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- Feb 1, 2018
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Did you align you machine bed with a level first? The machine is not new, so you can't expect perfect. Oh buy yourself a .0005" indicator. Take off the chuck and back plate and run the spindle at high speed for about 30 min. shut it off and lay your hand on the spindle housing and see if it is almost to hot to touch 140 F to 150F. Then mount the mag base on the spindle headstock and put the indicator on the top of spindle and slide a 2 x 4 or 2 x 6 under the spindle and slightly pry up on the spindle say put 20 pounds pressure up. the indicator should not have any movement or less then a tenth (.0001") Then put the mag base on the face of the spindle and check lateral movement. Again you should not have more then a tenth. Look on page 75 - 77 and see what I mean. https://cdn0.grizzly.com/manuals/g4003g_m.pdf. If that checks bad then tighten up the spindle spanner nut a 1/16" or 1/8 turn.
I know the manual is not your machine, but they have good manuals and a lathe is a lathe.
Like the others said remove the face plate and check for burrs. stone any with med grit Indian lapping stone wipe everything off with your hand and screw it back together. If you were a bit more experienced i would say to blue up threads and taper. check the outside face of the and if it's with in .001" put your chuck back on and snug up the bolts but not super tight. Then check the OD of the chuck and tap it with a dead blow hammer and get it spinning on the spindle axis like you do with a 4 jaw chuck. Get that less then .001". Have to be a detective and test and retest before taking something apart. SKF bearing company says that many times one makes things worse then leaving the bearings alone.
If you do remove the spindle we can talk about how and what to do later. Rich
I know the manual is not your machine, but they have good manuals and a lathe is a lathe.
Like the others said remove the face plate and check for burrs. stone any with med grit Indian lapping stone wipe everything off with your hand and screw it back together. If you were a bit more experienced i would say to blue up threads and taper. check the outside face of the and if it's with in .001" put your chuck back on and snug up the bolts but not super tight. Then check the OD of the chuck and tap it with a dead blow hammer and get it spinning on the spindle axis like you do with a 4 jaw chuck. Get that less then .001". Have to be a detective and test and retest before taking something apart. SKF bearing company says that many times one makes things worse then leaving the bearings alone.
If you do remove the spindle we can talk about how and what to do later. Rich