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Old 03-26-2009, 05:41 PM   #1
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Clear screen

I have a rotating clear screen which is giving up the ghost. If I help start it with a spin it will go for about 30 minutes before stopping, but at nothing like its original speed.
Only data I can find is on a plate with
VISTA
Centerless Ind Co Ltd Tokyo
CM 300 -H
*I would really like to find an exploded view before I tear it apart (it's probably brushes) so I can either avoid having a 30cm, hole in the windshield, or at least have the plywood ready to fill the hole.
Anyone got any knowledge of this animal?
Jon
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Old 03-27-2009, 08:19 AM   #2
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RE: Clear screen

Will try to add some pics. to see if that stimulates any responses.
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Old 03-27-2009, 09:43 AM   #3
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RE: Clear screen

Well, I'll jump in where angels fear to tread - If it were my boat and I didn't know anything about the unit's innards (and I don't), I'd start be taking those two screws out of the back and gingerly loosening the motor. That might reveal the next step, and if not it can probably be reassembled pretty easily.

OTOH, it would be better if someone who has taken one of these apart would respond.

- Peter
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Old 03-28-2009, 03:29 AM   #4
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RE: Clear screen

This looks like a knock off opf the Kent Clearview screen.

Perhaps some googeling?
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Old 03-28-2009, 05:45 AM   #5
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RE: Clear screen

Jon,I am with Peter Mc,
12 volt motors should have an armature, commutator and bearings/ bushings on each end, much like a starter. I have had success in the past with similar items by cleaning the commutator with emery cloth, checking for excessive brush wear and downward spring tension, and lightly oiling the bushing area to assure free rotation. Gu sure to mark matching areas of the housing before disassembly. If you need any parts a starter shop may be able provide.
Steve
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Old 03-28-2009, 06:12 AM   #6
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RE: Clear screen

Ok I give up! what is it? What is a "clear screen".
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Old 03-28-2009, 08:38 AM   #7
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RE: Clear screen

Spins real fast to throw water / ice, etc. off. Kinda like a fancy windshield wiper.
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Old 03-28-2009, 02:23 PM   #8
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RE: Clear screen

And when it works it's fantastic. Sure missed it today heading south ino all the slop in St Joseph Sound.
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Old 03-28-2009, 02:29 PM   #9
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RE: Clear screen

FF
Many thanks for the tip. SO far I'm only finding 110V/220V big ship stuff but I'll keep looking.
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Old 03-28-2009, 02:35 PM   #10
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RE: Clear screen

Forklift,
sounds like the way to go but I think once I start I'll end up with my 30 cm. hole as to get at the front bearing where the brushes look to live I'll have to pull the screen.Guess it's back to the duct tape and clingwrap.
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Old 03-28-2009, 02:51 PM   #11
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RE: Clear screen

Once you figure out what you need, I'd try www.mcmaster.com or www.grainger.com first.
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Old 03-29-2009, 03:40 AM   #12
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RE: Clear screen

"SO far I'm only finding 110V/220V big ship stuff but I'll keep looking."

The big boy's stuff has heaters in the disc to help clear the ice!

Not usually a cruising option for small boats.

Could have used it one year as we sailed from NYC to FLL at the end of Jan. Not a bad trip as the bays were ice free , and the hatch could be slid closed (seat below) so only ones head was exposed , and that was washed in warm air from below.



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Old 03-30-2009, 08:48 AM   #13
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RE: Clear screen

Went with the angels and pulled the back cover off exposing brushes. Pulled the brushes against their springs a couple of times, reassembled it and its working. Seems to be a little more noise than I remember but that might be just a little roughness on the brushes. The screen rotates very easy without power.
Would contact cleaner and q-tips help on the commutator??
Many thanks to all.
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Old 03-30-2009, 07:43 PM   #14
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RE: Clear screen

Jon,Emery cloth would help on the commutator- I do it often. You are removing material from the surface to get back to clean brass. Sometimes I use a paint stirring stick with about 1' of 120 or so grit folded in 1/2 to access the commutator between the brush holders on industrial DC motors after replacing the brushes. I have someone operate the motor to make it spin while I insert the wooden paint stick and move it up and down as needed. In your case- if you can remove the brush holders and end of the motor- just wrap 2-3" around the commutator and twist it back and forth till shiny.
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Old 03-31-2009, 09:28 AM   #15
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RE: Clear screen

Will be in a marina later in the week so will source some emery cloth.
Thanks
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Old 04-17-2009, 06:07 PM   #16
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RE: Clear screen

I've always been told 'Do Not Use Emery Cloth On Electrical" equipment. The grit is conductive. Maybe ok at 12v systems but I never tried it so from experience can't say.
I've cleaned lots of motors but never used emery.

There are lots of other grits on the market that are not conductive and readily available
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Old 04-19-2009, 08:17 AM   #17
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RE: Clear screen

*Running offshore a few miles from Naples with a chop putting spray onto the front windshield, and the Clearscreen doing the job. I used q-tips and contact cleaner to scrub at the comm. I got emery cloth butdidn't want to risk pulling off the brush holder to get at more of the comm. It will not roate with the back bearing cover removed.
Making towards Little Shark River and was planning initially to go around Cape Romano, but think I'' go in at Capri Pass and try the inland route.
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Old 04-24-2009, 05:45 PM   #18
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RE: Clear screen

Never use emery cloth to polish a commutator. It is conductive and will lead to shorted bars and grounds. Use fine sandpaper or a commutator stone. Wrap a strip of fine sandpaper around the comm with grit up and lower the brushes onto it after you have polished the comm, turn it a few times with the brushes rubbing on the paper and they will be smooth and match the comm radius. This should give you a few more years of use.
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Old 04-26-2009, 08:09 PM   #19
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RE: Clear screen

Sorry guys- I need more info on emery cloth being conductive. I did a google search and found a couple of "I heard's". I am interested to find out the reason it is conductive. I heard years ago if you placed a charged battery on the ground it would discharge. I found out later that it was due to the case construction materials used at the end of WWII. Of course this no longer applies. Any links??Steve*
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Old 04-27-2009, 07:37 AM   #20
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RE: Clear screen

http://www.morgancarbon.com/technica...aintenance.htm

Among hundreds of others. Use what you like, just make sure you clean all the dust and filings out very thoroughly.
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