Hi Robbin, I haven't seen all your posts ,so I hope I'm not repeating what has already been said. I would forget plastic all together,all that type of plastic will flow (squish) out of shape,maybe Delrin would work but it could crack. Use a bronze bushing, it is very happy next to the SS pin and the cast iron. Look for something with the correct I D and bore the centerboard if necessary or find bronze rod and drill the i d. If trunk clearance allows you can make it a little proud of the centerboard width. I can't think why it should be bonded with epoxy, if it's only close to being the right size it can't go anywhere. Let me know if I can help Stan --- On Mon, 12/27/10, robbin roddewig <robbin.roddewig@verizon.net> wrote: From: robbin roddewig <robbin.roddewig@verizon.net> Subject: Re: M_Boats: Bonding in bushings To: "For and about Montgomery Sailboats" <montgomery_boats@mailman.xmission.com> Date: Monday, December 27, 2010, 5:29 PM Sorry folks, never mind. The System 3 epoxy book says that it does not bond Teflon. Guess I just proved that. It does say it will bond "Thermoplastic materials like vinyl plastics or ABS". Does Nylon fit in the category of a material that epoxy will bond to well? Thanks Robbin On 12/27/2010 7:43 PM, robbin roddewig wrote:
Hope everyone is having a good holiday! I just took off my C clamps and tried to remove the tubular rod that had been setting the position of the bushings I had epoxied into my centerboard and the bushings also broke out. I had some weeks ago asked about bonding in brass bushings to the steel centerboard and based on the advise I got decided that teflon or in the case of what I got Rulon bushings (reinforced PTFE) would be best for the center pin hole on the M-23 board I am trying to finish. So I let the epoxy set for a week and a half over some days that exceeded the 35 degree min for the fast hardner mix. The epoxy had definitely cured but the bushings did not bond in very well apparently. The bushings are meant to be very slippery so I suspect I am going to need to help give a rough surface for mechanical bonding by scuffing up or roughing up the surface that mates with the centerboard. I know some sailors said they had teflon bushings in the centerboard hole. Are these bonded in? Press fit? Any ideas of suggestions that might improve the outcome of a second try would be much appreciated.
Thanks Robbin M-23 & M-10
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