Singer CLASS 99 To Adjust the Needle Thread Tension, To Adjust the Bobbin Thread Tension

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Class 99 & 99K

To Adjust the Needle Thread Tension

Lower the presser bar and turn the numbered dial X to bring the numeral "1" opposite the center line Y, Fig. 29 between the plus and minus signs on the tension indicator. Press the numbered dial inward as far as it will go, and turn the thumb nut Z until the pin engages one of the holes in the numbered dial. Turn the thumb nut, together with the numbered dial, to the left. This should cause "0" to stop opposite the center line if the tension is properly assembled. Now insert the pin of the thumb nut Z in different holes of the numbered dial until one is found which gives a slight perceptible tension on No. 50 mercerised thread when the thumb nut is turned to the extreme left and the numeral "0" is opposite the center line. This tension gradually increases with the turn of the thumb nut to the right, providing a full range of tensions from light to heavy with one revolution of the thumb nut.

Fig. 29 To Regulate Needle Thread Tension

To Adjust the Tension on the Thread Take-up Spring

The tension on the thread take-up spring should be just sufficient to take up the slack of the needle thread until the eye of the needle in its descent reaches the material.

To Adjust the Bobbin Thread Tension

First adjust the needle thread tension, as instructed above. Then, using No. 50 mercerised thread in both the needle and the bobbin, and using two thicknesses of thin material under the presser foot, turn the numbered dial by means of the thumb nut, to bring the numeral "4" opposite the center

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Contents Class 99 & 99K Sewing Machines Sewing Suggestions Table of Contents Instructions for Operating the MachineLight Electrical InformationTo Insert New Bulb To Remove BulbIf the Machine is Electrically Operated To Operate the Hand Machine If the Machine is Hand OperatedBelt Shifter If the Machine is Treadle OperatedProtection Against Rust Damage To Oil the Machine and Stand Class 99 & 99K Needles and Thread To Set the Needle Upper Threading To Remove the Bobbin To Wind the Bobbin Class 99 & 99K To Replace the Bobbin Class 99 & 99KTo Prepare for Sewing To Start Sewing To Start SewingBasting To Turn a CornerTo Sew Bias Seams To Remove the WorkTo Reverse the Direction of Feed To Regulate Length of StitchThread Tension To Regulate Pressure on Presser FootTo Regulate Needle Thread Tension To Regulate Needle Thread TensionTo Regulate Bobbin Thread Tension Bobbin Thread Tension Table of Contents Previous Page NextTo Adjust the Tension on the Thread Take-up Spring To Adjust the Needle Thread TensionTo Adjust the Bobbin Thread Tension To Remove the Bobbin Case To Clean the Stitch Forming MechanismRaising the Bobbin Case Latch Removing the Bobbin Case To Replace Bobbin CaseSewing Suggestions To Replace Slide PlateBreaking of Needles Might be Caused by Breaking of Bobbin Thread Might be Caused by Breaking of Needle Thread Might be Caused bySkipping of Stitches Might be Caused by Class 99 & 99K Applications Foot HemmerHemming Hemmed Seams Lace Applied over Hem Hemming with LaceInserting the Binding BinderAdjustment and Operation Binder Inside Curves Binding Curved EdgesOutside Curves Shirring Gathering FootRuffler Adjusting PointsGathering Forming and Attaching a Ruffle in One Operation Group Pleating PleatingSeam Guide Zipper Foot Skirt Zipper Corded Welting Corded Seams Buttonholer Fashion AidsBlind Stitcher Bias Gauge Joining Lace and Insertion EDGE-STITCHERTucking French SeamsQuilter To make hems from 3/16 to 15/16 inch wide Adjustable HemmerWide Hemming Tucker Darning or Embroidering Needles Darning or Embroidering