Pro-Cut PFM 9 OTV brake lathe. Resurfacing Toyota Land Cruiser LX470 brake rotor disk.

Listed for sale in CL: hhttps://denver.craigslist.org/tls/d/l...
OTV Lathe, machine resurface (turn) brake rotor disks, on the vehicle. Correcting run-out and parallelism of brake rotor disk surface. It, not only trues the rotor disk surfaces. It trues them to the vehicle, compensating for wheel hub run-out. End results is smoothest braking possible. OTVs, are especial useful, when dealing with wheel hub assemblies. That otherwise would require disassembly of wheel hub/bearing to remove rotor. Learning curve is short with a Procut OTV brake lathe, as run-out is automatically set with push of a button. Once auto run-out set, scratch cut is next procedure. Scratch cut finds contact point of cutting tips on rotor's disk surface. I'm just showing my final cut, which typically only one passes is needed. I managed to mess-up the scratch cut, going to deep. I corrected, by making another pass. Which gave me a nice clean surface on each side of rotor disks. Finial run-out was measure at less than .0005", hardly measurable. Doesn't get better or easier than this. Local Procut rep, said this model Pro-cut model PFM 9. Is the favorite of local Toyota Dealership shop, which has many different models of Procut OTV.

Parallelism:
Thickness Variation (Lack of Parallelism) between outer and inner disk of brake rotor. Measure at 8 equidistant places around diameter. Difference between smallest and largest measurement is thickness variation. Variation greater than 0.0008" (0.02mm) need correcting, according to Toyota Factory spec.

I have found more than once, run-out within spec. When measure with dial gauge on outer rotor disk. Which is about anyone measure (outer surface). Yet vehicle bucked, steering wheel vibrated and brake pedal pulsed while braking. Once Parallelism corrected with an OTV lathe. Braking became smooth as silk. So I've learned it's not enough to just measure outer run-out. We must also measure thickness variation.

When wheel hub run-out greater than zero, say .002". As we move further out from center on rotor, to measurement run-out at 10mm from outer edge. The .002" at wheel hub, will be .006" +- 0.001", depending on how far from center we move outer ward on the disk. The rear wheel hub run-out spec on 100 series, is .002" max. Even if rotor itself perfect (zero run out measured off the vehicle), by machining on bench lathe (off the vehicle lathe). Only two ways to correct this. Either replace the rear wheel hub (axle) OR use the OTV brake lathe. Using the OTV lathe, is obviously faster and very cost effective.