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. I haven't done gun drilling in like 10 years, I did a bunch in Astralloy.
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