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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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Bearings and Thrust Problems...
One of our customers with a special three spindle drilling head is having
some problems. They went out and bought a drill press that can not get the RPM / thrust settings right for a particular drilling process they need to run. Rather than buy a new drill press, they bought some tooling that can handle the higher feed rate per revolution. The head is being used to drill 2 holes at 0.326" diameter and one hole at 0.218" diameter. The material is stainless steel and their machine makes a lot of thrust. They can not reduce the thrust or increase the RPM unless they buy a new drill press and of course, they are resisting that idea because the drill press they would need to buy (probably a used Bridgeport actually) costs much more than the head I sold them. The bearings inside the head do not last very long because they are being pushed way past their thrust ratings. Because of the close C-C spacing, there are no larger bearings or "stacked" bearing options available to me at this time without actually building them a brand new drilling head. They are open to this as the fault here is clear - they need the proper machine to drive the head... But... Before we go down either the new and more robust head route or new machine to drive the head route... I'm wondering if there are any bearing experts out here who can tell me whether there are any specialty bearings that take higher thrust numbers or even vibration better than a typical ABEC 1 bearing. I was thinking ceramic, but I don't think they would take vibration very well... We were thinking of going to higher ABEC numbers on the bearings but I'm not sure that will help either s it shows higher RPM ratings, but not much difference in thrust ratings. Before anyone asks, we can't change the input/output RPM of the head to compensate either. If I could simply have the inpututput at 1:2, that would solve it, but there is no room for the gearing inside their footprint to do that... Random thoughts from the wild welcomed! We have two solutions as noted above, but the customer would like to avoid both if possible... Regards, Joe Agro, Jr. (800) 871-5022 01.908.542.0244 Automatic / Pneumatic Drills: http://www.AutoDrill.com Multiple Spindle Drills: http://www.Multi-Drill.com Flagship Site: http://www.Drill-N-Tap.com V8013-R |
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