Myford super 7B Chuck threads

[JourneymanParticipant @journeyman]

Did a bit of "Googling" apparently they are carriers for a grinding machine but no reason why they couldn't be pressed into service as drive dogs on the lathe.

John

[Pete RimmerParticipant @peterimmer30576]

The 4-jaw chuck appears to have an adapter plate fitted. I'd remove that to reduce the overhang and fit a backplate directly to the chuck.

[roy entwistleParticipant @royentwistle24699]

Martin of Wick

By using this mount on the rotary table,you would be able to interchange the chuck, complete with job, between the lathe and the rotary table if you needed to

Roy

[GeorgineerParticipant @georgineer]

It's worth being aware that the late ML4 had the same thread as the ML7 but the register diameter was 1⅛ " not 1¼" , so face plates and such exist with the smaller register which would need boring out before fitting to a ML7. I know, I have one on the list of things to do…

Swarf, mostly, thanks for the tip about pinning the character map to the task bar. Done it!

George

[SteviegtrParticipant @steviegtr]

Many thanks for all the input received. Its Rufforth on Sat so going to look for a tap. Not that i'm stuck for the 4 jaw. Would just be nice for it to done ready.

[Harry WilkesParticipant @harrywilkes58467]

Posted by Steviegtr on 03/01/2020 14:42:33:

Many thanks for all the input received. Its Rufforth on Sat so going to look for a tap. Not that i'm stuck for the 4 jaw. Would just be nice for it to done ready.

Steviegtr please bear in mind Rod's comment about TPI and also you can purchase the correct tap foe around £10 online

H

[Howard LewisParticipant @howardlewis46836]

You will find a 4 Jaw extremely useful. With it you can centre work much more accurately than in a 3 jaw, offset it if you want to produce something with a known eccentricity. You will need a DTI or a Finger Clock for this, with a suitable base, (probably a magnetic one ). These will be useful for many other tasks, in the future, so a good investment.

If it were me, machining and fitting a Backplate for the 4 Jaw would be high on my list of priorities.

Howard

[norm nortonParticipant @normnorton75434]

Thank you for the fractions idea. But I am on a Mac and not a PC. If it helps others, I have discovered [ctrl][cmd][space] brings up a character map for the Mac and search 'fraction' (singular) gives a few.

Question is, do my two dimensions read correctly on other people's computers? 1⅛", 7½".

Norm

Edited By norm norton on 03/01/2020 15:53:51

[Howard LewisParticipant @howardlewis46836]

Good News, Norm. They do on W7

Howard

[OldironParticipant @oldiron]

& on W10

[SteviegtrParticipant @steviegtr]

They certainly look very professional ,much better than 1 1/8" . Oh & thanks again. 1 1/8" 12 tpi

[Howard LewisParticipant @howardlewis46836]

If you came across one, it is possible that a Backplate intended for a ML 1, 2, 3 or 4 may be able to be modified. The original M Series used 7/8 BSW (9 tpi ) thread and 7/8 register. Slightly later the 7/8 thread was changed to 12 tpi, and only the very late M series used what is now known to as the "Myford " thread of 1 1/8 x 12 tpi

The 1947 ML7 introduced the 1 1/8 x 12 tpi with 1 1/4 register, that we now take as the Myford Standard.

Lathes, using Mandrel bores larger than 2MT had to use use larger threads and registers, but Backplates for these can always be bushed with a Myford thread and register, and then machined to suit the chuck for which they are intended.

Howard

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