Heavy Duty Saw Motor, Saw-1/Saw-2 115v
	Quantity in Basket: None Catalog No.: SAWMOTOR Price: $269.00 Shipping Weight: 3.00 pounds 2 available for immediate delivery
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This is a heavy duty DC motor for the Corbin SAW-1 and SAW-2 tubing cutter saws. The saws have been discontinued for some time, but we still provide parts and support for the many clients who are using them, and expect to do so as long as there is demand for it. The saw is complete with brushes and slide-on connectors. It requires a rectifier, which is available separately. Check the one that is on your saw before plugging in and trying to run a new motor. Unplug the saw from power before attempting this! The rectifier is a standard "bridge" type with four diodes encapsulated in a square heat-sink block. It has four connectors. Two are for the AC coming in (line) and two are the DC output. The DC output is polarized: that is, one post is negative and one is positive. The motor needs to be connected to them so it runs in the correct direction. Looking at the blade and shaft from the left side (where the copper tube is fed into the saw), the blade needs to turn clockwise. The teeth face down toward the copper tube, and rotate so that the teeth bite into it, rather than dragging upward from the bottom side against the back of the teeth -- it might still gum its way through the tube that way, but it will get hot and make a poor cut! The saw blade needs to be mounted so the teeth point down, toward the work, at the front. A shorted rectifier can damage the motor or even destroy the windings in it. Be certain to have a qualified electrician check the rectifier with an ohm meter. The measurement across the two AC or INPUT or LINE connectors (all the same thing, different terms) should read almost infinite or very high resistance regardless of which polarity of measuring probe is used on the two connectors. The resistance measured between the DC output terminals or connectors will depend on which probes are applied to the positive and negative terminals. With one polarity from the meter, a very low resistance should be measured. Exchanging the probes on the terminals should give a very high resistance, almost infinite. Measuring from one of the AC input terminals to the plus (or to the minus) DC output terminal will either give a low resistance, or a high one, depending on the direction in which the probes are connected to the terminals. You are reading across one diode, which passes current one way but blocks it with the polarity reversed. These readings should be about half what you get for the low resistance compared to measuring across both output or DC terminals, regardless of which input and output terminal pair you select. When you measure across the output terminals, you are reading through a pair of diodes. And the high resistance should also be about half but it might be so high you can't tell any difference (half of infinite is still pretty high!). If ANY measurement gives you a zero or very low reading that is also zero in the other direction, then the rectifier has a shorted diode and must be replaced. If any of the input to output terminals reads very high or infinite resistance in both directions, than the diode between them is burned out and open. The motor might possibly run but it would get half the power, only getting half of the cycles of the input current. Not a good idea to run it that way. Replace the rectifier.