05-11-2020, 10:48 AM
(05-11-2020, 02:00 AM)awemawson Wrote: Why can you not modify the end of a reamer grinding it flat, or alternatively make a ‘D bit’ From a bit of silver steel (drill rod US speak) turned to your desired diameter and filed to the D form ?
Andrew,
Both good ideas. Will keep them in mind. Thanks. Just took a few minutes out in my cold shop to check the 5/16" 4 flute end mill I used and the new one I will use on the next mock-up. Checked T.I.R. of shank w/n 1/4" of collet and it was .0000. Checked 4 flutes approx. 1/8" from end. Zeroed one - found 2 measured -.002 and 4th one measured -.0035. Sounds like a worn end mill, as expected. Installed new (unused) one in collet and it read .0000 on shank. Moved down to flutes as before and it read less than .0005 total variation for all 4 flutes. So. If my fixture mods. minimize vibration and the new cutter using WD-40 for cutting fluid all work, as suggested by the great guys on the forum, maybe the old, short, fat guy can make 60 good ones. Plan to run a couple more mock-up pcs. this weekend. Will let you know how I make out. Thanks again for everyone's help & suggestions.
Don