M38 Carcano Lower Band Swivel STUD

[Salt Flat]

Hello fellow Carcano aficionados! I am stuck in the house with a bad case of gout so I thought I would use this time draw up a M38 Carcano Lower Band Swivel STUD. I made one awhile back and it came out OK but maybe not to perfect dimensioning. Another forum member has asked me about how to make one so I thought if anyone is interested in measuring an original we could come up with an accurate drawing and leave that as a post on the forum. If say a couple of people provide dimensions we can come up with some good numbers. I will then redraw to scale and leave as a post on the forum. This little part is always hard to find. So if you have a digital caliper and original stud handy please measure the Dim’s A thru N and post or send me the dimensions. I am not getting anything out of this other than being able to make a good part myself. Also I will later do a step by step with pictures on how to make one when my foot gets better. It looks more complicated than it is but helps to have a lathe and mill.
Salt Flat

Information

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[jmoore]

Will try and do some ciphering directly.

[Salt Flat]

Moderator Edit:

The drawing in this post has been deleted as it it is later superceded with an updated version.

[jmoore]

Did the measurements on one. Would that suffice or do you want more?

[Aragorn243]

You should go into the small part business. There is a definite shortage of parts. Notably the bolt head screws off of Lebel and Berthier rifles. Vetterli Carcano front bands also don't seem to exist.

[Salt Flat]

Jmoore, Yes, I would welcome more measurements. I eyeballed some of the drawing and I think it is close but would like to update the drawing with any input I get. Thx!

Aragorn, Yes, I think there is a market for these small parts. Wisner's in Washington makes a lot of small parts but not for milsurps. I personally don't feel the motivation to do it commercially but for the right peson it could work.

Thx, Salt Flat

[Salt Flat]

Jmoore, I re-read your post. I think neasurements form one part would be enough, Please send me the numbers and I will update. THX, Salt Flat

[jmoore]

Well, too late, I already started on another.

Partly because the first was a bit grungy and worn at the anti-rotation boss. Also because it's swivel hole (Index "B") goes all the way through. As does the next one. Additionally, now using a convertible digital caliper set that reads in metric and English units. Threads seem to be .8mm pitch or roughly 31tpi.

[jmoore]

Entry one (not quite complete vis. threads)
M38 cal. 7,35

A 0.193 thread OD
B Wire diameter: 0.141"
C 0.264-0.267"
D 0.532-0.538"
E 0.082-0.084"
F 0.277-0.285"
G D-F
H 0.477"
I
J ~0.070"
K 0.262"
L 0.120-0.123"
M
N 0.046"

Transition radius from lug to outer face "E" 0.030-0.050" (Much smaller on the next sample forthcoming.)

Might I suggest either the innermost face or, preferably, the inner face of dimension "E" be the primary longitudinal datum? Dia "C" seems a good primary radial datum.

[jmoore]

M38 6,5 cal.

A 0.192 .8mm thread pitch
B 0.144" wire diameter, through hole
C 0.260-0.264"
D 0.528"
E 0.078-0.083"
F 0.272"
G D-F
H 0.461-0.467"
I
J 0.090"
K 0.278"
L 0.095"
M
N 0.050"

Transition radius: 0.032" both sides

Subject to correction for lousy typing skills, bad handwriting, haste, and general stupidity.