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#11
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Finally shifted the seized seat post.
On Mon, 09 Oct 2017 15:08:12 -0500, AMuzi wrote:
On 10/9/2017 1:37 PM, Doug Landau wrote: On Sunday, October 8, 2017 at 12:56:21 PM UTC-7, Ian Field wrote: had to replace the saddle, so I put a few dabs of flour-emery powder on the seat clamp. There was enough grip that I could get hold of the saddle and twist the post out. Now re assembled with copper slip anti seize compound. Nice! But copper? For a seat post, molybdenum base or copper base paste are fine. The high temp aspect of copper is irrelevant but if that's the can he has then that's the can he should use. I understand the reason for lubing a seat post to be preventing dissimilar metals such as aluminium post and steel frame tubes from coming into contact and galling together. Does galvanic corrosion of the aluminium with the copper element not cause problems? -- davethedave |
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#12
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Finally shifted the seized seat post.
On Wed, 11 Oct 2017 07:31:06 -0000 (UTC), dave
wrote: On Mon, 09 Oct 2017 15:08:12 -0500, AMuzi wrote: On 10/9/2017 1:37 PM, Doug Landau wrote: On Sunday, October 8, 2017 at 12:56:21 PM UTC-7, Ian Field wrote: had to replace the saddle, so I put a few dabs of flour-emery powder on the seat clamp. There was enough grip that I could get hold of the saddle and twist the post out. Now re assembled with copper slip anti seize compound. Nice! But copper? For a seat post, molybdenum base or copper base paste are fine. The high temp aspect of copper is irrelevant but if that's the can he has then that's the can he should use. I understand the reason for lubing a seat post to be preventing dissimilar metals such as aluminium post and steel frame tubes from coming into contact and galling together. Does galvanic corrosion of the aluminium with the copper element not cause problems? It might. On the other hand most anti-seize mixes contain oil or grease that probably insulate the copper particles from the aluminum post or prevent the access of an electrolyte (water). -- Cheers, John B. |
#13
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Finally shifted the seized seat post.
On Wednesday, October 11, 2017 at 12:31:09 AM UTC-7, davethedave wrote:
On Mon, 09 Oct 2017 15:08:12 -0500, AMuzi wrote: On 10/9/2017 1:37 PM, Doug Landau wrote: On Sunday, October 8, 2017 at 12:56:21 PM UTC-7, Ian Field wrote: had to replace the saddle, so I put a few dabs of flour-emery powder on the seat clamp. There was enough grip that I could get hold of the saddle and twist the post out. Now re assembled with copper slip anti seize compound. Nice! But copper? For a seat post, molybdenum base or copper base paste are fine. The high temp aspect of copper is irrelevant but if that's the can he has then that's the can he should use. I understand the reason for lubing a seat post to be preventing dissimilar metals such as aluminium post and steel frame tubes from coming into contact and galling together. Does galvanic corrosion of the aluminium with the copper element not cause problems? By the best mechanic I ever new I was taught that you NEVER put lube on a seat post because it would cause it to slip at the tightest you could get it.. Having tried it I found him as usual to be completely correct. So I prevent problems by removing the aluminum post on the yearly service and making sure that everything is clean. |
#14
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Finally shifted the seized seat post.
On 10/11/2017 2:31 AM, dave wrote:
On Mon, 09 Oct 2017 15:08:12 -0500, AMuzi wrote: On 10/9/2017 1:37 PM, Doug Landau wrote: On Sunday, October 8, 2017 at 12:56:21 PM UTC-7, Ian Field wrote: had to replace the saddle, so I put a few dabs of flour-emery powder on the seat clamp. There was enough grip that I could get hold of the saddle and twist the post out. Now re assembled with copper slip anti seize compound. Nice! But copper? For a seat post, molybdenum base or copper base paste are fine. The high temp aspect of copper is irrelevant but if that's the can he has then that's the can he should use. I understand the reason for lubing a seat post to be preventing dissimilar metals such as aluminium post and steel frame tubes from coming into contact and galling together. Does galvanic corrosion of the aluminium with the copper element not cause problems? I can't speak to the chemistry of it but in practice both molybdenum and copper based antiseize pastes work well for seatposts and similar bicycle applications. For auto exhaust systems, I use copper. http://www.antiseize.com/Anti-Seize-Compounds -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#15
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Finally shifted the seized seat post.
On 10/10/17 22:56, Ian Field wrote:
"Doug Landau" wrote in message ... had to replace the saddle, so I put a few dabs of flour-emery powder on the seat clamp. There was enough grip that I could get hold of the saddle and twist the post out. Now re assembled with copper slip anti seize compound. Nice!Â*Â* But copper? Copper based anti-seize paste is what they have on the shelves round here. I have a tub of something based on a silvery colour metal, but I generally buy more Copperslip when it gets used up. molybdenum is a "friction modifier" - I had to do the clamp bolt up seriously tight with just the copper stuff on it. This reply does not address the validity - or lack thereof - of the alleged theory of operation of anti-sieze compounds, which says that the metal used therein should match the metal which is having a corrosion problem, so as to be taken up by the reaction and thus spare or partially spare the coated part. Translation please................... Yer grease goes manky not yer seat post. |
#16
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Finally shifted the seized seat post.
"dave" wrote in message news On Mon, 09 Oct 2017 15:08:12 -0500, AMuzi wrote: On 10/9/2017 1:37 PM, Doug Landau wrote: On Sunday, October 8, 2017 at 12:56:21 PM UTC-7, Ian Field wrote: had to replace the saddle, so I put a few dabs of flour-emery powder on the seat clamp. There was enough grip that I could get hold of the saddle and twist the post out. Now re assembled with copper slip anti seize compound. Nice! But copper? For a seat post, molybdenum base or copper base paste are fine. The high temp aspect of copper is irrelevant but if that's the can he has then that's the can he should use. I understand the reason for lubing a seat post to be preventing dissimilar metals such as aluminium post and steel frame tubes from coming into contact and galling together. Does galvanic corrosion of the aluminium with the copper element not cause problems? No idea - i haven't got an aluminium seat post. |
#17
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Finally shifted the seized seat post.
"AMuzi" wrote in message news On 10/11/2017 2:31 AM, dave wrote: On Mon, 09 Oct 2017 15:08:12 -0500, AMuzi wrote: On 10/9/2017 1:37 PM, Doug Landau wrote: On Sunday, October 8, 2017 at 12:56:21 PM UTC-7, Ian Field wrote: had to replace the saddle, so I put a few dabs of flour-emery powder on the seat clamp. There was enough grip that I could get hold of the saddle and twist the post out. Now re assembled with copper slip anti seize compound. Nice! But copper? For a seat post, molybdenum base or copper base paste are fine. The high temp aspect of copper is irrelevant but if that's the can he has then that's the can he should use. I understand the reason for lubing a seat post to be preventing dissimilar metals such as aluminium post and steel frame tubes from coming into contact and galling together. Does galvanic corrosion of the aluminium with the copper element not cause problems? I can't speak to the chemistry of it but in practice both molybdenum and copper based antiseize pastes work well for seatposts and similar bicycle applications. For auto exhaust systems, I use copper. my first tin of coppaslip after not having any for a while, was for fitting a new motorcycle exhaust system - but it works very well for all sorts of things on a bicycle. Generally speaking; any corroded part that gives me trouble dismantling it - gets Coppaslip in the way back. The local bicycle shop *ADVISED* me to Coppaslip the threads on the type of sprocket cassette that unscrews as a unit. |
#18
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Finally shifted the seized seat post.
"Tosspot" wrote in message ... On 10/10/17 22:56, Ian Field wrote: "Doug Landau" wrote in message ... had to replace the saddle, so I put a few dabs of flour-emery powder on the seat clamp. There was enough grip that I could get hold of the saddle and twist the post out. Now re assembled with copper slip anti seize compound. Nice! But copper? Copper based anti-seize paste is what they have on the shelves round here. I have a tub of something based on a silvery colour metal, but I generally buy more Copperslip when it gets used up. molybdenum is a "friction modifier" - I had to do the clamp bolt up seriously tight with just the copper stuff on it. This reply does not address the validity - or lack thereof - of the alleged theory of operation of anti-sieze compounds, which says that the metal used therein should match the metal which is having a corrosion problem, so as to be taken up by the reaction and thus spare or partially spare the coated part. Translation please................... Yer grease goes manky not yer seat post. Hardened old grease wouldn't been as difficult as the corrosion on the frame I rescued from a hedge. Marine grade prop shaft grease would beat the weather - but Coppaslip is easier to get this far from a coast. |
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