Question about Bosch 12" Compound Miter Saw 3912

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Putting on a saw blade

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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Most of the miter saw the bolt should remove to left hand/left. I broke my because I did the opposite. Good luck

Posted on Aug 21, 2013

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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.


Good luck to you

Posted on Dec 18, 2008

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1 Answer

Changing the blades


You have to loosen & remove the bolt which holds the blade in place. Once that's done, slide the blade guard around so that you can lift the blade off of the collet and pull it out of the opening on the bottom of the saw. Put the new blade on in the reverse order and tighten the bolt back into place.

Dec 15, 2016 | Saws

1 Answer

Need to know how to get the blade off the miter saw to replace the blade


First, make sure it's unplugged.

On many saws the guard mechanism partially covers the bolt that holds the blade in place. Loosen and move the part out of the way as recommended by the manufacturer. On this saw you loosen a screw and then slide the mechanism up and towards the rear.

Press the spindle lock to lock the blade in place. Turn the bolt clockwise - opposite the normal direction - to loosen and remove it. Remove the outer blade washer and the blade. Leave the inner blade washer in place. Wipe a drop of oil on the surfaces of the blade washers that touch the blade.

Put the blade on the saw so that the teeth point down. Putting the blade on with the teeth facing in the other direction can result in serious injury. Put the outer blade washer in place. Turn the bolt counterclockwise until it is snug, plus another 1/8 to 1/4 turn. Replace the cover and you're finished.

Oct 27, 2011 | Saws

2 Answers

I bought a ls1016 coupond mitre saw this week. I was cutting cedar 2x6 's today and had a few kick backs. I am building my deck and do not feel safe using the saw after the kick backs. Why as this...


Sounds as if the blade is dull. Or perhaps bent. A dull or bent blade blade will 'grab' the wood, rather than cut it, resulting in binding, or kickbacks.

Solution; replace the blade with a fine-toothed, good quality blade. If the blade is new, then check that the blade is bolted tight on the arbor. If the blade is loose, it can result in kickbacks.

Also, check that all the bolts/fasteners/locking mechanisms on the saw are tight, and in good working order. Sometimes a tool new out-of-the-box will have loose screws/nuts/bolts that need to be tightened up.

Also, when cutting, use a smooth, slow, motion, being sure to give the saw the time it needs to make the cut.

Jun 19, 2011 | Makita LS1016LX 10inch DualSlide Miter Saw...

1 Answer

Blade keeps coming loose


Check to make sure the blade washers are installed correctly and the right order The thread is left handed on the bolt and should tend to tighten from the toqure of the motor spining If this dosn't you could try a drop of white lock tight on the threads of the bolt but don't use red locktight its to strong

Jan 30, 2011 | Ryobi ZRTS1342L Factory-Reconditioned 14...

2 Answers

How to tighten blade on super sawcat model 2154 , blade spins and I cant find any way to stop spindle from spinning when Im trying to tighten . Any help would be great as was my fathers saw and would still...


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.

Jun 04, 2010 | Saws

1 Answer

How do I install the blade on a bosch cs10 circular saw


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.

Dec 02, 2009 | Bosch Circular Saw Blade, 6 1/2"

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How do I remove the blade from a Makita MK470 tile saw? I can't figure out how to hold the saw blade so that I can turn the nut hodling it on. The nut is on pretty tight and I need to lock the blade so I...


There is not a lock on this saw. If the blade is to tight to hold by hand you need to use an impact wrench. It will loosen the nut before the blade has time to start spinning.

Nov 11, 2009 | Saws

2 Answers

Loose replacement blade


I completely removed the blade and put it back on, tightening the locknut, and now it works perfectly. The blade has not come loose and have used the machine for the last 3 months. The only thing I can think of is that somehow I didn't have the blade correctly installed in the first place, although it didn't wobble or anything.

Jan 25, 2009 | Ryobi ZRTS1342L Factory-Reconditioned 14...

5 Answers

Changing the saw blade on a Ryobi Mitre saw


There may be a push button type blade lock, and on many of these saws the retaining bolt for the blade is backwards threads, e.i., looking at the top of blade retaining bolt, turn it clockwise to loosen. This would normally tighten, but in the case of many of these saws, it loosens it.

Jan 04, 2009 | Ryobi ZRTS1342L Factory-Reconditioned 14...

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