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Re: need to change saw blade, lost instructions
1st, !!UNPLUG the saw!! Wear gloves to prevent nicks from contact with the saw blades.
If this is a handheld 'skill-saw' type saw, use a piece of wood to chock the saw blade from turning as you use a proper size socket/wrench to loosen the bolt which holds the blade.
The bolt will loosen counter-clock wise. It will probably be very tight, and you will have to use some effort to loosen it.
Remove the bolt, lift the follow guard and remove the blade.
Replace the blade with a like size diameter blade by raising the follow guard, inserting the blade, replacing the bolt, using a piece of wood to keep the blade from rotating and TIGHTEN the bolt. You will almost feel as if you need three hands to accomplish this procedure but its been done millions of successful times.
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Its conversely sometimes possible if you was asking about a wood saw with a steel saw blade but i cannot advice that in both application its not safe because not only of the difference of power but most it is the much higher RPM by diameter, just beware always on the max rpm you can read on your saw blades!!, it can give strange accidents with objects it can grab and swinging outbroken parts away.
Best thing to do is to just rest the blade teeth against a peice of scrap wood, and use the allen key/spanner to undo the bolt. As the bolt undoes in the direction of the cut, the blade teeth should dig in and stop it turning. If the blade lock isn't working anymore, it could mean that it has broken inside, so be careful, incase there is a bit of loose metal in the gearbox, it will be quite catastrophic if it gets caught in the gears.
You can download manual on bandsawmanuals.com or try to search on google , make sure to key in the model number of your bandsaw. You can also follow instructions from this article. How Do You Change Band Saw Blade
It is possible to replace the balde on your scroll saw when it gets dull. Make sure that you do change the blade to be very careful because the new one will be very sharp. Following the instructions on this site will help you out. http://www.doityourself.com/stry/how-to-change-a-scroll-saw-blade#b
What is your bandsaw? I have metal and wood cutting band saw. I just follow the procedures in the manual. I am using different Haltbar saw blades,well, actually it would depend on what stock I'm gonna cut. Try reading this blog : http://bandsawblog.com/replacing-the-band-saw-blade-on-your-band-saw/ . Hope that helps.
There is an 8mm bolt on the front of the guard. Loosen/remove this and the central guard mount will drop slightly. Behind the metal guard is a slide lock for the blade spindle. Push the lock bar and turn the blade untill it catches and is held solid. Then remove the blade fixing bolt and bobs your uncle. Alternativly, with all mitre saws, you can just pop an old bit of wood on the work base and then use the spannrer/allen key supplied to turn the blade so it bites into the wood as if you are trying to cut it. This will hold the blade steady and you will also be turning the bolt in the right direction.
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.
The extra brushes would likely be for the motor, and not used until the saw has LOTS of miles on it.
The allen usually backs off a clamp that holds the blade. In terms of metal and wood, the blade itself determines that. HOWEVER, Consider using and possibly distroying a WOOD blade. If there is metal in the wall, you usually do NOT want to cut that...!! I suggest cutting the drywall side first and see that there is nothing in the wall that you do not want to cut!!
The metal blade can cut wood, no worries.
High Speed Steel - Used for wood and light metal cutting
Bi-Metal - Also used for wood and light metal cutting.
Cobalt Steel - Tougher and lasts longer than Speed steel and Bi-Metal. Used for wood and metal.
Carbide Grit - Strictly used to cut masonry board.
Scrolling - Thinner than the regular jig saw blades and are used for tight turning cuts.