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Bandsaw Kerf Cut Accuracy

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Forum topic by one60fourth posted 12-16-2017 03:52 PM 385 views 0 times favorited 3 replies Add to Favorites Watch
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one60fourth

33 posts in 1707 days


12-16-2017 03:52 PM

I have a 14” Powermatic band saw with a 4TPI Wood Slicer blade from Highland Woodworking. I’m currently making a hardwood jewelry box with modified 3/4” wide finger joints. To do that, I’m making 3/8” + 1/16” deep finger cuts (my sides are 3/8” thick with 1/16” beveled reveals at the corners of the box) on the ends of each side board. And then using the band saw and a chisel to remove waste sections. I’ve noticed three things:

1) looking down on the face of each board (birds eye view) the cut lines are straight as expected
2) looking at each cut from an end grain view the cut is cupped. The outside walls of the cut are straight but the inner walls of the cut are slightly convex shaped.
3) the width of the kerf (from birds eye view onto the face) on the portion of the board that faced up when the cut was made is significantly wider than the kerf on the portion of the board that faced down during the cut.

Shouldn’t the kerfs on the top and bottom of each cut be the same width? And shouldn’t both walls of each cut, when seen from the end (i.e. end grain view) be perfectly straight?

Does my saw or blade need some sort of adjustment?

Any thoughts would be appreciated.


3 replies so far

View Bill White's profile

Bill White

5047 posts in 4075 days


#1 posted 12-16-2017 04:05 PM

Blade tension and sharp blade.
Bill

-- bill@magraphics.us

View one60fourth's profile

one60fourth

33 posts in 1707 days


#2 posted 12-16-2017 08:31 PM

Thanks Bill. My tension’s pretty good but it has been awhile since I did a full tune-up. The blade isn’t that old and cuts well so I think it’s plenty sharp. But the tension and overall alignment could be less than perfect.

View MrUnix's profile

MrUnix

6882 posts in 2314 days


#3 posted 12-16-2017 08:35 PM

Blade tension and guide adjustment. Have you watched the obligatory band saw tune up video yet?

Band Saw Clinic with Alex Snodgrass

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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