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People have been reporting issues with raising and lowering the blade on their Ridgid R4520 table saw.
In this video, you will see inside views of the table and the areas of concern as described below
It turns out there is a common cause for this difficulty among most who have reported the issue either directly to me or on various forums.
The most common culprit seems to be the riving knife bolt that attaches the arm holding the riving knife that goes through the trunion and tends to get caught or stuck which in turn puts pressure on the lower arm bolt and the steel plate that holds that bolt in place.
When enough pressure is applied it will bend or wreck the lower arm plate attached to the trunnion.
Some people on the Facebook Ridgid R4512/R4520 Table Saw Owners Club Group have suggested switching out that upper arms bolt with a longer one and adding a spring to allow that bolt to move more freely.
I don't recommend that type of change.
The bolt on my saw is loose enough that I can turn it/move it freehand but still tight enough to hold the riving knife snug against the trunion to keep the riving knife stable when cutting wood.
Having that bolt too loose or spring-loaded may cause the arm to sway, in turn, let the riving knife move while you're cutting.
The best suggestion I can make after using this saw for almost a year is to clean out those grooves where the bolts slide on a regular basis and make sure there are no metal burrs or nicks in the trunion slot. Those can be removed with some sandpaper. Use a dry lube (affiliate link below) to keep everything slide freely.
**Remember to follow all safety precautions provided by the manufacturer anytime you are working on your table saw or any other power tools.
Thanks
Paul
DustyWorkbench.com
#woodworking, #Dustyworkbench, #Ridgid