Can’t get my planer to cut straight.

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Golfer4588
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Can’t get my planer to cut straight.

Postby Golfer4588 » Thu Mar 21, 2019 11:18 am

Hi,

I have a Luna w64 combination machine and am having a problem with the planer.

I realise this subject has come up quite a few times but I have tried every suggestion I could find.

I am trying to joint 3 pieces of oak for a small table top, each piece approx 1000mm x 240mm x 110mm.

No matter what I try, the cut is always concaved.

When 2 pieces are put together, there is an approx 1mm gap in the centre.

I have checked the in/outfeed tables are coplanar. I only did the straight edge test with 2 different straight edges and I’m pretty confident that things are ok.

I’ve tried many different blade heights from a few tho below outfeed table to a few tho above and everything in between. Ended up sticking with a hair higher than the outfeed table.

There is absolutely no give in the oak so I don’t think it’s a pressure issue but I’ve tried many different timbers and get the same results every time. As soon as the piece is on the outfeed table, I concentrate the pressure there.

It’s incredibly consistent because I tried covering the entire surface with pencil and making the shallowest cut I could and the knives removed all the pencil every time. The sound of the knives cutting is very consistent for the entire cut.

I have run out of things to try so any help would be very much appreciated.

I’m pretty new at this and hopefully, I’m making a schoolboy error!

Maybe a good service wouldn’t hurt? I’m based in Hollywood just South of Birmingham if anyone could suggest anyone?


Richard

9fingers
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Re: Can’t get my planer to cut straight.

Postby 9fingers » Thu Mar 21, 2019 10:34 pm

Your blade height sound right to me and so does your technique of pressure transfer.
I think it can only be lack of coplanarity.

Bob
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Golfer4588
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Re: Can’t get my planer to cut straight.

Postby Golfer4588 » Fri Mar 22, 2019 6:05 am

Thanks Bob,

I'll check it again.

Jonathan
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Re: Can’t get my planer to cut straight.

Postby Jonathan » Fri Mar 22, 2019 7:15 am

Many manufactures send machines out ready to plane a spring joint ....
Try setting in and outfeed level with each other, then check the tops for flatness .....if this shows a very slight concave you will get a spring joint


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