For my job i run the spindle at 3600 rpm, the oil at 1000 psi and run the feed at about 1.25 in/min. You need to have as was stated a bushing that gets the drill started dead on and special cutting oil fed to the gun drill under pressure. 262 diameter in 41L40 in about 12 minutes without stopping. i built my own deep hole drill set up on an old lathe bed. Gun drilling is pretty easy if you have the proper set up. Here is a link to Drillmaster/Eldorado's website, read it through but the bottom seems to have some good info.įound some tungaloy information that is decent, it is in metric. Maybe someone has more or better experience, hope this helps. We got good money for the job so there was little fretting over buying new ones to make it easier, helps that the material was expensive too. We tried regrinding them and sending them out for regrinding but got inconsistent results so we ended up just purchasing new ones. We had pretty good experience with them, we replaced them every 50 pieces, so like 300 inches. I was able to get a book from them that had speeds and feeds for the gun drill I had when i was looking at gun drills. I think hard materials chip nice and work great with these. Coolant was at the top end for better lubricity. I think I remember our speed being 220 sfm and feed of 0.001'-0.0012'/rev if I remember correctly, at the end you stop the spindle and pull it out. Then you put the drill in at stop spindle at like double the diameter, turn the spindle on, turn the coolant on and drill. A very important thing is the pilot drill, which needs to be like 0.001' bigger and like an 0.75-1' deep. I used a Drillmasters gun drill it was in a lathe. The dust generated when sharpening the carbide part of the gun drill is harmful to the body, please wear protective glasses and a mask.I haven't done gun drilling in like 10 years, I did a bunch in Astralloy. In the process of gun drill, the unsupported length must not exceed 40 times the tool diameter, otherwise it will easily cause damage to the tool. It is strictly forbidden to start the drill rod spindle when the drill bit has not entered the drill sleeve (guide hole), the coolant has not been turned on, and the effective support has not been obtained the spindle should stop rotating or rotate at a very low speed below 50RPM when retracting the tool. When the size of the inner hole of the guide sleeve is larger than the nominal size of the gun drill 0.02mm, it needs to be replaced in time. The tip of the gun drill deviates from the center, and the drilling process must be guided by a guide sleeve or a guide hole. The cutting oil (fluid) should be a special deep-hole cutting oil (fluid) containing extreme pressure additives. For the pressure and flow rate of this system, please refer to the manufacturer's recommended data. When using gun drill, especially when using simple deep hole processing equipment, please protect the machine tool properly to prevent the chips and coolant from harming the human body.Ī high-pressure cooling system that meets the requirements is particularly important for deep hole drilling. No matter what gun drill equipment is used, it is recommended to use the manufacturer's recommended values for the cutting parameters of the equipment. The equipment used for gun drilling is generally a special machine, and the deep hole drilling system suitable for the transformation of lathes and boring machines can also be used.
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