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The saw starts but ramps up slowly. Under load the blade slows down. Seems as though the motor is not getting enough power or there is an issue with the motor itself. Any suggestions?
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You just do not have a saw that has enough power, the blade is dull or both. Change your blade and push the wood through slower or get a more powerful saw for the hard woods.
If your Bosch 3915 compound miter saw is making a grinding sound when it slows down, it could be an indication of a few different issues. Here are a few things you can try to fix the problem:
Clean the saw blade: A dirty saw blade can cause the saw to make a grinding sound. Use a brush or compressed air to remove any debris or sawdust from the blade.
Check the blade for damage: A damaged or worn blade can cause the saw to make a grinding sound. Check the blade for any chips or missing teeth, and replace the blade if necessary.
Check the bearings: The bearings on the saw's motor and blade can wear out over time, causing a grinding sound. Try to move the blade side to side to check for any play or looseness. If the bearings are worn, they will need to be replaced.
Check the motor brushes: The motor brushes on the saw can also wear out and cause a grinding sound. Check the brushes for wear and replace them if necessary.
Lubricate the saw: Lack of lubrication can cause the saw to make a grinding sound. Use a lubricant designed for power tools to lubricate the blade and other moving parts of the saw.
If none of these steps solve the problem, it's best to take your saw to a professional for repair. Grinding sounds can be an indication of serious issues, and it's important to address them before they cause further damage to your saw
It may be that the motor is under powered for the load, but more likely it sounds like the motor is defective. Perhaps some of the windings have shorted. That might allow the blade to spin, but stop under any load. What brand and model is this saw?
Hi, You did not say what fuel you running the motor on??? It sounds like it may be LPG or Propane.... is so then it seems as though you do not have enough surface for evaporation...
How would you rip 12 inches if your riping a 2x4 on a 45 secondly the blade of that saw and weather or not you were cutting through the grain on treated lumber. But if all that has been checked chances are one of the brushes on the motor need replacing. there are usually 2 black caps on both sides of motor that have replaceable brushes if one stops making good contact you get half power when cutting. You can check them and or replace if needed.
most probably it is bit of timber on the bottom of the saw assembly...
1. switch off the saw 2. remove power plug 3. remove screw and clear protector assembly 4. remove centre panel (as to changing the blade) 5. remove blade and clean dust furrow below it from all debris 6. re-assemble in reverse order 7. mount safety protector assembly 7, connect power cord 8. start in shor burst and switch immediatelly off, after blade stop spinning, check blade assembly if not wobbly.
this should solve your problem.
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Open the side cover and inspect the blade path and blade tension. Rotate the blade by hand looking for interference at any point. Make sure the drive pulley is not slipping on the shaft and that the belt is not loose or badly worn. Make sure the two large drums that carry the blade turn easily (dry bearing?). Does the motor slow down? Are the drum rim surfaces (rubber) in good shape? If the tension device is at limit, but not tightening the blade, the blade may be too long.
Your motor brushed sound like they're gone bad. Some electric motors have two small plugs on the side which house the brushes. See if yours has this and get new parts. The other possibility is that the bearings are corroded and has built up enough resistance to stop everything. Might not be able to replace those, however.
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