Juki dl8700. What causes it to smoke while sawing?

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Short circuit power to earth.

it would be a good idea since the machine made a banging noise & was smoking
to have it check to see why that happened to avoid any future damage to the machine

MAYBE YOUR SAW HAS NOT ENOUGH POWER OR THE BLADE IS BAD.

I don't think that it is only dirt. It could be the switch or possibly another electrical part causing the smoke. How does the saw run?? Can you look into the vents of the handle area and see it arcing excessively when running with no load, if so you have an electrical issue that would need to be fixed, Let me know if I can be of more assistance.

Hello, I hate when this happens to my tools. This could be a number of issues. I would think that the transistor that controls the motor speed is shot or the motor itself is loading the transistor causing the smoke, or the brushes internally of the motor are worn and causing the overheating, hence smoke. Is the unit new or well used?
Joe

Unless the bar is dragging on the clutch I don't see how it can cause the clutch to smoke. Please let me know what Echo says.
TIA Lou

Could be electrical problem, (brushes burnt, armature grounded or bearings starting to seize up) I don't think that I would use it till the problem is fixed. Could cause or create more expensive repair. Let me know and I will try and help

Couple things I would look for first the condition of the blade do you see any buildup around the teeth like something has burnt on it. Also look into the area around the blade under the table (unplug saw first) to make sure that something hasn't dropped into it rubbing blade causing smoke. Also turn the blade by hand to make sure turning freely. The smoke could possibly be coming from a bearing. If it less than a year old Bosch has a pretty good warranty and you might look into that also. Let me know and I will dig deeper into it.

the clattering sound was probably a stone or something that was being bounced around by the rotating bush. It jammed which caused the belt to slip and cause the smoke you saw. You can probably get away with finding and clearing the jam but I would inspect the belt just to make sure.