feeds, speeds for 316 S.S????

[buck30]

so i need to drill about 1000 .020 dia. holes through some 316 S.S tubing. Wall thickness is .025 and i need to go through the wall. Anyone got any ideas of feeds and speeds??? would love to get all the holes done in just one drill but not sure that will happen.

Thanks in advance folks.

[Hardmill]

A .5MM ball endmill would prolly work alot better than a drill on tubing.'

 

Otherwise id say a carbide circuit board drill.

 

How much RPM you got ??

 

 

PEACE

[buck30]

i have got both .02 ball endmill or carbide .02 drill. Think my max rpm is 23 000 (robodrill)

[Hardmill]

Max rpm (only 120 sfm) start at .0002/.0005 chip load

 

 

PEACE

[horsepowered]

Buck,

 

I had a similar job a few years back 316 s.s. with .019 holes thru .030 thick material. Each part had 50 holes. I used a Guhring 660 tin coated drill drill h.s.s. size was .490MM. I spotted with a 4mm x 90 titex h.s.s. uncoated spot drill. Ran 8000 rpm with 3.3 ipm feed. I was changing drills at 800 holes. Drill as well as spotter were running absolutely true. I also was running oil in the machine at the time not coolant. With coolant no dought the results would be different but the Guhring drill way out performed any other that I tried. HTH

[Dave.L]

I don't know if they make them that small, but double margin drills are great for break thru conditions which will hurt the tool.

[buck30]

drills i got here (left overs from another job) are Sphinx .52 mm carbide. Think thay came from SPI. Anyway will give them a go since they already here.

guess i will start at 8000 rpm and 3 IPM see how that goes.

Just been told that "as little as possible inside burr please" lol see how that goes lol

[horsepowered]

It would be time well spent to ensure that those drills had zero runout! Also be sure that the spot drill has zero runout. With just a little runout on the spot drill it can create a cone in the center making the drill lead of right from the start.

[horsepowered]

The reason that I liked the Guhring drills was that they have a .060 shank necked down to the drill diameter with short flute length about .150 long. Very tough drills.