Wildgoose Chase Moto Guzzi

General Category => General Discussion => Topic started by: Canuck750 on July 02, 2022, 07:24:36 PM

Title: Rainy Day polishing project
Post by: Canuck750 on July 02, 2022, 07:24:36 PM
Rain all day, a good opportunity to clean up some aluminum engine side covers.

I gave the side covers a light cleaning on the vapour blast cabinet, juts to reveal the overall surface condition, not necessary but it helps to see the surface clearly.

Typical condition of 50+ years old aluminum, some deep scratches and gouges, plenty of pits

(https://i.postimg.cc/Cdy17Vg3/8021-A63-D-11-D6-4-FE9-8042-0-CD4223-F5-D1-F.jpg) (https://postimg.cc/p5ZRV4yC)

I start with 220 grit dry paper in a foam pad random orbital sander, keeping the sander moving all the time and sanding until the damage starts to disappear

(https://i.postimg.cc/8Cnrv97S/57-B276-F8-97-CE-401-C-B4-CA-A528-FC876-D7-E.jpg) (https://postimg.cc/CZk1TvCP)

Initial sanding shows the depth of the damage, if the casting is thick enough I try and sand all the gouges out, its not always possible

(https://i.postimg.cc/pTh5JCjn/01-C00-CCE-6256-4-B94-BEF7-3-EE656-B5-A0-AB.jpg) (https://postimg.cc/gXp0YvNY)

almost there

(https://i.postimg.cc/j5pwgf63/016-D8-AAF-B0-B5-40-C5-A64-F-AA8286-DFCE62.jpg) (https://postimg.cc/vgvZDcN5)

then wet sand with 400 wet/dry on a foam block until the surfaces are rounded and the scratches are removed, then finish with 1000 wet/dry, I go over the surface with the vapour blaster but again its not an absolute requirement, the vapour honing process just further smooths the surface

(https://i.postimg.cc/0jKj7yLG/58372422-8-E96-4163-B390-0154-A26-D0-ADE.jpg) (https://postimg.cc/SYqmhkQj)

Then a polishing on the buffer wheel with white polishing stick and finish with a hand rub down with 'Autosol' metal polish

(https://i.postimg.cc/63wfHD9G/56329149-6-FF0-4013-9-A0-B-91-D60556-BFB8.jpg) (https://postimg.cc/yJQRxp3V)

A comparison to another piece, the more I sand the surface with ever finer wet/dry the better the finish, this will do for what I am building

(https://i.postimg.cc/rFvWnvjF/3-D169778-19-E1-4607-A12-D-8-D20-FDD95-BB1.jpg) (https://postimg.cc/D8P8mpRt)

Its messy and time consuming but easy to do and the results are satisfying

(https://i.postimg.cc/Sx6XZjjD/E33358-EA-37-DC-4034-A735-98-A44-F0-EBC53.jpg) (https://postimg.cc/87CPcpR6)
Title: Re: Rainy Day polishing project
Post by: SIR REAL ED on July 02, 2022, 07:31:12 PM
very cool.  thanks.
Title: Re: Rainy Day polishing project
Post by: kballowe on July 02, 2022, 07:50:42 PM
DANG !

Good job !

 :thumb:
Title: Re: Rainy Day polishing project
Post by: flower_king001 on July 03, 2022, 06:09:38 AM
Well done!
Title: Re: Rainy Day polishing project
Post by: s1120 on July 03, 2022, 06:13:44 AM
Looks cool!  I like the idea of that second vapor blast. After sanding its really hard for the eyes to catch imperfections sometimes because it follows the sanding scratches. Taking them away lets you see what you missed better.
Title: Re: Rainy Day polishing project
Post by: cliffrod on July 03, 2022, 07:16:58 AM
Looks cool!  I like the idea of that second vapor blast. After sanding its really hard for the eyes to catch imperfections sometimes because it follows the sanding scratches. Taking them away lets you see what you missed better.

For those of us mere mortals who had yet to acquire a vapor honing capacity in our shop, you can do an aggressive (nozzle held closer to the piece around those imperfections) soda blasting as a second blasting to blend those residual scratching & imperfections.   The soda will not cut much, but it will help knock off edges of damage without having to lower the entire surface.

Nice thread, Jim.  I like seeing parts that aren’t over restored- very cool.
Title: Re: Rainy Day polishing project
Post by: chuck peterson on July 03, 2022, 04:00:22 PM
Did you say “this will do..”? Looks fantastic to me!
Title: Re: Rainy Day polishing project
Post by: moto-uno on July 03, 2022, 08:04:09 PM
  Your rainy days look to be awful long (Nice Job) :thumb: ! Peter
Title: Re: Rainy Day polishing project
Post by: Canuck750 on July 03, 2022, 09:08:59 PM
  Your rainy days look to be awful long (Nice Job) :thumb: ! Peter

Thanks Peter, it took about three hours start to finish for two engine side covers.
Title: Re: Rainy Day polishing project
Post by: LowRyter on July 05, 2022, 06:06:04 PM
 :thumb:
Title: Re: Rainy Day polishing project
Post by: LowRyter on July 05, 2022, 06:09:39 PM
 :thumb: