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Band Saw Thrust Bearings

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Forum topic by Hopdevil posted 1210 days ago 1658 views 1 time favorited 5 replies Add to Favorites Watch
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Hopdevil

178 posts in 1687 days


1210 days ago

Topic tags/keywords: question bandsaw

Probably a simple question…

Why do some types of bandsaws have the thrust bearing set perpendicular to the blade, and some are in the same line as the blade. Is there an advantage to one vs the other? It seems strange that some (including my grizzly) are perpendicular with the blade touching the side of the bearing rather than the edge of the bearing so that the bearing can rotate.

Yeah, I obsess about the little stuff.

-- Buzz ---- Message sent from the End of the Internet.


5 replies so far

View Lee Barker's profile

Lee Barker

2163 posts in 1451 days


#1 posted 1210 days ago

All the saws I’ve seen have the stock backing bearing at right angles to the blade. The only ones I’ve seen parallel, or edge-on to the blade, are the Carter aftermarket units. They have a groove milled in the wheel (with a concentric bearing within) in which the back of the blade rides.

Is that any help?

-- "...in his brain, which is as dry as the remainder biscuit after a voyage, he hath strange places cramm'd with observation, the which he vents in mangled forms." --Shakespeare, "As You Like It"

View crank49's profile

crank49

3338 posts in 1572 days


#2 posted 1210 days ago

I never did understand the “sidewinder” type bearing. It applies the load in the bearing’s weakest direction and it adds friction by constantly scrubbing the back of the blade.

-- Michael :-{| “If you tell a big enough lie and tell it frequently enough, it will be believed.” ― A H

View swirt's profile

swirt

1935 posts in 1573 days


#3 posted 1209 days ago

My 14” Craftsman has the rear thrust bearing set parallel to the blade so the back edge of the blade runs along the roller. Works well. Not sure why the others put them on sideways.

-- Galootish log blog, http://www.timberframe-tools.com

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DrDirt

2359 posts in 2343 days


#4 posted 1209 days ago

I was told that the sideways bearing doesn’t mess up the blade tracking, where the bearing ‘rolling’ at the back will develop a grove and the blade will want to drop into that groove independant of the tension and guide block adjustment. while there would be no permanent wear pattern on the perpindicular version.

the carter grooved roller is usualy for scrolling without any side guides so that you can turn really tight.
Obviously there is a lot more friction running sideways to the load. But their aftermarket units also replace the guide blocks with bearings.
Maybe it is better – but the demo Michael Fortune gave showed that the gadgets were a waste of money as he tuned a stock 14” delta to prove his point.

I believe him because (a) he seems to know his stuff, and (b) his point wasn’t to get me to buy anything – there was no vested interest for him to support or oppose aftermarket guides.

Doesn’t mean he’s right either….....but his point of view is that we don’t need half the stuff out there on the market that proposes to make us automatically better woodworkers right out of the box.

-- "If we did all the things we are capable of doing, we would literally astonish ourselves." Edison

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Hopdevil

178 posts in 1687 days


#5 posted 1209 days ago

Thanks all!

DrDirt, that makes sense regarding the wear. It just seems a strange way to do it. You would think they would design a special type of bearing with more wear surface or something. I guess that is why I’m not an engineer! ;-)

-- Buzz ---- Message sent from the End of the Internet.

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