I'm having a hard time getting my milled lumber to stay flat for my woodworking projects, particularly when I'm working with thinner boards like 1x3 and 1x2. I'm tired of dealing with the bowing I get from S4S materials, so I decided to start milling my own dressed stock. Here's my process: I let rough lumber sit in my shop for a few days before I start. On the first day, I join one face and one edge using my 8" x 76" helical jointer. However, I still notice a slight bow (about 1/32" to 1/16") in the jointed face, especially on longer boards over 3 feet. I feel like I'm doing everything right, but there's a lot of friction when pushing larger boards through the jointer, even though I've waxed it. On day two, I plane down to the final thickness of 3/4" and rip to a width of 2.5". Here's where it gets frustrating: even after getting some boards perfectly flat off the jointer, they seem to warp significantly afterwards, like they're ready to be turned into whiskey barrels! I'm unsure how to achieve straight and flat boards. Any tips for dealing with this bowing issue?
3 Answers
It sounds like you're really putting in the effort! A couple of things to consider: first, check how dry your lumber is, as moisture levels can really affect stability. Also, when you're running boards through the jointer, try taking smaller bites—if you're already at 1/64" to 1/32", that should help reduce friction. Making multiple passes with a lighter touch might yield better results!
A good practice is to stack and sticker your rough-sawn boards and let them relax for a few days. This helps with moisture equilibrium and can minimize warping. Also, always confirm the moisture content—especially if you're sourcing from larger stores.
Bowing can happen after milling due to internal stress in the wood. Try to rough cut your boards to size before jointing and planing. This can release some of that tension and help you end up with straighter pieces. Don't forget to check for good grain patterns before purchasing wood too!
I agree about checking the moisture content! Sometimes even the best quality lumber can have hidden stress that causes warping after you mill it. Make sure to let it acclimate in your workspace for a few days. That's helped me a lot!