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#1
posted to rec.boats.cruising
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Sheave material
I need to replace some old plastic sheaves, and I have the option of sheaves
made of Delrin, acetal, or glass filled nylon. (I have learned that delrin is acetal, but don't know if all acetal sheaves are delrin). So what are the relative attributes of acetal and glass filled nylon sheaves? I read somewhere that GFN might be more abrasive on the pin, but I assume that it is stronger. Ronstan sells both, but their website doesn't solicit questions. |
#2
posted to rec.boats.cruising
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Sheave material
On Sat, 31 Jan 2009 09:35:42 -0500, "Garland Gray"
wrote: I need to replace some old plastic sheaves, and I have the option of sheaves made of Delrin, acetal, or glass filled nylon. (I have learned that delrin is acetal, but don't know if all acetal sheaves are delrin). So what are the relative attributes of acetal and glass filled nylon sheaves? I read somewhere that GFN might be more abrasive on the pin, but I assume that it is stronger. Ronstan sells both, but their website doesn't solicit questions. Why not give Ronstan or your local rigger a call and find out the pros and cons of each? |
#3
posted to rec.boats.cruising
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Sheave material
Frankly, I thought I'd get a better answer here.
It's really moot now, because I have a choice of GFN for only one size sheave(I need 3 different sheaves) . I'll probably get it and try it because the size might be better than the closest acetal sheave. "Wayne.B" wrote in message news On Sat, 31 Jan 2009 09:35:42 -0500, "Garland Gray" wrote: I need to replace some old plastic sheaves, and I have the option of sheaves made of Delrin, acetal, or glass filled nylon. (I have learned that delrin is acetal, but don't know if all acetal sheaves are delrin). So what are the relative attributes of acetal and glass filled nylon sheaves? I read somewhere that GFN might be more abrasive on the pin, but I assume that it is stronger. Ronstan sells both, but their website doesn't solicit questions. Why not give Ronstan or your local rigger a call and find out the pros and cons of each? |
#4
posted to rec.boats.cruising
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Sheave material
"Garland Gray" wrote in message ... Frankly, I thought I'd get a better answer here. It's really moot now, because I have a choice of GFN for only one size sheave(I need 3 different sheaves) . I'll probably get it and try it because the size might be better than the closest acetal sheave. My most humble apologies for not being able to give you the answer you sought. Seriously, this is one of those, "You pays your money, you takes your chances," sort of decisions that nobody else can really make for you. I thought the suggestion from someone else to talk to your rigger about it was spot on. For my own part, I don't like putting plastic parts anyplace where I can't inspect them on a regular basis, and would always choose metal sheaves if at all possible. |
#5
posted to rec.boats.cruising
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Sheave material
Perhaps I didn't state that clearly. I place a high value on serious replies
here. I wasn't complaining over just one response, or the quality of it. I'm not asking others to make my decision for me; but why try to reinvent the wheel ? The idea of newsgroups is to share experience, I assume. "KLC Lewis" wrote in message et... "Garland Gray" wrote in message ... Frankly, I thought I'd get a better answer here. It's really moot now, because I have a choice of GFN for only one size sheave(I need 3 different sheaves) . I'll probably get it and try it because the size might be better than the closest acetal sheave. My most humble apologies for not being able to give you the answer you sought. Seriously, this is one of those, "You pays your money, you takes your chances," sort of decisions that nobody else can really make for you. I thought the suggestion from someone else to talk to your rigger about it was spot on. For my own part, I don't like putting plastic parts anyplace where I can't inspect them on a regular basis, and would always choose metal sheaves if at all possible. |
#6
posted to rec.boats.cruising
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Sheave material
On Tue, 3 Feb 2009 20:35:39 -0500, "Garland Gray"
wrote: The idea of newsgroups is to share experience, I assume. In a way, that is what I was doing. Perhaps I'm fortunate to have a really good rigger that has given me a *lot* of incredibly good advice over the years. He sees hundreds of different boats and rigging issues every year, getting far more experience with such things than I ever will. He also has a direct pipeline to all of the engineering folks behind the different products that he services. |
#7
posted to rec.boats.cruising
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Sheave material
On Tue, 3 Feb 2009 20:35:39 -0500, "Garland Gray"
wrote: The idea of newsgroups is to share experience, I assume. In a way, that is what I was doing. Perhaps I'm fortunate to have a really good rigger that has given me a *lot* of incredibly good advice over the years. He sees hundreds of different boats and rigging issues every year, getting far more experience with such things than I ever will. He also has a direct pipeline to all of the engineering folks behind the different products that he services. |
#8
posted to rec.boats.cruising
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Sheave material
"Garland Gray" wrote in message ... Perhaps I didn't state that clearly. I place a high value on serious replies here. I wasn't complaining over just one response, or the quality of it. I'm not asking others to make my decision for me; but why try to reinvent the wheel ? The idea of newsgroups is to share experience, I assume. Well, FWIW Harken uses Delrin sheaves in most, if not all, of their midrange and smaller blocks, and at least many of their Big Boat range as well. I'm not sure if they use metal sheaves at all any more. I've used their blocks for the past fifteen years and have never had one fail on me. The delrin cheeks will discolor over time, going from black to dark grey, but it doesn't seem to harm them. I like Garhauer for their "all metal" policy, but I have bought quite a few Harkens over the years and have never regretted it. You can get them about anywhere there's boats, and there's a lot to be said for that convenience. |
#9
posted to rec.boats.cruising
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Sheave material
On Tue, 3 Feb 2009 22:15:06 -0600, "KLC Lewis"
wrote: I'm not asking others to make my decision for me; but why try to reinvent the wheel ? The idea of newsgroups is to share experience, I assume. Well, FWIW Harken uses Delrin sheaves in most, if not all, of their midrange and smaller blocks, and at least many of their Big Boat range as well. I'm not sure if they use metal sheaves at all any more. I've used their blocks for the past fifteen years and have never had one fail on me. The delrin cheeks will discolor over time, going from black to dark grey, but it doesn't seem to harm them. I like Garhauer for their "all metal" policy, but I have bought quite a few Harkens over the years and have never regretted it. You can get them about anywhere there's boats, and there's a lot to be said for that convenience. When I was racing on big boats (50+ ft) most of the sheets and guys had wire tails. With wire a metal sheave is absolutely necessary. |
#10
posted to rec.boats.cruising
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Sheave material
"Wayne.B" wrote in message ... When I was racing on big boats (50+ ft) most of the sheets and guys had wire tails. With wire a metal sheave is absolutely necessary. Wire tails on sheets have to be hard on the hands. But you're right, they'd destroy plastic in short order. |
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