A proper outside/yard machinist should have the facilities in ready to quickly and with relative ease do this type of work for you.
I know this might sound like a great project, but even with my experience in manufacturing and fixturing and machining, I would probably still call someone with a proper portable drill press to do this work. I know of one shop local to me who has such facilities, let me know if you want their contact info- owner is a liveaboard even! On Mon, Apr 20, 2020, 1:27 PM Tom Buscaglia via CnC-List < cnc-list@cnc-list.com> wrote: > Thanks Chuck. I had measured using a old style caliper and then reading > it on the scale on my digital caliper which came out as 75mm. But after > your caution I decided to waits for a real micrometer to get the true(r) > measurement. > > I think that drilling the hole for the through bold will be a huge PITA as > the short end of the arm is facing the transom and the vertical support we > put in to reenforce the deck. Also, there's not much room there. Should > be fun... > > Tom B > > At 06:46 AM 4/20/2020, you wrote: > > Message: 2 > Date: Mon, 20 Apr 2020 08:11:17 -0400 > From: Stus-List Linear Auto Pilot install 37+/40 > To: <cnc-list@cnc-list.com> > Subject: Re: Stus-List Linear Auto Pilot install 37+/40 > Message-ID: <01ec01d6170c$cc1ce360$6456aa20$@comcast.net> > Content-Type: text/plain; charset="UTF-8" > > Tom, > Thought I'd weigh in as a former Edsonite.. The most important thing to > realize when installing the autopilot is that the clamping action of the > arm and cap for the tiller arm is the primary form of attachment to the > rudder post. Edson makes the arm with a .002" clamping tolerance to the > diameter of the rudder post. The secondary or "failsafe" attachment is a > key, through bolt, or set screws. When you order your tiller arm, don't > assume that C&C always used the same diameter stainless post for every boat > and model. It's important to get precise measurement of the post where you > wish to attach the arm, preferably using a digital caliper to achieve the > proper tolerance. Measure the exact diameter of the post, and take several > measurements as you rotate the caliper around the post at a variety of > positions where the tiller arm will attach. When Edson bores the arm to > your specification, they'll insert a small piece of paper between the arm > and cap. Removing it will give the arm the proper undersized clamping > tolerance needed for the arm to grab the post without slippage. Again, the > keyway or through bolt should prevent the arm from rotating ONLY if the > clamping tolerance is compromised, as in a hard grounding, rudder stop > failure, or other drastic event. > > As you've found, if there's no accessible keyway cut in the post, the > through bolt method is preferred if the post is hollow (typical with SS > posts) or set screws if the post is solid (usually with a bronze rudder > post). Getting the arm positioned to drill the post and tiller arm can be > problematic, finding a drill bit long enough to get it in place and then > drilling through the hard steel (thus the need for a carbide bit and some > lubricating oil to prevent work hardening the bit) but avoid the temptation > to "pre drill" the arm before installing on the post. This is because the > likelihood of you being able to match up the holes on the post with the > holes on the arm are not great given the confined space you'll have to work > with and the difficulty of keeping the drill level while you work. > The tiller arm has a very important plus side as it enables your autopilot > to serve as an emergency tiller in the event of a steering system failure > such as a fractured radial drive, cable breakage or idler failure. > Finally, make sure that the autopilot isn't set up as the rudder stop as > damage to the autopilot can occur. > Good luck with the install and Edson is a good source for advice.. > Chuck Gilchrest > S/V Half Magic > 1983 35 Landfall > Padanaram, MA > > >From: CnC-List <cnc-list-boun...@cnc-list.com> On Behalf Of Tom > Buscaglia via CnC-List > >Sent: Sunday, April 19, 2020 6:19 PM > ...snip... > >... greatly appreciated. If you want to support the list - use PayPal to > send contribution -- https://www.paypal.me/stumurray > > .¤º°`°º¤,¸¸,¤º°`°º¤¤º°`°º¤,¸¸,¤º°`°º¤. > Tom & Lynn Buscaglia > SV Alera > C&C 37+/40 > Vashon Island WA > (206) 463-9200 > www.sv-alera.com > > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > >
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