First mini lathe project, oscillating steam engine.

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doubleboost:
Hi
Ross
You need to remove the tube.
Use some packing pieces to protect the job (i use bits of aluminium plate.
If you have a clock gauge it will make set up much easier.
What i do is put a spare lathe centre in between the punch mark and the tail stock centre.
A clock gauge is placed on the spare centre near the chuck .as the job is rotated (by hand)the spare centre will wobble about the chuck is adjusted until it remains stationary.
Sounds complicated but is really easy to do , you can get it to run dead true by this method.
I have been looking for a picture of the set up
If no one posts a picture for you i will do a video (worth a thousand words)
John

doubleboost:
Yhis shows how to do it
If it is good enough for Rob it must be good

John

Ross:

--- Quote from: doubleboost on February 16, 2012, 05:39:51 PM ---Hi
Ross
You need to remove the tube.
Use some packing pieces to protect the job (i use bits of aluminium plate.
If you have a clock gauge it will make set up much easier.
What i do is put a spare lathe centre in between the punch mark and the tail stock centre.
A clock gauge is placed on the spare centre near the chuck .as the job is rotated (by hand)the spare centre will wobble about the chuck is adjusted until it remains stationary.
Sounds complicated but is really easy to do , you can get it to run dead true by this method.
I have been looking for a picture of the set up
If no one posts a picture for you i will do a video (worth a thousand words)
John

--- End quote ---

That's a great tip. Thanks for the video link too, I'll give it a go later.

Ross:
Hi everyone,

I set up the square block in the lathe, it took a while to get it perfect but it was satisfying once I'd got it right.

First I centre drilled, then I started with a small drill bit and worked my way up.

I drill the hole to 11mm. Though I'm not sure about the best way to finish it. The final diameter for the bore is 12.5mm do I ream the bore or can I use a boring bar to achieve a good finish?

That all for now.

Divided he ad:
Hi Ross... A few links that may help you get it finished straight?

Boring does work but often leaves a surface in need of lapping.

Else you could have a go at D bits and then a little amount of lapping may be required?

If you have the need to smooth things out a little afterwards?
http://madmodder.net/index.php?topic=591.0

If you have the means to make them?
http://madmodder.net/index.php?topic=2312.msg24257#msg24257

http://madmodder.net/index.php?topic=1334.msg11778#msg11778

Hope that helps in some way? Good luck :thumbup:

Ralph.

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