They are props for a scale model they were running tests on. Material is nickle aluminum bronze. The surface area was the only important dimension.
the facets on the blades matched the solid model. The taped hole in the center is a 4-40.[/img]
some props I made at work
Moderator: Harold_V
some props I made at work
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There is 1000 ways to skin a cat
Some people grind a tool and work all day, some work all day grinding tool.
There is a difference between scratching your a__ and tearing is to pieces.
Some people grind a tool and work all day, some work all day grinding tool.
There is a difference between scratching your a__ and tearing is to pieces.
The customer gave me a 3D file (stl. file) I loaded is into my cad cam software (ESPRIT). In Esprit I can define my tool and machine and out put nc code for my cnc mill. In this case I turned the blanks in a lathe and made my hubs 12mm so that I could hold them in a collet block. Then holding them in the collet on my mill I dialed them in. Next I centerdrilled and drilled a hole threw the flange between the prop fins so when I flipped the part over I could locate the orientation of the fins. Then using .187 end mill I z level Finished them witch means I run the end mill around the fins say at every .005 thou on Z. If you can imagine a topographical map. the software will leave a stock allowance on them so these lines will be removed with finishing operations. I then used a 3mm endmill and then a 2mm extra long series end mill . This time spiraling in from the tips of the blades to the hub. Next I had to flip them over in in the collet chuck and dialed in the hole I had drilled from the other side. Then I rotated my solid file to the same orientation as the work in my machine and produce the code for the back side of the fins.
Now I knew that I would bend the fins with the pressure from machining so I made a ring that would set on top of my collet fixture and act as a dam. Then squirted hot glue behind the fins for support. Yes there was some snickering in the shop when I came in with my wife's glue gun but it worked perfectly. All that was left was to peel of the hot glue witch released in hot water and turn the radius on the hub.
Now I knew that I would bend the fins with the pressure from machining so I made a ring that would set on top of my collet fixture and act as a dam. Then squirted hot glue behind the fins for support. Yes there was some snickering in the shop when I came in with my wife's glue gun but it worked perfectly. All that was left was to peel of the hot glue witch released in hot water and turn the radius on the hub.
There is 1000 ways to skin a cat
Some people grind a tool and work all day, some work all day grinding tool.
There is a difference between scratching your a__ and tearing is to pieces.
Some people grind a tool and work all day, some work all day grinding tool.
There is a difference between scratching your a__ and tearing is to pieces.