|Forum topic by LeChuck||posted 10-21-2012 07:27 PM||1488 views||0 times favorited||3 replies|
10-21-2012 07:27 PM
I have a Porter Cable 15” DP, the PCB660DP. On paper, it’s a great bargain for its capacity and price.
I’ve been troubleshooting it because it’s had a good amount of rattle and vibration from the start.
I’ve been checking runout, and I’m wondering how much runout is too much in theory.
I’ve removed the belts and checked the spindle pulley. With my finger on it while it’s running at good speed, I can’t really detect runout on that one.
But I checked runout with a dial indicator on the quill, the harbor, and the chuck. At the bottom of the chuck, on the outer sleeve, the runout is about .008, 8 thousands. But if that part is not machined exactly round, well, it’s not the outside of it that matters most.
I also checked runout on the quill, the 1/2” part that is visible, and runout is about .002, maybe a tiny bit under that. It is also the same on the harbor (the taper part) right below that. I then did the same check on a 1/2” forstner bit inserted into the chuck and runout on that was .006. That was checked closer to the chuck and also towards the bottom, closer to the cutting head. Of course, this is the outer area of the bit. All this checked while turning the spindle by hand and with the belts off.
Are those results too much (especially where it matters, on the bit) or within acceptable variations for machining? As a digital photographer, I’m all too familiar with the pixel peeping syndrome and I do not want to make too much out of this. It’s really the rattling that got me to start checking. I did clean the harbor and quill and reinserted the chuck. I have no idea how to separated the chuck from the harbor though. The holes that it makes seem to be alright although I haven’t checked them with precision. Going to the store to have the chuck replaced runs the risk of getting one that is worse.
As for the rattle and vibration at the top (I am not talking about the rattle of the metal cover), I’m not sure. I can’t detect enough of a wobble in the motor or spindle pulleys, and nut and screw are tight on those. Running the motor with nothing else attached doesn’t make too much noise, only the top cover is a problem.
However, the idler pulley in the middle has a definite wobble to it, visible when spinning it by hand, and can be felt easily when the drill is running, contrary to the other 2 pulleys. I am not sure though if that is a real issue. Any opinion? The pulley can be pulled right out but I am not seeing how to disassemble it so I can try to reseat it, if possible. It is not loose at all, but seems to be mounted a bit tilted on its axis.
Thanks for any advice!
-- David - Tucson, AZ