On Monday 08 February 2016 14:21:35 Ed wrote:
> Rifled Breech Loader
Thanks Ed. Educational reading to be sure.
Cheers, Gene Heskett
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On 02/08/2016 01:56 PM, Nicklas Karlsson wrote:
Screwed breeches of the Welin or de Bange type are only used with
bagged charge guns. They both use a de Bange obturator for sealing
whereas a brass-case gun used the case for obturation.
This might mean they need no lead, but the
> >> Screwed breeches of the Welin or de Bange type are only used with
> >> bagged charge guns. They both use a de Bange obturator for sealing
> >> whereas a brass-case gun used the case for obturation.
> >> This might mean they need no lead, but the pictures seem to indicate
> >> one.
>
> Krupp s
On 02/08/2016 11:14 AM, Gene Heskett wrote:
> On Monday 08 February 2016 11:23:58 andy pugh wrote:
>
>> On 8 February 2016 at 16:12, Gene Heskett wrote:
>>> One question remains: Does the thread even have to have a spiral
>>> component, eg does it need to actually advance into the hole as it
>>>
On Monday 08 February 2016 11:23:58 andy pugh wrote:
> On 8 February 2016 at 16:12, Gene Heskett wrote:
> > One question remains: Does the thread even have to have a spiral
> > component, eg does it need to actually advance into the hole as it
> > turns? Common sense says it should, in order to
On 8 February 2016 at 16:12, Gene Heskett wrote:
>
> One question remains: Does the thread even have to have a spiral
> component, eg does it need to actually advance into the hole as it
> turns? Common sense says it should, in order to achieve a gas tight
> seal against a shoulder at the bottom
On Monday 08 February 2016 08:39:10 Marcus Bowman wrote:
> On 8 Feb 2016, at 12:49, Peter Blodow wrote:
> > In other words, you pretend to cut a left-hand thread but have the
> > machine run in reverse so it turns out right hand?
> > Peter Blodow
>
> Yes; kind of I prefer to think of it as cut
On 8 Feb 2016, at 12:49, Peter Blodow wrote:
> In other words, you pretend to cut a left-hand thread but have the
> machine run in reverse so it turns out right hand?
> Peter Blodow
>
Yes; kind of I prefer to think of it as cutting a right hand thread upside
down (or is that inside out?).
In other words, you pretend to cut a left-hand thread but have the
machine run in reverse so it turns out right hand?
Peter Blodow
Am 08.02.2016 11:42, schrieb Marcus Bowman:
> On 8 Feb 2016, at 10:04, andy pugh wrote:
>
>> On 7 February 2016 at 23:37, Marcus Bowman
>> wrote:
>>
>>> Easy. mount
On Feb 8, 2016 5:02 AM, "andy pugh" wrote:
>
> On 8 February 2016 at 10:42, Marcus Bowman
> wrote:
> > For an internal right-hand thread, the problem is often that the tool
feeds into the hole from the right, and bumps into the bottom of the hole.
It would be the same for an external thread bumpi
When I worked in the shipyard we cut the gun mounts with pretty
conventional home made boring bars made out of H beams and other stuff
with a star wheel on the outside that hit a stob welded to the wall to
increment the tool out. It was turned by a gear motor attached to the
ceiling. Took about
On 8 February 2016 at 10:42, Marcus Bowman
wrote:
> For an internal right-hand thread, the problem is often that the tool feeds
> into the hole from the right, and bumps into the bottom of the hole. It would
> be the same for an external thread bumping into a shoulder on the left.
Ah, OK. That
On 8 Feb 2016, at 10:04, andy pugh wrote:
> On 7 February 2016 at 23:37, Marcus Bowman
> wrote:
>
>> Easy. mount the tool upside down, and start at the blind bottom.
>
> Sorry, I am not quite understanding your description?
>
Yes; apologies; my rather quick response was a bit cryptic...
For
On 7 February 2016 at 23:37, Marcus Bowman
wrote:
> Easy. mount the tool upside down, and start at the blind bottom.
Sorry, I am not quite understanding your description?
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atp
If you can't fix it, you don't own it.
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> From: John Kasunich [mailto:jmkasun...@fastmail.fm]
>> Sent: Sunday, February 07, 2016 4:47 PM
>> To: emc-users@lists.sourceforge.net
>> Subject: Re: [Emc-users] Any idea how they machine these?
>>
>> A post on this page:
>> http://yarchive.net/metal/artille
On 02/07/2016 02:15 PM, andy pugh wrote:
> https://en.wikipedia.org/wiki/Welin_breech_block#/media/File:Sailor_looking_into_the_breech_of_16_inch_gun_aboard_USS_Alabama_(BB-60).jpg
>
> I suspect an extremely specialised machine for the internal version.
>
I restored a 75mm Krupp that had a similar
Andy,
Now I see what you are asking.
It would be educational to look at the part to see what the tooling marks
show.
You may be able to identify a pattern to know how they were cut.
On Sun, Feb 7, 2016 at 3:18 PM, andy pugh wrote:
> Maybe I should have been more explicit about the question...
>
In a shaper where the part being machined rotates. If you look closely there
is a small relief slot at the end of each thread.
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bruary 07, 2016 4:47 PM
> To: emc-users@lists.sourceforge.net
> Subject: Re: [Emc-users] Any idea how they machine these?
>
> A post on this page:
> http://yarchive.net/metal/artillery_thread.html
>
> says:
>
> In full size practice the male and female threads are SCREWCUT
A post on this page:
http://yarchive.net/metal/artillery_thread.html
says:
In full size practice the male and female threads are SCREWCUT (not Milled) on
specially adapted, relieving lathes with an interrupted indexing motion. This
usually takes the form of a special, heavy duty, "geneva" type m
On Sun, Feb 7, 2016, at 04:18 PM, andy pugh wrote:
> Maybe I should have been more explicit about the question...
>
> How do you machine an internal part-thread that ends hard against a shoulder?
>
Very carefully :-)
This pic
http://www.eugeneleeslover.com/PAGE_56_Figure_5B10_C.JPG
shows that
When in college at TAMU, the mech engr machine shop had some big
equipment. One lathe would swing about 6' dia, and 20'+ length in the
bed plus head stock. That was the largest engine lathe I have seen.
I never saw them use it, but it was kept in usable shape and yes, they
kept some standard tool
Considering that it was the 1940s, I'm not sure how common thread-milling was.
Plenty of room inside that breech - maybe a cam-operated "rapid retract" single
point threading tool?
Found this page, doesn't explain how they cut the threads but does elaborate a
bit on other construction features.
Super sized machines are still made. IMTS (in Chicago Sept 12-16 this year) has
had giant lathes in the past. I was amazed at one that had what looked to be a
railroad car axle with wheels which appeared to be turned from a single billet
of steel (that must have been enormous!). By the way, IM
Maybe I should have been more explicit about the question...
How do you machine an internal part-thread that ends hard against a shoulder?
--
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto
-
I have a friend who is a mechanical engineer at the Naval Ordnance
Station in Louisville. I inquired about the machining on these big
naval guns, and he told me that most of the drawings are from the 1940s,
and in general, the machining is manual and conventional, although the
lathes and othe
Andy,
I saw a 60 taper machine in storage here in Wichita.
It was from an arsenal.
The machine was huge. I would think it could cut the threads with a thread
mill or single point tooling with the size of the adapter.
I had never imagined an adapter that size.
The attached picture shows a comparison
https://en.wikipedia.org/wiki/Welin_breech_block#/media/File:Sailor_looking_into_the_breech_of_16_inch_gun_aboard_USS_Alabama_(BB-60).jpg
I suspect an extremely specialised machine for the internal version.
--
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto
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