Singer can tell you that it's quite a chore to build features into a machine like this ... And they're frank to give Doehler-Jarvis major credit for making their job easier with a new method for designing and producing precision parts. That means 99% of all the NA serial numbered sewing machines were not made in 1951.
We call this precise new way of making things, "Tripod-Control Dimensioning". With it they could control precision of and between two (or more) die castings of an assembly. 1952-1957 The majority of Singer 301/301A sewing machines where made between 1952-1957.
It all started back in 1935 when Singer Manufacturing Company ask Doehler-Jarvis to help pioneer the first die cast aluminum sewing machine components. They selected a point of vantage common to the parts. In 1952 production started on the Model 301 at the Anderson plant in South Carolina and were shipped to Singer stores prior to the Grand Introduction of the Singer Model 301 in October 1952.
To meet the rigid precision requirements, Doehler-Jarvis engineers devised what may have been the first ground and hardened toolsteel casting die ever used. Through the point was established a "tripod" of reference from which all critical angles and dimensions could be controlled. In 1953 the suffix "A" was added to the model number, 301A, to signify it was made in Anderson, South Carolina.
This new slant-needle sewing machine would become the Singer Model 301. By the time the "Slant Needle" model came along, "Tripod-Control Dimensioning" had grown to a full-fledged design and production technique . Singer's new 160th Limited Edition is Inspired by Classic design, modern features and traditional touches.
Ironically, it has the same number as the stitch type it sews - Stitch Type 301 - Lockstitch. The Singer 160 is made of plastic and weighs 18.6 lbs.
It has been found that if the parts are inclined less; than about eight degrees from vertical, a clear stitching point is not obtained.
It was patented to Singer Manufacturing Company on 5 February 1946. you never saw production flow more smoothly when complex precision parts are made by one company, finished and assembled by another. (Made of die-cast aluminum for light weight and sturdiness) In the photo above the two major Doehler-Jarvis die castings that frame "Singer's new Model 301" have been assembled, then sliced down the middle to show the (Tripod-Control) method.The Slant-Needle was a dramatic departure from previous Sewing Machine Designs! It has an internal 103 teeth motor belt with a maximum of 750 stitches per minute, portable with a carrying handle but does not fit in a cabinet, and a 5 year warranty on electronics.Doehler-Jarvis and Singer Manufacturing Company How Doehler-Jarvis Helped Singer Develop ... The Singer 301 is made of die-cast aluminum and weighs 16 lbs.a new way to build precision into parts and make a fine product finer than ever. It is metal gear driven, no belt that can slip, with 1500 stitches per minute, portable and full size with a carrying handle and it fits in a cabinet.1954 Magazine Article Have you seen Singer's new "Slant Needle" model ... It has no warranty because it was made to last a lifetime.What had been discovered was the way to extend a familiar two-dimensional control . The Singer 301 was the first model to be manufactured and the Model Number Tag was simply 301.