3. Computer controlled machining
This week we used CNC milling machine to cut something big from plywood. Cut CNC test together.
Documentation
Creation
- Designed using Rhinocerous, inspired by gothic arc.
- Used usual Rhino commands: polyline, fillet edge, extrude, move, 1D scele and so on.
- Set matetrial sizes and Z-axis origin referring to material.
- Setting tab for 6mm diametre flat tool (for plywood using down cutting milling cutter).
- Pocketing of joint holes, setting speeds.
- Pocketing safe plane setting tab.
- Pocketing cuts preferences and depths.
- Pocketing preferences of entering and exiting material.
- Set minimum distance tool optimisation.
- Axis Profiling Exit / Entry settings have to be Along Path to not destract exterior material.
- For Engraving (screws pointing) safe plane should be twice higher, because when material not screwd, it is more curved.
- For Engraving Exit \ Entry settings shouldnt be defined, to make only Z-axis movement.
- To make algorithm for CNC need to Post slected cutting trajectories in correct order.
- Machine ON by turning switcher.
- Changed tool and clened collet.
- Placed material, put collibration button on material.
- Started programme for screws, screwed.
- After collibrated Z-axis again (screwed material more plane).
- Started to cut
- Bridges done well.
- Simulation corresponds to cutting process and looks good)
- This plywood quite soft,easily cleaves.
- Air pump ON.
- Mostly done.
- Tried to pump by vacuum cleaner, after used air pump.
- Used chisel and hummer to break bridges.
- Material was 15 mm, not 10 as I thought, so joints holes were not correct.
- Next day I changed sizes of holes and height of shelf ot arrange it on least material piece.
- Changed tool.
- Collibrated X, Y and after Z-axis Origin position.
- Checked that coose correct file on screen.
- Screwed.
- Recollibrated Z-axis.
- Started to mill now holes have correct size, depth defined well.
- Remembered that need to switch on pump.
- Prosessing...
- Mostly done.
- Unscrewed.
- Vacuumed major part of chips.
- Cutted bridges by hummer and chisle.
- Now cutted well.
- Done. Actually milled not perfect, plywood too soft, chip off because of that.