Author Topic: Single phase milling motor  (Read 4686 times)

Carpenter84

Re: Single phase milling motor
« Reply #15 on: June 06, 2019, 11:36:42 AM »
Would you call it a straight trade or should someone owe some a bit more?
Shawn

4GSR

Re: Single phase milling motor
« Reply #16 on: June 06, 2019, 01:09:47 PM »
See it he would throw in something else. A drill chuck, tool holder, endmills, drill bits, cast iron, steel, brass, aluminum, etc..  You never know until you ask.
Ken

Carpenter84

Re: Single phase milling motor
« Reply #17 on: June 06, 2019, 01:26:45 PM »
He says he has a clamping kit for the vise, but i haven't heard back yet.

Carpenter84

Re: Single phase milling motor
« Reply #18 on: June 15, 2019, 01:29:12 PM »
I have most of the parts I need for the motor swap. 2hp vfd just came (Amazon). I'll get some electrical components this week.
I roughed out the aluminum adapter plate. Need to clean it all up (jeez what a mess...) and drill some holes. I also got a new v-belt last week. I need to take the pulley housing off aaaaagain to install it. I'll take some pictures shortly. I actually have some shop time this afternoon for a small shop job.
« Last Edit: June 15, 2019, 01:59:44 PM by Carpenter84 »
Shawn

Carpenter84

Re: Single phase milling motor
« Reply #19 on: June 15, 2019, 02:47:38 PM »
Bingo bongo

Carpenter84

Re: Single phase milling motor
« Reply #20 on: June 16, 2019, 08:09:00 AM »
And we're running.
Motor has quite a bit of phase vibration when running anything lower than 60 Hz. There might be settings I can play with. Not sure.
But it is also reverberating through my bench. It might be fine on the mill.
Shawn

woodchucker

Re: Single phase milling motor
« Reply #21 on: June 16, 2019, 03:12:23 PM »
And we're running.
Motor has quite a bit of phase vibration when running anything lower than 60 Hz. There might be settings I can play with. Not sure.
But it is also reverberating through my bench. It might be fine on the mill.


Not likely, if it vibrates on the bench it will vibrate on the mill.
find the problem before you mount it.

Jeff
Clausing 8520   SB Model 9a - power hacksaw, Milwaukee band saw in a table.  Delta Rockwell Surface Grinder
For pics: https://imgur.com/user/woodchucker/posts

Remember measure once cut twice, or was the measure twice cut once...

Carpenter84

Re: Single phase milling motor
« Reply #22 on: June 16, 2019, 05:34:47 PM »
It's an electromagnetic vibration, not a shaft or bearing. Almost as if the start capacitor didn't disengage on a single phase motor... But not as explosively terrible, like a start capacitor not disengaging on a single phase motor...

I'll double check that the motor windings are wired properly. I checked once and everything seemed fine, maybe I missed a lead. The print ok the wires is hard to read.

But, failing that. Could there be a setting I should focus on in the VFD? Im pretty sure I have the name plate info entered correctly, again, I'll double check.

I'll try to post a video later of it. Maybe someone with more experience with vfd's can chime in.
Shawn

4GSR

Re: Single phase milling motor
« Reply #23 on: June 16, 2019, 06:07:55 PM »
If that is a nine wire motor, check to make sure you don't have 6 and 9 switched or 1 and 7 switched. It's easily done. I've done that and the motor ran slowly not near full RPM and vibrated.  It could damage the VFD if not careful here. 
Ken

Carpenter84

Re: Single phase milling motor
« Reply #24 on: June 16, 2019, 08:10:32 PM »
Definitely not that.
I think it's just 3 phase motor noise. My lathe motor does the whining sound as well when I'm cycling through the speeds. I put the motor on the mill table and it wasn't nearly as loud.
I took a video.

bench
mill table

Not sure if the camera captured the vibration difference. It was definitely reverberating through my wooden bench. Not the quietest motor, sounds like my other 3 phase VFD motor, maybe a tad louder. Only quieter I've heard is a 3ph motor with a VFD, but actually on 3 phase power. Conveyer motors, when I worked in factory. However, it was also astronomically louder there, period. So, could just be drowned out.
Shawn

4GSR

Re: Single phase milling motor
« Reply #25 on: June 17, 2019, 08:39:06 AM »
Replace the motor bearings.

Other than that, I think the rest of the noise is inherent to the motor.
Ken

Carpenter84

Re: Single phase milling motor
« Reply #26 on: June 17, 2019, 12:59:12 PM »
You hear bearing noise? I didn't think the bearings felt/sounded bad. But, for what they're worth, I could do it anyways.
Shawn

4GSR

Re: Single phase milling motor
« Reply #27 on: June 17, 2019, 08:56:49 PM »
You hear bearing noise? I didn't think the bearings felt/sounded bad. But, for what they're worth, I could do it anyways.

A bearing can feel good just turning the shaft.  When brought up to speed, it can have a grow to it as I heard in your video.  The bearings are probably okay for now, but will eventually will get worse to the point causing havoc to the motor. 
Cheap insurance if you ask me.  Try to get a good bearing brand like RBC or NSK.  I wouldn't dare use any of them cheap Chinese bearings. For motor bearings, look for sealed bearings and a C1 or C2 grade bearing. 
Ken

Carpenter84

Re: Single phase milling motor
« Reply #28 on: June 17, 2019, 10:15:17 PM »
I only order bearings from wholesale now. They donít sell Chinese anything. Most I get now are nsk unless I ask for better. Which I havenít yet. Lol

Carpenter84

Re: Single phase milling motor
« Reply #29 on: June 22, 2019, 12:58:52 AM »
Made a bunch of progress on the 3 phase motor change tonight. Motor has new bearings, adapter plate is complete, motor is mounted, VFD is wired and tested, remote will just be speed and direction control, main power switch will be on the enclosure on the wall.
I'm keeping everything very simple this time. I'm short some electrical components, but I can run the mill quite nicely from the vfd display panel.
New pulley belt on the motor, new bearings in the pulley too. When I took the pulley head off, I cleaned out between the back gear cogs. Doing so made the pulley drop lower than before, I had to modify the way it sat as mentioned below. In doing so, I wound up with a really gnarly cog noise at lower speeds. Almost like it was grinding. That strange new noise I had mentioned.
I took the power head back off (to replace the belt) and put a bunch of high tack grease between the cogs in an attempt to quiet them. Sorta worked for a few mins, but the big difference was just loosening the belt tension. Maybe it didn't like the side load. I don't know. The belt tension is pretty low now, but a couple face mill cuts made me decide the tension may be fine.
The whole mill runs quite a bit quieter now.
I also noticed since I cleaned the cogs, that interrupted cut banging might be gone. But I have to do more testing.

There's still more to button up and tidy up, but I'm feeling good about the swap. I'm also going to be putting an rpm display on, I'll need to. But I need to think about where the sensor needs to go...
« Last Edit: June 22, 2019, 01:01:28 AM by Carpenter84 »
Shawn