Polishing cast iron

Polishing cast iron

This topic has 9 replies, 5 voices, and was last updated 8 January 2011 at 11:05 by Nicholas Farr.

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3 January 2011 at 12:19 #61676
Dismaldunc
Participant
@dismaldunc
Hi again folks, Well I have completed my stuart 10V as my first ever project and it runs! (ok it did take a replacement cylinder and 3 attempts at making the crankshaft) But although I am happy with the machined finish on the cast iron ( i did iddy-biddy tiny finishing cuts) It still looks dull, now piccys I’ve seen online are so shiny they look almost chrome plated.

How is this acheived ??? is it real or is it photo-shop ?

once again thanks in advance for your time

Duncan
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3 January 2011 at 12:19 #5342
Dismaldunc
Participant
@dismaldunc
3 January 2011 at 12:26 #61677
Nicholas Farr
Participant
@nicholasfarr14254
Hi Duncan, fine grade wet-n-dry will bring cast to a shine, and then finish with a metal polish.

Regards Nick.

Edited By Nicholas Farr on 03/01/2011 12:26:54
3 January 2011 at 12:56 #61678
Dismaldunc
Participant
@dismaldunc
blummin heck.. thanks Nick I though there would be some high tech trickery to this, right then, Where is that pre-war tin of brasso ?

Dunc
3 January 2011 at 13:27 #61679
JasonB
Moderator
@jasonb
Just work through finer abrasives, better to use oil with the Wet and dry than water but I find you don’t really need it wet.

Jason
4 January 2011 at 04:25 #61728
Ian S C
Participant
@iansc
And before you go inside from the workshop, wash your hands. The black leaves a mess everywear. ian S C
7 January 2011 at 20:02 #61953
Sub Mandrel
Participant
@submandrel
> 3 attempts at making the crankshaft

Is that all – I still manage to screw up crankshafts after several engines!!! Though I must confess I managed the cylinder first time!

Neil
7 January 2011 at 20:51 #61963
Dismaldunc
Participant
@dismaldunc
Hi Neil, Yup I was really miffed, bored out the cylinder spot on, faced the ends just loverly, drilled the exhust hole spot on plus one of the steam ways. Then managed to drill through into the correct place on the second steamway but gave it a bit more stright into the other port bummer !
8 January 2011 at 10:53 #61984
Ian S C
Participant
@iansc
Anothere thing you can polish with is toothpaste, have used it for polishing samples of steel and cast iron for study under the microscope. The stuff I’v got is those little tubes you get along with a brush on airlines–tastes awful. Ian S C
8 January 2011 at 11:05 #61986
Nicholas Farr
Participant
@nicholasfarr14254
Hi Ian, sounds logical, as I beleive one ingreedient of toothpaste is sand, milled into a fine powder.

Perhaps its the best use for your supply, being as it is in bad taste.

Regards Nick.
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