I bought this LFA 0-0.25" range mini chuck a while back & finally got around to 'almost' using it. I put some accurate pins of various diameters & it measures consistently crappy runout. Like north of 0.004" so I am a bit bummed. The mechanism is smooth & jaws close nice. I have a larger LFA in my drill press & is pretty decent at least for that application like ~ 0.001" so I wasn't expecting it being this bad.
I put a DTI on the arbor collar, not that it means much, but its within 0.001" & the shank itself seems nicely ground & under 0.0005" right adjacent to collect lip. I'm holding in an accurate R8 collet for testing. This particular arbor threads into the chuck body as opposed to typical taper mount.
Since its rather useless for intended purpose of teeny drills & confined chuck space in certain applications, I'm wondering out loud about drastic measures. If I unscrewed it & turned down the threads a bit so it had just enough lateral play to compensate the 0.004" back out. Then coat the threads with retaining compound or filled epoxy, establish runout back to zero & let the adhesive set up. The gaps are so small I really don't think it will come apart. well.... ever
Viable plan or wishful thinking?
I put a DTI on the arbor collar, not that it means much, but its within 0.001" & the shank itself seems nicely ground & under 0.0005" right adjacent to collect lip. I'm holding in an accurate R8 collet for testing. This particular arbor threads into the chuck body as opposed to typical taper mount.
Since its rather useless for intended purpose of teeny drills & confined chuck space in certain applications, I'm wondering out loud about drastic measures. If I unscrewed it & turned down the threads a bit so it had just enough lateral play to compensate the 0.004" back out. Then coat the threads with retaining compound or filled epoxy, establish runout back to zero & let the adhesive set up. The gaps are so small I really don't think it will come apart. well.... ever
Viable plan or wishful thinking?