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Drills breaking drilling through Grade 5 bolts
Gotten my drill life up to around 200 bolts with the method I mentioned above, which is acceptable. After the drill chipped I figured I'd just let it go until it wouldn't anymore since its messed up at that point anyway. These drills will go quite a while with a chip it seems- dnuccio
- Post #41
- Forum: CNC Machining
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Drills breaking drilling through Grade 5 bolts
It is fully retracting every peck- dnuccio
- Post #40
- Forum: CNC Machining
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Drills breaking drilling through Grade 5 bolts
I wish. Unfortunately this will be a recurring job as the customer is a friend of the owner. Might be able to get them to splurge on some higher quality hardware, but I doubt it.- dnuccio
- Post #25
- Forum: CNC Machining
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Drills breaking drilling through Grade 5 bolts
Made some progress on this. Found a Kennametal carbide drill. Running at 1200 rpm 6.1 ipm about .005 ipr, pecking every .070". Still spotting but reduced the depth so the tip of the drill is cutting before the corners. I got through a little over 100 bolts before one of the corners of the drill...- dnuccio
- Post #22
- Forum: CNC Machining
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Drills breaking drilling through Grade 5 bolts
This is exactly what we've got going on, steel plate 1 inch thick with tapped holes for the bolts. The fixturing is solid- dnuccio
- Post #19
- Forum: CNC Machining
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Drills breaking drilling through Grade 5 bolts
Update: Tried a Firex drill, 2000 rpm 12 ipm (.006 ipr) as suggested with no spot or peck and it made it about an inch deep on the first hole and exploded.- dnuccio
- Post #10
- Forum: CNC Machining
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Drills breaking drilling through Grade 5 bolts
thread length is 1 inch, overall hole depth is around 1.375"- dnuccio
- Post #9
- Forum: CNC Machining
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Drills breaking drilling through Grade 5 bolts
I've tried pecking as low as every .050" with no change in results- dnuccio
- Post #7
- Forum: CNC Machining
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Drills breaking drilling through Grade 5 bolts
Should have mentioned, I did try some carbide drills on this with little success. Guhring FireX 5/16, ran right at what Guhring reccomends (I don't remember exact feed and speed, but it was in the neighborhood of 3000 rpm and 20 ipm). Got roughly the same life out of that drill.- dnuccio
- Post #6
- Forum: CNC Machining
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Drills breaking drilling through Grade 5 bolts
i'm having a problem with drills breaking on this job. 1/2-20 grade 5 bolts, 1 inch long that I am drilling a 5/16 hole through the length of. I'm running this job on a Haas VF2. I'm using cobalt 5/16 drills, 135 degree split point at 900 rpm, 5.5 ipm in an ER collet holder pecking every...- dnuccio
- Thread
- Replies: 40
- Forum: CNC Machining