On the About page, I see that I have:
Frontend: 4.0.996
Backend: 4.0.136
Problem description
We want to mill on chocolate, mainly names, the dimensions of the chocolate about 36 mm by 36mm so maily the milllin area will be max 30 mm.
what should be the parameters?
Tool Speed? Final Cut Width? Step Over? Cut Rate? Segment? Tool Diameter ?
Note: I am very beginner in the topic of CNC and mining.
System description
I have a chinese CNC machine :4 Axis 2.2KW USB CNC Metal Milling Machine Water Tank CNC Router 6040
It has NAME_OF_FIRMWARE version VERSION_OF_FIRMWARE installed
according to my first tries, if we engrave more than 1.5 mm the result doesnāt look good maybe I did not set the parameters well.
I am working on the other parameters,
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Chocolate seems like quite the challenge, since you need to keep it cold, but if you cool it too much it will ābloomā and look bad. Not a lot of margin for error there. Iāve never done this, so all I can do is say what I would do if I were trying this!
I donāt know what tool you are using, but I expect that a sharp single-flute endmill with aggressive rake and large relief would work best. Iād think about it like plastics that soften easily when cut, like polycarbonate. If you use a bit optimized for polycarbonate it might work.
A slower spindle speed (larger chip load) might help keep the chip size larger, improving chip evacuation and reducing heating and smearing; you want chips not dust I think. I would think you would want visible curls of chocolate rather than dust. You might want chip load of Ā¼ of your tool diameter or so ā slightly less than the flute depth. I would also expect that Iād want at least Ā¼ my tool diameter for depth of cut in each pass, and I would experiment past Ā½ and take the deepest passes that worked.
What are you using to evacuate the chips? Vacuum? Compressed air?
How cold is the chocolate, and how are you keeping it cold?
Gummy plastics typically require very sharp tools with high rake and relief angles. I suggest that chocolate is likely similar. I strongly suggest single-flute because it will give more space to evacuate chips.
I would start with compressed air, and maybe do both; jet of compressed air to move the chips away from the bit and vacuum to keep them from settling into the face of the chocolate.
āTungsten Carbideā would be the material. Carbides are stiff (and brittle) and the material wonāt matter for chocolate, honestly, though the coating might. But anything optimized for plastic will have a polished surface, I think.
Hereās an example of what I would suggest instead:
Here are things you care about from the feature list:
High rake, high relief design produces sharper edge for improved shearing action while transferring heat into the chip
Large flute valley creates room for the chip and aids in chip evacuation
High flute finish resists chip welding
However,
Slower helix reduces lifting forces
If I were specifying a custom-ground endmill for chocolate, I would probably choose a faster helix to promote chip evacuation. But this is not a mainstream use of endmills, so you just get the best you can.
If twice the diameter (about 1.6mm) would work for your application, I would consider this bit instead, optimized for soft plastics (not available in the .8mm bit):
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