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Table saw issue?

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Forum topic by Bill214 posted 02-21-2018 03:21 PM 527 views 0 times favorited 17 replies Add to Favorites Watch
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Bill214

5 posts in 292 days


02-21-2018 03:21 PM

I’ll try to make this simple cause I’m totally confused. I have on of those little digital angle finder boxes when i zero it to the table saw top the blade read 90 degrees on on side and a degree off on the otherside. Is this an issue or am I being crazy?


17 replies so far

View splintergroup's profile

splintergroup

2421 posts in 1419 days


#1 posted 02-21-2018 03:40 PM

I’m guessing the blade insert is what the angle box rests on when you take the measurement (at least on one side)?

If this is the case, could be the insert is not very flat. Retract the blade and lay a straight edge across the insert looking for any gaps.

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Bill214

5 posts in 292 days


#2 posted 02-21-2018 03:44 PM

I actually had the box on the table itself figured that would give me the best reading

View bigblockyeti's profile

bigblockyeti

5285 posts in 1918 days


#3 posted 02-21-2018 03:48 PM

The table itself would give you the best reading taking the insert out of the equation. Maybe you got a bad one, have you confirmed accuracy with a known square intersection?

-- "Lack of effort will result in failure with amazing predictability" - Me

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Bill214

5 posts in 292 days


#4 posted 02-21-2018 03:51 PM

I know the blade is parallel to the fence I’m just not sure is it’s cutting square now

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jimintx

855 posts in 1782 days


#5 posted 02-21-2018 03:58 PM

I find the question a bit confusing, to be honest about it.

I use a magnetic Wixey digital angle gauge, and i place it on the blade, not on the table. Square the blade to the table using an accurate square. Place the magnetic device on the blade and zero it. Tilt the blade until I see the desired angle on the readout.
In my case, that is almost 100% looking for a 45 deg angle.
For that 45 deg angle, and because I am old school trained, I then check the blade with a 45 deg drafting triangle anyway.

if you just think about basic geometry, saying the blade is different on one side vs the other suggest one of two things must be true, and maybe both. The blade itself is not true in some way, or the table itself is “bent” a tiny bit, right at the blade line. Neither of these makes a lot of sense to me … I guess I just can’t visualize it.

-- Jim, Houston, TX

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RobS888

2512 posts in 2042 days


#6 posted 02-21-2018 04:01 PM

Is it consistently the same value if you rotate the blade?

-- I always suspected many gun nuts were afraid of something, just never thought popcorn was on the list.

View Bill214's profile

Bill214

5 posts in 292 days


#7 posted 02-21-2018 04:02 PM

So what I do is zero the box to the table so I’m at zero then I checked the other table on the other side of the blade and it reads zero then I stuck the box to the left side of the blade and it reads zero (meaning it’s at 90 degrees to the table) then on the right side of the blade it reads .6 so I know that side is not at 90 degrees. I just don’t know how that’s possible

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jimintx

855 posts in 1782 days


#8 posted 02-21-2018 04:15 PM

OK I get that.

Try turning the box when you move it so that the same side of the box is pointed up when it is on both sides of the blade. Does that change the outcome? I wonder if the box itself is a little out of square.

Otherwise, I have to say that i have never thought to check both side of the blade. Now I will have to do that soon.

-- Jim, Houston, TX

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MrRon

5190 posts in 3441 days


#9 posted 02-21-2018 04:28 PM

Don’t forget the Wixey is accurate only to 0.1°.

View Loren's profile

Loren

10477 posts in 3845 days


#10 posted 02-21-2018 04:35 PM


I wonder if the box itself is a little out of square.

- jimintx

Seems likely.

Table saws often have dips in the tops as well. It’s
usually not enough to cause problems cutting wood
accurately. Some higher end saws are surface ground
with more attention to stress relief. Like wood, iron
moves when material is removed.

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SouthpawCA

272 posts in 3430 days


#11 posted 02-21-2018 04:43 PM

You are not crazy! I’ve taken readings from the table top (not the insert) and then on the blade and it read 90º … then on the other side of the blade it read something else. Turning the box parallel to the table helps, but still got different readings. I have both the Wixey and the IGaging (which I like better because it gave consistent readings … measure twice cut once) so it isn’t that. I’ve cleaned the blade surface and made sure the teeth are not in contact. Still different results. I then cut a piece of wood about 2” thick from the side that read 90º … checked the cut for square and it was right on. Checked the other side couldn’t see a difference, but the blade of the square didn’t rub across the length of the wood as much as the 90º side when I wiggled it. I figure 90% of the time I cut from the one side so I live with it.

-- Don

View Quikenuff's profile

Quikenuff

66 posts in 1066 days


#12 posted 02-21-2018 05:07 PM

Some saw blades have a very slight taper. Thicker in the middle getting thinner out to the teeth.

Quik

View Bill214's profile

Bill214

5 posts in 292 days


#13 posted 02-21-2018 05:11 PM

Yesterday was just a weird day in the shop

View Lazyman's profile

Lazyman

2608 posts in 1585 days


#14 posted 02-21-2018 05:32 PM


So what I do is zero the box to the table so I m at zero then I checked the other table on the other side of the blade and it reads zero then I stuck the box to the left side of the blade and it reads zero (meaning it s at 90 degrees to the table) then on the right side of the blade it reads .6 so I know that side is not at 90 degrees. I just don t know how that s possible

- Bill214

Okay wait. You said that you zero the angle finder on the the table and then put it on the blade and it is still reads zero? It sounds like you are using it wrong. When attached to the blade, it should read 90. Maybe that’s not what you meant? You put the magnets on the table with the display facing you, zero it and then tilt the unit and put the magnets on the blade with the display still facing you (Edit: towards the front of the saw).

-- Nathan, TX -- Hire the lazy man. He may not do as much work but that's because he will find a better way.

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WhyMe

1072 posts in 1758 days


#15 posted 02-21-2018 06:38 PM

If you are trying to hand hold the digital angle finder to the blade and not using the magnetic side will cause a flux in the reading. You need to use it as Lazyman suggest.

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