machineing radius edges

[magicniner]

But how do you transition from one size to the other with a radius cutter?
I suppose you could clean the transition up with a file?

[m_c]

But how do you transition from one size to the other with a radius cutter?
I suppose you could clean the transition up with a file?

He only asked about the radius edges, not the stepped bit ;-)

It all depends on the quality of finish required.

[magicniner]

[charlieuk]

cool wasn't aware you could get something like that for metal, I was searching for round over bits but only found wood type ones. I may be able to put that in my x2 mini mill just. I can get away with not having the step for the prototype . I guess the best way to get that would be on a 4 axis machine, if anyone thinks they can cnc this if its not going to cost a fortune just drop me a pm

many thanks

[Neale]

Are the radiused edges purely cosmetic, or is sizing critical? You could start with a round bar chosen to give about the right radius on the corners and then machine flats to form the faces? Not sure how you would then handle the stepped-down section; personally I would probably stick the bar in a 4-jaw chuck and turn the corner off on a lathe. CNC isn't the only answer! Be interested to hear how you solve it in the end.

[charlieuk]

its not 100% critical I'm making another part that this will slide into, I was wondering about getting a 4 jaw chuck for my lathe and doing exactly that but I drew it up and it just didn't look nice at all so left that idea. I had also considered trying to find some 8 sided hex. bar but that doesn't seam to be easily available. I really must get on the case of building a better cnc to do this sort of work although it looks like that will now have to include a 4th axis!

[charlieuk]

so I purchased the bit but didn't realize er20 collet doesn't go up to 16mm so I had a try on my X2 mini mill however it was a bit of a struggle for it and it didn't turn out perfect, just wondering if anyone in the Sussex area had any sort of machine that would take the bit and could do any of the machining for some beer tokens?