TEST C-108
1010 STEEL
4.4" Drilling Depth
1000 PSI
We center drilled for a spot drill. We then took a .3438 diameter drill and ran it into the hole 2.3" depth at 10000 RPM -- 900 SFM -- .005 per tooth. We ran this at 100 IPM. This was a carbide TiCN coated drill. Figure (A) top drill.
The second drill we used was a high-speed steel drill that was also .3438 inches in diameter and a flute length of 5" figure (A) bottom drill. We ran this drill the remaining 2.1" depth at 3000 RPM – 270 SFM -- .0033 per tooth – 20 IPM.
We recommend using the following method to drill the second hole with the long flute drill:
Enter the pre-drilled hole with the coolant already on and no RPM’s at a feed of 25 IPM to a depth of 1". Turn the spindle on to 3000 RPM, feed to 2.1" depth at a rate of 28 IPM. Feed to a depth of 2.55" at 20 IPM feed. (this is your first cut with the long flute drill)We then rapid back up to -.6 (remain in the hole) then go back down to .100 above the last z depth. Peck drill at .250 till your z depth reaches 4.05" total depth.>** When your drill comes back down to 3.95" depth (.100 above last z) turn your RPM’s down to 1000 and move your feed rate down to 9 IPM to your final depth of 4.4".Figure (B) shows the condition of the drill after drilling 100 holes and figure (C) shows the chips formed by all three drills.
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Test cut results for other materials are also available upon request. Call us today with your material and type of operation- AND- Let Us Save You Time And Money!
Speeds/Feeds Low & Medium Carbon Steels
