Powerkraft 10'' spindle issue

guess I should have got the .0001 indicator.... this thing is touchy as hell to set on zero! yes the bore is bad... what angle would I go in at... angle of 3mt shank.... would a boring bar get it close to tolerance or still need the mt3 reamer?

outside of spindle is .00007 which im thinking is bad enough? But usable?
 
I better preface this by saying that I have never bored a spindle and am by no means an expert. And probably the best way would be to remove the spindle and take it to a machine shop that could regrind it. Hopefully some other folks will chime in now that the forum seems to be fully functional again. But if I was going to do it myself, here's how I would go about it.

Yes you need to reproduce the angle of the #3 morse taper. To do this, chuck up a piece of steel and turn a 60 degree taper on it. Without unchucking your new center, place a 3MT drill chuck arbor between centers (dead center in tailstock). Set your compound (or taper attachment, if you have one) to the proper angle by indicating on the arbor. Then setup your boring bar and bore the spindle taper just enough to clean it up. Then ream with a 3MT reamer to correct any slight error in the taper angle and give a better surface finish.

As far as the runout on the outside of the spindle goes, I think 0.0007 is acceptable.
 
The only measurement that you showed that has any real value is the run out of the spindle register. Since the MT of the spindle is so buggered up, nothing held in it will be accurately held enough to rely on. Typically, you would stick the tip of your DTI inside the spindle and run it on the spindle taper but you cannot do that because it is all chewed up.

Replace the spindle if you can. Optionally, you can ream it or have a shop ream it but the accuracy of that will depend on how good a job is done on it. If Logan Actuator has a spindle, I suggest you just buy it.
 
The only measurement that you showed that has any real value is the run out of the spindle register. Since the MT of the spindle is so buggered up, nothing held in it will be accurately held enough to rely on. Typically, you would stick the tip of your DTI inside the spindle and run it on the spindle taper but you cannot do that because it is all chewed up.

Replace the spindle if you can. Optionally, you can ream it or have a shop ream it but the accuracy of that will depend on how good a job is done on it. If Logan Actuator has a spindle, I suggest you just buy it.
I did take a measurement on the inside of the spindle just didn't get a pic of it.. it measured .0023 im wondering how much it would cost to take the whole spindle to a machine shop and have it done.... by someone who knows what there doing!
 
Back
Top