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band saw blade guard not moving perfectly straight?

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Forum topic by dbw posted 05-28-2016 12:07 PM 518 views 0 times favorited 14 replies Add to Favorites Watch
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dbw

143 posts in 1099 days


05-28-2016 12:07 PM

Topic tags/keywords: band saw blade guard

Folks,
I bought a Craftsman Professional 14” BS on CL. While tuning it up I noticed that the blade guard was moving straight up and down. Here is what is happening: the distance between the guide bearings and the blade changes as I raise/lower the blade guard. As I raise it the distance between the blade and the rear bearing increases, the distance between the blade and the left bearing decreases, and the distance between the blade and the right bearing increases. The opposite is true as I lower the guard. The guard appears to be straight and there is no binding through the entire travel. Does anyone know what causes this and, more importantly, how to fix it?

-- measure 3 times, cut once


14 replies so far

View Nubsnstubs's profile

Nubsnstubs

826 posts in 1192 days


#1 posted 05-28-2016 02:50 PM

How does it cut, or have you tried that yet?.......... Jerry (in Tucson)

-- Jerry (in Tucson)

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dbw

143 posts in 1099 days


#2 posted 05-28-2016 03:08 PM

it cuts well. FYI there is no vibration and there are no weird noses. It runs smooth as silk. If I can solve this problem I believe I got a good saw especially since it’s a Craftsman.

-- measure 3 times, cut once

View johnstoneb's profile

johnstoneb

2143 posts in 1635 days


#3 posted 05-28-2016 03:11 PM

That is one reason why they make the guide bearings and blocks adjustable. While it is desirable to be able to adjust once for a blade it isn’t always possible. Tune it to the best of your ability and you may be able to reduce the adjustments needed. Band saws are not precision instruments and there is slop almost everywhere. Usually a good tuneup will reduce or eliminate most of it.

-- Bruce, Boise, ID

View ArtMann's profile

ArtMann

132 posts in 278 days


#4 posted 05-28-2016 05:15 PM

I have what I believe to be the same band saw, based on your comments. I will be perfectly honest. The saw is manufactured by Rikon and is cheaply made. The guard must be made to travel up and down exactly parallel to the blade and that takes some very careful shimming. Be prepared to take a few hours of trial fitting to get it right. I just leave mine set to 1.5 inch cutting height and adjust the guides for that setting. I only use this saw for curve cutting on 1 inch and thinner wood. I have another saw I use for resawing. By having two saws, I eliminate the tedious job of swapping blades all the time.

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dbw

143 posts in 1099 days


#5 posted 05-28-2016 05:41 PM

Thanks for your input. I’m going to set it and (almost) forget it until I change blades for resawing.

-- measure 3 times, cut once

View runswithscissors's profile

runswithscissors

2183 posts in 1487 days


#6 posted 05-29-2016 12:30 AM

I don’t understand what the blade guard has to do with your issue. Usually the blade guides are mounted on a post that goes up and down. It’s that post that should stay true and lined up as it moves. The guard is merely to keep you from cutting all your fingers off at once.

Maybe there’s something about the C’man that I don’t understand. Are the blade guides in fact mounted on the blade guard?

-- I admit to being an adrenaline junky; fortunately, I'm very easily frightened

View RussellAP's profile

RussellAP

3059 posts in 1749 days


#7 posted 05-29-2016 02:37 AM

The post where the upper blade guide assembly rests can twist a bit when you raise and lower it. Mine used to have a ball bearing in it to keep it true, but that fell out when I installed a riser kit. Now I just give it a visual when I raise the bar to make sure it’s between the bearings.

-- A positive attitude will take you much further than positive thinking ever will.

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dbw

143 posts in 1099 days


#8 posted 05-29-2016 03:56 AM

Runswithscissors: the post is not running true. It moves in two directions as it is raised/lowered.

-- measure 3 times, cut once

View mrg's profile

mrg

659 posts in 2462 days


#9 posted 05-29-2016 10:20 PM

You sure it’s the guard and not the blade that is cocked? If the the blade is angled on the wheels you will get the same thing, it doesn’t take much.

-- mrg

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dbw

143 posts in 1099 days


#10 posted 05-30-2016 05:08 AM

how can I check if it’s the blade vs. the post?

-- measure 3 times, cut once

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mrg

659 posts in 2462 days


#11 posted 05-30-2016 01:26 PM

Take a square and place on the table behind the blade to see if it’s square to the table. If it’s not square in this direction your not tracking straight on the wheels. Readjust

I have this saw and it works ok for what I use it for. I’ll look to see if my guide is runs up and down straight. Does it straighten when you tighten it?

-- mrg

View ArtMann's profile

ArtMann

132 posts in 278 days


#12 posted 05-30-2016 05:37 PM

There is absolutely nothing you can do with the blade to make it travel in a different direction if the blade guides don’t travel up and down parallel to it. You must shim the rack and pinion assembly that goes up and down with the blade guides and guard. The tilt of the table has nothing to do with your problem.


how can I check if it s the blade vs. the post?

- dbw


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dbw

143 posts in 1099 days


#13 posted 05-30-2016 06:06 PM

I does not straighten when I tighten it.

-- measure 3 times, cut once

View mrg's profile

mrg

659 posts in 2462 days


#14 posted 05-31-2016 12:20 AM

I took a look at mine and the assembly has some play but goes up and down pretty much straight. When I get the bearings to the height and tighten the assembly straightens right out.

Look at the assembly as ArtMann suggested maybe you just need to adjust it. These machines are simple machines.

-- mrg

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