Need advice on choosing a grinder for my deck project

Hey all, I'm planning to build a new deck next month and I've got a lot of cutting and grinding to do on some old concrete and metal. I've been looking at angle grinders but I'm not sure what to get. I'm on a budget, but I want something that'll last. Any recommendations between a corded or cordless model? Also, what disc size should I get for cutting through rebar and concrete? Thanks in advance!

Hey Tim, welcome to the club! For a deck project, you're gonna want a grinder that can handle some serious work. If you're on a budget, I'd go with a corded 4-1/2" grinder from a reputable brand like DeWalt or Makita. They're workhorses and won't break the bank. Cordless is convenient but you'll need a few batteries and a good charger, which hikes up the price. For cutting rebar, get a diamond blade for concrete or a cut-off wheel for metal. 4-1/2" is the sweet spot for versatility. I've got one that's survived 15 years of abuse. Just make sure you wear your PPE – dust and sparks are no joke.

I second Steve's advice. For a one-off project, corded is the way to go – cheaper, more power, no battery anxiety. But if you're planning on more DIY in the future, investing in a cordless system might be worth it. I've got a Milwaukee M18 FUEL 4-1/2" and it cuts through anything, but it's pricey. If you're on a budget, I'd also look at Bosch or Porter Cable. Whatever you get, make sure it has a paddle switch – safer in case you drop it. And like Steve said, get a few different discs: a grinding disc for metal, a diamond blade for masonry, and maybe a flap disc for finishing. Also, consider a laser or LED light if you work in dim areas. Good luck!

Thanks Steve and Felix! I think I'll go with a corded Makita – I've heard good things about their grinders. I've got a question about the paddle switch – I've seen some with a toggle switch. Is the paddle really that much better? And how do I know which disc to use for what? I don't want to mess up and ruin something.

The paddle switch is a safety thing, Tim. If you lose your grip, your hand comes off the switch and it stops immediately. With a toggle, it stays on and can run away from you – that's a recipe for disaster. So yes, worth it. As for discs, color-coding often helps. Look for grinding wheels that are usually darker and tough (for metal), cutting wheels are thin and often have a metal reinforcement, and diamond blades have a gritty rim and are for masonry. The packaging will usually say. Just start with a grinding wheel for most metal removal, a cut-off disc for cutting bolts/rebar, and a flap disc if you need a smooth finish. Always check the max RPM on the disc vs your grinder's RPM – don't go over. Stay safe!

Good info, Steve. Tim, also don't forget to use a guard – some guys take it off for visibility, but it's not worth the risk. And if you're cutting concrete, you'll want a dust shroud and a shop vac to keep the dust down – that stuff is nasty to inhale. Let us know how the project goes!