Maslow in GrblGru “rolling rib” tutorial, with no graphics, as I am only allowed one per post, and it’s a lot of work to add pictures!
Download the beta version of GrblGru which contains the embedded Maslow machine from here:
after installing GrblGru beta with maslow:
open and select Full GrblGru Version
goto extras->machine manager
in the top line use the pulldown menu to select maslow at the bottom.
Once you do that it will go back to the first screen with the maslow machine showing. You can click the large yellow question mark along the top right to clean up the graphc panel showing the Maslow. I’m using my laptop at the moment with a touchpad, so holding your right mouse or touchpad button you can rotate the machine in 3d.
Looking in the graphic window shows a tool tip height at 69.29. The author of GrblGru changed the coordinate system back to the rear of where the default frame plywood would go, therefore the sled base is at 38.1mm. We want to move the tool tip to the base of the sled, therefore in actual workposition, enter (69.29 -38.1) or “-31.19” in Z, then click origin. Each time you open GrblGru you will have to “calibrate” the actual workposition like this. Since the maslow sled rides on top of the sheet material, the base of the sled should always be the reference. If you change the length of the tool, you will have to calculate the new Z value.
Go ahead and download OpenSCAD, and install it.
I havent been able to make GrblGru reliably run openscad, but we can just run openscad, enter commands, save out the stl files and import into GrblGru just fine.
Run openscad. In line 1 enter:
This will give us a 4x8 plywood centered and 30.1 mm high, leaving (38.1 - 30.1) 8mm between the backing sheet ply and the sled, located at 38.1mm above the frame. You can preview it, then hit the Export as STL button and save as ply.stl.
In GrblGru >file->load stl-> and open the ply.stl file you created with openscad. the plywood should be located in proper position as a backing material.
In the left plane, if the graphics window is tool small, with the 3d tab open, you can click on each on configuration, tool, actual workposition, and control panel, to collapse them, which enlarges the graphics window.
Sometimes controller windows will open beneath the graphics, then just hit the show/hide controller windows button, to the left of what looks like a ruler with 2D below it. Make sure your tool tip is at the base of the sled, by zooming in on the tip of the drill, and using the different views available, front, top, side, zoom in and rotate as necessary.
I haven’t tried it yet, but at some point go to file->save project as: I don’t know what settings it saves, but get in the habit of backing your work up. As GrblGru is the work of one author, things may not work quite perfectly.
I’ll be using a rolling rib for a kayak I made a long time ago, cut out by hand. Shown here in the bottom image to the right of the coaming:
I’ll attach the dxf file.
In GrblGru goto file->import dxf-> locate rib 2d in mm.dxf and open it.
Go to the top view in the graphic area, and if you hold down the shift button on your keyboard, then go to actual workposition, you can move the sled out of the way, so you can see the 2d kayak rib. If you scroll through the different views the file should be at the base of the sled, and 8mm above the backing plywood.
Goto the “2d” tab.
Go to drawings and under that, hit the “+” sign next to rib_surface_215_9
Highlight “Toopath 0”. Right click->create job->cut mdf 8mm with 3mm drill bit.
Go down to jobs, highlight “job toolpath 0->cut mdf 8mm with 3mm drill bit”
At this point, just as a reminder, I do not know CNC, trying to teach myself the fundamentals, and get to know the simulator. Really just winging it!
Scroll down to 4. tool-> radius correction-> set to inside, click in the graphics area, and the image should change from an outside cut.
Select Highlight “Toopath 1”. Right click->create job->cut mdf 8mm with 3mm drill bit.
Go down to jobs, highlight “job toolpath 1->cut mdf 8mm with 3mm drill bit”
Do the same as above, change that to an inside cut.
Do the same with Toolpath 2.
With Toolpath 3, create the same job, but leave as outside.
Goto the 3d screen.
You may want to save at this point.
Click Show PreView, look’s like a yellow eye from the side.
Probably blew out your background ply. That’s ok, was only to learn the coordinates.
You may have multiple images of the intended 3d rib.
Try unclicking the STL file button near the Show PreView button (not the one with the ruler)
This should leave one image of the rib. No, I don’t know why this is.
In the Tool area, uncheck laser. We want a drill bit to show in the graphic area.
In Actual WorkPosition, press the Home button located in the middle of the 3d arrow controls, if you had moved the sled out of the way earlier.
Click on NC near the Show PreView button to show the calculated toolpath.
Then click on Show Toolpath, kind of looks like a snake, ready to strike.
The third mouse button (usually the scroll wheel if you push down on it), or if you hold both touchpad buttons down together the cursor should change to what kind of looks like an arrow pointing to the right acts as a pan button, to shift the view.
Go the the Control Panel area, might be easier if high speed simuation is unchecked at this point.
Hit Start, the machine will move to the upper right circle and then go down to start the cut. Hit Stop, and Exit. Zoom in on the area of the drill tip. Hard to see the forest for the tree (sled) at this point. I may redraw the sled as a hint of itself, as it is kind of hard to see the work area. You should be able to see the trace of the tool path as a yellow line. You should be able to see the calculated toolpath within the rib.
Once you are satisfied you can save the project, then save out the G Code for your review.