Bosch gcm 80 js blade released by itself
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School / College
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I'm using this mitter saw. After the blade released by itself I connected it back but then it started to make weird noises and after few seconds released again. does someone know what it might be? I put the blade on a flat surface and it seems straight.
thanks
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Joinery installation in the broadest sense
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Hello netaiha1
This sounds pretty unusual.
The GCM 8/80/800 mitre saws are all designed to work with a blade with a 30mm bore (diametre of the hole in the centre). The first thing that springs to mind is that the blade on your saw perhaps has a smaller bore and so is not seating properly on the inner disc (the piece on the mortor side of the blade). The inner disc has a raised 30mm center section that you seat the blade onto. If you're using a blade with a smaller bore, although it will fit over the shaft, won't seat on the inner disc, causing miss-allignment, which in term would cause vibration and ultimately the blade coming loose.
My second thought is you should double check you are using the flange. This is the piece you put onto the non-motor side of the blade before screwing in the bolt. If the flange is missing, it's possible the bolt is unable screw adequately into the shaft for a secure fixing. Again, this would cause vibration, odd sounds and blade release.
If the above are all as should be then check the bolt threads are ok, not worn, stripped or flattened. If they are, replace it. Also check that the hex/allen head of the bolt is not worn/rounded. When you insert the bolt to tighten, make sure you do so using the spindle lock so that you can apply adequate tightening torque to the bolt. The spindle lock is a button on the motor housing near the blade guard.
If any of the above are missing or you feel need replacing, replacements are available at PowerToolSpares.