Adding a topping lift, or the heck with sheaves - Page 3 - SailNet Community

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  #21  
Old 04-29-2014
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Re: Adding a topping lift, or the heck with sheaves

Alaska,

I'm a little late to the party, but I have something to add: You should be using clevis pins and cotters to attach the halyard sleeves to the masthead. Nuts and bolts, even when using nylocks and locktite can work loose. The rigger's way is to use clevis - add SS washers to shim the pins to both relieve stress on the cotters and to prevent movement.
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  #22  
Old 04-29-2014
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Re: Adding a topping lift, or the heck with sheaves

Thanks George. That is a good point and all the sheaves that are for my masthead come with the pins etc from Dwyer.

On the drilling end, WOW, these things are like nothing I have ever tried to drill out before. Any tips anyone? I flattened my punch just trying to get a dent to drill into. About to go grab an angle grinder to do it.
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Re: Adding a topping lift, or the heck with sheaves

They are almost certainly stainless. You want new/sharp cobalt bits, low speed, cutting oil, and pressure so that you make progress on every blade rotation. If the bit just spins it will work harden the stainless and make it harder than a high speed steel bit.

I'd be drilling off the concave part of the pin. Once the head comes off (not much material to remove) you just use a pin drift to knock the pin out of the masthead.
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  #24  
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Re: Adding a topping lift, or the heck with sheaves

Alaska,
Stainless is so much fun! Stainless is very hard so drilling generates a lot of heat and work tempers the steel. You need to buy a set of colbalt drill bits. Carbide will do in a pinch but will get dull. "normal" bits just get dull and won't cut SS. Use cutting oil to keep the work "cool" and well lubricated. Drill very, very slowly and use a lot of pressure on the drill. When done properly, the drillings should come out in "twists" If it is coming out in "chips", you are probably drilling too fast.
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  #25  
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Re: Adding a topping lift, or the heck with sheaves

Done! But these are not pop rivets in the normal sense. I went down to get a grinder after little to no luck with my good bits and cutting oil. So, while picking up the grinder I show the little block with these on it to the salesperson. He had never seen such a thing and we hear a guy laughing behind us hearing us talk of drilling them out. He was a Navy machinist. He said he had ground off tons of these fittings before. They are a rivet of sorts but a custom make with a special press that puts them together. He said to grind the conclave side of the stud until the washer came off. Then tap out the head with a punch. He was right. Took about 30 seconds each.

The shafts on these are solid stainless and heavy. You would have a heck of a time drilling the "head" side of these as you will go through about a 1/4'' of material before you can do any good. The other side on the other hand is about a 16th and done.

Maybe you can drill these out, but after doing them I would recommend a grinder. These are definitely not pop rivets and are not going to drill out like one.

Now onto finding the sheaves to replace it. Thanks for all the help on this everyone.
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Re: Adding a topping lift, or the heck with sheaves

That is why I recommended drilling out the "tail" (concave) part of the pin. I've removed rivets like that with a drill and it worked just fine. A grinder also works, you just need a steadier hand to avoid marking up any of the surrounding metal.
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Re: Adding a topping lift, or the heck with sheaves

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Originally Posted by Alex W View Post
That is why I recommended drilling out the "tail" (concave) part of the pin. I've removed rivets like that with a drill and it worked just fine. A grinder also works, you just need a steadier hand to avoid marking up any of the surrounding metal.
You were right on going for the tail of the pin thats for sure. The grinder was really easy and all is well. Now I am shopping for sheaves. Oh joy, never knew how many different sizes there were out there. Mine is 1 3/8 OD, 1/4 ID, 9/16 wide, pretty specific and I actually just found them amazingly. Now I hope I can get them as we splash in two weeks time and there is still a pile to do.
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Old 05-01-2014
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Re: Adding a topping lift, or the heck with sheaves

If for whatever reason you replace those pins you drilled out with bolts, get bolts that are too long so that the part the sheave rides on is smooth (no threads). Then cut off the excess threads on the other side of the mast head. Most sheaves will have some kind of a metal collar that they ride on, but the threads on a bolt can still chew them up, so getting rid of the threads helps a lot.
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Re: Adding a topping lift, or the heck with sheaves

A short length of ss shaft and drill for pins on both sides solves the thread problem.
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Re: Adding a topping lift, or the heck with sheaves

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Originally Posted by Memopad View Post
If for whatever reason you replace those pins you drilled out with bolts, get bolts that are too long so that the part the sheave rides on is smooth (no threads). Then cut off the excess threads on the other side of the mast head. Most sheaves will have some kind of a metal collar that they ride on, but the threads on a bolt can still chew them up, so getting rid of the threads helps a lot.
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A short length of ss shaft and drill for pins on both sides solves the thread problem.
Good points guys. But, I have already gone the pin route as suggested by George. In fact just got back from WM after having my wallet emptied and my credit maxed.

How is it that happens every time I enter that place? I feel woosy, don't remember exactly what happened, have a car full of stuff and my bank is calling me due to unusual activity. Well, that last one has stopped due to it being usual activity. Truly, who cares, I have a big bag of stuff to go through.
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