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How do you stop a pulley from turning?
At the end of each side of the U is a pin, and a pulley has a hole on either side of it’s main nut, so when you put this thing on the pulley, you can hold it to stop it turning while you loosed or tighten the main axle nut of the pulley.
How do you tighten a loose pulley?
Turn the adjustment bolt on the side, top or bottom of the pulley counterclockwise with the ratchet and socket until the accessory belt is loose enough to remove. Tighten the tensioner pulley by turning the adjustment bolt clockwise with the ratchet and socket until the belt is tight.
How do you get threads unstuck?
One is to hit on the head of the bolt in the center with a chisel or punch. Another is use an impact wrench/gun and hit it a few brief times in reverse and forward. Either of these methods work on the theory of freeing the corrosion bond between the threads by vibration or impact.
How do you loosen a screw?
Put some penetrating oil or WD-40 on the screw and let it sit for a while. Insert your screwdriver and tap it with your hammer. You want to break the screw free from the rust holding it in place and this may be enough to break the bond.
What is the holding power of a No0 screw?
If you choose No0 screw (1.524mm diameter), axial holding power is 50 lb (222N) so your holding torque is 444 Nmm. If you exceed this torque setscrew will fail but because of D shaft it will hold till material failure (on plastic shaft probably).
How are motor shafts coupled to lead screws?
Couplings are good at making sure your motor shaft fastens to the lead screw. Couplings are simply used to enable a motor to turn a lead screw, or other type of shaft. There are two types of couplings, rigid (one piece), and flexible (an assembly of pieces). Flexible couplings are composed of two hubs and a central spider.
How is the holding power of a setcrew determined?
Setscrews’ holding power is proportional to its diameter you can check Marks’ Standard Handbook for Mechanical Engineers, Eleventh Edition, Table 8.2.18. gives holding power for Cup-Point Setscrews. Maximum load you can get from a setscrew from that table is 7000lb axial holding power for 1 in setscrew.