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Running curved stock on molder

4/17/23       
Dave Edgerton  Member

So we have our molding machine running very well now good knives good feed rate all that stuff. The problem I'm having now is trying to straighten material on the molder. Typically for what we need the maximum length that I'm running is about 6 ft and 3 in wide. We Mill rough four quarter Lumber down to 3/4 of an inch and typically we will run this material through two times. The first time we will take 2 mm off the bottom and 1 mm off the top to straighten the piece of wood. We have a low pressure on the first hole down roller so that it doesn't bend the wood down. The second pass we will take one and a half millimeters off the bottom and one and a half millimeters off the top to give us a final dimension of 20 mm. After the first pass the stock comes out quite straight. After the second pass the stock generally is not straight on the wide face and we have a curve to the wood. I included a picture just to show one is the first past two is the second pass and three is the resulting material. I don't know if I'm doing something wrong but maybe somebody can guide me.


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4/19/23       #2: Running curved stock on molder ...
Joe Calhoon Member

Dave, working down lumber from the rough do you let it set at least over night before the second pass? I have had this happen before when milling from rough in one day.

4/19/23       #3: Running curved stock on molder ...
Dave Edgerton  Member

Thank Joe, come to thinkl of it we had some oak that sat for 2 days after first milling and it was nice an straight. Typically we mill to dimension in one go. Maybe that will help to balance humidity. The worst is the northern cherry and hard maple.

4/20/23       #4: Running curved stock on molder ...
Dustin J Orth

Another thought is if the heads are just slightly out of alignment with the fences, even just a few thou can cause issues. Also the feed system rollers can be over angled in relation to the fences.

4/20/23       #5: Running curved stock on molder ...
Dave Edgerton  Member

I should clarify the drawing is looking from the side and the cutter drawn is the bottom head.

4/21/23       #6: Running curved stock on molder ...
Dustin Orth

Ok, I see what's going on. Try this, take a wide board and split it, run one of those face up per se, the other face down. Do your normal process and then see if the cup is the same or opposite therefore eliminating a material issue. Are you putting first roller pressure at all during both cuts? What are you changing between runs? That might lead you to why the difference.

4/22/23       #8: Running curved stock on molder ...
Jason

On your 2nd pass try taking more off the top. This will relieve more stress on that side and should help.
Also, instead of 2 passes if you have a jointer try a few light passes by hand to flatten the board before running it through the moulder.


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