Leon (in 9Z4Cf.16013$ firstname.lastname@example.org) said:
| || For spiral bits, buy aluminum cutting end mills. Work great, are || often cheaper and have a size tolerence of +0 -.001. | | Not to mention that they stay sharper and hold up better than | carbide tipped. I was plunge cutting 3/8" wide, 3/8" deep and 1/5" | long slots through 3/8" thick Ipe typically 200 at a time. After | 400 cuts the carbide bits were toast. After 600 the end mill bits | still looked and cut like brand new compared to the carbide bit. I | was using 4 flute HSS end mill bits.
I've also had good experiences using end mills. I recently got a batch of standard length 3-flute center cutting carbide mills from KBC Tools (http://www.kbctools.com catalog #1-330-008 and #1-330-016) and really like 'em.
-- Morris Dovey DeSoto Solar DeSoto, Iowa USA http://www.iedu.com/DeSoto