Ok that is exactly what I ended up getting. I was mostly happy with the results. Still ended up with lots of hand cleaning after the fact as lots of little plastic buggers were attached.
Not sure but you/he may be thinking of/happy with a 60 degree V-bit which has a 30 degree slope on each side. Same as many call a 90 degree v-bit a 45.
I have met with Ron Reed of Think and Tinker (Precise Bits) and he is very knowledgeable and helpful and would be an excellent source for the bits.
That said, I have also had excellent results from an eBay seller named drillman1. I bought some 30° bits from him, American made Kyocera brand, at a great price : http://m.ebay.com/itm/5-30-degree-a...3Ac775581d15b0aa415d891c7efffd4ce3%7Ciid%3A10
When I had my cnc group over on a shop tour, I passed around one of the 30° Kyocera bits and a 30° Precise Bits and no one could see any difference in the grind.
I would always suggest using spiral v-bits over any brand of straight 2 flute v-bits.
I really can't answer that as I haven't yet broken or worn out any bits of any manufacturer. My cnc is a DIY build of my own design. One of the first things I carved was the infamous Aztec calendar. Just under 3 hours carving time using the 30° bit and there is no perceptible wear and it still feels very sharp.
The piece was a 48" x 70 " HDPE carve for use as a mold in concrete.
The words were all Mirage image and the author used his own language.. Go figure. so the onty way to create the Model was to use the "trace bitmap" tool. The lines were very clear.
I initially submitted a sample using a 90 degree bit and V carve tool paths .2" thick. The result look nice and pulled out of the concrete cleanly . They had earlier tried a molding using Vertical wall letters.
the museum asked for us to go to 15 degree bevels instead of 45 _ from the 90 degree V BIt.
So I bought a 30 degree bit. The best thing was the gap on the bottom of the letters was now over .25" so I could use a .25 end mill instead of a .125.
The V Carve Pocket carve had 284000 vectors and carved in 6 hours at 100IPM.
the V carve tool path had 864000 vectors and carved in a little of 13 hours at the same speed.
There are apparently 15 ore of these to be made. IF the museum is happy, than I need to get better at carving HDPE. Had a few other glitches carving it, but all in all it carved clean.
A bit that I've had really good luck with for V-carving is CMT 60 degree. This link is for 1/4" shank but they also offer 1/2" shank. I use both but prefer the 1/4" shank because it's easier to switch bits with the projects I do.
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