Finally got a chance to repay the guy who picked my Desktop up from the shipping terminal in his truck and helped me uncrate.
Bedroom door sign for a 6yr old girl who likes snakes and frogs(Yuck).
Decided to dial in a new Kyocera .25" 90VBit- quite dismayed to find "waterlines" I could catch a fingernail on(barely).
Remembered a thread by Paul Z for testing the actual angle of a VBit and downloaded the file. Had scrap on right of Cherry for the test if I re-arranged them.
Cut first at an included angle in tool database of 90 degrees and got the same as the carving. Then changing only the angle of the bit in the database, I went from 85-92 degrees. 88 degrees was better.At 86 degrees I was getting toolmarks from the outer diameter of the bit when it went to clean up the corners. at 92 degrees waterline was worse.
Also tested at 40% faster feed/speed and pass depth as I always feel I'm cutting slow compared to you guys even though chips and bit temp say otherwise. Didn't like the idea of sanding this kind of thing though--so just letting the machine do the work while I do other stuff.
I thought the 87degree included angle looked best, so changed that in the database and decreased pass depth 30%( so any new marks would be at a different height from originals) and rezeroed .006" (not enough to eliminate old marks )lower.
Only "waterlines" were the originals MUCH reduced and NO new ones BUT it's a much more intricate cut than the test triangle and many more passes, so you'll see toolmarks in corners so I'm TOO steep now. I'll change to about 78.8degrees next time I use the bit.
By then it was getting late, so was going to recut this morning BUT idiot me shut down, and any cut now would have been a hair off--Oh well next time.
Interesting though are the toolmarks from 85-87 degrees as they are the same exact marks I get from my Vortex .25" 60 VBit that drove me so nuts doing deep cuts I stopped using it and used an Onsrud 60 engraving for those cuts. I bet if I dial in 62-63 degrees on the Vortex they'll disappear
I KNOW the right way is to have a VBit that is large enough to do a full pass afterwards, but money is tight and working with what I have.
Hope this is of some help to somebody.
Thanks Paul--You helped me!!! Again
"Never time to do the job right the first time,"
Always time to do it again.