Threaded Norman Toolpost

[John BaronParticipant @johnbaron31275]

Hi Michael,

Unfortunately not ! I did find the original info on line quite some time ago, but I've been through a couple of hard drives since then and my backups are not all that they should be. Over time I've lost a lot of information that I can no longer find on line.

Have you looked at the USA patents office ? I think you can search it by both name and date. The earliest reference I could find was some time in the late 1880's. But I'm blessed if I can remember exactly.

[Michael GilliganParticipant @michaelgilligan61133]

Thanks for the reply, John

I tend to use espacenet, which has good worldwide coverage and quite flexible search criteria … but I can try on uspto.

Several tool-holding patents are available, around that date, in the name of Van Norman, but I have yet to find the one for this elegantly simple design. … Perhaps it is hidden within one of the others, as an alernative 'embodiment'.

[or perhaps I was just having a bad day]

MichaelG.

[John BaronParticipant @johnbaron31275]

Posted by Michael Gilligan on 11/08/2019 07:03:24:

Thanks for the reply, John

I tend to use espacenet, which has good worldwide coverage and quite flexible search criteria … but I can try on uspto.

Several tool-holding patents are available, around that date, in the name of Van Norman, but I have yet to find the one for this elegantly simple design. … Perhaps it is hidden within one of the others, as an alernative 'embodiment'.

[or perhaps I was just having a bad day]

MichaelG.

Hi Michael,

I do recall that was how I discovered about "Van Norman" Lathes.

I must admit to not being able to rediscover it. If you do come across it, please let me know.

[Howard LewisParticipant @howardlewis46836]

The clamping arrangement of the split sleeve machined to the radius of the parent bore is so good, that it will be included in a project that i have in mind.

Presumably, the same van Norman as the company that produced the greatly respected boring bars for engine cylinders?

Howard

[Michael GilliganParticipant @michaelgilligan61133]

Posted by John Baron on 11/08/2019 12:32:54:

[ … ]

I must admit to not being able to rediscover it. If you do come across it, please let me know.

.

This looks a promising list, John **LINK**

http://vintagemachinery.org/mfgIndex/detail.aspx?id=2109&tab=7

MichaelG.

[David Davies 8Participant @daviddavies8]

Hi,

for what it's worth the clamping mechanism is described by GHT in his book 'Dividing and graduating', page 59 in my copy. It is used to clamp the spindle of his Versatile Dividing Head.

Dave

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