I'm using a DeWalt DWE6423K random orbital sander connected to a nearly new Rigid WD1060 shop vac for dust collection, and I'm running into a problem. When I start the sander and then turn on the vacuum, I notice a significant drop in the sander's RPM and power, almost as if it's bogging down or reducing speed without any pressure on it. I'm no expert on electrical issues, but my garage has a 220v rotary hoist, so I figured there'd be enough power to run both tools at once. I've tried various setups, like using a heavy-duty extension cord, plugging them into the same outlet, and even using separate outlets, but I still get the same power loss with the sander. Interestingly, I didn't have this issue with my old, worn-out shop vac, even though it was weaker at 3 or 4hp compared to the Rigid's 6hp. Some folks suggested that a more powerful vacuum could create extra suction that affects the sander, but I don't think that's the case since I hear the drop even when the sander isn't touching anything. I could be missing something really simple here, so any insights would be appreciated!
4 Answers
It sounds like the suction from the shop vac is pulling too much air through the sander, even when it's not in contact with any material. Sanders generally don’t need a lot of suction, so it’s possible that the stronger vacuum is making it struggle. If it only slows down when the vac is on, that might be your culprit.
Try disconnecting the vacuum hose while both machines are running. If the sander's RPM goes back to normal, that would confirm that the vacuum is the issue. Also, check if both tools are on the same circuit. If they are, you might be overloading it, which can cause voltage drops and reduce performance. Consider looking at the required amperage and compare it to what's available on that circuit.
It's also worth checking the extension cord you're using; if it's not rated for the power you're pulling, it could cause issues. Remember, having enough power at 240v doesn't help your 120v setup. Voltage isn't the only thing to consider—the amperage and the capability to deliver it matter too. If the required amps can't be delivered, your tools will lag.
Good point! Always check the circuit’s limits. If you're asking too much, it might be time to adjust how you set things up.