Here is a step-by-step guide on how to use a Starrett protractor: 1. Place the protractor on the surface that you want to measure. 2. Align the zero mark on the protractor with one of the marks on the surface. 3. Use the other hand to hold the protractor in place. 4. Use your thumb and index finger to read the angle on the protractor.
Full Answer
How to install protractor and start it?
Install Protractor
- You can install all the packages from the VS code itself.
- Open VSCode and click View -> Integrated Terminal
- Navigate to the folder in which you want to install the protractor if you are going to a local installation.
- Install the Protractor using below command for global installation npm install protractor -g OR npm i protractor -g
How do you calculate angles without using a protractor?
Method 1 of 2: Calculating Interior Angles in a Polygon
- Count the number of sides in the polygon. In order to calculate the interior angles of a polygon, you need to first determine how many sides the polygon has.
- Find the total measure of all of the interior angles in the polygon. ...
- Divide the total measure of all of a regular polygon's angles by the number of its angles. ...
How to draw an angle using a protractor?
Line up the bottom of the protractor with the diameter so that the midpoint of the protractor aligns with the center of the circle. Use the protractor to draw any central angle up to 180°, using another diameter (or radius) to complete the angle.
How to measure a reflex angle using a protractor?
- In step 1, you have to identify the smaller acute angle connected with the reflex angle.
- Now, draw a vertical line connecting the rays of the acute angle.
- Next, measure the rise and the run of the acute angle.
- Divide rise by a run to find the slope of the acute angle.
- Open the calculator and find the degrees of the acute angle.
Vernier Protractors
The vernier protractor is one of the most valuable and useful tools for the kit of every good toolmaker, inspector or machinist
Bevel Protractors
The bevel protractor has revolving turrets with direct reading double graduations a full 0 to 180° in opposite directions, permitting direct reading of angles above or below the blade.
Miter Protractors
The 5-in-1 combination protractor performs miter cuts, single cuts, compound cut conversion table, protractor and roof pitches.
Steel Protractors
The steel protractor is a highly useful and accurate tool for setting bevels, transferring angles, small squaring tasks, checking cutter clearances within certain limits, and many other applications.
Where to place the origin of the protractor?
Place the origin of the protractor at one end of the line. This point will be your angle's vertex. Mark the paper where the vertex is placed.
What is a protractor?
A protractor is a handy tool used to measure and draw angles. Generally, semi-circular in shape, protractors are also available in full-circle, 360-degree versions. If one look at the object has you completely confused, never fear; learning to use the tool is simple.
How to use a protractor to measure angles?
To measure angles with a protractor, first place the center point along the bottom edge of the protractor over the vertex of the angle you're measuring. Line up the bottom edge of the protractor with one leg of the angle.
How to draw an angle with a ruler?
Using a ruler, the flat edge of your protractor or another straight edge, connect the vertex with the marked degree, drawing the second leg. This second leg completes your angle. To verify you’ve drawn the angle accurately, use the protractor to measure it.
How to align an angle with a baseline?
Rotate the protractor to align one leg of the angle with the baseline. Maintain the vertex of the angle in the origin and gently rotate the protractor so that one of the legs of the angle falls on the baseline of the protractor.
How to measure the origin of an angle?
2. Place the origin over the center point , or vertex, of the angle you want to measure. The small hole in the middle of the base of the protractor is the origin. Align the vertex of the angle with the center of the cross in the origin. ...
What to do if the line does not pass through the protractor?
If the line does not pass through the protractor’s arc, extend the angle's line until it does. Alternatively, you can align the edge of a piece of paper with the angle’s leg to pass beyond the edge of the protractor, continuing the line of the angle.
What is the Starrett protractor?
But the Starrett protractor is a very-easy-to-use tool. It has two scales: The red miter cut arrow and outer scale are for cutting miter joints; the black “Single Cut” arrow and inner scale are for cutting a single angle. At first, the tool might be a little confusing, but once you get the hang of it, you’ll love it.
How to use a Starrett?
Using the Starrett is simple. To measure an inside angle, open the unit like a boomerang, place it in the corner you wish to measure, and spread both sides until they make contact with the wall. The device holds a measurement pretty well.
What is the angle of the red miter cut arrow?
The Single Cut arrow is pointing at 45°. The red Miter Cut arrow is pointing at 22 1/2°. Those are the actual angles on your miter saw. There’s no thinking or math involved. Of course, if you want to know what the real angle is, you can turn the Starrett 5-and-1 Tool upside down and read the “protractor” angles.
How does the Starrett scale work?
The easiest way to explain how it works is to set the Starrett for a 135° angle ( the same angle in “Miter Angles and Miter Saws” ). Most of us look at that angle and think it’s a 45°, but, really, that’s just the Single Cut. Look closer at the Starrett scale and you’ll see what I mean. The Single Cut arrow is pointing at 45°. The red Miter Cut arrow is pointing at 22 1/2°. Those are the actual angles on your miter saw. There’s no thinking or math involved.
What is the angle between 0 and 0 on a miter saw?
Your miter saw is referenced against the fence. So the angle between the fence and the 0 position is actually 90 degrees. This is why you can use a speed square to make sure 0 on your gauge is perfectly 90 degrees as the blade comes down.
How to cut an angle with a chopsaw?
Trace this angle onto a board or edge of your chopsaw table. Take a scribe or compass and draw an arc from the angle’s vertex (point of origin) This will be at the very edge of the board — the arc can be small or large, whatever is comfortable as long as it crosses the angle line you’ve drawn and cuts the edge of the board or table too. Move the point of your scribe to this intersection where the arc cuts the angle. Draw a small quick circle that looks to be more than half the angle–take a guess. Now move your compass, without changing the setting, to the other arc intersection (this one is at the edge of the board or table where your first arc leaves or crosses) and draw another circle the same size. The two circles will overlap in two spots that represent the exact bisection of your angle. You can connect them if you like — I simply reset my sliding t-bevel to cross these points, lock it, and then use it to set my miter right on the saw in front of me. This sounds complicated, but in reality takes about fifteen seconds, and is absolutely accurate (and won’t set you back $100). Look ma, no numbers.
How to read the outer scale of a miter?
Remember, if you’re cutting miters, you’ll want to read the outer scale with the red Miter arrow. That gauge gives you the angle to cut BOTH pieces so that you have a perfect miter. If the corner is out of square, the gauge will give you the correct miter for your miter saw.
What is a protractor tool?
Measure angles and dimensions with one tool. Protractor has graduations from 0° to 180° in both directions. Also known as a bevel protractor, it has an adjustable arm. The arm is narrow to fit into holes for use as a depth gauge. It has a corrosion-resistant satin-chrome finish that reduces glare and wear-resistant etched markings.
What is a bevel protractors?
Also known as bevel protractors, set bevels and measure angles with the adjustable arm. All have graduations from 0° to 180° in both directions. They have a corrosion-resistant satin-chrome finish that reduces glare and wear-resistant etched markings.
