gustafson
Diamond
- Joined
- Sep 4, 2002
- Location
- People's Republic
So as part of my work, for a very long time, I drill a lot of holes in 6063 extrusion. Drill tap #6
Suddenly after drilling, literally, millions of holes, I am dealing with drill breakage problems. Started with a new batch of a slightly heavier extrusion I run, but I moved onto a different job with a lighter extrusion that ran fine, ~5k holes no real issues.
Ran a job that I have run for, oh, 20 years, using the same extrusion from the same supplier the last 20 years. Same drill I have been using for 20 years[Guhring parabolic stub]. In the middle of a package of drills that I bought a year ago. Same coolant I have been using for 19 years[Blaser 2000CF]. Same program I have run in the same machine I have run them for the last year.
Machine: Brother Speedio S700 27K, 13 months old
Sk toolholder, no significant runout
Coolant 13 percent a bit rich but that ought to help
Feedrates 100 percent
Program is stored in machine, unchanged, feedrates consistent with every other program doing the same thing
Ran ~20-30 parts, broke a drill. OK, it happens, change drill
Breaks after 4 holes
OK
look at coolant, add some, its full, but clean screens and pressure seems better. Mentally compose post to 'check your Speedio coolant screens'
10 holes break drill
Swap in carbide drill I had been playing with on previous job[so maybe 50-100 holes]
12 holes, break drill
Swap back to previous. Change to brand new ER holder
2 holes break drill
Lower feed 40 percent, peck drill
5 holes break drill.
These are 9 dollar drills that usually last months, many thousands of holes.
Finally I go look up an old program and dial the spindle down from 20k to 5 and the feed down to what I ran on the old machine.
Run 100 parts
Now on these parts it is only costing me a couple seconds a part to slow down the spindle, but I run parts that have a lot more holes and it will add up.
Ideas?
Suddenly after drilling, literally, millions of holes, I am dealing with drill breakage problems. Started with a new batch of a slightly heavier extrusion I run, but I moved onto a different job with a lighter extrusion that ran fine, ~5k holes no real issues.
Ran a job that I have run for, oh, 20 years, using the same extrusion from the same supplier the last 20 years. Same drill I have been using for 20 years[Guhring parabolic stub]. In the middle of a package of drills that I bought a year ago. Same coolant I have been using for 19 years[Blaser 2000CF]. Same program I have run in the same machine I have run them for the last year.
Machine: Brother Speedio S700 27K, 13 months old
Sk toolholder, no significant runout
Coolant 13 percent a bit rich but that ought to help
Feedrates 100 percent
Program is stored in machine, unchanged, feedrates consistent with every other program doing the same thing
Ran ~20-30 parts, broke a drill. OK, it happens, change drill
Breaks after 4 holes
OK
look at coolant, add some, its full, but clean screens and pressure seems better. Mentally compose post to 'check your Speedio coolant screens'
10 holes break drill
Swap in carbide drill I had been playing with on previous job[so maybe 50-100 holes]
12 holes, break drill
Swap back to previous. Change to brand new ER holder
2 holes break drill
Lower feed 40 percent, peck drill
5 holes break drill.
These are 9 dollar drills that usually last months, many thousands of holes.
Finally I go look up an old program and dial the spindle down from 20k to 5 and the feed down to what I ran on the old machine.
Run 100 parts
Now on these parts it is only costing me a couple seconds a part to slow down the spindle, but I run parts that have a lot more holes and it will add up.
Ideas?