer to all of the mills, lollipops, and spiral cut bits I had… Fusion360 is so awesome, I am surprised there is not a space in the cloud for tools and setups.
What feed rates do you use? I stick with 800mm/min and 300mm/min plunge rate. Have not really pushed the speed limits of my machine except when using the laser or plotting pen.
I don’t know of a place to share tools. My collection is very limited too. Basically the two end mills I mentioned and a chip breaker that I haven’t used yet.
I will be adding a thread mill to my collection and some ball mills soon. Possibly even a 60* engraving mill.
I haven’t messed with feed rates either. I’ve tried a few different DOC, but I’ve left the feed rate whatever HSM’s CAM defaulted to. I think it’s running at 40 in/min, but I’ve also only cut 1/4" plywood and particle board. At 40 in/min I can cut a .1" DOC. I’ve tried .15" once or twice. It cut fine, but had just the slightest chatter occasionally.