[GreenKeys] M33 Motor fan...

[Brad]

Good(ish) news.  First, I got the fan off in one piece, although it required the (gentle) use of a prybar.  The shaft was so bad repeated attempts at freeing it with PB Blaster did not work.  Anyway, that’s solved.

 

Then the slow blow fuses arrived in the mail.  Low and behold, the machine started up instantly.  Motor runs fine.

 

Now we have a ‘new’ issue, which I recorded in this video:

 

https://drive.google.com/file/d/0B4pq0-BHd2x6SXUyZjZPQ0ptUU0/view?usp=sharing

 

Not sure why it’s not hitting the printhead with full force or advancing the carriage.  

 

I note, a couple of times while learning I accidentally wound the motor backwards (this was before I could get it to power on), and it actually caused the striker to hit the print head with the proper force and advance the carriage.  Don’t know if that accidental info helps any.

 

Many thanks for all the help thus far!!

 

From: GreenKeys [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of teletypeparts at comcast.net
Sent: Saturday, November 5, 2016 11:10 AM
To: Gartland, Kenneth <trnsrme at gmail.com>
Cc: GREENKEYS BULLETIN BOARD <GreenKeys at mailman.qth.net>
Subject: Re: [GreenKeys] M33 Motor fan...

 

Brad,

 

This is good advice.

 

Wayne

 

  _____  

From: "Kenneth Gartland" <trnsrme at gmail.com <mailto:trnsrme at gmail.com> >
To: "greenkeys" <GreenKeys at mailman.qth.net <mailto:GreenKeys at mailman.qth.net> >
Sent: Friday, November 4, 2016 10:30:37 PM
Subject: [GreenKeys] M33 Motor fan...

 

Hi

Note for Brad re: his seized motor fan...

I have seen this problem many times...

Most likely, the set screw was over torqued during assembly
and it resulted in a raised "Circular" indent in the motor shaft
where the set screw was positioned...

Two possible fixes...

Remove the set screw completely from fan hub, and fill
the hole with a good penetrant oil such as PB Blaster,
Liquid Wrench etc.

Let it soak in awhile and then holding the pinion end of
the motor shaft (Pinion removed) with the mounting screw
only in the end of the shaft, use this screw to hold the shaft
while trying to rotate the fan counter and counterclockwise
direction to see if it loosens up...

This usually works, if not, then brute force is required by using
a pair of wide flat blade screwdrivers, one opposite to the 
other, and prying them together in a reverse direction to force
off the fan...A second pair of hands to hold the motor casing
while you do this is real handy!

In any case, when you get it off, the scored area on the
shaft where the set screw was positioned shud be sanded
down with ultra fine emery cloth, or a similar product
known as Crocus cloth...

When reassembling fan to shaft, place a thin smear of grease
to area inside fan hub before positioning & tightening set screw...

It will never cause you grief again!

Good luck!

Cheers!

Ken
VE3-HMQ


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