what bore finish?

what bore finish?

This topic has 3 replies, 3 voices, and was last updated 17 August 2013 at 20:06 by JasonB.

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17 August 2013 at 19:00 #127144
ken king, King Design
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@kenkingkingdesign
Lots of discussion going on in my other thread 'Honing vs Reaming', and I've finally got around to asking myself 'what surface finish is actually most desirable in the cylinders of a steam locomotive?' As I didn't have an answer I thought I'd throw the subject open to you all. An article from 1920 talks about a reamed finish 'like glass' and I assumed that is what I should be aiming for, but is it ? Isn't it likely to be influenced by piston seal material ? By means of lubrication, or lack of it , or other factors I haven't considered ?

Please give me the benefit of your experiences,

Thanks,

Ken.
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17 August 2013 at 19:00 #15654
ken king, King Design
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@kenkingkingdesign
Seeking the most desirable finish for steam
17 August 2013 at 19:43 #127148
Boiler Bri
Participant
@boilerbri
I try to finish my bores 3-4 though smaller than the finished size and then three stone hone them.

The finsh is usually good depending on the material. I can get the best finish on stainkless steel.

cheers

Brian

Edited By Boiler Bri on 17/08/2013 19:44:18
17 August 2013 at 20:06 #127152
JasonB
Moderator
@jasonb
Again its going to depend on material and packing/rings.

On CI cylinders with iron rings I use a two or three stone hone depending on dia.

If its bronze or CI and going to have graphite yarn, PTFE or O rings then I would lap the bores as honing is a bit abrasive.

In all cases bored to a though or two oversize.
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