Blade Gone Bad, MAYBE??

[dusty]

I previously reported that I thought I had a blade that had gone bad. I suspected that because I was getting a very rough edge when ripping that I had not experienced before.

I am still getting that rough cut but only with one blade and arbor. I have installed and tested four other blades, one just resharpened by Forrest. The resharpened blade performs as you would expect. The others are reasonably good.

From this I have concluded that my real problem has been isolated to a blade and arbor set.

What has been bothered is that the day before this set of symptoms began to occur, I had good performance (nice clean cuts). So what happened.

I set out today to measure runout on the blade. I am getting some quirky readings so I am seeking opinions on my test set up.

Please note that I am taking my readings on the very edge of the carbide.

Do you see anything inherently wrong with this set up?

6009 6010

[lv2wdwrk]

I previously reported that I thought I had a bad that had gone bad. I suspected that because I was getting a very rough edge when ripping that I had not experienced before.

I am still getting that rough cut but only with one blade and arbor. I have installed and tested four other blades, one just resharpened by Forrest. The resharpened blade performs as you would expect. The others are reasonably good.

From this I have concluded that my real problem has been isolated to a blade and arbor set.

What has been bothered is that the day before this set of symptoms began to occur, I had good performance (nice clean cuts). So what happened.

I set out today to measure runout on the blade. I am getting some quirky readings so I am seeking opinions on my test set up.

Please note that I am taking my readings on the very edge of the carbide.

Do you see anything inherently wrong with this set up?

6009 6010
As a check to determine if your problem is blade or arbor: 1. put the blade on an arbor that gives a good cut and 2. put the arbor on a blade that gives a good cut.
Just a thought.

[tdubnik]

I set out today to measure runout on the blade. I am getting some quirky readings so I am seeking opinions on my test set up.

Please note that I am taking my readings on the very edge of the carbide.

Do you see anything inherently wrong with this set up?

6009 6010

I don't think anything is inherently wrong with your set up. I check for run out slightly different. I set up my indicator inside the teeth on a flat part of the blade and lock the indicator. This way I can rotate the blade without the tip of the indicator falling into the gullets. My method works for a standard runout check but it may not find an errant tooth on the blade.

[dusty]

As a check to determine if your problem is blade or arbor: 1. put the blade on an arbor that gives a good cut and 2. put the arbor on a blade that gives a good cut.
Just a thought.

And a good thought at that.

[dusty]

I don't think anything is inherently wrong with your set up. I check for run out slightly different. I set up my indicator inside the teeth on a flat part of the blade and lock the indicator. This way I can rotate the blade without the tip of the indicator falling into the gullets. My method works for a standard runout check but it may not find an errant tooth on the blade.

I normally check for run out the way you describe. I also use a round tipped adapter rather than the flat tip. I used a flat tip here so as to stay on the corner of the carbide more easily.

[Ed in Tampa]

Dusty
Your set up seems okay.

My problem is what is really causing the problem.

See if I got the facts straight.
Everything including the suspected blade was good a few days ago.
You tried other blades and you don't have a problem.

The reason I keep going over this is I have seen this problem many times
each time with the exception of once the problem was either the table to blade alignment was wrong or the fence to blade was wrong.

The one time I saw a blade do this was with a new Blade, my old blade cut jointer smooth. The new blade left the same pattern marks as your seeing. I never messed with the blade or arbor enough to figure out what was the problem, I simply took the blade back.

I would think to be a blade problem you would have to have a carbide tip off set which couldn't happen over night or the blade got bent.

You said the problem didn't occur a few days ago. Did you change the blade to arbor placement before you noticed the problem?

If not then the blade had to get bent since that is the only thing left.

Unless..... I know you have been working on dust collection, is it possible your table got banged around, something got twisted as you were prodding around under the table, or the fence got bumped?

[dusty]

Dusty
Your set up seems okay.

My problem is what is really causing the problem.

See if I got the facts straight.
Everything including the suspected blade was good a few days ago.
You tried other blades and you don't have a problem.

The reason I keep going over this is I have seen this problem many times
each time with the exception of once the problem was either the table to blade alignment was wrong or the fence to blade was wrong.

The one time I saw a blade do this was with a new Blade, my old blade cut jointer smooth. The new blade left the same pattern marks as your seeing. I never messed with the blade or arbor enough to figure out what was the problem, I simply took the blade back.

I would think to be a blade problem you would have to have a carbide tip off set which couldn't happen over night or the blade got bent.

You said the problem didn't occur a few days ago. Did you change the blade to arbor placement before you noticed the problem?

If not then the blade had to get bent since that is the only thing left.

Unless..... I know you have been working on dust collection, is it possible your table got banged around, something got twisted as you were prodding around under the table, or the fence got bumped?

Well, the title of this thread may be very misleading. It probably should read: "Quality of Rip Cut Gone Bad??"

I have spend far longer on this issue than I should have. That is to say, "I should have resolved this almost immediately".

I have come to the conclusion that I have two problems working simultaneously. That along with some invalid assumptions.

The symptoms did not exist a couple days ago. So, what happened.

SAeveral of you have touched on the problem with great insight. Bent blade, loose arbor, thrown carbide, loose blade - all were good suggestions.

Ed in Tampa, You got me to thinking. While I was working on the saw dust problem, I noticed that the table was no longer square to the blade. With the blade protruding through the insert (ZCI) I loosened the table tilt lock to square it up. It was tight and I had to use some force. With the rip fence still mounted, I lost control of the table and exerted some pressure on the blade (tilting the table) and I might have bent the blade some.

Also, I recall that on occasion I find the arbor set screw a little loose. So, I checked all the set screws to see if I could properly losk the arbor to the shaft.

What I have to show now may be at least part of my problem. I found three of these in my arbors (not the conical on the right). Which one is correct?

6012

[dusty]

I posted the following info once before. Maybe I should have paid more attention to it myself.

http://icrank.com/cgi-bin/pageman/pageout.cgi?path=/data/screw/setscrew/setscrew_source.htm&t=2