Thanks to everyone for their suggestions.
Well, I got a chance on Friday to try out a tapered bit. This is an onsrud 1/4 shank upcut with a ball nose. The results were not the best and I wonder if anyone has any suggestions about what to do differently.
But I fear I may have other problems. I read about problems with chatter, but the cuts that I made are wobbly has all get out. I did 2 ips at 12k Rpm and then went down to 1.5 ips and 1 ips at 14k rpm and then did .5 ips at 14k. Thanks for the suggestions for feed and rotation, Dave, can you check out these images? I'm guessing you get better quality from yours if you have it dialed in.
These are 1/8 acrylic mirror on the bottom, 1/8 sintra mounted to protect the back. Most of what you see is sintra, but it gives a good idea of variation of line. All but the 1/2 ips is pretty unusable, and that is not what I would consider great.
Unfortunately another user broke our o-flute bit, so I have to wait to try that.
I don't know whether the images will appear in line or not, but here are some pictures.
These are named with speeds.
There is also one showing how the plastic dust sticks in the cut. I had our vacuum table on with all the dust removal working.
I would still really appreciate any further guidance you all have. I can't work on this but every couple of days, but really want to get to the bottom of it!
Thanks
Peter
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