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Posted: Wed Mar 07, 2012 2:48 pm
by dusty
keakap wrote:If I remember correctly the newer tubes are "more eccentric". I'm not with them at the moment and can't see 'em, but aren't the originals "one piece"? The newer ones are two cylinders mounted together with a plate and screws, reminiscent of the Lift Assist biness. The plate, with the enormous mechanical advantage of the heavy Bandsaw working on it, becomes quite flexible. So there's flex there in addition to any found in the mount or the BS frame itself.
Note: there is flex in the mount!
Yes, the old eccentrics are one piece but they do not offset the bandsaw far enough to lift the headstock into drill press mode with the bandsaw mounted. It is close but here close does not count.
Posted: Wed Mar 07, 2012 3:15 pm
by keakap
keakap wrote:...
However...
and however, and on the other hand:
2 things: 1) "damage" done to spindle (or not)]]
Jim McCann has been generous enough to provide an excellent illuminating explanation of spindle/setscrew interaction in a case like mine, and has graciously permitted me to copy you all:
"As far as the damage to the spindle goes... There should not be any. I say that because the quill spindle is much harder than the setscrew. At the most, the setscrew leaves a "rub or a smear" of it's tip when this happens. Sometimes this metal residue can be picked off with a sharp pointed object like a pick or an awl. Otherwise it takes a light touch with a fine file. I would run the file over the circumference, perpendicular to the center of the spindle, pushing the file and rolling over the surface at the same time. The metal smear from the setscrew should be easily removed. Since the spindle is the same hardness or slightly harder than the file, the file will not remove any metal from the spindle to change the spindle diameter or fit between the arbors and the spindle.
Also, because of the damage to the setscrew, its point is no longer correct. The setscrew hole in this arbor (as well as all other Shopsmith arbors) is drilled and tapped at an angle to be perfectly perpendicular to the tapered flat on the spindle. That is why all these arbor setscrews have either a flat point or a cup point. These two types of points on the arbor setscrew will seat flat against the flat on the spindle, locking whichever arbor is attached, securely to it. When part of this flat point or cup point is wiped off, the tip of the setscrew is no longer correct and will not lock properly against the flat of the spindle. "
2) With nothing else new to present, this is resolved: Wes took me thru the short procedure to readjust various settings in the PP operational properties, and the "growling"(whatever) problem is gone.
I believe every other aspect of this situation has been covered.
To be sure, I am more than satisfied that SS, top to bottom, is extremely concerned with these situations and their proper and timely resolution.
*** And that I am hugely pleased with the Support and happy to have this Sweet machine back running right!
If I've left anything out...
Posted: Wed Jul 25, 2012 4:09 pm
by camero68
Thank you for this reminder! Consider it well-noted. You are blessed to have been spared from an unfortunate mishap.
SPT hubs loosening
Posted: Sat Jul 06, 2013 10:31 pm
by qzztv3
wa2crk wrote:I have had my PP jheadstock since 10/22/10 and recently I noticed that it seemed to be making more noise (rattling) than before. The noise seemed to be coming from low in the headstock so I suspected something near the motor.
I did have some rattling noises when I first got the PP and those were traced to the set screws on the SPT hubs coming loose.
I suspected then and (still do) that the loosening of those screws was caused by the pulsing of the PP motor and the power supply.
The DVR motor as I understand them runs by the power controller pulsing the stator coils which causes the rotor to move. This pulsing and the speed control aspects can cause a vibration under various speed and load conditions.
When I loaded the system with the sanding disc the flywheel effect and the load quieted the noise considerably. I ran the disc up to the 3450 RPM speed.
I know that that is too fast for the sanding disc but it was just a test. The rattle was very loud at the higher RPM with no load and almost gone with a load on the spindle.
This time the rattle was traced to a loose set screw on the motor pully. It was loose by almost one full turn. After the screw was tightened the noise was gone and the headstock sounded like it did when it was new.
I am going to contact CS tomorrow and ask if it is OK to put a drop of blue loctite on that screw.
I will let the group know what they say.
I bought my headstock factory assembled so I don't have the full information that is provided with the DIY conversions. The book with that comes with the assembled headstock is very limited in providing detailed mechanical info.
Bill V
I just upgraded to a PP (tried a DIY but ended up having SS do it). I have done some testing - bandsaw, jointer and saw - and put it away. I read about the planner reversing issue so was playing with different speeds but nothing attached. Then I got a 'rattling' sound. I wondered if the eccentric was off but after everything stopped rotating, I noticed the lower hub was loose. I thought SS might not have tightened it but from what you are saying, this might be something to check quite frequently. I guess this is one of the growing pains for the PP.
SPT hub issue
Posted: Sat Jul 06, 2013 10:53 pm
by qzztv3
Error - double post
Posted: Sun Jul 07, 2013 10:01 am
by wa2crk
QZZTV
I did put a small amount of blue Loctite on the auxiliary spindle hubs cause you don't remove them very often. On the hubs that go on the spindle I have not used the Loctite for the opposite reason. I must be a really strange guy because I have never had a spindle arbor or lathe center etc. come loose on the spindle even with the PP.
I did put some Loctite on the motor pulley set screw a while back and this seems to have cured that problem for the moment.
Now here is where I start speculating. If the band saw is used when the saw blade is still attached to the spindle will this operation take the PP out of it's normal operating program? (unusual load) This MAY BE something that was not accounted for in the original programming. However running the jointer with a saw blade attached MAY HAVE been accounted for in the original programming because that is a combination that SS has allowed in the past, I believe in PTWFE.
In the long run I am very happy with my PP ( I bought a factory assembled unit ). There were some growing pains for sure as well as some operator re-education that needed to be achieved as well.
Bill V
Thanks
Posted: Sun Jul 07, 2013 5:03 pm
by qzztv3
I am still new at this so don't do things like running the BS with a saw blade attached. Guess I am retired so not in that much of a hurry. Anyway, it is just prudent to check things closely, and I agree some Locktite on the hub setscrews- not the arbor setscrews - would help.
Thanks
Posted: Sun Jul 07, 2013 5:03 pm
by qzztv3
Excellent thread with 87 comments!