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View Full Version : What I did this weekend



Mark Hockett
03-03-2008, 01:42 AM
My friend wanted a new fishing weight mold for making some kind of lure. He sent me a blank mold frame and I machined 6 cavities in it.

http://i24.photobucket.com/albums/c10/mahockett/mold5-1.jpg

http://i24.photobucket.com/albums/c10/mahockett/mold2.jpg

Each cavity took about 50 minutes on the CNC mill. I started with a roughing pass using an 1/8" ball nose end mill running .020" step over parallel passes across the width of the cavity leaving .010" stock for finishing. I then stepped down to a 1/16" BNEM and used .010" parallel step over passes in the same orientation this time leaving .003" stock for a finish pass. The final finish pass was done with a .040" BNEM with .003" step over passes in the same orientation. Normally I would mix up the direction of the passes but didn't feel it was necessary on this mold. Here is the finish right off of the machine,

http://i24.photobucket.com/albums/c10/mahockett/mold7.jpg

Using the .040" BNEM with a .003" step over leaves a .00006" scallop on the bottom and .00011" at a 45 deg angle so the finish is very nice and will require little addition hand finishing if any at all.

The reason for the .040" BNEM as the final tool is the smallest cavity is a .0225" radius so the .020" radius on the EM worked just fine.

Here is a picture of the completed first half,
http://i24.photobucket.com/albums/c10/mahockett/mold3.jpg

The mold still needs a recess area cut into it where the hooks will sit, but my friend just got a new mill and said he wants to do that.

He better invite me to go fishing after all that work.

Oldbrock
03-03-2008, 02:07 AM
I'm an old fart and only had a little time on a little cnc lathe. I taught the students to program it ( best way to lean something is to have to teach it) I am still totally impressed with the capability of these machines and if I were ten years younger I'd get into it. Being retired I can,t justify the expense. Guess I'll leave it to younger talent. I see you got paid:D Peter

Your Old Dog
03-03-2008, 06:59 AM
The mold still needs a recess area cut into it where the hooks will sit, but my friend just got a new mill and said he wants to do that.

Now it's his turn with a new mill? LOL If that were me it'd have disaster written all over it. If he screws it up he not only should take you fishing but buy you a boat to bob around in !!

Nice job, I must look like Kermit the Frog when I see what you guys do with your cnc setups!