rigid miter saw problem

[ernie 34]

i have a rigid 12" miter saw ms 12501 model.i bought it used.from what i was told it's about 3 yrs old.what it does is on initial start up it vibrates until it gets up to speed then it runs fine plenty of cutting power etc.but it's annoying because it will cause your piece to move while this happens.the brushes look fine.the brake seems to work somewhat in consistent in the time it comes on.i'd take it to a repair center but i'm afraid the cost would be prohibitive.i asked a rigid salesman he said it might be the switch or the brushes??.another fellow at a repair center told me it was most likely the bearings??.if you turn the blade arbor by hand it seems smooth and free.of course that's not under a load??.any help would be appreciated thanks ernie.

[cmoorejack]

Hey ernie 34,
Vibration is most likely a mechanical problem...first make notice of the vibration with and without the blade..sometimes it is as simple as a blade out of balance or bent..you may have some end play with the spindle..minor gear wear or a gear that has moved on the spindle...and of course.. a bearing ready to go out..[spindle bearing and possibly an armature bearing.. a good repair shop should be able to remedy fairly economical..
if you wish to troubleshoot and repair on your own..parts available at ereplacementparts.com...
Hope this helps..
Craig

[ernie 34]

Hey ernie 34,
Vibration is most likely a mechanical problem...first make notice of the vibration with and without the blade..sometimes it is as simple as a blade out of balance or bent..you may have some end play with the spindle..minor gear wear or a gear that has moved on the spindle...and of course.. a bearing ready to go out..[spindle bearing and possibly an armature bearing.. a good repair shop should be able to remedy fairly economical..
if you wish to troubleshoot and repair on your own..parts available at ereplacementparts.com...
Hope this helps..
Craig

thanks craig.i took it apart the arbor bearings and armature appear smooth and no play i can feel??.it does work ok without the blade but then there's no load on it right.around here they want 75.00-100.00 to diagnose it plus parts and labor.for that price i guess i'll live with it.

[cmoorejack]

Hey Ernie,
ouch.. sorry to hear that..
Did you eliminate the possibility of it being the blade..? if you eyeball the blade as it is winding down and it wobbles ..it could be the blade..the back blade washer could be worn or grooved causing a excessive run out....[try a new blade if possible..borrowed?]
and cheese whiz ....what ever happened to free estimates..?
Craig

[ernie 34]

Hey Ernie,
ouch.. sorry to hear that..
Did you eliminate the possibility of it being the blade..? if you eyeball the blade as it is winding down and it wobbles ..it could be the blade..the back blade washer could be worn or grooved causing a excessive run out....[try a new blade if possible..borrowed?]
and cheese whiz ....what ever happened to free estimates..?
Craig

no it does this even before you reach the table.when you initially pull the trigger it does it for a quick second just enough to make your board move.tried a different blade same thing.i don't expect a free estimate but it's just more than i want to spend.before it's over the price could get up to the price of a new saw.thanks.