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High Speed Precision CNC Milling
Super Quality Hand Finishing
Crystal Transparent PMMA Prototype

Diamond Cut Lamborghini Model

This is an old project we did for UN in 2013. In order to catch the budget, we made by it SLA and paint it black afterward. The result we got was ok, but not brilliant. due to the limited of SLA process. The visible building layers is the main problem. We came up with the idea to make this prototype by 5 axis milling recently. in order to find a better solution for similar kind of projects, in the meanwhile test out the accuracy and stability of our new machine.

Check Out How We Make This Prototype

Project overviews

Material: PMMA/Acrylic

Size: 233x120x58mm

CNC Milling Machine: JDGR 200

Max RPM: 32000

Finish Tool: R 0.25 sphere cutter

Surface Roughness: Ra 0.5

Programming: 2 days

Machining Hours: 58 hours in total

Hand Finish: 4 days

Challenge of This Project

For this kind of model, it is very important to keep all the lines sharp. in some area, the angle between 2 surfaces is so big which is almost 170 degrees. that means the join line is almost flat. To keep these details is a challenge of our machine as well as the hand finish. To avoid using sand paper, the overall milling roughness should be under Ra 0.6, so that we can polish it with cloth directly.

The connection material of the rearview mirrors is tiny. They will break easily during CNC machining or hand finishing. To remove plaster after machining second surface is also a difficult job.

The air inlets are undercuts, so we have to use very long small cutter.  And the edge as shown is very thin and sharp. any vibration during milling will break those edges. Our machine and tool holder accuracy is +/-0.005 mm, but it is also important for CNC operators to keep the cutter accuracy around +/-0.005 mm in the same time.

Thin Connection

Sharp Edge