Hi guys & gals,
I saw that Northern Tool has this mobile base on sale this weekend and wondered if anyone has used it and can vouch for it's value or lack thereof. I realize there may be better ones out there, but for $29 bucks, I can't build one for less using HF casters and plywood. My...
I just wanted to let everyone know that I have uploaded a new tutorial entitled "Brush Maintenance and Inspection for Universal Motors." This tutorial is compiled from posts by Bob Vaughan and myself in response to Buster's original request for assistance in the thread titled "Porter Cable Belt...
Universal Motor Brush from Ryobi 1/4-sheet palm sander. This closeup shows the compete brush assembly -- carbon brush, brass housing/assembly and quick connect power cable. Not visible, a spring mechanism inside assembly allowing the brush to travel outward as it wears.
Universal Motor Brush from a Ryobi 1/4-sheet palm sander. This is a closeup of the brush assembly (top brass housing), carbon brush (middle, charcoal grey), and commutator (lower copper strips) mate.
Universal Motor Brush from a Ryobi 1/4-sheet palm sander. This is a closeup of the carbon brush. Notice the curvature and smooth face where it mates with the motor commutator.
Universal Motor Brush from a Ryobi 1/4-sheet palm sander. This shows the complete commutator and brush assembly. The brush assemblies can be seen left and right side enclosed in the brass housings (with red wire attached via quick connects).
Universal Motor Brush Holder from a PC 690 Router. This is where the brush (with spring assembly) is inserted into the brush assembly. Not shown is the brush service cap that screws into place to lock everything in place.
Universal Motor Brush from PC 690 Router. This closeup shows the carbon brush (barely shown in center), brush assembly (left) and motor commutator (right).
Universal Motor Brush from PC 690 Router. Another view, again notice the curvature of the brush where it mates with the commutator (left side). Also shown is the spring and the braided conductor wire.