My job is not cutting in perfect 90 degree. Means cutting is tapper. How to solve this problem.

4 corners? Each corner is 90 degrees. Divide by 2 for the cut on each piece for 45 degrees.

cylinder head 1st 75NM 2nd 150NM 3RD 90 degree turn
tapper rocker cold 0.15 mm / hot 0.25mm .

Did you check to see if the saw has a locking nut on the front of the bevel gauge handle? Its possible you just locked it into position and forgot to unlock.

some saws don't set up when select 90 degrees , unplug saw then take a small square like a combo square , place it against the side of the blade and flat down on the bed of the saw adjust to the square regardless what the setting shows take a fine black marker and put a small dot on the indicator that is on the saw then you know where your true 90 is and always use the dot . should do it even some expensive saws are not perfect i always check the all before cutting if havent used saw before

tan(x/2)=sin(x)/(1+cos(x))
Setting x/2=45, means that x=90 (degrees)
But cos(90)=0 and sin(90)=1. Thus tan(45)=1/(1+0)=1.

If you haven't done so yet check the base plate bevel adjustment setting to make sure it is setting at a 90 degree angle to blade and make sure that the shank on the blade is not bent or twisted. Hope this helps. Thank you.

Adjust the angle by turning the bed of the saw bit by bit until you have a 90 degree cut on a piece of timber measured with a carpenters square. Some saws have an adjustable pointer and you can now adjust it to point to 90 degrees. If the bevel cut is off, the vertical downwards cut, there may be grub screw at the back of the saw which will allow you to make adjustments.

If the house is actually cooling, but the thermostat thinks in 90 degrees in there, you definitely need a new thermostat. If the house is actually 90 degrees, the AC SHOULD cycle on and stay on till it reaches the preset temperature. Since it doesn't make sense that you would complain about the AC cycling on at 90 degrees, I can only conclude that you have a faulty thermostat.

They make pipe benders for you application. They are quite inexpensive. If you want to do it your self you can. Remember the total number of degrees you want is 90. Each cut is half the angle. Example 45+45=90. 30+30+30=90. and so forth.

I don't know your application but they sell larger radias 90 degree rigid conduit elbows at Home Depot or Lowes.

Inside the saw, on the end of the trunnion is a stop that is adjustable to zero the saw in to exactly 90 degrees. Either there is sawdust or something accumulated there or it needs to be adjusted. You say you cleaned it out, So you'll need to unplug it an have a look up in there. See how there's a geared piece of steel that moves when you crank the saw over to 45 degrees. Usually there's a bolt or stud with a locking nut on it, either on the trunnion itself or the lower surface of the table top. You need to break the nut loose and screw the bolt in or out to adjust, then crank the saw over to hit it, check for square with a known square, crank it all the way out of the way and readjust, etc. Until you get it right. Make sure to tighten that lock nut when you're done.

I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread. If I've managed to answer your question or solve a problem, please take a moment to kindly rate this post....thanks!