Gallery, Projects and General > How do I??
Leveling Denford lathe - has no levelling screws?
DavidA:
Phil,
Yes, I remember well the last discussion we had.
My point is that you are starting out with a built in error, no matter how small.
If you are bolting something to the dished faceplate, then either the job has to bend or the faceplate does until the faces touch. A fifteen thou dip in the middle of a 12" plate really is a lot.
I just can't see the doing in doing it.
Each to his own; of course.
Dave.
philf:
Hi David,
It's not 15 thou - it's 0.015mm - just over 1/2 a thou.
It's incredibly difficult and therefore very expensive to get it exactly right. Convex is an absolute no-no because you'd never get a flat object bigger than the radius to sit in a stable position.
With your 1/2" thick bar the out of squareness would be a maximum of around 0.0004mm.
Phil.
Pete.:
You could easily scrape a faceplate flat or with a much smaller dish than quoted above.
Bear in mind that a 300mm faceplate probably runs out more than the quoted figure above and will almost certainly distort more when you clamp an irregular shaped object to it.
DavidA:
Phil,
You're right. My apologies for that. I'm used to equating three places of decimals to Imperial. I didn't take into account the 300 mm next to it.
Dave
Alan Haisley:
--- Quote from: Pete. on December 20, 2015, 05:14:22 AM ---You could easily scrape a faceplate flat or with a much smaller dish than quoted above.
Bear in mind that a 300mm faceplate probably runs out more than the quoted figure above and will almost certainly distort more when you clamp an irregular shaped object to it.
--- End quote ---
True, but the concern is what a lathe will do in facing off a piece of work. It could be a faceplate or it could be a surface of a properly held piece. The idea is that since we can't get the lathe to machine perfectly flat we may as well go for a slight concave which provides a more useful surface.
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