You may believe that machining rotors is unprofitable when compared to installing new rotors, but the opposite is dependable. tug in a patronize does not take up armory and does not have to be delivered by a parts store. You precisely have to make machining a line item on the compensate order, rather of giving it away with every brake job .
You may besides think that installing new rotors eliminates the possibility of a rejoinder. however, this myth creates more comebacks than it prevents. These comebacks frequently start with blaming the new pads and end with the customer having to return a second base or third meter until person pulls out a dial indicator and micron. ad therefore, installing new rotors is not a way to avoid having to use a micrometer or dial indicator. For every brake job, you should always measure for runout ( on the rotor and flange ) and the dimensions of the rotor before brake serve is performed .
After the rotor is resurfaced or a newfangled rotor is installed, it should be measured for runout when it ’ s installed on the vehicle as a quality-control method acting. A modern rotor could have excessive runout when it is installed on the vehicle due to a stack of tolerances .
It has often been said that you should never machine new rotors. But, what if the runout exceeds the manufacturer ’ sulfur specifications when the new rotor is installed on the vehicle ? This is when it ’ s permissible to machine a newfangled rotor with an on-the-car brake lathe. This helps to match the rotors to the hub flange. ad
EQUIPMENT PLACEMENT
For far besides long, brake lathes ( both terrace and on-the-car ) were pushed to the back of the workshop .
This can kill productivity. Granted, a bracken lathe can be a noisy and dirty piece of equipment if it ’ s not operated properly. But, when the technical school has to walk halfway across the workshop a few times, it becomes a productiveness cause of death. so, position your brake lathe where you perform the most brake work .
ADAPTERS AND ACCESSORIES
not having the right adapters and accessories can besides be a productiveness killer whale. Having to set up a lathe multiple times for the same rotor, or cutting runout into a rotor due to a mounting mistake can be very frustrating. Having the correct adapters and accessories can speed frame-up and prevent mistakes. besides, the rotor should be removed to measure runout in the wheel ’ s flange.
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ad even if you are using an on-the-car bracken lathe, you should constantly remove the rotor before turning it. Removing the rotor may seem like you are offsetting the time-savings advantage of an on-the-car lathe, but it is a critical footstep that can help accentuate this type of lathe ’ second main advantage – reducing runout and thickness magnetic declination .
ALWAYS MEASURE
You may think that you are not paid to measure thickness and runout, but are you paid for a comeback ? As mentioned earlier, even if you install a new rotor, you are setting yourself up for a rejoinder if you do not measure using a micrometer or dial indicator. even a “ perfect ” rotor will have runout if it is put on a flange that has runout or corrosion. ad
CUT IN ONE PASS
Cutting a rotor in one pass is essential for productiveness. For noncomposite rotors, it ’ s potential to take a a lot as 0.020 ” per side while however having an acceptable finish. however, with a composite rotor or one with hard spots, the depth should be reduced, likely below 0.010 ” per side, for a quality polish. In arrange to remove this much material, it is essential to have sharp bits .
In order to cut a rotor fast, you must go slowly with the crossfeed .
however, cutting besides fast will reduce the cut quality and possibly create chatter. A larger diameter rotor will need to turn slower than a small-diameter one. Single-speed lathes are set at the slower speed of the largest application they are designed to cut. This is normally around 0.002 ” per revolution. ad Regarding the focal ratio of the arbor, rules are the lapp as the crossfeed – the bigger the part, the slower the tip. Again, single-pass lathes are set to the slowest accelerate, typically around 100 revolutions per minute.
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Being able to measure and machine rotors efficiently is critical for any shop performing brake service. If you don ’ metric ton think you can do it the mighty way, it ’ south meter to invest in equipment and train, or get out of the brake business .