Thread: machineing radius edges
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06-10-2017 #1
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!
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13-10-2017 #2
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?
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14-10-2017 #3
Removing the bulk of material could be done with a TCT wood cutting router bit shaft sizes go up to 12mm, could the transition be finished on a lathe.
Phill
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15-10-2017 #4
I had a go at machineing the keyway yesterday with my less than perfect cnc designed for cutting polystyrene and although I had to go very slow and I only took 1mm cuts it did get the job done quite well, it would have been even better if I had a long enuff bit too.
Now I just need to find some one with a machine that can do the radius a bit better.
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15-10-2017 #5
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15-10-2017 #6
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14-11-2017 #7
Update: I took the part to a proper machinist and its taken 4 weeks for the guy to put the radius on the corners, I get it back today and my attempt on my x2 mini mill was better! I think 1 out of the 4 sides is ok the rest he has not got the full radius on and one of them is a mile out its hardly touched it! so frustrated I wasted so much time waiting for the guy to do it let alone the £20 I still got charged.
so back to square one! looks like im going to have to try and do it on my cnc but just use a very small step down and then Finnish it by hand.
so the question is whats the best way to machine it like this? running down the length or short vertical passes?Last edited by charlieuk; 14-11-2017 at 11:51 AM.
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14-11-2017 #8
The answer depends on your machining strategy, are you using a corner rounding cutter?
If using an End Mill then I'd go with linear cuts with a square endmill to rough it out to fine steps quickest then vertical passes with a ball end mill to best smooth the corners.
At the size transition step can you get away with a groove around the part? Thus allowing it to fit flush to the step edge but eliminating the machined transition from the rounded corners at the step size transition?
- NickYou think that's too expensive? You're not a Model Engineer are you? :D
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14-11-2017 #9You think that's too expensive? You're not a Model Engineer are you? :D
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14-11-2017 #10
it was a 25x25mm bar and he said he just clamped it in the center so it obviously just defected, and he rotated it around to do each side rather than just clamping it properly and getting it lined up and do one side then just jog it over and do the other. Oh well im hoping I can re use the bit of stock he messed up as at least its not under sized I don't think. All the more reason to build a better machine myself.
I cant use the corner cutter I got as it will not fit in er20 collets so going to have to use a straight and a ball nose.
I don't quite understand the last bit your saying but the part has to fit down a tube with a fairly tight tolerance.
many thanks
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