Tumbler Build - For cleaning plasma cut parts.

Would it be as simple as wiring a Contactor in between the motor and VFD? And controlling the contactor with the VFD relay output? I am thinking I still need a way to stop the power in case the VFD malfunctions.

NO. I would not connect any switch between the VFD and the motor. Check the manual it usually states that.

You could issue a stop command to the VFD and put a contactor on the mains side of the VFD

Hi
Also do not disrupt power from vfd. If motor is turning you have a good chance to kill the vfd by back-emv. If you feel (i think this a good idea anyhow) that you want to have mains removed from vfd do it via a time delayed relais.
m5c
Mike

Thanks for the advice guys.

I will draw up a wiring diagram in the next couple days and you guys might have a look at it and let me know.

Tom, I am with you on the Timer,


Thinking maybe tie it to one of the digital inputs.

I want to be able to control the rotation speed of the drum. I would think smaller parts could be done at a faster speed than larger parts. Not sure until I do some testing.

Before it is put into service, I will make a safety cage around it with doors that when open the motor will not be able to operate.

All adds a bit of complexity. I will get there though!

Added the chain temporarily. The taper lock on the shaft is going to need a keyway cut into the shaft.

@ MachineDude: Any advice on cutting a keyway into the shaft already welded to the drum?

things would have been a lot easier if the key way was done before the shaft was attached to the drum. now that it is welded to the drum you need a really big machine to cut the key way the way you have things now. might be able to cut it on a Bridgeport style mill with the Y axis if you can use a fork truck to hold it up while you cut the key way and maybe a roller under the other end of the shaft once you get things straight and on center so it can move with the table. i would leave the forks there to catch it if something would slip. doing something like that is not the safest way to do things. the safest way would be to pull the shaft out if you can? i'm not sure what machines you have to work with either?

I was thinking a bit more agricultural than using a mill.

1mm cutting disc on a 5 inch grinder. Drill two holes either end the correct depth cut slot width underside and grind out center with 5 inch grinding disc. Then finish by had with a file.

Not fun but would be easier than taking the shaft out.

I am going to see if any of the local mining workshops around here have a machine to do onsite keyways. My guy who use to do a lot of on site line boring is not here today so I will ask on Monday.

another option would be something like this but they are not cheap if you would have to buy one. but you would probably get your money out of one if you run into this kind of thing often.