Author Topic: powder coating problems  (Read 920 times)

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Offline Hush

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powder coating problems
« on: November 15, 2012, 09:08:43 PM »
We got some parts powder coated this week, all looked nice and shiny until I started to assemble the forks.
Inside was all gritty and sandy! :(
Is this normal?
Some of it I just can't seem to shift, looks like the interiors of the fork legs were sand blasted on the insides!
Just noticed that the wheels also now have some rather permanent looking bolts to attach the discs to, um is this normal also?
The steering triple looks great but the powder coating firm left the old weather seal on and it now will have to be cut off, I meant to remove it but my son took the parts away while I wasn't home.
Anyhow, what does the panel think on the fork legs? can I scour them out with something!
I think the thing I most like about motorcycling is the speed at which my brain must process information at to avoid the numb skulls who are eating pies, playing the ukulele, applying make-up etc in the comfort of their airconditioned armchairs as they make random attempts to kill me!!!!!!!

Markcb750

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Re: powder coating problems
« Reply #1 on: November 16, 2012, 02:53:07 AM »
On the insides of the fork legs I would try a cylinder hone on a drill.  Use some light oil or soapy water to remove material quickly.   

If it is sandblasting it may not be best to run the hone till the  inside surface is "perfect"  as the bore size may become too large to guide the fork tube bushing properly; then your only recourse is to make a custom oversize  bushing.

The painted over bolts are a common P-C process to keep the paint out of the threads.  just take them out with lock plyers on the head, they will not be tight.

You will also need to carefully sand/stone the mating surfaces under the bolt heads to provide a metal to metal bonding surface for the mating components.

Sounds like you P-C guy was careless, sucks but you now get to spend time nursing everything back into shape.

Mark


Offline Xnavylfr

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Re: powder coating problems
« Reply #2 on: November 16, 2012, 04:57:09 AM »
Sorry to say hard lesson learned!!   If you DON'T want it sandblasted/beadblasted make sure the PC company knows that and covers it( have it in WRITING on work order). If the surface of the metal is not near perfectly smooth then that is what your PC will look like!! Kinda like painting a gravel road, you have nice new paint but it still looks like a gravel road. Same goes with CHROME.
Most companies are more worried about VOLUME and TURN AROUND time.Less time prepping means they can do more #$%*ty jobs of PC.
This is like the old EARL SHIEB paint jobs, if you didn't want it painted then you better tape it off yourself.
I'd take the parts back TO THE BOSS and complain. You will have to COMPLETELY teardown your fork tubes to remove ALL the blast media because it will score and scratch the metering tubes causing the forks not to dampen like they should ( oil bypassing) instead of metering. It was their job to PREP before PC and I don't think they did.

Xnavylfr(CHUCK)