Michael Gabbay
12-30-2005, 12:57 PM
I'm having some jointer issues with my 6" Bridgewood... :confused:
I was milling some poplar earlier this week. A couple of 6' boards were bowed along the length. My normal technique is to place the concave side down so the the high points are at the ends. I made a few light passes (1/32) until the whole board was being cut. So, I thought the board was flat. After checking for flatness against a straight edge (ripped 3/4 birch ply on edge), the piece was still bowed.
My next step was to check the tables. The outfeed table was checked for coplaner with a 24" LV steel straight edge. It was basically dead on. Then I check for any sagging on the outfeed side. Using the infeed table as my reference point, I placed a few inches of the straight edge on the infeed side and pressed down to check the outfeed side. The outfeed was off by .004. I also reset the outfeed height and reran the board. It still has a bow. :mad:
So, could the .004 sag in the outfeed be causing it? Is it the nature of poplar being springy? I try to run my boards with just enough pressure on the outfeed side to pull the board across and take very light cuts.
Thanks, Mike
I was milling some poplar earlier this week. A couple of 6' boards were bowed along the length. My normal technique is to place the concave side down so the the high points are at the ends. I made a few light passes (1/32) until the whole board was being cut. So, I thought the board was flat. After checking for flatness against a straight edge (ripped 3/4 birch ply on edge), the piece was still bowed.
My next step was to check the tables. The outfeed table was checked for coplaner with a 24" LV steel straight edge. It was basically dead on. Then I check for any sagging on the outfeed side. Using the infeed table as my reference point, I placed a few inches of the straight edge on the infeed side and pressed down to check the outfeed side. The outfeed was off by .004. I also reset the outfeed height and reran the board. It still has a bow. :mad:
So, could the .004 sag in the outfeed be causing it? Is it the nature of poplar being springy? I try to run my boards with just enough pressure on the outfeed side to pull the board across and take very light cuts.
Thanks, Mike