Leinen E125 bench vise restoration
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Bastel provided a link to the original 1890 Patent from Jos Leinen:
https://worldwide.espacenet.com/paten...
He felt front opening vises progressively loose guiding support the further they open.
It was well summarized by @MannoMax
As a German, this is how I learned it:
A vise with a back opening jaw is referred to as a machinists/toolmakers/mechanics vise, usually is made of cast steel, and is built much more heavily.
They are not as versatile as the other type of vise, but are much more accurate and stable. They were meant for precise bench work, like filing dies, or working on complex assemblies.
We also have vises with front opening jaws, those are usually called a smiths/ironworkers vise, they are usually made from forgings, are not as precise, but can handle much more abuse. They are meant for heavy work like chipping, bending, etc.
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Bastel's vise collection:
  / 8astel  
   / @bastel_  

Christian's Instagram:
  / elektronaut1  
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00:00 Intro
00:33 Initial inspection
01:05 Disassembly
04:56 Paint stripping
06:49 Electrolysis
11:22 Ultrasonic cleaner
11:49 Wire wheel
12:52 Sandblasting
13:02 Fine wire wheel
13:20 Mail time
13:43 Dressing off old scars
14:15 Weld up scars
17:57 Filing out scars
18:55 Die grinder
19:40 Extract broken screw
20:18 Flattening the anvil
20:36 Clarkson grinder set up
22:28 Milling the anvil on the Maho CNC
24:25 Paint prep
25:13 First under coat
25:37 Making new vise jaws
26:10 The DoAll is still playing up
28:19 spotting and second undercoat
29:18 Machining the jaw blanks
30:55 First top coat
31:37 Finish machining the jaws
36:20 Final top coat
36:54 Case hardening the jaws
41:53 Fasteners
44:12 Final assembly time lapse
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Music in this episode from Artlist.IO
AR Ferdinand No Matter What Happens Well Be Okay
Captain Qubz High Pulse
Castle Heist Are You Ready Stripped Version
Con Davison Sofa Bed Instrumental Version
Dan Mayo Black Willow
Dan Zeitune Siara Instrumental Version
Dialgo Kumare Brothers
Dizzy Newer
Family Kush Heavy Summer
Glories Pagan Holiday
Indiana Bradley Pale City Girl Instrumental Version
Kiss The Earth Call from Earth
Midnight Noise Neon Run
Peter Spacey Tech Knowledge
Risian Asteroid Field
RocknStock Fuel
RocknStock High and Low
RocknStock Run With It
Russo & Weinberg Take Me Out Instrumental Version
Seth Parson With You
The Magnetic Buzz A Real Cosmic Night
The Rallies Are You Hearing Me No Lead Vocals
YAHYAH Jupiter Calling