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Unread 15-10-2013, 20:53
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AKA: Cory McBride
FRC #0254 (The Cheesy Poofs)
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Re: Show off your machining!

Quote:
Originally Posted by Adrian Clark View Post
Could you elaborate on how you did the surfacing on the bearing mounts?

Also, I love that yoke. I wish I had a chance to make something that complex. It looks like you chose to pre-drill your bearing bores with a twist drill then finish with and end mill. If that's what you did, why'd you chose to do it that way instead of just milling the hole?

Thanks,
-Adrian
The surfacing was done with a ball end mill. I don't remember what specific toolpath I used, but essentially when looking at it from inline with the top "ridge" the endmill just follows the contour from the side, up and over the top, and back down to the side. It then steps over a very small amount (probably .010 to .015") and repeats the same motion until it machines the entire profile.

After machining they were hit real quick with a scotchbrite wheel.

I like to pre-drill when convenient (as long as the drill is in the machine) as it eliminates any chance of packing up the flutes or chipping the edge of a flute when plunging.

I think RC is talking about the yoke for the arm, which is shown as machined. It was scotchbrited later, but the finish you see on the outside of it is from a 3" aluminum specific face mill.
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