What type of drive roll should I use for hard wire on the Multimatic 255?
V-Grooved rolls are recommended for hard wire on the Multimatic 255. Drive roll types may also be mixed to suit particular requirements, such as a V-Knurled roll in combination with a U-Grooved roll. Selecting the correct roll type helps ensure proper wire feeding performance. (Page 11)
From the official Miller Multimatic 255 Multi-Process Welder manual, page 11
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