17-4 ph

[MCFELIX]

hello people i have a battle with carbide drill .I need drill .200 dia drill carbide in a 17-4 ph material but my feed and speed did not work right. I used peck drilling and one shot cut also I changed to three flute drill and got 20 parts more.

please any feedback

[Gary]

How deep you going? and what speed and feed?

I drill it at 40sfm and about .003 a rev in the lathe daily. Drill 1/8 inch dia 1.5 dp. Usually 40-50 holes. This is with hss drills though.

[TOOLMAN]

I treat 17-4 PH like 4140. 200/250sfm with carbide. 60/100sfm with hsco. I always use HSCO drills on 17-4 at 60sfm (1146rpm for .2 drill) with very good results. I dont like small carbide drills. We run unattended on most of our jobs. If we run carbide drills seems like the guys on the floor always add a M00 to check for broken drill which slows down the cycle.

[ReDEyZZ]

quote:

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I treat 17-4 PH like 4140.

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+1 17-4 is pretty soft as far as stainless goes

very similar Rockwell as 4140.

[Dowty123]

Is it hardened? and how deep?

[Thee Dragracer1951]

Another thing to consider is, if it's annealed or not. If it is, It's really gummy and will give you headaches. I just ran a job across one of my lathes, oculdn't get any life out of a threader...had to HT to cond H1150. Then it ran great.

[Storkman]

Depends on the heat treating. H1150 cuts great. Others can be a real pain in the arse.

[MCFELIX]

gary my rpm 450 and my feed is .001

[MCFELIX]

toolman and jarret .with this parameter i dont get anything no even 1 pcs at the instant touch the part , it break

[Thee Dragracer1951]

Well that's WAY too slow. That's only 23 sfm or so. 200 sfm is 3820rpm. I's be about there with carbide. You haven't told us the condition of this material though...That will make a difference. I'd be in the .0025 feed range Id think.

[Goldorak]

MCFELIX check your runout

 

.001 off and the drill will snap on contact!!

 

try OSG drills they generally outperform all the other in S.Steel

[Ralph@Faustson]

MCFELIX

What is the H condition of the 17-4 H950 is a lot different than H1150 or H1025...

[connormac]

+1 to OSG VPH-GDS drill

[chris m]

+10000000 to "what's the heat treat condition?" We run 17-4 PH all day in a variety of hardness conditions and as the other boys said H1150 is the best. Even a HSCO plain-jane screw machine drill should get you through 100 holes at 40SFM with a 1XD DOC in most conditions [except really hard stuff like H900] so I don't know what the heck you have going on. I would launch that 3-flute drill in the barrel for that application due to lack of chip clearance. If you need to run a relatively cheap drill I'd be looking at a F5522 or similar from Guhring; if you want to spend $45 for a drill and plow it in there then I'd be thinking 5514 of some similar also from Guhring. The OSG is probably a fine drill as well but I do not have any experience with it. I think you guys are dreaming with 200SFM unless you have coolant thru but I could be wrong.

[chowquoe^]

We use Titex drills, in 17-4 ph h900 for your hole size they are recomending 2746rpm 7.7ipm and 274 holes that are 1.5" deep This is a coolant thru drill and +1 on the run out.

[Gary]

17-4 will only get to about 43rc if I remember.

Ares very from 37-41 rc I would run a hss drill at 770 and .003 a rev peck down about 1/2 first peck maybe .2 the next and only about .06-.08 after that and just walk away. Thats what i do and it just cuts forever. I also flood cool. I know u have carbide but are spot drilling? I would just centerdrill .08 dp then drill from my experiance.

[?Mark]

From my library (we only cut the tougher annealed 17-4ph)

HSS DRILL 35SFM F1.0

HS-CO DRILL 45SFM F1.2

 

 

.250 DIA CARBIDE ISCAR 0250-128-0250ACP3 908

180SFM .0023 IPR

S2751 F6.3

 

Keep sfm and feedrate the same

 

hth

[?Mark]

quote:

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i dont get anything no even 1 pcs at the instant touch the part

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holder????