New posts

Flex Hone Seat Tube?

April 15, 2013, 11:06 a.m.
Posts: 1131
Joined: Sept. 30, 2006

Anyone know of any Vancouver/North Van shops that will hone a seat tube for me? Specifically, has anyone had it done anywhere, and were pleased with the results?
I am building up a new frame, and there are a few welding burrs in the seat tube that need to be knocked off so I can insert the seat post fully. I have tried sanding it / attempting to get a file on it, but the burrs are a bit too far down to get a good shot at.

Thanks in advance!

April 15, 2013, 12:36 p.m.
Posts: 3715
Joined: March 6, 2003

Just use a brake hone.

I used one on a frame that was 30.0mm and after many hours of grinding I had a 30.9mm seat tube.

If all you are doing is knocking off a few weld burs you should be fine.

:canada: My Riding Journal….www.FVMBA.com :england:
"Do you even build?"
-DW-
"If everything seems in control, you're not going fast enough."
-Mario Andretti-

April 15, 2013, 1:04 p.m.
Posts: 1131
Joined: Sept. 30, 2006

Just use a brake hone.

I used one on a frame that was 30.0mm and after many hours of grinding I had a 30.9mm seat tube.

If all you are doing is knocking off a few weld burs you should be fine.

This is one of those cases where I'd prefer to use the right tool for the job. A brake hone probably works in theory, but if something goes wrong, those stones would really mess up my seat tube. Even a firm brass or wire brush might do the trick. I dont want to remove any more material than just the burrs.

April 15, 2013, 1:31 p.m.
Posts: 8256
Joined: Nov. 21, 2002

I just had it done at Cove, I think it was $25. Get the wheels and bars on so they have something to hold onto.

WTB Frequency i23 rim, 650b NEW - $40

April 15, 2013, 2:49 p.m.
Posts: 5738
Joined: May 28, 2005

they have a set at ocb, if you ask nice and look dyke-y enough, they'd probably let you do it yourself ;)

"Nobody really gives a shit that you don't like the thing that you have no firsthand experience with." Dave

April 15, 2013, 2:56 p.m.
Posts: 2
Joined: May 28, 2012

Obsession Bikes has a flex hone.

April 15, 2013, 6:06 p.m.
Posts: 0
Joined: Aug. 12, 2007

I think pretty well every shop on the planet has a flex hone. They are never very good at getting significant imperfections out unless you have a spare three hours… I haven't seen a proper seat tube reamer for years, but I'd probably try and track one down if the seat tube is bad enough.

treezz
wow you are a ass

April 15, 2013, 7:30 p.m.
Posts: 1131
Joined: Sept. 30, 2006

I think pretty well every shop on the planet has a flex hone. They are never very good at getting significant imperfections out unless you have a spare three hours… I haven't seen a proper seat tube reamer for years, but I'd probably try and track one down if the seat tube is bad enough.

I dont think these ones are too bad. Does MEC have one? How much do they charge to give it a shot? I dont want to go crazy on the inside of the tube, I am hoping a good few strokes with the hone will sort it out.

April 15, 2013, 8:05 p.m.
Posts: 8
Joined: Aug. 20, 2010

or, throw that seat post on a lathe and skinny it down a bit!

April 15, 2013, 8:57 p.m.
Posts: 2116
Joined: Aug. 4, 2009

Or get a junk seat tube the same size and use it to smash the burrs off.

April 15, 2013, 9:20 p.m.
Posts: 1131
Joined: Sept. 30, 2006

Or get a junk seat tube the same size and use it to smash the burrs off.

I thought of that, but I only JUST got the right sized tube this past weekend at the gear swap. Was running a shimmed 27.2 before, and it had no problems with the burrs. As soon as I put in the 30.9mm, it hits about half-way down :(

April 16, 2013, 11:56 a.m.
Posts: 10077
Joined: Nov. 19, 2002

I'd check with frame builders like Chris DeKerf or Mike Truelove. I'm sure there are others in Metro Van that would have the seat tube ream.

April 16, 2013, 12:53 p.m.
Posts: 8935
Joined: Dec. 23, 2005

Do you own a drill?

Take a piece or dowelling that you can chuck in your drill, make sure it's long enough to reach down into where the burr is. Slot the end of the dowelling to fit some emery cloth. Put a zip tie on the bottom of your slot to hold the emery cloth in.

I can't find better pictures, but frame builders frequently use a ghetto too like this to clean the inside of tubes and lugs to prep then for brazing/welding.

April 16, 2013, 1:18 p.m.
Posts: 1131
Joined: Sept. 30, 2006

The drill/dowel/sandpaper trick isnt a bad idea. Im guessing it wont have enough gusto to remove the burrs, but worth a shot perhaps. Thanks!

April 16, 2013, 2:25 p.m.
Posts: 8935
Joined: Dec. 23, 2005

If that won't remove the burs you have some serious issues.

What frame is it? Did someone completely screw up the factory reaming? Or miss the factory reaming completely?

It's standard practice to ream a frame after welding. The heat from welding distorts the tube a bit and reaming is the fix.

Forum jump: