My wattmetter only shows the voltage

[Deleted member 4366]

You need a hexagon key to screw it out. Also called an allen key.

 

[cwah]

Thanks d8veh.

You're a late Owl. Already 1:45 and still not sleeping? Are you also on strike?

I'll try again tomorrow otherwise I'll never wake up tomorrow (and I'm not on strike lol)

 

[Deleted member 4366]

I'm a part-time schoolteacheer, so I would be on strike, but I don't work work Wednesdays. My Problem now is that I'm going to get docked a days pay for a day that I wouldn't be working anyway. I've got to try and sort that out now. I'm normally asleep by about 12:30, but I've had a bit of a bug recently that makes me very sleepy, so I've been nodding off a lot during the day, and them I'm awake at night time.
Let's hope that the screw comes out easily. You need a set of allen keys for your bike anyway and they don't cost much, but don't get the cheapes ones. Try and get medium price because the cheap ones can be soft and damage your screws.

 

[Scottyf]

//Queue Banter

I thought all teachers are part time anyway...

 

[flecc]

I've had a bit of a bug recently that makes me very sleepy, so I've been nodding off a lot during the day, and them I'm awake at night time.

Me too, so you have my sympathies for I know how irritating and frustrating that can be, especially the night time phase.

 

[cwah]

Me too!

Just felt asleep when I came back from work. And then now I'm awake but still feeling tired

I asked the scooter seller, he told me the screws are only used to fix the shaft to the cover. So I'll have anyway to remove from the other side.

Gonna buy a drill, make drill the screws in the sprocket to remove them. Then drill a metal bar. aaaahhh seems long and complicated

 

[Deleted member 4366]

That's right, so after you've undone the the screw, you'll be able to slide the cover off the shaft, which is what you want!

 

[cwah]

Ok will try that then.

I suppose I still have to buy a drill to fix the metal bar?

Going to get these as advised previously:
NEW 500W 240V ELECTRIC POWER TOOL HAMMER DRILL 3 YR WAR | eBay
2 x 4.0MM COBALT DRILL BITS 4MM DRILLS TOP QUALITY | eBay
HSS Tap Set M6 x 1 6mm | eBay
DRILL PRESS STAND FOR ROTARY / MULTITOOL & COLLAR HAND DRILLS 43mm & 38mm | eBay

Is it ok? Can I order from ebay now? thx

 

[oigoi]

Hi cwah

the tools you need to order will depend on the size of the bolt you are trying to remove. The damaged bolt on the sprocket will need to be drilled out and the hole in the sprocket repaired by putting a tap through it, but the size drill and tap that you need to buy depends upon the size of the damaged bolt.

With your vernier caliper measure the diameter of the damaged bolt in the sprocket. It will be either 6mm, 5mm or 4mm.

The size drill you use to remove the damaged bolt will then be as follows:

for a m6 (6mm) bolt use a 5mm drill bit. 2 x 5.0MM COBALT DRILL BITS 5MM DRILLS TOP QUALITY | eBay

then use a m6 tap to repair the thread M6 X 1.0 HAND THREAD TAP (TAPER) | eBay


for a m5 (5mm) bolt use a 4.2mm drill bit Black & Decker Cobalt 4.2mm Metal Drill Bit x50207 | eBay

then use an m5 tap to repair the thread M5 X 0.8 HAND THREAD TAP (TAPER) | eBay

for a m4 (4mm) bolt use a 3.3mm drill bit ALPEN Cobalt Jobber Drill Split-point 3.3mm mm 3.3 Qty 1 Drill Bits | eBay

then use an 4m tap to repair the thread HSS M4 METRIC HAND TAP - 4MM X 0.7MM | eBay

Also you do not need to buy the drill press stand in my opinion but it depends how good you are at using a drill.

You will need to be careful to drill exactly in the centre of the damaged bolt.

 

[Deleted member 4366]

I'd get the end off first (the other end to the sprocket). Once you've done that it should be possible to see what the problem is. You probably won't have to remove the sprocket. So, just buy an allen key set and remove that little grub screw.

 

[cwah]

Guys, I think I found what's the problem...

The rotor touches 1 side of the cover, making the screech:

> you can see no light go through

On other sides of the motor, you can see a thin space in which light go through

I suppose the only thing I can do now is to change the motor??

 

[oigoi]

Hi cwah,
to me that confirms what I was suspecting, that a bearing is gone inside the motor, causing the rotor to go out of alignment. You have two choices my friend, dismantle the motor and repair it, or buy a new one. Its up to you, depends how confident you are feeling about dismantling it and repairing it. If you are not confident that you can fix it you are better off buying a new motor, otherwise you might spend money on tools and still have a broken motor. I would not want to advise you to buy tools and it all be a waste of your money, so it is your choice I do not know how much you are an engineer! whatever you choose I wish you the best of luck your scooter looks like a cool project and a lot of fun

 

[cwah]

Hi Oigi and D3v3h,

I tried to remove the top cover with a big part of these screws:

The only one that almost goes inside is this one:

> I don't know why but there are mini piece of metal surrounding it when I tried to turn the screw.

I didn't manage to remove it, my set of allens key doesn't fit the hole or it's maybe not removable. D3v3h, if you have any idea how I can remove this screw, that would be very helpful.


I also check the size of the screw:

So I suppose I have to buy the 4mm drill bit?
ALPEN Cobalt Jobber Drill Split-point 3.3mm mm 3.3 Qty 1 Drill Bits | eBay

And maybe buy a 3.5mm screw?
25 OF ELECTRICAL PLUG SOCKET SCREW NP 3.5MM X 40MM 13C3 | eBay

I don't have any engineer skill, but I think it's never late to learn and the tool I'm going to purchase can still be useful later. So let's try to fix it, and probably buy another motor if that doesn't work


Thanks guys.

 

[Scottyf]

The metal around it us usually bits of the screw you tried to unscrew. Alot of tools are slightly magnetised to help locate and hold the bits your trying to turn.

As soon as you see these fillings its usually a good sign the screw is fecked.

 

[Deleted member 4366]

The measurement of 3.53mm is the size of the screw head. The size of the thread will be smaller - either 3mm or 2.5mm. To drill it out, you need to centre-punch right in the middle before attempting to drill otherwise the drill will walk off centre. Next, you need to start with a smaller drill of about 1.5 to 2mm just to get it started. You have to be really steady because the drill will break easily, and if it breaks off in the hole, you're out of the game. If you can make a hole a couple of mm deep, then you can change to the bigger drill. I'd start with a 2.5mm one. Again, it's really easy to break the drill, especially when it comes out the other side of the screw and jumps a bit. Don't push too hard.

Regarding the allen screw on the other end: It's only a question of finding the right sized key. I suspect that your screwdriver damaged the end a bit so that the right sized key doesn't go in so easily. Use the screw that you already removed to test for a nice snug fit on a key. When you're happy that you got the right sized key, then see if it goes in the other screw. If it doesn't, you can tap it in with a hammer. If it does, but spins, then you've rounded the hexagon inside. You might still be able to get it out with one of those star-shaped bits. You use the one that nearly goes in and give it a tap with the hammer. It should then be nice and tight and should be able to turn the screw out.

 

[Deleted member 4366]

Just another thought. The gap/no gap that you showed in the previous photos seems to indicate that the outer shell is running off-centre.
I still think that the most likely cause is a bent shaft. Perhaps somebody trod on it. I've heard of magnets coming loose, so that's also a possibility - that the magnet has come away from the shell and is rubbing on the rotor. If the shaft is bent, you should be able to see it by looking at how the outer shell moves relative to the end plate with the sprocket: You'd see it moving slightly from side to side as it goes round like a buckled wheel. If it's running true, then it's either a magnet or bearing. If it doesn't run true, then you can forget about repairing the motor. I guess you could get a new shaft, but not worth it for the hassle.

 

[oigoi]

In my experience the screw head on the grubscrew these sprockets is usually the same size as the thread itself - a 2.5mm or 3mm thread would be too puny to work as a sprocket grubscrew in my opinion. i think that damaged grubscrew is an m4 thread so would need to be drilled out to 3.3mm.

To err on the side of caution you could start drilling the screw out with smaller drill bits as dv8eh suggests, but 1.5mm and 2mm bits do break very easily and then you might be stuck with a snapped drill bit in the screw you are trying to remove. Personally I would start with a 2.5 or 3mm drill bit and see how it goes

I agree with the possibility of a bent shaft being a potential cause of the misalignment though.

 

[cwah]

Hello guys, I'm back. I was extremely busy this week so I didn't have time to pursue my investigation. But now I want to fix it!!

I just used the pen test to see if it's true:
[video=youtube;58Cq8ylfM7Q]http://www.youtube.com/watch?v=58Cq8ylfM7Q&feature=youtu.be[/video]
[video=youtube;sNXbjepM4D0]http://www.youtube.com/watch?v=sNXbjepM4D0[/video]

It's running true!! So the shaft is fine?


Can I say it's now time to drill?

 

[Deleted member 4366]

I keep trying to help you but you're not listening. The main cover is attached to the end-plate at the opposite end to the sprocket, so you need to remove the grub screw in that end first, which should be easy if you follow what I said before. Once you've removed that screw, the whole body will slide off and you should be able to see what's wrong.

If you drill and remove the screw in the sprocket, you'll only be able to remove the endplate, so it still won't be easy to check why it's touching, and you may damage something. It's possible that a bearing has gone, so you might be able to check for that, but there's also several other possibilities like: loose magnets, foreign object sucked in; bubbled glue/varnish, so you need to get the cover off.

In your second video you've got the pencil in the wrong place. You need to hold the sprocket end end-plate ant put your pencil on the black cover. If you could take a video looking at the sprocket end in the direction of the shaft, we will be able to see if the shaft is bent without the pencil

 

[cwah]

You're right, I didn't go too far with this difficult screw. It's because this one seem really difficult to remove. I tried to use a star key and tap it with a hammer like you said. But I think it reached the end and touches the metal:

Tomorrow I'm going to try a bigger key and see if it could fit better. It's too late now for hammering.

I also took a video of the sprocket in the direction of the shaft:
[video=youtube;1VS01C_YjfU]http://www.youtube.com/watch?v=1VS01C_YjfU&feature=youtu.be[/video]

I just holded it by hand, it's shaking a lot but it seems it's not bent? I can fix it again to the scooter for a better view if you have any doubt.

Thanks for your time and help D3veh, really appreciated.