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pulley that fits the shaft on your motor. You do have to know the make and model of the machine. 

Another way to slow a machine is to replace the clutch motor with a rheostat motor. They operate the same way as a dimmer switch for a lamp. The operator sets the speed of the motor, and it does not run faster than what it is set at. When finished sewing, always place a piece of fabric under the presser foot in order to keep the feed dogs from causing damage to the presser foot. 

If the machine does not sew correctly, consult the troubleshooting guide to determine what the problem is and how to remedy it. [Figure 6-81] If the machine jams, it is very important to not force it, as you can cause damage to the machine. 

## Machine Maintenance 

The most important part of maintaining your sewing machines is to keep them clean and lubricated. Each machine should be wiped down daily with a clean rag to remove oil and dirt. The amount of use each machine gets dictates the cleaning required. However, on at least a weekly schedule, the moving parts should be cleaned with a small brush to remove dust, lint, dirt, and threads. An air hose or bottle is useful in blowing dirt out of places the brush cannot reach. Be careful 

when doing this as small particles can be propelled through the air and can get into the eyes. At the very least, the dirt can be blown onto other machines and work. 

After cleaning, each machine should be lubricated to ensure smooth operation. For those machines that are self- lubricating, check the level and condition of the oil in the reservoir. For these machines, a number 1 white oil that has a higher viscosity should be used. Depending on the amount of use, the oil should be changed every 6 months to a year. In no case should the oil be changed less than once a year. For machines that require manual lubrication, a number 2 white oil should be used as it has a lower viscosity to better adhere to the moving parts. This should be done daily at the end of the workday. Oiling the machine at this time allows the oil to seep downward through the mechanisms and collect on the bottom. 

In the morning before use, take a clean rag and wipe off the excess oil so it does not stain the parachute materials. Pay particular attention to the shuttle race. Keeping this well lubricated ensures smooth operation and a quieter machine. One item that tends to get overlooked is the bobbin winder. The shaft of the winder has a small hole in the top and a drop of oil should be added at least once a week to keep it free. 

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