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PostPosted: Thu Jun 29, 2006 12:13 pm 
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Location: Oceanside, California
Hobie 18 Main Traveler Car - Bearings Ball/Cylinder sets

There is a necessary change to the Hobie 18 main traveler car due to a tooling problem. We had been back ordering cars and ball/cylinder sets for some time now. We can no longer get the injection molded bearing parts (the last batch was over sized).

The solution is a new dimension for the cylinders. The sliding action of the car is now quite satisfactory. Traveler bearing "balls" are no longer available. There are now two cylinders in every set. We will be machine fabricating only cylinders from now on.

We have shipped all back orders for bearing sets and are now shipping cars. The cars now come with a loose cotter key which allows removal of the bearings.

Installation: Remove the bearings, slide them into the track and then place the car onto the bearing pins. Then install the cotter key. (Users have the option of enlarging the cut away access point in the track as well).

A side benefit of this solution is that this will prohibit the car from falling out of the track.

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Matt Miller
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Hobie Cat USA


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PostPosted: Fri Jun 30, 2006 9:34 am 
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Location: Bakersfield, CA
Matt,

Is this something that is ultimately going fail and needs to be replaced now?

Tom Hundley


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 Post subject: Fail?
PostPosted: Fri Jun 30, 2006 10:39 am 
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No, traveler car bearings rarely fail. They may wear over time. I don't recall one just cracking or failing though. A number of cars are sold as replacements as the car can wiggle out of the track when trailering if left over on the starboard side.

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Matt Miller
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Hobie Cat USA


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PostPosted: Sun Jul 02, 2006 5:09 am 
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Location: West MI
Shucks' I liked the balls. Can you tell us what material they were made of? ABS Delrin, UHM, ??

I may see if I can figure a way to turn them on a lathe from rod. (Work, Infinate resources for prototypes)

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DVL 1989 H-18 Worlds Boat, Magnum Wings & Spinnaker

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 Post subject: Material
PostPosted: Sun Jul 02, 2006 8:13 pm 
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I would guess Delrin, but the latest ones seemed like glass filled nylon. I will have to check with purchasing

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Matt Miller
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Hobie Cat USA


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PostPosted: Mon Jul 03, 2006 7:53 am 
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Location: St. Louis, MO
DVL,

If you have a CNC or Prototrac lathe it will be easy.

Maybe a shaped bit that will cut a hemi-shpere at a time will work.

I would suggest Delrin for the material. Very good abrasion resistance, machineable, and strong.

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 Post subject: H-18 traveler balls.
PostPosted: Tue Jul 04, 2006 6:30 pm 
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Location: West MI
Yes that's what I was going to do. Cut a HSS tool bit on a Wire burn EDM machine to properly shape the tool bit.
Drill & C'Bore the rod material for the pin. Cut the material with the shaped tool bit until it is cut off the end of the rod. Repeat until you run out of rod. For a small volume you could use any engine lathe. For higher production a CNC or screw machine.

Background, Tool & Die & Mfg Engineer, Processes

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DVL 1989 H-18 Worlds Boat, Magnum Wings & Spinnaker

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PostPosted: Thu Aug 31, 2006 5:54 pm 
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Location: Washington, DC
Anybody know where I can get the replacement bearings Matt mentioned? Mine have worn down enough that the car is taking some unproductive joyrides outside the track.

Thanks,

Alex

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PostPosted: Fri Sep 01, 2006 9:50 am 
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Bearing are available through Hobie dealers.

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Matt Miller
Director of Parts and Accessory Sales
Hobie Cat USA


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