bullnose drill

[HEAVY METAL]

anyone every used a bullnose drill and is this something off the shelf . print calls for bottom of hole to be sphereical. a pipe tap at top some type of water hole but it is a blind hole

[Fig sign]

iS IT DEEP ?

[Bruce Gibson]

i've programmed similar holes. if possible, use a regular drill, and then drill the bottom of the hole with the spherical shaped drill.(long or short)

[chris m]

+1 to Bruce, I would definitely drill it .005 or .010 shy and just finish it off with a ball mill or some other such spherical cutting tool; you could probably get a custom size ground by Fullerton or somebody pretty fast for relatively short $$

 

C

[HEAVY METAL]

thanks try to round something up odd ball size though 37/64 dia. hole is 2 inch deep

[chris m]

I just looked and Fullerton does full radius in that size range, you might need to relieve the shank because the OAL is OK but flute length is shy.

 

(800) 248-8315

[HEAVY METAL]

THANKS CHRIS

[flippinjig]

Heavy,

Blind holes are for cascades or baffles. .578 diameter is for 3/8 NPT, you can use 9/16 drill and pipe reamer, then tap. I drill .2 shy of depth and hand grind a ball on the end of a drill and just drill the last .2 with the ball drill. 2" is pretty shallow, on deep holes I have drilled with on size drill then balled with 1/64 under so drill would not seize in hole.

 

 

Hey, this is kinda cool. Finally I can contribute, its not easy to do when your using Ver 8.1!

 

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Wire 8.1.1

[flippinjig]

Heavy,

What kind of parts do you usually make?

[HEAVY METAL]

THANKS EVERYBODY for the input. MH we are a small job shop kinda do little bit of everything working on a cavity mold for a oil pan . dont get to do a lot of 3d stuff with molds so this job will be fun and a learning experience. i.m sure i,m going to have alot of ? on the the 3d paths goin to put file on ftp for reference under the name die cast mold

[HEAVY METAL]

the file is in the mc9 folder