Originally Posted by Frogblender  Do you have a tachometer to verify your actual spindle speed? Tachs are nearly free on ebay. I bought a model "DT-2234C+" (search "New Digital Laser Photo Tachometer Non Contact RPM Tach" on ebay); I tried various pulley configurations on my drill press, and the tach readings almost perfectly match the RPMs on the little pulley drawings tattooed to the drillpress cover. So I'd say the tach "works good".
However, my NM135 spindle seems to top out around 3500rpm  But I think this may be due to a spindle problem (high runout, very noisy, gets hot (the spindle, not the motor)), which the good folks at Novakon are taking care of. |
runout sounds bad. hopefully they get that fixed up quick. are you sure its spindle runout and not tool holder? i had terrible runout til i realized it was the collet. its still not spectacular, but its under .001" and thats acceptable to me. my spindle also get very warm after running for an hour. i assume thats normal to some degree. its not so hot i cant touch it.
as for rpm. if you have the latest model, should be 6k. old one was 3500. i wonder if they just used the wrong motor. you could try to look for the label on the motor, but its tucked inside the head so might not be able to see it without removing it.