I need to mill a 7º and 11º angle on the base of a round stand-off. While I could tilt the head of my mill, I'd rather not have to re-tram. What are other ways to hold a round piece in a vise at an angle for milling?
Unfortunately I don't have a collet block, but mebbe I can make something. After noodling on it, I'm thinking of taking two pieces of aluminum, clamp them face-to-face with tape or paper between them, bore a hole normal to the top, rotate the aluminum to the correct angle, and mill the top so it will sit flat in the vise when it holds the standoffs.
I do have an indexing head, so maybe just make something to clamp the standoffs and bolt to the indexing head would be easier?
After noodling on it, I'm thinking of taking two pieces of aluminum, clamp them face-to-face with tape or paper between them, bore a hole normal to the top, rotate the aluminum to the correct angle, and mill the top so it will sit flat in the vise when it holds the standoffs.
Well, I feel like a real machinist! I spent $300 on tooling and materials, and about 40 hours to save $350 for specialty hardware for my Cobra (oh, and I probably have a couple more hours polishing the stainless so it kinda looks like chrome).
Anyway, thank you for your help. I almost made a sine vise, but my little Palmgren vise's rails were too thin for 1/4" bolts, and I didn't have any smaller hardware handy. After seeing Winegrower's, however, I've added a sine vise to my list, as it would have made easy work out of today's task (and saved me probably 5 hours).
I ended up taking 2 aluminum bars, putting a couple layers of masking tape between them, and boring holes at the right angles. To drill the correct angles, I used a 3/4" drill on one side of my 6" Kurt vise which gave me close to the desired 7.3º. For the 10.7º hole I machined a spacer block out of delrin to prop up one side 1.13", giving me close to the 10.7º angle I needed.
Here are the stand-offs:
My next question is how to get a mirror finish on 303 stainless, but I'll post a separate thread on that.