Est. 1998 — 27 years of woodworking knowledge
PM 3520
ben d.
Just passing along with my stumbles in replacing a belt on my 3520 lathe.
The only problem was that I did not know on the driven sheave there is one set screw on the key way and a set screw that goes into the shaft. Actually there is 2 one stacked on the other and the outer one has to be removed to see and loosen the second screw.
Probably everyone knows that but me but passing along.
ben d.
Re: PM 3520
John lucas
Didn't know that but I have run into it on other machines. Thanks for telling us.
Re: PM 3520
Bob Moffett
I didn't know that either. Thanks for telling us. How involved is it to change the belt?
Re: PM 3520
ben d.
It is not that difficult if I had known about the set screw.
Take the wheel off the left end, unlock the lock ring for the nut on the shaft remove the nut, loosen the set screws on the driven sheave and remove the set screw that goes through to the shaft and loosen the inner set screw, remove the locking mechanism that locks the spindle and you can get to the set screw that locks the locking ring in place then just tap the shaft through it is a precision fit but is not tight, tight. You can check conditions of bearings then and just reverse procedure. Be sure to align the pulleys. The locking nut on the left end of the shaft is tightened up just enough that there is no end play in the shaft when finished, so tighten and bump the shaft to see everything is seated and back the nut off so there is no end play.
If ever I have to change another one probably an hour to hour and half. I am a bit slow anyway.
Just for information I purchased the belt from Polybelt.com Clifton NJ to my door for $14 and some cents.
ben d.