Old Autohelm drive-cog

[Inselaffe]

Any advice/ideas please?

I inherited an old Raymarine Autohelm 800 with Bulli. It looks all in very well kept order but the little plastic drive cog (6 or 7 mm diam) that fits on the electric motor and drives the whole thing through a rubber belt is broken. the motor goes when I press the buttons, so I think otherwise its ok.

I already contacted Raymarine service but they told me that the cogs are like rocking horse poo poo, and that the design was changed ages ago and the moulds were made specifically for the part and have died.

I thought that as this sounds like a common problem maybe as a last chance saloon someone here could have an idea?

I tried sticking it together (dad knows a plastics firm and they used 'proper' glue) but it didn't work (pressure fit onto shaft, split again straight away), I wasn't too happy about that approach anyway.

Its a shame to throw it away because of just that little, if essential, part.

Leigh

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[fireball]

Is there not a local engineering shop that could make one up for you?

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[AndrewB]

They really were pathetically weak, looking like Lego cogs (Maybe they actually were?). No wonder Raytheon have run out of spares.

When one of mine went, I had a brass replacement cut. That was 15 years ago.


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[Inselaffe]

Thanks,

AndrewB: How did it fit onto the motor spindle, the same way as with the plastic one, with a 'flat' across the hole in the cog and then a tight push on fit?

I thought that it would be too expensive to get someone to make a one off considering all the measuring and setup time, but seems like I was wrong.

Leigh

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[scarlett]

My plastic cogs went in 1998 and Raymarine, as was, sent me the same in what looked like zinc castings. I managed to glue the old ones with epoxy and they did weeks of helming on the French canals till the new ones caught up with me.

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[wooslehunter]

I had one go at the beginning of this season. Since I live 5 miles away I went into Raymarine. They had nothing on the computer but a really helpful lady did find a replacement metal one.

Worth asking again perhaps or maybe I had the last one.

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[cliff]

<A target="_blank" HREF=http://www.sdp-si.com/Plastic_Gears.htm> here </A>

or

Engineering Plastic Supplies Ltd
10 Haleys Yard
Bramley
Leeds
LS13 3LA (Road Map)
West Yorkshire
Tel: 0113 255 0666
Fax: 0113 256 3992

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[AndrewB]

Yes, it just replaced the plastic one. It was made for me by an antique clock-repairer in Whitstable, partly as a favour so I can't confirm whether this is normally an economic solution. But it might be worth checking your local yellow pages and asking.

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[FullCircle]

Autohelm or Raymarine would have used a proprietary item, so I would send the bits of our old one to a gear specialist as mentioned on this page and they WILL find you a suitable replacement. May need to shim or pack other bits, but it can be done. After all the gear hobbing machines only come in a range of standard sizes unless youpay fortunes for non standard product. But then again it is a marine company........

<hr width=100% size=1>Jeanneau 35 - only 13,272 lbs displacement, not even 6 tons,what a lightweight!!!

 

[William_H]

I suggest you start collecting juck and ripping it apart to check for the little nylon drive gears on the motors. Video recorders will have 2 or 3 and many toys have electric motors most driving cogs similar to what I imagine you are seeking. Generally the larger the motor the larger the cog so a battery hedge trimmer or possibly old electric drill have alarger motor shaft and cog than most toys.
I feel there are not that many sizes used. Good luck don't give up regards will

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[hightech]

The early plastic cogs were a common failing and were replaced by a cast metal on part way through production. They were available as a spare part and whilst the factoory may have run out, many dealers had them and most likely will still have stock on a shelf.


Fair winds.

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[Inselaffe]

An Update,

I contacted HPC Gears Ltd who were very helpful but estimated 100 quid, no doubt cause it's a one off piece.

I blanket emialed all the dealers in UK (>100!) and Germany (~20) from the Raymarine webstie, and although most replied negative I found 3 from Greenham Regis Marine Electronics in Poole and rather greedily bought them all at 3 quid each in case they keep breaking.

(Part No M098)

datayacht also had one (2 quid), and New World Yacht Care too (9.95).

ROWLANDS MARINE ELECTRONICS LTD had a motor with gear for 22quid,

Also, A-N-T Ltd"I will probably have one but it might be attached to a motor with a special sealant they use, if u send me the old motor I will replace with a new motor with cog attached and just charge u for the cog and keep yr motor"

Hartlepool Marine Supplies "We have a large quantity of "Used equipment" in our warehouse,"

Maybe this helps someone with a similar problem