Review on Jonard GD 100 100 1000 Graduation Accuracy by Kevin Mariappan

Use this large, round-tipped force gauge from Jonard to fine-tune the upper and bobbin thread tension on your sewing machine. On my 1948 White Series 77 sewing machine, all of the tension settings were out of whack. And these "tension settings" are only adjustments that affect the sewing machine itself, and not independently verifiable tension settings. Sewing machine tension settings do not measure actual upper needle tension. Thread tension or bobbin tension. These settings only set the tension relative to the machine itself and these settings do not provide a measurement of actual top and bobbin thread tension in ounces. To properly adjust tension on a White Series 77 sewing machine, use the Jonard bullet point. Large Force Gauge and follow these steps.1. Auto refuel normally 2. Sew a loop at the end of each upper and lower thread as the thread comes out of the machine.,3. Slide one of the loops over the large tip of the tension gauge and use the gauge to pull on each thread. Set the top tension to 16 ounces using the tension adjuster on the front of the machine. If necessary, make physical/mechanical modifications to the machine to achieve these tension settings. I don't know why unequal voltage works so well. But these tension settings work great. The White Series 77 loves to sew smoothly with 2 ounces of bobbin thread pressure and 16 ounces of needle thread pressure. The White Owner's Manual does not provide actual "ounces" for top and bobbin thread tension. I've spent a year trying to figure all this out and I hope you will believe me when I tell you that you need to set the tension on a sewing machine with precision. You need a reference (like I give you with this note) and an independent voltage sensor.