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you may have tap the saw to move tilt.
The cuttinghead of your compound miter saw can be
tilted to cut any bevel angle from a 90 degree straight
cut off to a 45 degree left bevel angle. Loosen bevel lock
handle (A) Fig. 19, tilt cutting arm (B) to the desired
angle, and tighten lock handle (A) Delta MS250 Instruction Manual Adjusting Pointer Locking Cuttinghead In...
check for slide wear on the mounts
if it has any it allows the motor and saw to drop sideways and alter the cut angle
you can compensate by moving the setting that bit extra and the locking it up
the slide can be angled by the degree plate where the timber sits
the blade can be angled by the degree plate on the arm that mounts the saw
so you can get a 45 degree to the timber length and a 45 degree angle cut to that angle to give you a corner mitre cut
normally they do
they cut at angles across the material
there is also a adjustment at the back of the slide that allows the head to be tilted
there is an angle gauge there and a pointer to give you the tilt angle
by adjusting that and the across the bed angle , you can cut compound angles
set the angle and then test cut as the angle may not always be exact ( setting it on 10 degrees on the scale may be 10 1/2
degrees in reality so testing gets it dead right)
adjust as necessary
using a set square , The angle if 45 degrees is machined into the handle draw a line at 45 degrees across the surface you wish to mitre cut
clamp a piece of timber along that line and use it as a guide to cut with the circular saw
Few budget tools and especially generic, brand engineered tools imported from the far east are superbly accurate but tend to be "near enough".
You didn't say whether it is a hand operated mitre saw or a power saw.
Most power mitre saws have a number of stops that can be adjusted or filed in order to calibrate the angles and this process should be done when the saw arrives. Once both 45 degree angles have been calibrated accurately the angles in between should fall into place fairly well.
One problem with low cost mitre (chop) saws, even some so-called professional saws is the construction is so light, when pulling down the handle the machine flexes and spoils the cut. This is especially true when the handle is not set exactly in line with the blade or when not paying full attention when making a cut.
Having experienced such saws I have learned much about them so when I visit a tool store I examine their stock by twisting, rocking and pulling the saw heads and the amount of movement in many new saws of popular brands is disgusting, even some pretending to be premium brands. So far only a few of the most expensive types have impressed me.
That doesn't mean the others are unusable and with care fairly accurate cuts can be made when a suitable technique has been developed - like using a rifle with bent sights...
There probably is a way to correct the angle - my Delta model 36-220 10" Compound Miter saw has (2) Allen head cap screws (with washers and split washers) attaching the saw to the revolving table, and, if loosened (and retightened) could fix a small deviation from the perfect angles.
But, the reason I'm posting an answer to your question is that Sears does not guarantee power tools - just hand tools, so consider returning the offending tool to Sears (rule: always keep your original packaging until the return period ends). The reason to consider returning the tool is that once the return period expires, you either fix the tool yourself, or interact with the manufacturer under its warranty. When (or if) you return the TerraTek Saw, grab an aluminum speed square or a large carperter's square from Sears shelf of carpentry hand tools, and test the replacement saw's 90 & 45-degree angles.
The bevel is an angle fiding tool. it consists of a wooden section about 4" long with a swivel bolt at one end connected to a slotted metal blade (similar to a 1 foot steel ruler). The bolt has a wing nut and bolt to allow loosenig to allow the blade to rotate and slide to the required angle where it is locked into position using the wing nut.
The mitre is a wooden block with slots cut into it at pre determined angles. ie 45 degrees. When cutting a mitre joint the wood is placed against the block and the saw follows the line of the slot cutting the 45 degree angle.
Hope this makes sense and good luck
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