Unwanted slightly curved cuts on cabinet saw
I’m a relatively new wood worker who has “dialed-in” my table saw to very close tolerances, or so I believe. I am getting slightly curved cuts when ripping. The cuts seem to be shallower in the middle and flare out at the ends, with the total variance around 1/64 of an inch. Although not disastrous to my case goods, when gluing up large panels of solids the gap is embarrassingly noticeable. The possible culprits could be how I’m feeding the material, friction on the fence, friction on the outfeed table, choice of blades (60 tooth ATB & 1 1/2″ HP motor) or similar novice mistakes. Can anyone please share some tips for me to rectify this problem? Thanks in advance and I look forward to your responses.
Replies
Table Saw Tips
It could be any of those issues you mention.
Here's two things to help sharpen up your skills :
After you set the fence - measure from the inside of the fence to the first dado slot in the table both from the front and back ends of the fence - compare measurements to see if the fence is parallel - then check from the fence to the front tooth and back tooth of the blade.
Second - run a few pieces through with a feather board and see if the cuts improve -
SA
Mayber the lumber ?
Are you getting this type of cut on many boards of just one ??
If it's just one board, you may have reaction lumber.
The featherboard idea is a good tip, I thought I was pretty good at even and constant feed rate. Till I tested a magnetic featherboard at work. Got a much better cut with it.
Is your fence straight? If it is bowed slightly, away from the blade, you will get boards that are wider at each end than in the middle. I speak from experiance on this one.
That's why a jointer is preferred to complete the preparation of boards to be glued up. For that matter, unless the boards have been jointed on one edge before sawing the problem could stem from warps in the boards before sawing.
By the way, you have a contractor's saw, not a cabinet saw, not that it's particularly relevant in this case, though there is greater chance that it has gotten out of alignment, or that the fence either flexes too much or is itself curved.
1/64" does not indicate any
1/64" does not indicate any problem. What is a problem, or likely could be, is the dangling power cord to your saw. Its in a place where you may very likely trip over it at just the wrong time thus losing a 64th or more from a finger. Tape it up out of the way.
Thanks
The culprit is a fence that is bowed by 15 thou....which is my estimate of 1/ 64" off as measured with a feeler gauge. When I look down the length, sure enought the slight bow in the fence matches the slight bow in the wood. My sincere thanks to all those who commented.
Fence
a simple fix may be to add a wood strip onto the metal fence and shim where necessary -
SA
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