tone arm drifts towards the outside when lowering

Assuming a tonearm is unconstrained in the lateral plain during cueing (everything level, dust- and dirt-free, low friction bearings in good shape and properly adjusted, tonearm wire twist and other lateral forces eliminated, little friction between armtube and cueing support), then any amount of anti-skating applied during cueing will move the arm outward. That's what anti-skating devices do, push or pull the arm outward.

Actual behavior varies from one arm design to another. For example, outward cueing drift is typical with Rega arms and their clones, because (1) the anti-skate device applies some force even if set to "zero" and (2) that force is always on. OTOH, cueing drift on a TriPlanar is avoidable. Aside from the option of making anti-skate truly "zero", the anti-skate device is readily adjusted so that outward force is not applied until the stylus touches down.

Other designs may vary in other ways. Check all the factors posted above. If all seems okay then investigate the anti-skating functioning of your arm. Its design may or may not allow you to mitigate outward cueing drift.

thanks everyone.

I removed the anti skate and the problem went away. not sure if I can hear a difference or any issues with tracking.

table is level and I triple checked the VTF -- all good.

will try cleaning the lift

the table is the pro-ject RM 10 with a shelter 901 cart.

Interesting that I have just, in the last month, begun to notice this behavior in my arm: an RB700 mounted on a Basis 2200 Sig. Both arrived new in May of this year and as I say, the drift is a recent development. It was set up for me by my local tech (who I trust implicitly, he's not new to this). I will check my table for level asap.

As dougdeacon points out perhaps this is just a feature of the Rega arm. But if that's the case, would it not have been that way from the outset?

FWIW, cart is a Dyna XV-1s.

On second thought, maybe not. I do *use* the arm :-)

But if there are any other thoughts/opinions, fire away!

Problem resolved --

I cleaned the lift -- it was dusty/dirty.

My mistake on the set up -- I had the anti skate set up prior to adjusting the VTF.

Those two simple changes did the trick.

Thanks again everyone.