I’m fairly new to woodworking and inherited my dad’s old Delta 6” bench jointer. I started using it about two months ago and noticed that while most wood was glassy smooth and flat, there was about a 3/4” raised section on every board. I noticed a very worn section on both knives in the same area and bought some new knives.
I just finished installing the new knives yesterday and I followed an article in Wood magazine to the tee. I made sure that both cutter heads would move a piece of MDF back about 1/8”, on both sides of the cutter head. My first few test pieces seem very rough when passing the wood through. Though most is smooth, there are some areas with a different look than before…hard to explain. I’ll add a picture and hopefully that’ll help.
I’m wondering if I got used to passing the wood through too quickly before and now the new knives are really biting a lot more or what? I tried to go slower and get the same. I also reduced the depth from 1/32” to even less than that (1/48”?) and it takes many more passes but seems smoother. I also have it on the lowest setting and follow the recommendations on the dial by work piece thickness, etc. The old setting was 1/32” for everything, recommended by The Wood Whisperer, and I would like to get back to that more efficient depth of cut. Anybody else have a similar experience? Is there such a thing as a ‘breaking in” stage with new blades? Seems like that would be ridiculous.
Remember, I’m new to this so be gentle, but any feedback would be much appreciated. Thanks in advance people!
-- It's a BEAUTIFUL day to go cut some wood & build something!