200 5/16-18 304SS

[EazyE]

Alright i need to drill and tap 200 5/16-18 holes in 304ss 1/4 deep down to 1/2 deep(inches)these are all thru holes. I do not do much SS so i am here for some advice. What type of drills and taps are rigid enough to cut down on breakage and some speeds and feeds would be helpful at least for a starting point. these will be done on an older VF2 prob not the best choice but only one avail. Also I have some floating tap holders but have read (somewhere) that the spd and fd have to be adjusted for the engagement and float of the holder.. I am sure there are some people that can help , I hope. Thanks ...

[Bryan Johnson]

if your Haas is set for Rigid tapping, I would not bother with adjusting the feed for the floating holder.

[3R!< W3NG3R]

I love the OSG gold SUS for SS drilling. One drill should do all the holes in 304.

 

A roll form tap would work well for this also.

 

HTH

[Guest]

roll form is good advise if you can as chips from this stuff can be a challenge (with a cut tap)as it is tough material (not hard).

if you do not have rigid tap i think the feed adjustment refered to is to slow the calculated feed just a little. this will load the floating head a little to insure tap is out of hole before traversing to the next.

hss tap should not have a prob with 300 rpm, then bump from their.

use tapping fluid if possable.

Doug

[Goldorak]

11 for OSG drills they ca easily make 3000 holes in SS304

 

for taping , Emuge roll tap is the way to do and boost your coolant concentration a bit to avoid tap to stick in the hole

 

and also make shure taht the hole is clean begore tapping

 

i also use tapping grease(Jokisch) , the machine load simply drop by 25% and toollife can easily triple

 

but you got to take time to put grease in every hole before tapping

[strabe]

I highly recommend Blaser's Blaso-Cut CMP Tapping fluid. Cut or roll form, your tap life will increase big time. Jokish is good too.

[chris m]

I would run a Guhring High Performance 5514 series drill and roll tap it with an OSG ExoTap. Guhring has pretty incredible pentration rates with these drills and life has been very good for us in PH stainless. The ExoTAP NRT works beautifully in stainless as well.

[EazyE]

Great responses , thanks allot people. I will let you know how i make out . It will be a cpl days.. A big thanks to everyone on this forum.

[The Fastmill]

?.... A good thread mill would do all of the holes...

 

I do this all the time and seems to be much better than tapping in 304

[The Fastmill]

?.... A good thread mill would do all of the holes...

 

I do this all the time and seems to be much better than tapping in 304