Author Topic: Fan removal  (Read 13289 times)

Offline John Rudd

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Fan removal
« on: April 01, 2016, 09:56:49 AM »
I need to remove the fan on my Bridges drill.....
Any suggestions that dont involve its destruction?
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Offline awemawson

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Re: Fan removal
« Reply #1 on: April 01, 2016, 10:27:28 AM »
With the armature out of the body can you not press the shaft out of the pulley ?
Andrew Mawson
East Sussex

Offline John Rudd

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Re: Fan removal
« Reply #2 on: April 01, 2016, 11:19:36 AM »
Andrew,
The motor assembly is a complete unit and fits in from the back of the housing, the retaining screws are under the fan....there is no way to remove the armature from the assembly without removing the fan first....

Its a Stanley Bridges drill from the 60's.... If you recall them?
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Offline awemawson

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Re: Fan removal
« Reply #3 on: April 01, 2016, 11:34:52 AM »
Not only recall, but had one that I inherited from my Father  :thumbup:
Andrew Mawson
East Sussex

RobWilson

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Re: Fan removal
« Reply #4 on: April 01, 2016, 12:42:28 PM »
More info John mate , whats the fan made of , aluminium ,plastic , cheese !

Rob 

Offline John Rudd

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Re: Fan removal
« Reply #5 on: April 01, 2016, 12:46:40 PM »
More info John mate , whats the fan made of , aluminium ,plastic , cheese !

Rob

Cheese....funny haha.... :lol:

No mate, its made of plastic with what looks like a brass boss pressed into it.....
I've looked in to the blades hoping ( ha!  :scratch:) that there may have been a grub screw.....

I remember my dad changing the innards on one of these when I were a nipper ( he was always burning them out), but have no recollection of how he got the fan off....I think if I asked him now he'd just shrug......
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RobWilson

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Re: Fan removal
« Reply #6 on: April 01, 2016, 12:54:49 PM »
Quote
Cheese....funny haha.... :lol:
:)


Arh I know the type , designed to break as soon as you go near them  :bang: , any chance you can get a couple of wee tapped holes into the boss ?  and make up a small puller , in the past I have resorted to drilling two holes through the fan close to the boss 180 apart so that I could get the puller legs to the back of the boss .


Why your repairing it mate ? 


Rob     

Offline John Rudd

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Re: Fan removal
« Reply #7 on: April 01, 2016, 01:06:43 PM »
Why repair? Ermmm well not so much a repair but a refurb....sentimental reasons....
(err no 'mental' jokes plz... :lol:)

Yes I think you are correct, the fan is collateral for a repair....crap design....
I spose  I could cut the fan from the boss, take off the boss, make a new one and remount the fan?
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Offline DavidA

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Re: Fan removal
« Reply #8 on: April 01, 2016, 04:23:20 PM »
John,

I'm having a bit of trouble with the logic of this.

No matter how it was assembled, surely it must be possible to disassemble it in the revers.

Dave.

Offline hermetic

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Re: Fan removal
« Reply #9 on: April 01, 2016, 04:27:01 PM »
Can you not drill a couple of holes in the fan to line up with the screws. My dad also had one of those drills, and now I am trying to remember what happened to it! Bet my brother has it!! The fan doesn.t unscrew by any chance, that is in the same direction as rotation so that rotation would keep it tight?
Phil

RobWilson

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Re: Fan removal
« Reply #10 on: April 02, 2016, 04:03:34 PM »
Why repair? Ermmm well not so much a repair but a refurb....sentimental reasons....
(err no 'mental' jokes plz... :lol:)



Was actually going to go for a Yorkshireman joke  :lol: :lol:   :)


Anyway is it off mate ?    :poke:



Rob


Offline John Rudd

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Re: Fan removal
« Reply #11 on: April 03, 2016, 11:04:26 AM »
Nope!
A closer look at it, showed that the fan is moulded around the metal boss....so the back side of the boss is covered by the plastic fan.....

I'm guessing if I want this off it aint coming off whole.....

I just wonder if some localised warmth from my hot air desoldering station might be enough to free the boss from the shaft without melting the fan?

Thoughts? :scratch:
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Offline awemawson

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Re: Fan removal
« Reply #12 on: April 03, 2016, 12:46:32 PM »
John,

The whole fan / armature assembly MUST come out of the field coils somehow. Give us a few photographs of the rear end. There will be a way of removing the brushes, and they will need to come out first. I bet that the back end of the armature sits in a bearing which sits in the die-casting - may even be a self aligning spherical bronze bush.

Have you seen this video:


Andrew Mawson
East Sussex

Offline John Rudd

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Re: Fan removal
« Reply #13 on: April 03, 2016, 01:34:05 PM »
Andrew,
I appreciate your comments.....but....

The way the 'motor' is assembled is like this:

Take the field coil assembly, insert from the front, the armature, carrying its front bearing and support bracket. Add from the rear, the rear bearing support bracket c/w  brush box assembly. Now, from the front support bracket add the through bolts to clamp the assembly together. Add the brushes to the holders.

Job done....

The rear bearing housing is bolted on from the front so it cant be removed......
So, basically the fan has to be removed first, the front bearing housing is fastened to the drill casing from the front too, the securing screws are behind the fan, once removed, the whole motor assemble emerges from the back of the drill housing......You can see the mounting lugs in the body around 7:13 in the video....
His strip down was made easier because his fan had broken in two...
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Offline awemawson

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Re: Fan removal
« Reply #14 on: April 03, 2016, 02:37:41 PM »
Can you not drill a hole through your fan to line up with the offending retaining bolts, and unscrew them  :scratch:
Andrew Mawson
East Sussex

Offline John Rudd

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Re: Fan removal
« Reply #15 on: April 03, 2016, 03:21:45 PM »
Andrew,
I could do as you suggest....
But if you look at the vid, there is a largish hole behind the fan so there is little to press against....

I'm beginning to think about how Im going to make a new fan :scratch:
Maybe cut out a circle of thin ally sheet, make some cuts to form twisted blades, secured to a brass bush at the centre? Thoughts?
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Offline John Rudd

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Re: Fan removal
« Reply #16 on: April 10, 2016, 04:50:02 AM »
Ok,
An update on this....
I successfully removed the fan from the motor shaft and got the rest dismantled....Time now to clean up all the bits and fit some new bearings....

Sadly though, on one drill, I managed to break the fan :palm: So I need a new one so that I can rebuild that one too....( I think I got a bit of an obsession going on at the moment, I've got 9 Stanley Bridges drills in total and a couple more on the way.... :Doh:)

Got to have something to keep me busy! :lol:


So ideas please on how to make a new fan......
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Offline Swarfing

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Re: Fan removal
« Reply #17 on: April 10, 2016, 06:08:45 AM »
Use the good one as a plug to cast new in Ali?
Once in hole stop digging.

Offline John Rudd

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Re: Fan removal
« Reply #18 on: April 10, 2016, 06:56:34 AM »
Hmm... Nice idea..... :beer:

But not got any casting facility here in my shop..... :scratch:

Now, I wonder...... :coffee:
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Offline awemawson

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Re: Fan removal
« Reply #19 on: April 10, 2016, 07:09:03 AM »
Looks like a good candidate for one of our 3D printing enthusiasts to be unleashed on   :wave:
Andrew Mawson
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RobWilson

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Re: Fan removal
« Reply #20 on: April 10, 2016, 07:21:14 AM »
Machine from solid  :thumbup:    should only take an hour or so  :dremel:



Rob

Offline John Rudd

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Re: Fan removal
« Reply #21 on: April 10, 2016, 07:32:46 AM »
Machine from solid  :thumbup:    should only take an hour or so  :dremel:



Rob

What a waste of material........!! Have you been drinking again Rob? :lol:

Think I might have to resort to your idea...... :coffee:  Time for a rummage in the scrap box.... :dremel: :dremel:
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Offline John Rudd

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Re: Fan removal
« Reply #22 on: April 10, 2016, 09:49:16 AM »
So look what I found?...... :)


Looks like I'm going to be busy making a new fan after all....... :dremel: :clap:
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RobWilson

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Re: Fan removal
« Reply #23 on: April 10, 2016, 11:59:00 AM »
 :lol: Is that solid billet aluminum  John , the good stuff  :lol: :lol: :lol:

IS IT  DONE YET !  :poke:



Rob  :beer:

Offline John Rudd

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Re: Fan removal
« Reply #24 on: April 10, 2016, 12:10:54 PM »
Rob,
Yup solid aluminium.....approx 10 in long.....

I need to work out how I'm going to cut the curvy fins.... :scratch:
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