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PostPosted: Fri Sep 27, 2013 12:47 pm 
rBoTM Winner
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Joined: Tue Apr 25, 2006 12:06 pm
Posts: 1443
Location: Vienna, Austria
Just thought I'd share this. I'm sure I'm not the first to do it but here's a pretty effective way to remove zig-zagging from seatposts.

Here is an old Campagnolo Nuovo Record post which has what I would call mild zig-zagging all the way up it's shaft. I fix the tube to the end of my drill via some gaffer tape I've bound around a large drill bit, enough to hold the post reasonably tightly. Then spin through the normal stages of wet-n-dry paper. For this I used 250, 500, 800 then 1200. I find it best not to put drill on fast speed as you might chew away more than you need to. Obviously you'll loose that fine Campagnolo machined 'striping' but in most cases you can achieve a very presentable finish. Also, if your zig-zagging is deep then it's probably best not to do this as you'll loose some width & possibly some engraved text.

Before

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Tape round drill bit

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Post affixed

Image

During

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End result

Image

Image


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PostPosted: Fri Sep 27, 2013 3:00 pm 
Gold Trader
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Joined: Mon Jan 15, 2007 11:40 am
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nice result!


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PostPosted: Fri Sep 27, 2013 4:01 pm 
rBoTM Winner
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Location: California
That looks great.


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PostPosted: Fri Sep 27, 2013 5:03 pm 
Old School Grand Master
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Joined: Fri Oct 14, 2011 8:41 pm
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Location: Cumbria
Nice :)

Mind now playing the music from that scene with Demi Moore and Patrack Swayze in "Ghost"...........

Shaun


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PostPosted: Fri Sep 27, 2013 8:31 pm 
Retro Guru

Joined: Tue Jun 07, 2011 10:00 pm
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Location: Ely. UK
top stuff :D


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PostPosted: Fri Sep 27, 2013 8:47 pm 
rBoTM Winner
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Location: Mansfield Woodhouse, Nott's.
Be very wise when attempting this! Do not go mad and STOP as soon as you see the marks disappear.

Don't just keep the drill going and doing the sanding but keep stopping and checking - stopping and checking :wink:

If the zig-zag marks are deep and you remove the marks you narrow the diameter of the seat post
so a 27.2mm post could go as 27mm and when you fit it back in the frame you will have to tighten
the seat clamp bolt even more, thus stressing the brazed on bolt clamp, I've seen seat posts slide
down the seat tube even though the bolt was fully tightened and the worst seen was a broken clamp :(


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PostPosted: Sat Sep 28, 2013 3:30 pm 
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Joined: Tue Jun 03, 2008 4:31 pm
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Tape the bit you want in the frame. Don't polish that bit.


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PostPosted: Sat Sep 28, 2013 4:53 pm 
Retro Guru
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Joined: Fri Feb 03, 2012 6:36 am
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Location: Northwest USA
Excellent tip which I used last night with success.

The post I was working with was black originally but looked terrible, scratched with deep zig-zagging. Much better now, still has the z-z's but looks so much better.

Thanks for posting!


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PostPosted: Sat Sep 28, 2013 5:33 pm 
rBoTM Winner
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Joined: Tue Apr 25, 2006 12:06 pm
Posts: 1443
Location: Vienna, Austria
Mr.Toad wrote:
Excellent tip which I used last night with success.

The post I was working with was black originally but looked terrible, scratched with deep zig-zagging. Much better now, still has the z-z's but looks so much better.

Thanks for posting!


Oh superb, that's made my day.


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