The term "heavy duty" sewing machine is thrown about loosely lately. There are new machines (including Pfaff, Singer, etc) for sale advertised as "heavy duty," but I would be hesitant to stitch denim jean hems on them. The Pfaff 807, which appears to be an older mechanical, is probably more "heavy duty" than some newer machines on the market. However, "heavy duty" does not mean that you can sew big canvas sailcloth or heavy upholstery projects. A domestic machine (which the Pfaff 807 is) is really meant for general domestic sewing. If you want to sew "heavy duty" fabric, then look to an industrial machine. Remember that frequent sewing of heavy fabric takes a toll on a domestic machine, ie the motor, needlebar, other working parts, thus hastening the demise of your machine and the more frequent need for service & repair.
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