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Bandsaw guide question

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Forum topic by Lumpy63 posted 01-19-2021 02:09 PM 224 views 0 times favorited 5 replies Add to Favorites Watch
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Lumpy63

7 posts in 43 days


01-19-2021 02:09 PM

I just got a new Jet JWBS-14SFX bandsaw, and I have a question. After tensioning and tracking the blade (1/2” Jet blade, 4 tpi), and squaring the table to the blade, I lowered the cutting height to the minimum (about 1/4” above the table) and adjusted the upper guides to almost touch the blade. I then raised the cutting height to the maximum (about 13”) and rechecked the upper guide clearances. The upper thrust bearing gap went from about 0.0025” at minimum cutting height to about 0.044” at maximum, as near as I could tell with feeler gauges. The front lateral guide bearing gap went from about 0.008” to about 0.055”. Is it normal for the gaps to change this much from bottom to top of the cutting height range? Am I missing something as far as setting up the saw? I tracked the blade in the center of the top wheel. Thanks for any help. I did try to search for answers first, but maybe I didn’t use the right search terms because nothing came up.


5 replies so far

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Kudzupatch

118 posts in 2217 days


#1 posted 01-19-2021 03:01 PM

No you are not missing anything. The changes are seeing are miniscule for a this type of machine. This is a woodworking machine and not a precision metal working machine. To get that sort of accuracy, which is not required to cut wood, would at least triple the cost of the bandsaw if not more.

Toss the feeler gages and cut some wood and see how it cuts. If it cuts well, it is good enough.

I come from a metal working background and there is way to much emphasis on precision that is just not possbile, much less needed, to cutting wood.

-- Jeff Horton * Kudzu Craft skin boats* www.kudzucraft.com

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Bstrom

312 posts in 182 days


#2 posted 01-19-2021 04:28 PM



No you are not missing anything. The changes are seeing are miniscule for a this type of machine. This is a woodworking machine and not a precision metal working machine. To get that sort of accuracy, which is not required to cut wood, would at least triple the cost of the bandsaw if not more.

Toss the feeler gages and cut some wood and see how it cuts. If it cuts well, it is good enough.

I come from a metal working background and there is way to much emphasis on precision that is just not possbile, much less needed, to cutting wood.

- Kudzupatch

Agreed. Bandsaw cuts require further finishing (planing, sanding, etc.) like nearly every other power tool in the shop. If you can resaw at the maximum height and get consistent thicknesses your saw is in pretty good shape. That’s my acid test anyway…

-- Bstrom

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Rich

6526 posts in 1598 days


#3 posted 01-19-2021 04:42 PM

Obviously your blade is not tracking at the same vertical angle that the upper thrust bearing moves at as you raise and lower the guide. If it were, the gap wouldn’t change.

Fortunately, it doesn’t matter. A band saw is not a set-it-and-forget-it machine. It’s a good idea to check your guide bearings each time you change the set up for a new cut.

-- Half of what we read or hear about finishing is right. We just don’t know which half! — Bob Flexner

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splintergroup

4669 posts in 2231 days


#4 posted 01-19-2021 04:43 PM

If it really bugs you, you need to adjust the blade guide column so it is parallel to the blade (perpendicular to the table).

Usually any adjustments are with oversized bolt holes and clamp bolts, which are notorious for shifting around when being tightened. You may end up making it worse, but generally once it is set it won’t move over the life of the saw.

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Lumpy63

7 posts in 43 days


#5 posted 01-19-2021 05:16 PM

Thanks for the advice, I appreciate it. I won’t worry about it then.

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