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Chuck backplate error

Whats the important bit?

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Michael Gilligan12/01/2021 23:08:43
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17279 forum posts
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Post #65 here might be of interest : **LINK**

https://www.practicalmachinist.com/vb/general/comparable-machine-schaublin-102n-vm-cf-291816/index4.html

MichaelG.

david bennett 826/01/2021 04:19:43
27 forum posts

Michael G, sorry to be so long responding. Those Schaublin nose specifications look interesting. Since the thread diameters are about 0.5mm larger than the register size, it looks like Schaublin doesn't belleve in close fitting backplate registers either.

Dave.

Michael Gilligan26/01/2021 08:11:40
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Posted by david bennett 8 on 26/01/2021 04:19:43:

[…]

the thread diameters are about 0.5mm larger than the register size […]

.

Are you sure about that, Dave ?

It’s not how I read the drawings

MichaelG.

.

858b6839-e48e-46d3-9c29-fc28971d38a6.jpeg

Sorry about the image size ... I grabbed it from the referenced discussion.

Edited By Michael Gilligan on 26/01/2021 08:17:11

Michael Gilligan26/01/2021 08:32:58
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17279 forum posts
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PostScript :

For a much better image ... See here: **LINK**

https://www.roesli-maschinen.ch/schaublin/masszeichnungen.pdf

[ isn’t the internet wonderful ! ]

MichaelG.

old mart26/01/2021 15:52:35
2659 forum posts
176 photos

It's that dimension at the far right hand side that is causing the confusion with both drawings. The thread sizes are definitely smaller than the registers.

Edited By old mart on 26/01/2021 15:53:09

david bennett 826/01/2021 15:57:02
27 forum posts

Hmm, what do you read the 38.453mm dimension as (on the w20 nose) ?

Dave.

Michael Gilligan26/01/2021 16:05:13
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17279 forum posts
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Posted by david bennett 8 on 26/01/2021 15:57:02:

Hmm, what do you read the 38.453mm dimension as (on the w20 nose) ?

Dave.

.

The dimension over the 1.8mm wires

... What do you read it as ?

MichaelG.

.

ab8d9d8d-b64a-455d-845b-7baeec9a0844.jpeg

.

Edited By Michael Gilligan on 26/01/2021 16:07:50

old mart26/01/2021 16:05:33
2659 forum posts
176 photos

I don't know what it is there for, but the thread size is M37.6 X 3, which is smaller than the register diameter, 37.97mm.

 Now I see, with the larger picture, it is the diameter over wires. All is crystal clear to me now, I hope it is also clear to everyone else.

Edited By old mart on 26/01/2021 16:07:33

david bennett 826/01/2021 16:12:01
27 forum posts

Ah, thanks for clarifying - I couldn't read that before . I was maybe hoping it was the elusive clearance!

Dave.

Michael Gilligan26/01/2021 16:12:02
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17279 forum posts
778 photos

Yes ... That’s why I added my PostScript

[ you can lead a horse to water, but ... ]

MichaelG.

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