![]() ![]() Would you be comfortable turning on a lathe that had a 2" bar sticking 8 feet out of the chuck, with no tailstock? And if you did Listen to them or their charts and crunch your own #'s, there are also quiteĪ few feed speed calculators you can buy, several made by members here. Cutting tool manufacturers make cutting tools, they know how to run them. CAM program makers don't makeĬutting tools. I also wouldn't trust a CAM system for feeds and speeds, they should be able to be edited to spit out the #'s that YOUR tools run at. If you programmed that, be thankful nobody got hurt, then go clean a sump (standard machine shop punishment). Only after you take everybody out for mexican food and cheap beer. If your machinist did that I'd kick him in the nuts and make him scrub every sump in the place with a tooth brush, then the bathroom, but If your "programmer" did that, I'd send his ass down to the shop floor for a few months and make him take a physics class at the localĬommunity college. That warning label is what you just did with a drill. One will be picture of a BENT piece of stock sticking out of the ass end of the machine, A big red X and a Take a walk down onto the floor of the shop, look at any lathe you have that was made in the past 20 years. You were hanging out almost 50:1, and thought you could get away with 7000 rpms. ![]() Is this correct? Something like:Īny other advise for the deep drilling is appreciated.ĭaen, this would be the text book reason that I firmly believe that there should not be "programmers" and machinists. However, I also read that a "P#" can be added to the G83 pecking line with a time value for the dwell. I don't see any way to set this in FeatureCAM. I read on another post here the idea of adding a small mount of dwell at the bottom of the peck. So, at what speed/feed would you recommend for the long bit? Also, when retracting the bit after each peck to clear chips would you come completely out of the hole or leave the bit tip just inside to help maintain alignment? I'll have to inquire with the machinist if you need specifics on the collet. Assuming a little wiggle in the 6" long bit. However, the extended length bit was loaded and came up to speed and snapped off before even touching the part. The jobber bit operations worked normally. We are planning on using an aircraft bit for that last inch. We followed on with an extra length bit which will drill down to about 5" deep. We started the holes with a standard Jobber bit. Deep Hole pecking planned for all the operations. As a result the cobalt drill is continually drilling into hardened steel.We are drilling some #30 holes in 6061 to a depth of 6 inches. The cobalt drill, with its thick web, cannot be fed at a fast enough rate to cut beneath the area which is hardening. This means the drill is cutting softer steel. A Magnum Super Premium drill with its thin web will penetrate the work hardening stainless fast enough to continually cut beneath the chip which is hardening from deformation. The web on a Magnum Super Premium drill can be thinned considerably due to the toughness of the steel. Magnum Super Premium drills are made of special Hi-moly tool steel, which is much tougher than cobalt steel. This web is necessary to limit breakage of the brittle cobalt steel. ![]() Cobalt drills, manufactured to Type J NAS907 specs, has a very thick web. This performance advantage is the result of construction differences between the two types of drills. ![]() The Magnum Super Premium drills will substantially outperform cobalt drills in work hardening stainless steel applications. Machine Time (seconds) = (60 x Feed minus Stroke) / I.P.M.Feed and speed rates should be reduced up to 45-50‰ when drilling holes deeper than 4 drill diameters.Speed equals 80 surface feet per minute in 100 Brinell hardness material and the speed should be reduced 10 surface feet per minute for each.001" per revolution for every 1/16" of drill diameter, plus or minus. NOTE: Varying conditions can easily require adjustments. The following tables contain guidelines which can be utilized when Drilling Standard Materials.Īlso, the following " rules of thumb" can be used to determine proper feeds and speeds for drilling ferrous materials America´s Finest High–Speed Cutting Tools™ĭifferent drilling conditions make it impossible to develop any rigid rules for feeds and speeds. ![]()
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