This precision grinder was used in the composites business when I worked with Roush Composites not only did it do its job but also sanded roof wings 10-12 hours a day 6 days a week straight. , fun carbon fiber bodies, Nascar Kevlar bumpers, Viper splitters and Nascar air filters. the new one was because we had a big fire and it was destroyed) but up to this point it was running at 3/4 power and never had such a breakdown during my work (except for having to replace the sanding pad) That's it .