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bandsaw alignment changes with position of upper guide

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Forum topic by JesseTutt posted 09-16-2012 04:33 PM 1336 views 0 times favorited 7 replies Add to Favorites Watch
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JesseTutt

853 posts in 1577 days


09-16-2012 04:33 PM

Topic tags/keywords: question bandsaw alignment grizzly

When I got my new Grizzly G513×2bf bandsaw I aligned the upper and lower bearings so that when I turned the blade manually none of the bearings would turn. I did this with the upper guide about 12 inches above the table.

Yesterday, I was playing around and cut some thin strips of 3/4” material on the BS. I lowered the upper guide to about 1” above the table. During the cut I noticed considerable drift of the blade. I raised the upper guide and checked alignment and everything looked good. But I would still get drift. Then I noticed that with the upper guide 1” above the table the blade was constantly rubbing on the right bearing.

After investigation I found that as I raise and lower the upper guide the distance between the blade and the side bearings change. If I correctly adjusted (the blade barely not touching any bearing) for resawing a 10” thick piece of wood when I lower the upper guide the gap between the blade and the right bearing decreases, and the gap between blade and left bearing increases. This leads me to theorize that the upper guide assemble is angled toward the left.

What do you think?
How should I correct this problem?

-- Jesse, Saint Louis, Missouri


7 replies so far

View Surfside's profile

Surfside

3389 posts in 1640 days


#1 posted 09-17-2012 02:19 PM

I can’t seem to grasp an idea on how to solve your problem. But the first thing you should do is to read the manual of your saw. There should be some information on that manual on how those bearings work.

After that, watch this video: http://www.finewoodworking.com/ToolGuide/ToolGuideArticle.aspx?id=34055 .

-- "someone has to be wounded for others to be saved, someone has to sacrifice for others to feel happiness, someone has to die so others could live"

View mcase's profile

mcase

446 posts in 2595 days


#2 posted 09-18-2012 03:54 AM

My Powermatic does the same thing. When you raise or lower the upper bearing arm it shifts in relation to the blade. Mine moves to one side a bit, but also It also moves forward and I have to readjust the thruster bearing as well. Its called poor quality control.. You bought a Grizzly which is known for good prices. I bought a Powermatic which tries to foster a myth of high quality at a higher price. Powermatic quality is largely a myth though. You might argue that Grizzly quality is reflected in the price, but that Powermatic’s price is not reflected in their quality.

View Lee Barker's profile

Lee Barker

2170 posts in 2316 days


#3 posted 09-18-2012 04:18 AM

Here is a way to minimize the effects of what appears to be an inaccuracy in casting:

Remove the table. It’s quite easy: remove the two adjusting knobs, the blade insert and the tapered plug and lift the table up and off.

Now you can very easily adjust your guide bearings in concert instead of one at a time.

This should help some. If there’s an alignment problem that’s integral to the frame, that’s tougher to get perfect.

Meanwhile bear in mind that most misbehaviors in a bandsaw are attributable to the blade and the tension thereon.

Kindly,

Lee

-- "...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 Sylvain's profile

Sylvain

639 posts in 1965 days


#4 posted 09-18-2012 12:04 PM

I remember somebody having a similar problem here on LJ.
The casting was properly machined but there was a blob of paint on the guiding surface of the upper guide.

Scraping the blob solved the problem.

-- Sylvain, Brussels, Belgium, Europe - The more I learn, the more there is to learn

View William's profile

William

9906 posts in 2308 days


#5 posted 09-18-2012 12:13 PM

I’ve owned two different bandsaws with this exact same problem.
The upper guide assembly is out of line.
This can be fixed several different ways, depending on the saw.
Some have adjustments built in.
Some have to be shimmed.
Some you just have to live with.
Read you manual.
If that doesn’t help, take it apart and see if you can figure how what to do about it.
I’m sorry I don’t have a more definate answer.

-- http://wddsrfinewoodworks.blogspot.com/

View JesseTutt's profile

JesseTutt

853 posts in 1577 days


#6 posted 09-18-2012 01:17 PM

Surfside, I read the manuals and tried following the book to align the bandsaw. Thanks for the video.

Mcase, I am sorry to hear that you are having similar problems.

It looks like the top assemble (bearings, blade guard, etc) is held in place with four screws. I was thinking about loosening a couple of these and see if I could tap on it and get it to pivot a few thousandths and correct the issue. What do you think?

-- Jesse, Saint Louis, Missouri

View Surfside's profile

Surfside

3389 posts in 1640 days


#7 posted 09-18-2012 01:48 PM

Can you tighten up the upper guides a little bit so it wont go left? Then re-adjust the side bearings after adjusting the upper guides.

-- "someone has to be wounded for others to be saved, someone has to sacrifice for others to feel happiness, someone has to die so others could live"

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