Are you tightning the screw by hand, maybe a tool is needed for proper tightness? I think you will get a better answer from VPI let us know.
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Medium strength Loctite available at Home Depot.Take the screws out completely and brush the threads clean with alcohol using an old toothbrush.Then place a drop of Loctite on them and torque them back in.Done for good.Loctite is not good for plastic parts though.Note that the medium strength Loctite is removable with excessive force .There is also a permanent Loctite but I wouldn't recommend it.That's what we use at work to install bolts.
Best of luck
Just to make a few thing clear here folks, The screw is not getitng loose that much. The Platter sits on a shaft that is rotated by the motor inside the VPI 17F, there are three screws that fix the platter onto the shaff, these 3 screws are on the top of the patter they just hold the platter.
Now the screws I am talking about are below this metal disk that holds the platter. The Disk has two screws and they are slipping.
I guess the information that I put upfront was not complete.
I had a similar problem with my 16.5 after only a few hours of use. I thought the gears in the motor were stripped, they're only plastic. While the machine was under warranty, it was too much trouble to return it.
After opening the machine up, I noticed the motor was a Dayton as supplied by WW Grainger. No model # was visable. I called VPI and spoke to harry's wife who gave the motor #. I ordered it from Grainger only to find that it was the wrong motor. It was the one used in the Typhoon. I decided to remove the motor and mounting plate from the 16.5. After doing so, I found the problem.
There are 2 set screws locking the table plate to the motor shaft. There is a flat ground on the motor shaft onto which one set screw must be tightened. The 2nd screw locks down on the round. Whoever fastened down both screws didn't make sure ONE was on the flat of the shaft. So much for the American manufacturing prosesses.
My machine now has plenty of table power and I have two spare VPI motors; anybody need one?
I have one for each. The first Grainger part number was for the Typhoon. It ran $63. and as soon as I compared it to the one in the 16.5, I knew she gave me the wrong motor number. After getting the correct number I reordered from Grainger. While I was removing the motor I noticed the score marks on the motor shaft. Checking out both set screws I noticed they were both screwed in at the same dimension. Furthermore, there was no mark on the flat of the motor , telling me that both screws were locked down on the round. I affixed the platter bearing properly, remounted the original motor and everything was fine. I now have 2 new VPI motors that I'm too lazy to return to Grainger. The 16.5 motor ran $44.
Since I pre wash on the machine using more pressure than I should, I figure it's only a matter of time before I'll need a motor replacement.
Hi Ken Thanks for the Info,
I checked at WW Grainger, have looked at both Motors, and it appears the Dayton Typhoon Platter Motor requires a Run Capacitor also (not much, just $5), and also mentions it has the capability to also reverse rotation. Cool.
Now, I wonder who makes the Vacuum Motor! lol
It appears buying direct is a bit cheaper than from VPI, right? Mark