Drilling lead takes a different chip breaker angle on the bit and lubrication. Otherwise is going the lead is going to gall up on the cutting edges seize. A hammer drill is a pretty hack way of breaking up the chip. It would be better to find an actual machinist. Since lead is not the most common thing to machine expect hell need to research how the drill is sharpened in the machinist handbook. You should also ask for RPM and cutting fluid recommendations.
Phil Agur <http://www.catalina27.org/public_pages/profile270.htm> s/v Wing Tip Secretary, Call Sign WCW3485 IC27/270A MMSI 366901790 <http://www.catalina27.org> www.catalina27.org Vessel Doc# 1039809 -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Rudolph S. Behar Sent: Monday, June 23, 2008 3:04 PM To: [email protected] Subject: Re: catalina27-talk: Keel bolts I tried to do it myself and ended by breaking two new and strong steel bits. Local yardman did the work for me. Siad it took him 7 hours. I know him and believe him. HE used a 3/4th hammer drill. And it cost. No problems since. If I had to do it over again I'd not partner the old bolts, but set the new ones (six of them) in a fresh pattern at some remove from the originals. I've had no problems, but it seems good sense not to be too close to the originals. The old bolts seemed to be ferrous. I put in stainless for the new ones. Rudy B. Phoenix, #2237 Pasadena James Calleran wrote: Listees, After a, ahem, hard grounding, my Catalina smile has reappeared (last seen 6-7 years ago) not badly, but a thin line at the keel joint is visible on one side. The boatyard service manager has recommended re-torque-ing the keel bolts. Naturally, the yard will do the job for a fee, though I don't have a quote. I'm concerned about these 30 yr-old bolts breaking off under 60+ ft-lbs of torque. Any of you who have done this yourselves: 1. How did you clean off the accumulated rust (They were rusty, right)? 2. Were you able to budge the nuts? 3. Did you remove them one at a time, of course and clean the threads? 4. Did you replace with stainless nuts? 5. What torque? For those who have installed SS Lag Bolts in your keel. 1. Did you buy the $279.95 kit from Catalina Direct? (5 bolts, 1 drill bit, washers) 2. What size is the drill bit? 3. Did drilling require a rotary hammer type drill, or just a powerful standard drill? I have source of SS 1/2" x 8" SS lag bolts @ 14.95 each. Specs say 18-8 stainless; no mention of 316. Thoughts on using these? Thanks for comments on your experience. Fair Winds, Jim Calleran, C27 #2784, Trad, OB Mathews Yacht Club, VA 37°27.8'N/76°18.6'W
