How Do I Get My Blade To 90*?

D

darita

Member
Joined
Jan 23, 2007
Messages
462
So I have a TSC55 KEB that I'm attempting to adjust the blade 90* to the table.  I'm just shy of 90*, however when I screw the stop screw CCW, all it does is lift.  I've tried flipping the 1* lever, but it still won't go down any further.  What am I missing?
AFGVGDt.jpg


RadX3GN.jpg
 
I'm confused by the first photo. What is going on there?

My first reaction to this type of question is simple. Are the cuts you make with the saw out of square?
If they are, you are focusing on a non-issue.
 
Before I use any saw, I go thru it and adjust everything as accurately as I can.  From that point on I know my cuts will be accurate and any aberrations in cuts are my error.
 
What does a quality machinist square (or even a quality non-machinist square) say when you use it to measure for 90?

I don't know that I would take the 89.875 degrees from that particular readout as the gospel truth.  It sounds like an estimate at best.
 
darita said:
Before I use any saw, I go thru it and adjust everything as accurately as I can.  From that point on I know my cuts will be accurate and any aberrations in cuts are my error.
Click to expand...

My point is that you might be adjusting it away from square. The actual cut is what matters.
 
For that angle reader to accurately measure if your blade is square, you need to be certain that what ever the saw base is sitting on is at 0 degrees - which is next to impossible. So, you need to flip the reader onto the table top, zero it out, then flip it onto the saw blade.
But I agree with the above - do a rudimentary check with a square, then more importantly, check a piece you have cut.
 
Like others have said, make a cut and check the cut with an accurate square.

I did look at the Jingyan claims of accuracy & resolution and at first glance they are very extremely impressive.
Accuracy +/- .005º
Resolution .001º

However right underneath those specs they mention
Angle resolution: 0.1°
Angle accuracy: 0.5°

So I'm just curious what's real, especially for the $175 price tag. It'd be interesting to send it in for certification and find out where it lands.  [smile]
 
I assume you’re all correct, however I still want to know how it can be adjusted, assuming the meter is correct?
 
Following on… I’d put the cover back on the saw and make a cut and then test the cut for 90*.

This is a general procedure. I don’t have knowledge of that particular saw.

To make that test cut I’d find something thick, flat, and relatively soft, like two pieces of mdf laminated.
The workpiece should be secured to a stable bench or similar and the guide rail should be a shorter one and clamped to the work.

Unless the resulting cut is perfect you want as much of the testing apparatus to remain fixed (as a constant) as possible.

Of course you’ll have to remove the guide rail to test the cut. Put the thick handle of the engineer’s square against the cut edge. You can use feeler gauge to measure how much the blade is above the work and if you’re smarter than me you can use a calculator to figure out how much you need to change the angle of the saw.

Now you can apply the digital inclinometer to the saw. Make sure the saw is stable on a flat surface so the reading is steady. You don’t need to use the magnets just use a lightweight clamp to secure it to the blade housing. Doesn’t matter what the angle reads except that you want to reference that reading to adjust the saw the right amount according to the feeler gauge and calculator.

I’ve used two different digital inclinometers and they are can be deceptive. They aren’t as accurate or as reliable (repeatable) as the decimal places would lead you to believe. Some of them also a slower refresh rate meaning you can move the saw substantially before the readout changes. Not good. When it really counts I use a long stick clamped to the saw, as below.

When I really needed accurate angles I did use the digital device as a starting point and then used a 2 foot stick clamped to the housing to make very fine adjustments. Used a vernier protractor to test the cut angle then used cad to figure out how far to move the stick.

 
Well interestingly enough this is from the Festool TSC 55 KEB manual.

Both positions (0° and 45°) are set at the factory and can be readjusted by the cus­tomer service team.

 
[member=44099]Cheese[/member] where did you see the lower specs? I only see this “High accuracy ± 0.005 ° and 0.001 ° high resolution” at jingyan-tech.Com  If that thing is really that awesome I could forget about the stick.

I think the lower spec is for “gyro measurement”, when the instrument is spinning at “
 
Here's some dude doing exactly what you're doing on the internet


You need to spin it clockwise so it'll push the blade to 90. Because your reference edge is the edge stuck to the blade you're looking at the supplementary angle of the bevel angle marked on the saw. You turn it ccw if you want to lessen the angle. I probably wouldn't trust that angle gauge as far as I could throw it.

I'd cut a 1.5" piece of wood and check for square with whatever square I'm using to build things.

Good luck.

-r

darita said:
So I have a TSC55 KEB that I'm attempting to adjust the blade 90* to the table.  I'm just shy of 90*, however when I screw the stop screw CCW, all it does is lift.  I've tried flipping the 1* lever, but it still won't go down any further.  What am I missing?
AFGVGDt.jpg


RadX3GN.jpg
Click to expand...
 
Cheese said:
Like others have said, make a cut and check the cut with an accurate square.

I did look at the Jingyan claims of accuracy & resolution and at first glance they are very extremely impressive.
Accuracy +/- .005º
Resolution .001º

However right underneath those specs they mention
Angle resolution: 0.1°
Angle accuracy: 0.5°

So I'm just curious what's real, especially for the $175 price tag. It'd be interesting to send it in for certification and find out where it lands.  [smile]
Click to expand...

May be these are the actual parameters?
Angle resolution: 0.1°
Angle accuracy: 0.5°

My Beall inclinometer has this spec: "The display always reads left to right, even if inverted, and a "hold" button keeps the measurement for reference. It has a range of 90° left or right and a resolution of 0.05° (accurate to 0.2°)."

I use the Beall angle gauge to set the blade (SawStop or Kapex), and then verify the cuts made on scraps. The Beall device has been so consistent in its accuracy and performance that I now trust it as much as I trust any other reference measuring tools I have, such as the Starett Combo Square or the Australian CNC machined square.

89.875* is more than square for all woodworking intents and purposes.

 
ChuckS said:
May be these are the actual parameters?
Angle resolution: 0.1°
Angle accuracy: 0.5°

My Beall inclinometer has this spec: "The display always reads left to right, even if inverted, and a "hold" button keeps the measurement for reference. It has a range of 90° left or right and a resolution of 0.05° (accurate to 0.2°)."

I use the Beall angle gauge to set the blade (SawStop or Kapex), and then verify the cuts made on scraps. The Beall device has been so consistent in its accuracy and performance that I now trust it as much as I trust any other reference measuring tools I have, such as the Starett Combo Square or the Australian CNC machined square.

89.875* is more than square for all woodworking intents and purposes.
Click to expand...

I don't know Chuck...and I really wish I had an answer but I'm completely dumbfounded. I keep an eye on the latest SOTA (state of the art) measuring systems because that's a thing of interest to me. Vision systems have been an ongoing interest of mine for the last 5-6 years and they just keep getting better, cheaper and easier to use.

This particular item, if the specs are factual and if the repeatability is factual, is certainly a one of a kind tool. However, I have no information if either one of those assumptions are correct. That's the reason this would be a very interesting item to send into an accredited QA certification lab for certification/calibration such as Starrett or Hexagon.

In some ways this reminds me of the audio equipment spec wars of the 70's & 80's when certain brands of predominantly Asian audio equipment would loudly proclaim that they produced 200 watts of power, but when subjected to strenuous testing under controlled conditions by McIntosh and Crown test labs...the amplifiers produced less than 20 watts of power.  [crying] [crying] [crying]

I'm hoping this is not the case, but I'm not very encouraged.  [crying] [crying]
 
I’d like to get confirmation of the Jingyan TLL-90S specs too. If it as fine as the website says it could replace the vernier protractor, which is only good to two decimal places.

Darita could put the instrument on the work surface and on the bevel and get the bevel angle directly. I do DO NOT trust my Wixey or Beale boxes enough to do that.
 
Michael Kellough said:
I’d like to get confirmation of the Jingyan TLL-90S specs too. If it as fine as the website says it could replace the vernier protractor, which is only good to two decimal places.

Darita could put the instrument on the work surface and on the bevel and get the bevel angle directly. I do trust my Wixey or Beale boxes enough to do that.
Click to expand...

Here's about the best I can do...it's a bit finicky on zeroing out...and the magnet is weak.

NJZXhIy.jpg


96bbYT6.jpg
 
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