This video shows the right technique for marking, cutting, and preparing cable trays used in electrical and mechanical installations. In the Oglaend System Cutting Guideline you can easily find out what the optimal cutting lengths/intervals are for all modular products. Oglaend System manufacture and deliver Multidiscipline modular bolted support systems, cable trays, cable ladders and accessories for complete installation and containment of Instrument, Electrical, Telecom, HVAC and Piping. Watch how a professional fabricator perfectly marks, measures, and cuts a cable tray using a hand grinder with complete accuracy. Watch how a professional fabricator. Internal grinding is an abrasive process that removes material on the inside diameter (ID) of tubes or the ID of part features such as bores or holes. Not all cable trays are equivalent.