I spoke to PYI about the JEFA washers with bearings. Here is what I learned:
Bushings are about .4 inches tall. Each is custom made to the diameter of the shaft and retaining nut. Delivery is about 3 weeks. Cost is about $150. If the bottom of the retaining nut is not smooth and polished, add a delrin ring on top of the washer. I may just try two 1/8 pieces of delrin this fall. Joel On Fri, Aug 22, 2014 at 12:56 PM, Michael Brown via CnC-List < cnc-list@cnc-list.com> wrote: > I think Delrin, also called Acetal, is the material of choice for the > bushings. > > http://www.aetnaplastics.com/products/d/Acetal > > I had a machine shop make up a selection of thicknesses from tube stock > at a reasonable price - $80 for six pieces. > > I did take the rudder off, cleaned and checked it for straightness. I also > cleaned > out the rudder tube with a mild solvent and soap and water. I checked the > diameters on the shaft and tube. Since I do not know what there were to > start > with it would be hard to say if there was any wear, but both are round and > the > same size top to bottom. From that I would guess there was little wear. > > I have not seen a spec of what the clearance should be between the rudder > post > and tube. Trying to get an exact measurement of the rudder tube would > require > a bit fancier stuff that I was using but my guess is that Windburn has > about > 1/32" clearance. After greasing everything with Lubriplate sliding the > rudder back > in required a solid push. > > I replaced both the top and bottom bushings, left a very small clearance. > While on the hard I cannot feel any play in any direction. The rudder > swings > freely, either from the wheel or from the rudder. > > Michael Brown > Windburn > C&C 30-1 > > > > _______________________________________________ > This List is provided by the C&C Photo Album > > Email address: > CnC-List@cnc-list.com > To change your list preferences, including unsubscribing -- go bottom of > page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > > > -- Joel 301 541 8551
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