Started by charles mann, September 16, 2023, 01:45:32 AM
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Quote from: booman on September 16, 2023, 09:36:08 AMI am curious as to what electric hoist you are using.
Quote from: booman on September 16, 2023, 10:09:23 AMYes, thanks.
Quote from: DanielW on September 18, 2023, 09:45:52 AMIf you go with an electric clutch, are you considering putting sheaves right on the crank output of the 4BT? I've seen a few circular mills where people have belted right to the crank of an old engine. It works, and for a few hours a week you'd probably be fine, but when people to that they're putting a pile of side-load into the rear main bearing, which wasn't really designed to take any. Better to couple it through some u-joints to a jackshaft with its own separate bearings.
Quote from: Joe Hillmann on October 11, 2023, 10:37:24 AMIf you are looking for a cheap clutch, you can build a simple one out of a rear differential from a truck.Depending on how you configure it it would give you about a 1:1.5 increase or reduction in speed.From the engine you would connect a drive shaft to the front U joint on the differential. Then one side of the diff is connected to the saw, the other side has the brakes left intact. To engage the clutch you lock up the brake. To disengage it you release the brake. That would give you 1/2 of the gear ratio decrease from engine speed.Or if you want a 1/2 of the diffs gear ratio increase you would put engine power in from where one of the wheels was and take power out at the U joint.It is also possible to get a 1:1 ratio but it requires putting power in at one wheel, taking it out at the other and putting a brake at the U joint. However the diff was probably never designed to spin that fast and would likely self destruct quickly.Maintenance on the clutch is a simple as replacing the brake shoes/pads and drum/rotor when needed which should be very easy to get at.Such clutches used to be very common before cheap hydraulics. If you want to see one in action search for homemade cable drilling rigs on you tube.
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