The bolt that needs to be removed in order to put on a saw blade is on so tight that i cant get it loose. there is no blade on it right now. this problem is for a bosch 12" compound mitre saw. please help
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Re: putting on a saw blade
Well M8:) try to to unloose it backwards, It dosent loose as usal, you need to posh the otherway. Nornaly you loose things from right to left, this one (and other items that cut) you loos from left to right.
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First remove the battery, next make sure of the blade rotation and remove the hex bolt and OUTER flange lift the guard and put the blade on the spindle. Reinstall the outer flange and tighten the hex bolt, generally newer saws have a spindle lock to hold spindle to tighten the blade. If this is a Porter Cable like in the header you can go to dewaltservicenet.com and with your model and type number find an operators manual. Let me know if you need more assistance.
Be sure the saw is switched off and unplugged. Use the Makita socket wrench on the side of the saw base if you still have it. If not make sure you use a socket or wrench that fits the bolts properly so you get them off and back on without damaging them. Lock the handle in the up position with the stopper pin. Loosen the hex bolt holding the center cover in place, this will let you raise the guard and center cover so you can get at the blade bolt. There is a button on the back side of the blade guard that locks the spindle. Push and hold the button in and turn the blade until it locks in place. Using the socket wrench, turn the blade bolt clockwise or in the same direction the blade turns while cutting to remove it, the outer flange and blade. Put the new blade on (check that the direction of the arrow on the blade is the same as on the guard), the outer flange and blade bolt. Use the spindle lock to get the bolt on tight. Return the center cover to it's original position and tighten it's hex bolt. Turn the blade by hand to make sure the spindle lock released then pull the stopper pin and make sure the blade guard works properly.
From the description it sounds to me like the bolt holding the blade in place isn't tight enough, obviously. If there isn't a button on the saw that stops the blade from rotating when you're changing out the blade. Try this--when tightening down the blade, put it on the saw, then open the guard and rest the blade on a piece of scrap wood to stop if from moving. Then fully tighten down the bolt that holds the blade in place and you should be fine.
There should be a special washer between the bolt (that holds the blade on) and the blade. If the arbor has a flat side on it, then the washer should have a matching hole so that the washer cannot turn independently of the arbor. Or, some saws use a spring washer which is cupped and becomes flattened against the blade as the bolt is tightened. If you have the first type of washer, perhaps the bolt is just not tight enough. If you have the second type of washer, perhaps the washer is backwards. If you have neither type of washer, you need one.
Usually on portable saws there is a hole somewhere in the blade guard to put a screwdriver or something through and hold the blade still while you tighten the spindle nut etc. Hope this helps. I only have experience of a very old B&D saw which worked in this way. I now use a more modern Bosch machine which also works the same.
Their web site seems to be down at the moment but most circular saw you just need to lock the blade somehow. Sometimes putting the blade up against a piece of wood so it can't turn will get the job done. Unplug the saw so it can't run. Some saws come with a custom wrench to turn a custom bolt, others a regular combination wrench would work. There should be a bolt that goes into the center of the blade. To keep the bolt from coming out while cutting, they are reverse threaded so you loosen it by turning the bolt the reverse direction you on a normal bolt. take the bolt out and be careful you don't loose the washers on each side of the blade. Put in new blade and reverse the process of taking it apart.