Boring Bar Holder

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Ajohnw on 15/03/2016 15:39:33:

… but the image looks like everything has been removed.

.

That's the [confusing] headline image … The ones in Downie's article are quite different.

MichaelG.

[AjohnwParticipant @ajohnw51620]

Posted by Michael Gilligan on 15/03/2016 15:51:41:

Posted by Ajohnw on 15/03/2016 15:39:33:

… but the image looks like everything has been removed.

.

That's the [confusing] headline image … The ones in Downie's article are quite different.

MichaelG.

Being me I thought crack pot way having looked at the image and did notice the original article mounted it on the compound.

John

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[Neil WyattModerator @neilwyatt]

Posted by Ajohnw on 15/03/2016 15:39:33:

Then comes some mini lathes and others where the way the compound slide is mounted causes it to carry tensile loads in what people would regard as the normal position for the slide. Shear idiocy really but given sensible sizes still very stiff but no where near a stiff as a correctly designed one would be.

Can you explain?

The compound slide mounting on a 'standard' mini-lathe is one of the most solid I've seen in a small lathe. I can't see any way it's inferior to that on the ML7 or S7.

Or do you mean 'some small lathes' – 'mini-lathe' has taken on a very specific meaning these days.

Neil

[AjohnwParticipant @ajohnw51620]

Oh yes I can Neil complete with a photo

It's BAD design with a capitol B and has been used on several sizes. Not that it causes too much of a problem in this case but it may well in other areas of the cross slide when turning the full swing with any degree of grunt being applied by the tool.

John

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[Neil WyattModerator @neilwyatt]

Ah, but that's not a mini-lathe as most people know it!

In a true mini-lathe the base of the top/cross slide is ground flat and bears on the ground upper surface if the cross slide. The only PITA is having to wind it right back to adjust it.

Neil

[Anonymous]

I actually made a similar boring bar holder for my first lathe, a Logan. It must have been to an earlier design as I'm sure I made it before 1973, and the Logan didn't have a T-slotted cross slide. So the holder must have fitted in the T-slot on the topslide. I don't remember actually using it, and I've no idea where it is now, or even if I've still got it.

Andrew

[Author]

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