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Old 12-31-2022, 03:36 PM
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Default Hoist

I figured out why my hoist got two blocked and ripped out my sprocket. The motor I used is faster than factory and the hook hits the paddle that is linked to the reversing drum switch to fast and the motor keeps right on going Any ideas how to fix it so it doesn't happen again?
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Old 12-31-2022, 04:15 PM
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Is there some way to move the paddle so the motor has more time to stop? Maybe even just a simple extension to stop things sooner?
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Old 12-31-2022, 05:47 PM
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Could you add a spring that starts to engage the lever, and adds some more time?


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Old 12-31-2022, 06:27 PM
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Could you add a spring that starts to engage the lever, and adds some more time?


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Maybe a spring on the paddle
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Old 12-31-2022, 06:56 PM
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In the picture of the hoist you posted. Is that some kind of Brake on the motor shaft? If so is it working? I looked through the original link and see you did put the brake back on there. Is the brake working?

Since the motor is faster I would go with the other folks and see if you can adjust the cut off to make it shut off sooner.

Scott
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Old 12-31-2022, 07:23 PM
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Originally Posted by Scotts View Post
In the picture of the hoist you posted. Is that some kind of Brake on the motor shaft? If so is it working? I looked through the original link and see you did put the brake back on there. Is the brake working?

Since the motor is faster I would go with the other folks and see if you can adjust the cut off to make it shut off sooner.

Scott
The brake works fine but if you switch a drum switch to fast motor direction doesn't change and the brake is already disengaged because the paddle is in the down position.
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Old 12-31-2022, 08:25 PM
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Originally Posted by digr View Post
The brake works fine but if you switch a drum switch to fast motor direction doesn't change and the brake is already disengaged because the paddle is in the down position.
I'm typing this out to get it in my head. Patience please.

The hoist is traveling in one direction, when it reaches the trip point it trips to go in the other direction instantly, so that even if you were to trip the paddle sooner you would still have the same issue. The paddle would trip then the signal picks up to change directions. and it just keeps motoring along in the same direction because you did not stop so it could start going in the other direction. Do I understand the situation correctly?

If so, you need a control to stop the motor when it reaches the trip point and not allow the other direction control to come on till you command it to. I am going to venture a guess that there are two contactors in the hoist connected to the rope control that would have been to control the 3 phase motor. I will go venturing some more and say the controls are just a remote version of you pushing on the contactors with your fingers to turn the hoist on and off. If so you may need to come up with some electrical controls for the single phase motor to combat this issue.

Am I close on this so far? If all this is close do you have a garage door or gate opener in the pile of opportunity?

I have been known to overthink stuff also. there may be an easier way I just don't see it from here yet.

Scott

Drum switch is the word that clears all this typing up above. You need a way for the works to stop until you give it a command manually to go in the other direction. I went back and reread your response above.
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Old 12-31-2022, 10:13 PM
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Maybe just a Hockey Puck between the blocks to absorb and slow shit down till the switch trips .
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Old 12-31-2022, 10:45 PM
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Originally Posted by Whitetrash View Post
Maybe just a Hockey Puck between the blocks to absorb and slow shit down till the switch trips .
The switch does trip but to fast so the motor doesn't change direction. If you flip a drum reversing switch fast enough the motor will not change direction.
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Old 12-31-2022, 10:48 PM
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Quote:
Originally Posted by Scotts View Post
I'm typing this out to get it in my head. Patience please.

The hoist is traveling in one direction, when it reaches the trip point it trips to go in the other direction instantly, so that even if you were to trip the paddle sooner you would still have the same issue. The paddle would trip then the signal picks up to change directions. and it just keeps motoring along in the same direction because you did not stop so it could start going in the other direction. Do I understand the situation correctly?

If so, you need a control to stop the motor when it reaches the trip point and not allow the other direction control to come on till you command it to. I am going to venture a guess that there are two contactors in the hoist connected to the rope control that would have been to control the 3 phase motor. I will go venturing some more and say the controls are just a remote version of you pushing on the contactors with your fingers to turn the hoist on and off. If so you may need to come up with some electrical controls for the single phase motor to combat this issue.

Am I close on this so far? If all this is close do you have a garage door or gate opener in the pile of opportunity?

I have been known to overthink stuff also. there may be an easier way I just don't see it from here yet.

Scott

Drum switch is the word that clears all this typing up above. You need a way for the works to stop until you give it a command manually to go in the other direction. I went back and reread your response above.
That is the ticket, especially for a single phase motor. Not a drum switch but similar. I can switch between forward and reverse on my Grizzly lathe and it will keep turning the same direction unless I bring it to a full stop.

A small(ish) coil spring just above the hook and below the puck to give it reaction time before the coil binds. Maybe some rework of the switch arm.
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Last edited by arizonian; 12-31-2022 at 10:58 PM.
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