Micro drilling help Please

[savagkd]

Please help. We are trying to drill .013 dia. holes .25 deep in Carbon Carbon Phenolic. Using a .013 ball end mill at 30K RPM. .001 peck, .5 IPM. Any advice an feeds and speeds? Cauz it aint wurken.

[kccadcam]

Hi Keith,,,,

Why are you using a ball em?

I would try Harvey Miniature Drills

You should be able to peck 1X dia. with no problems.

[generaldisarray]

Is the material the reason you are not using a drill?With a end mill espesially a small one there is no where for the chips to go.We use MA Ford small drills down to .008 but only in metals.

[savagkd]

The reason for the ball mills is the .26 depth. We can't find drills with that length. The end mills have .03 flute length and a reduced shank for chip clearance. We have tried the #80 Harvey at .013 peck, they break on the first peck.

[Guest]

wow, i bet how ever you hold those it has to run dead balls true doesnt

[kccadcam]

You should contact Onsrud

They specialize in composites and laminates...

I'm just not sure if they make something that small.

[kccadcam]

Composite speeds and feeds

This might help also....

[savagkd]

Thanks Kevin, Onsrud only goes down to .125

I have to head out for the day. I'll check back in the A.M.

 

Thanks

[cincy k]

Try a mitsubishi micro mse drill. they make a .34mm drill with 6 mm flute length. from experience on their larger drills they are typically a little generous on the flute length. hope this helps.

[savagkd]

Got it! Ended up with Micro 100 .4 MM ball mills at 30k RPM, .0007 peck at .45 IPM. Because the carbon cloth was at a 20 deg. ply angle, the BEMs tended to follow the ply. We had to peck down to -.17, then re peck from 0 to -.24 in order to keep the holes straight, they had to meet in the center of a .5 in. round to make a through hole. The last op is re peck to -.27 with a .4 MM Harvey drill the BEMs were breaking.

Thanks for the help.

Hope this will help someone else in the future.

[X-L Engineering Corp]

Crazey-Drill From Micron is really good to.