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gunsaholic #570874 04/28/20 09:31 PM
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Interesting process on tube making and the connection to Meffert.
That was a fair amount of tubes being rolled out.

gunsaholic #570881 04/28/20 09:48 PM
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Yes, those were all rifle & shotgun tubes. They made many other like heavy mortar & I'm sure tank barrels. But the sporting arm barrels were noted as being much stronger than the wound or coiled damascus barrels/pattern welded tubes.

Cheers,

Raimey
rse

gunsaholic #570884 04/28/20 09:59 PM
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Yes, I could see that if I am correct in thinking that the radial process involved forming the tubes under hydraulic pressure?

gunsaholic #570889 04/28/20 10:16 PM
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Below is a forced translation:

>>....the Ehrhardt pressing process using special steel is particularly suitable for the manufacture of hunting and military rifle barrels. After the ingot is pierced, the barrels are given several passes, pass through a conical rolling mill and are ground to exact calibre. In the conical rolling mill, the cylindrical barrels are not only given a tapering shape, but the shell material is also spiralled along its longitudinal axis......<<

Cheers,

Raimey
rse

gunsaholic #570892 04/28/20 10:26 PM
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Ah, that explains the process more clearly. Thanks.

gunsaholic #570915 04/29/20 07:01 AM
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Not sure that the method is fully clear, but it points in a general direction.

>>In Deutschland wurde eine ähnliche Art der
Rohrerzeugung zuerst im Jahre 1892 von der
Rheinischen Metallwaren- und Maschinenfabrik in
Düsseldorf ausgeführt, nachdem der Hauptinhaber
dieser Firma (Geheimer Baurat Heinr. Ehrhardt, ein
auch sonst in der Rohrfabrikation mit hervorragenden
Verbesserungen und Erfindungen hervorgetretener
Geist, den Oberingenieur und Betriebsleiter Green
der vorgenannten Spiral Weld Tube Company in
East Orange nach Europa geholt hatte und dieser
mit dem deutschen Ingenieur Leybold eine Neu-
konstruktion der bekannten amerikanischen Maschine
vorgenommen hatte, deren Ausführung die Maschinen-
fabrik Heinr. Ehrhardt in Zella übernahm. <<

A bit of German for those few who have command & are following along. Interesting that it mentions a >>Spiral Weld Tube Company<<??

>>Weitere Einrichtungen und ArbeitsvorschlSge zur
Erzeugung von spiralgeschwei£ten Rohren sind in
Deutschland noch von Julius Wttstenhöfer (D. R. P.
Nr. 51069, 53532, 58163 usw.), Carl Kratz und
Julius Straßmann (D. R. P. Nr. 63307) sowie von
Eduard Zimmermann (D. R. P. Nr. 65088) gemacht
worden. <<

Some advancements in Spiral Tube technology by Germans......

Cheers,

Raimey
rse

gunsaholic #570917 04/29/20 07:10 AM
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A re-post with a bit more info:

Alleinige Verwertung
Der Gewehrlauf-Marke
R.O.M.(Rheinischen Metallwaren- und Maschinenfabrik)
Radial-Stahl-Rohr-Extra Qual
(Patent Ehrhardt)

Cheers,

Raimey
rse

gunsaholic #570919 04/29/20 08:08 AM
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A bit more general info:

>>Ehrhardt'sches Preß- und Ziehverfahren:

128 Patente wurden von ihm im Deutschen Reich registriert. Die 1891 patentierten Verfahren, die unter dem „Ehrhardt'schen Preß- und Ziehverfahren“ zur Fabrikation nahtloser Rohre bekannt wurden, werden heute noch in der Industrie angewendet. Bekannt machte ihn auch die Entwicklung des Rohrrücklaufgeschützes. Die 7,5-cm-Ehrhardt Modell 04 Gebirgskanone, an deren Entwicklung und Produktion er maßgeblich beteiligt war, wurde nach ihm benannt.<<

By 1903, due to conflicts & disagreements with shareholders the adept inventor withdrew from some or all parts of his individual businesses.


Cheers,

Raimey
rse

gunsaholic #570924 04/29/20 08:57 AM
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I hit the translate site, lol. Interesting info on the tubes. Ehrhardt had quite a number of patents.

gunsaholic #570928 04/29/20 09:16 AM
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Yeah, here's an old thread on Heinrich August Theodor Erhardt tubes:

https://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=177833

And his 1893(U.S. of A.) metal vessel fabrication patent:

Nr. 495245A

https://patents.google.com/patent/US495245#v=onepage&q=&f=false



Cheers,

Raimey
rse

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