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Motor heating

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Re: Motor heating

Postby 9fingers » 05 Oct 2020, 13:37

The rotor wear is new information and so you might not need an electrical solution.

The question has to be how on earth the rotor can be rubbing to cause that. The bearing would have to be very badly worn to cause that or the motor end(s) have been fitted badly.

I should have been well within the capability of the motor shop to have solved that problem for you.

However I think they also told you of the centrifugal switch failure and that they could not fix that.
My electrical solution would solve the centrifugal switch issue - if it exists (?)
I've mentioned how to connect the switch. In series with the one of the capacitor leads.

Bob
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Re: Motor heating

Postby Phil » 05 Oct 2020, 13:49

9fingers wrote:The rotor wear is new information and so you might not need an electrical solution.

Bob


I phoned just to understand exactly what he told me, and I think I got it right.

9fingers wrote:
However I think they also told you of the centrifugal switch failure and that they could not fix that.
My electrical solution would solve the centrifugal switch issue - if it exists (?)
I've mentioned how to connect the switch. In series with the one of the capacitor leads.
Bob


:oops: I read but did not read, and then did not understand. (This is way outside my technical abilities and understanding! I can add 1 + 1 and give you an answer that will satisfy the tax people :lol: :lol: )


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Re: Motor heating

Postby Phil » 05 Oct 2020, 13:54

Question - with the rotor wear - new motor?

A new machine like this is GBP2,300 translates into about ZAR40k
:o :shock: :(
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Re: Motor heating

Postby 9fingers » 05 Oct 2020, 22:29

Phil wrote:Question - with the rotor wear - new motor?

A new machine like this is GBP2,300 translates into about ZAR40k
:o :shock: :(


Minimal importance just get it running true in the stator.

Bob
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Re: Motor heating

Postby Phil » 06 Oct 2020, 06:27

9fingers wrote:
Phil wrote:Question - with the rotor wear - new motor?

A new machine like this is GBP2,300 translates into about ZAR40k
:o :shock: :(


Minimal importance just get it running true in the stator.

Bob



This is way beyond my expertise or knowledge.
will take a drive to the repair place.
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Re: Motor heating

Postby Phil » 12 Oct 2020, 14:51

Ok, new motor purchased.


The new motor – with a few snags ……………………

The power connection sits on top – motor will not fit under the saw table


MotorPower-OnTop.jpg
(37.64 KiB)


Solution – move the mounting plates to another side swinging the electrics onto the side of the motor.
All the bolts are 5mm diameter.
Easy peasy!

There are no holes pre-drilled – so what now?

Dig out a metal case where the compressor fittings are.
Inside are also a range of taps and dies and luckily a 5mm tap with the right thread!

Having not used stuff like this before, I approached Mr Google who kindly provided me with a Tap-Drill Chart.


TapDrillChart.JPG
(76.29 KiB)


“To Tap This Size Screw Or Bolt” 5mm
“Use This Drill Bit” 4.2mm

No 4.2mm drill bits in the collection – so a trip to Mica around the corner.


Mark the bit with some masking tape to indicate a depth of 15mm
Drop of oil in the hole, and drill slowly till required depth.
Clean up using the vac.

The Tap also gets some oil and is then turned very slowly into the whole.

Clean up using vac.

Test hole with 1 of the bolts.
Fits (big sigh of relief)

Carry on and do all the other holes.

First go with switch on side – a stuff up.
Power cord will interfere with bottom saw arm.
The capacitor catches on the table top.


First Try.jpg
(34.52 KiB)


Move it to the other side, but turn the switch box around.

The techy used some large blocks to connect which I then changed to smaller blocks to fit it in.
Also extended and connected the earth wire.


Turm wiring around.jpg
(38.28 KiB)


Next problem – the cable connector is too large and catches on the bottom plate.


CableCatchesPlate_2.jpg
(26.02 KiB)


CableCatchesPlate.jpg
(21.92 KiB)


Will go and see what is available.


Next problem ………………..

The drive end of the motor is %*$%$*$$ not quite the same as the old motor.

The pulley sits right back and the large pulley wheel cannot be used. (this is BIG sh!t)


Shaft_Pulley_1.jpg
(26.54 KiB)


The motor shaft is 11mm, so if I stick a washer in, then the pulley will stand out enough to be able to use all 4.


Shaft_Pulley_2.jpg
(27.28 KiB)


The pulley fits ‘loosely’ on the shaft, so it just might need a small hole and screw.
Drill + tap + allenkey head flush screw. (this is getting very complicated …………)


Will have a look tomorrow.








.
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Re: Motor heating

Postby Robert » 12 Oct 2020, 16:07

Looks like you are getting there. I might have been tempted to extend all the wires emerging from the motor and put the box somewhere else...just make a smaller cover for the terminals and cord grip.

What is inside that box? looks like some kind of overload trip?
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Re: Motor heating

Postby Phil » 13 Oct 2020, 07:41

Robert wrote:I might have been tempted to extend all the wires emerging from the motor and put the box somewhere else...just make a smaller cover for the terminals and cord grip.


That is plan B.

Will go and have a look this morning for a shorter connector.


Robert wrote:What is inside that box? looks like some kind of overload trip?


I am not quite sure. This is way beyond my knowledge. :o
I can change a socket and light bulb :lol: :lol:
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Re: Motor heating

Postby Phil » 14 Oct 2020, 10:15

Progress is slow, but I am getting there.

Power cable connector has been changed, so that problem is out the way.

Motor fitted to base plate and offered to the machine.

Oooooooooooooo, craps, the capacitator is in the way of the table.
The table is tilted to the left for easier access.

CapacitorTooHigh.jpg
(31.53 KiB)



Solution - an extension arm

Capacitor Extension arm1.jpg
(33.68 KiB)


Capacitor Extension arm2.jpg
(25.88 KiB)



Next job - is to align the motor + pulley to the driving pulleys.
Need to build up some patience first.
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