I need a 5/8" shaft balanced.

Postby **nervewrecker** » October 18th, 2020, 8:34 pm

Where can I get this done tomorrow? If need be the entire assembly.

Shaft maybe about 6 to 7 inches long.

Rotor about 2.5" wide by about 1.5" tall.

Seems the hardest thing to get is a straight motor shaft out here.

:/

Numb3r4 · Postby **Numb3r4** » October 18th, 2020, 8:41 pm

A machine shop????

GULF ENG./GOPCO???

Postby **nervewrecker** » October 18th, 2020, 9:37 pm

Thats the thing, I not sure where to start.

need it done like asap as this particular unit has no parts. There is a defect in the motors they have in stock, all were pulled from the shelf.

Using a motor from a bigger unit for the same output / rotating capabilities. Thing is whatever little flaws wont show in the unit it is designed for. The system i putting it in is bigger in size and has larger panels so it amplifies vibration.

goviboo · Postby **goviboo** » October 19th, 2020, 4:22 am

D Rampersad for rotating equipment

Numb3r4 · Postby **Numb3r4** » October 19th, 2020, 7:41 pm

If its motors we're talking about you could consider talking to folks who do motor windings and such they might have the ability to help.

Postby **nervewrecker** » October 19th, 2020, 7:57 pm

Shaft bent, two brand new motors and shaft bent.

Had a machine shop check it.

I donno what going on in this place nah.

Having a new shaft machined tomorrow.

Numb3r4 · Postby **Numb3r4** » October 19th, 2020, 8:20 pm

Manufacturer's defect, rejected products or poor shipping and handling?

A run of bad luck???

Good luck with the machining.

Fireflyrain7 · Postby **Fireflyrain7** » October 19th, 2020, 8:33 pm

Check mustaphas engineering in chaguanas

Postby **nervewrecker** » October 19th, 2020, 8:48 pm

Numb3r4 wrote:Manufacturer's defect, rejected products or poor shipping and handling?

A run of bad luck???

Good luck with the machining.

We can only hope its this.

As most does ask "how come you alone does have these issues? is either you just bad lucky or a lot goes unnoticed in equipment that leaves our place".

When things like this take place it costs time and money. People have to do followups, damage control and recalls. Some are actually grateful and nip the problem in the bud alerting suppliers of the issue and pulling the merchandise off the shelves.

Case in point, a brand new motor was defective, this is the 4th motor I on. The first one was noisy, second caught fire, third and fourth from (another supplier, another motor) have bent shafts. The first two, that specific model you will not get brand new anymore. They have all been pulled from the shelves from various suppliers until further notice.

This one of the main reason I rarely buy new stuff, I yank out older stuff and give people or use it for rebuild. The rare motors that remain and seized I keep them with new bearings on standby. Bearing pullers are used and bearings installed properly. What I find also strange is that a new bearing was also defective, it has a lot of play on it. Shafts are frozen and bearings left in the sun for install. Shafts cleaned and polished for install.

phreakazoid · Postby **phreakazoid** » October 19th, 2020, 9:50 pm

Is it an electrical motor you speak of? Can you share more details?

Frame size
HP
Phases
Voltage
Speed
Bearing type- sealed or grease?
Pictures?

There can be many reasons for your multiple failures such as inadequate greasing, over greasing, imbalance, soft leg, lack of a proper monitoring etc. More info is needed for a proper analysis though.

Ted_v2 · Postby **Ted_v2** » October 19th, 2020, 9:56 pm

sounding like the man for the job^

This nearly get pelt away this twice last night.

Postby **nervewrecker** » October 19th, 2020, 10:38 pm

Will update tomorrow.

Gunna try and sleep.

Yea Jed, nearly pelt away. Lucky this is for one of my biggest client in the private sector or else I would have fling it away.

Numb3r4 · Postby **Numb3r4** » October 20th, 2020, 1:39 am

Agreed some pics would be cool.

Also the act that they have been pulled from shelves until further notice could point to a defect with a batch.

Are all your product coming from one supplier?

Postby **nervewrecker** » October 20th, 2020, 6:49 pm

Like all the motors have something wrong.

I tested a brand new one today.

Same issue.

We replacing the whole damn unit yes. Fed up, past fed up and past the point of trying anymore.

sMASH · Postby **sMASH** » October 20th, 2020, 6:58 pm

if u gt with a machine shop that can solve the issue, pass on the info.

Postby **nervewrecker** » October 20th, 2020, 7:40 pm

sMASH wrote:if u gt with a machine shop that can solve the issue, pass on the info.

The owner said pelt away the motor and whole ac unit. Bring a new one.

Was looking for a shaft but men not willing to part with anything anymore.

Right now parts scarce, men holding stuff for themselves.

Atlantic air not selling units to 3rd party installers. They holding their stock for themselves. Shelves clean in other places.

Two of the motors I keep on standby are hard to find, direct drop in replacements. Got a call today about 3 units down and they have power to them. Last time I went had a motor and fan in one that does not belong there. Its a smaller frame but higher power output and rpm they swap in. It couldn't fit so the blade was locked on the grill. I reported it and they didn't kick a fuss, its like an upgrade not theft. Added some spacers on the grill and left. It was the one nearest to the fence. I willing to bet all 3 motors gone this time.

Postby **nervewrecker** » October 20th, 2020, 9:24 pm

first motor, original motor

Postby **nervewrecker** » October 20th, 2020, 9:31 pm

second motor

Postby **nervewrecker** » October 20th, 2020, 11:01 pm

When we run it on the lathe, we saw that it bent.

Both bent.

How, why?

As they said, sheit happens. It's not uncommon to see such.

Tested a new one today, straight off the shelf and it had noise. Posted it in the group and my peers abroad says that's not how they work. Something is wrong. One raised the issue that maybe it needs load, one was run with load and made a lot of noise.

They all got good voltage, current, right size cap etc and we're tested at more than one places.

Tested one for a short period and it got very hot. No poling issues. Ted and I put toothpaste on the rotor and spin it inside the stator. No rubbing. Even tried balancing the rotor, no success.

What odd is one bearing have play on it and it was just installed. Bearing removed with a bearing puller. New bearing actually fit a little loose hence the piece of foil on the shaft to hold it in place a bit. Bearings not installed bent as well. All that checked out, it's about 3 pairs of bearings I pass through. All brand new skf from United bearings. Still can't be any cause of any of the above issues.

The second set of motors are not meant for the system I trying to fit them in. Noise will be neglible on the system they designed for. It's very compact with a lot of bracing. The system I trying to fit it in has huge panels and a lot of empty space. Imagine your cellphone vibrating on a solid concrete kitchen counter and same phone vibrating on a large hollow wooden counter or even in an office desk drawer.

This much effort is being put in because this is my biggest client and the owner of said company bedroom unit. It's priority to me.

Unfortunately he said replace the entire unit and fix this one for use elsewhere on one of the compound. Very understanding client and very humble person.

Driven · Postby **Driven** » October 20th, 2020, 11:34 pm

This one of the main reason I rarely buy new stuff, I yank out older stuff and give people or use it for rebuild. The rare motors that remain and seized I keep them with new bearings on standby. Bearing pullers are used and bearings installed properly. What I find also strange is that a new bearing was also defective, it has a lot of play on it. Shafts are frozen and bearings left in the sun for install. Shafts cleaned and polished for install.

What odd is one bearing have play on it and it was just installed. Bearing removed with a bearing puller. New bearing actually fit a little loose hence the piece of foil on the shaft to hold it in place a bit. Bearings not installed bent as well. All that checked out, it's about 3 pairs of bearings I pass through. All brand new skf from United bearings. Still can't be any cause of any of the above issues.

On the shaft or within the housing? Are you using the right bearing?

Excessive clearance on either the shaft or housing can lead to increased temperatures as the inner/outer race is allowed to spin, causing friction and increasing temperatures.
How did the grease in the bearings of failed units look following removal? spongy? in that case it's likely the oil was separated and the grease was no longer able to lubricate properly.

Using a motor from a bigger unit for the same output / rotating capabilities. Thing is whatever little flaws wont show in the unit it is designed for. The system i putting it in is bigger in size and has larger panels so it amplifies vibration.

The second set of motors are not meant for the system I trying to fit them in. Noise will be neglible on the system they designed for. It's very compact with a lot of bracing. The system I trying to fit it in has huge panels and a lot of empty space. Imagine your cellphone vibrating on a solid concrete kitchen counter and same phone vibrating on a large hollow wooden counter or even in an office desk drawer.

If I'm understanding this right - you're using a smaller motor for a larger application? Does the mounting allow for proper alignment of motor and the driven equipment? What kind of noise are you hearing? screeching or a periodic knocking?

If the bending and 'play' on the bearing are all on the drive end of the motor, I'm inclined to think it's an issue with alignment or the bearing selection

phreakazoid · Postby **phreakazoid** » October 22nd, 2020, 3:11 am

Given the information provided, I would say you have to get the "shaft to bearing inner race" and the "bearing outer race to end covers" fits within manufacturer's tolerance (might be around 0.001" interference fit but verify with motor specs.). Shafts and end covers tend to wear in service and sometimes require build up but given the size of motor, not worth the effort.

Ensure that you do not hammer the new bearing in when installing as this will damage the bearings.

Tip- Spin the bearings by hand to determine if they sound smooth or if they sound like they have gavel inside (defective). Additionally, any noticeable play would mean the bearing is defective.

Bearings that have been sitting on shelves for lengthy periods can gather moisture and corrode and may be a possible reason for your multiple failures.

I gather that the shaft has a fan blade attached to the end? Is the fan balanced?

Have you tried ProCom for new motors? They have a good line of WEG motors.

Postby **nervewrecker** » October 22nd, 2020, 9:21 pm

A lot of support in here.

It's a bigger motor I was putting in. Blower wheel balanced, been in service for a number of years.

I never hammered in a bearing....ok, I lie, did it twice as a last resort.

The entire shaft seemed to be bent, was wobbling on a drill and on the lathe.

I am of the impression the new bearing I put in may be bad. Didn't make a fuss over it because it's my job to pick up on these things and I am 100% sure if I took it back to the place they would have replaced it.

Informed the company today about the motor and they said it not supposed to hum. The matter was taken seriously and I know for a fact they will be looking into it.

Regretfully this may probably be my last job. I am tired and frustrated beyond what anyone can imagine. Literally on the verge of loosing my mind. Workers are the worst and if I continue like this it's either I go insane or I end up with a bad reputation for poor service. The last month more I spent doing damage control from stuff men screw up.

I will continue to provide some sort of support for my customers until I help them get a replacement tech to service them and I will get another job elsewhere (if anyone hiring nah lol).

Thanks for the support everyone.

Numb3r4 · Postby **Numb3r4** » October 23rd, 2020, 6:29 pm

Stay safe and hang in there.

Don't give up on your business.

Deep breaths.....

Yeah well workers....you'd think with the way things are they'd be in a higher gear performance wise, but everyone right now is under a lot of stress I guess.

Postby **nervewrecker** » October 23rd, 2020, 11:22 pm

I actually considered hanging up the hat, still contemplating it because workers driving me nuts.

Something may happen soon.

Everything that could have gone wrong just about went wrong today. Swallowed my pride and prepped my ears for a tongue lashing from one of the most powerful person in the private sector.

Instead I saw what power is, what respect is and how far a good reputation can take you. Saw a bit of me in there, saw room for my improvement and saw reason to carry on.

Thanks for all the calls everyone.