VPI uni-pivit arm is Croocked

VPI uni-pivit arm is Croocked

Postby Almandog » Thu Sep 05, 2019 12:16 am

Hello:

I have owned a few VPI TT with the uni-pivit arm. My current TT is the VPI classic 3 signature. The uni-pivit arm is wearing me out. The arm is always tilted to one side no matter how I adjust it. I also notice that the sharp point in the arm housing has rounded quite a bit. I remember some time ago when I touched it I would get a sharp prick like a pin sticking me. Now i can run my finger across it without worrying. Is this normal?
Has anyone else notice the tilted arm? Mine is tilted to the left and sometimes the ears (the part that sticks out from the arm housing) touches the base of the housing.

But with all this discomfort, the TT still sounds awesome. But I hate those things about the TT that I pointed out. I owned the vpi classic, scout, and scout 2, and they all have those faults I mentioned that bothers me.

What's your experience with the uni-pivit arms?
And do I need the arm repaired?

Mando.
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Re: VPI uni-pivit arm is Croocked

Postby Orchids1 » Thu Sep 05, 2019 9:24 am

The arm should not tilt if the bell housing is seated on an undamaged spike, unless the azimuth is way out of wack.If the tip of the spike has become deformed, I suppose it could move around inside the housing and the arm could tilt one way or another. I doubt the spike can be sharpened (perhaps someone else here knows for sure) and probably needs to be replaced. Check with a dealer or VPI. Rich
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Re: VPI uni-pivit arm is Croocked

Postby Mr_Putty » Thu Sep 05, 2019 9:41 am

Posting some photos would greatly help others give you their opinion. As a minimum, I suggest photo of the arm on a record from the front, one showing the arm side weights and one of the spike. My only complaint about the unipivot is that it’s hard to get on the spike correctly. The newer designs may be easier. I try to mark the position of the arm at the pivot before removal to aid in its placement.
JA
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Re: VPI uni-pivit arm is Croocked

Postby Almandog » Thu Sep 05, 2019 11:00 am

The spike is rounded and I can run my finger over without being pricked by the spike. When the TT was new I could not do that.
I sent an email to vip but no word yet.
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Re: VPI uni-pivit arm is Croocked

Postby Brf » Thu Sep 05, 2019 2:58 pm

Take note of the following....

Basics
Table is level
The tonearm spike is properly seated on the bearing cup
The lemo wire is relaxed and not putting a stress on the tonearm
The azimuth weights are both screwed in all the way
The tear drop counter weight is perpendicular to the plinth
Improperly installed dual pivot point (if you have one)

Moderately advanced
The gap between bottom of the azimuth weight ring and dog leg platform should be around 1/4"
The pivot spike and bearing cup's center of gravity is too high i.e. unstable ( the bearing cup should almost inline with the bottom of the bearing bell)
The pivot spike is bent or not perpendicular to the force of gravity (visually inspect)
The bearing cup has a score or defect that is not centered within the bearing cup (visually inspect with a flashlight)

If you post a picture of your arm, perhaps that will give us more information.
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Re: VPI uni-pivit arm is Croocked

Postby Almandog » Thu Sep 05, 2019 9:13 pm

Here are some pictures.
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Re: VPI uni-pivit arm is Croocked

Postby Brf » Fri Sep 06, 2019 7:06 am

Based on the first picture, it would appear that your counter weight is rotated a bit clockwise which would result in a left lean. Try rotating the counter weight counter clockwise to see it it will balance the arm.
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Re: VPI uni-pivit arm is Croocked

Postby Almandog » Fri Sep 06, 2019 11:01 am

Brf;

I did all that already. I tried everything to get it balanced and evened out but that's what I ended up with.
I might have to get a new arm. I will wait until I hear from VPI before I make any move. It's been several days now since I emailed them but no reply as yet.
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Re: VPI uni-pivit arm is Croocked

Postby Brf » Fri Sep 06, 2019 11:54 am

Almandog, remove the SoundSmith CI, rotate the counter weight counter clockwise until the thumb screw is just left of top center and post another picture of the arm. Also, I assume that the side azimuth weights are turned all the way in. I have another suggestion, but I want top exhaust this possibility first.

BTW, that's a great arm!
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Re: VPI uni-pivit arm is Croocked

Postby Almandog » Fri Sep 06, 2019 8:32 pm

I adjudged the ears so that it would not touch the base. But the arm is still wobbly.
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