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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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How Much Contact Surface for an R8 Taper ?
A buddy of mine called me yesterday saying he was having some troubles
seating tools in his new bench top mill. I stopped by to see if I could help and I found there appeared to be only a thin ring of contact surface very near the large end of the taper on every tool and collet. So little that tools tightened down HARD just fell right out when the draw bar was loosened. Its supposed to be an R8 spindle and came with a few R8 tools. So how much contact surface should I expect to see between and R8 spindle and an R8 shank tool? I have had one mill with an R8 spindle and if I had tightened a collet into it as hard as I had to to tighten tools into his mill it would have taken several hammer blows on the draw bar to knock them loose. This is my buddy's second mill with an R8 spindle and tools he was struggling with on this one seated easily and worked just fine on his old one. I wondered if maybe he got a spindle with an MT taper by mistake but my uneducated finger says it feels like the wide taper angle of an R8, and not the shallow taper angle of an MT. I do have some misc sizes of MT taper tools for my lathe. I guess I could head over and see if they are a better fit just to be safe. |
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