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

The guard is stuck on the blade. How to get it off? It may have been put on the wrong way.


That's very unusual--do you have the right size blade on the saw---It might help if you removed the blade holding bolt so as to alow the blade float. Other then that I need more info cause what your saying to me is not possible from my point of veiw--unless the guard came loose

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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.

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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

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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

2 Answers

Can you tell me what is causing my delta mitre saw motor to run but the blade does not spin powerful enough to cut moulding?


Maybe the bolt which holds the blade on is loose. If the motor is on the RIGHT side of the blade, then the bolt has 'left-hand' thread. Turn it counter-clockwise to tighten.

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1 Answer

12'' Ryobi miter saw with loose blade


You may need to use lock tight on the threads. Also replace the standard washer with a lock washer if possible.

Mar 12, 2009 | Saws

1 Answer

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.

Good luck. :)

Mar 11, 2009 | Hand Tools

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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Trouble removing blade


The bolt is counter clock wise (standard thread), use a screw driver to jam the blade

Nov 28, 2008 | Saws

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