|
|
|
S |
M |
T |
W |
T |
F |
S |
|
1
|
2
|
3
|
4
|
5
|
6
|
7
|
|
8
|
9
|
10
|
11
|
12
|
13
|
14
|
|
15
|
16
|
17
|
18
|
19
|
20
|
21
|
|
22
|
23
|
24
|
25
|
26
|
27
|
28
|
|
29
|
30
|
|
|
|
|
|
|
|
Forums10
Topics38,935
Posts550,902
Members14,460
| |
Most Online1,344
Apr 29th, 2024
|
|
|
|
Joined: Jan 2006
Posts: 15,457 Likes: 88
Sidelock
|
Sidelock
Joined: Jan 2006
Posts: 15,457 Likes: 88 |
Not all English were built like Purdeys many were knocked out by guys on a pittance to be sold for a few shillings. They were cheap and nasty and fortunately most are long gone . Here's a cheap and nasty one....I'm sure it was just done to hide a cheap and nasty rib. 
|
|
|
|
|
Joined: Jul 2011
Posts: 839
Sidelock
|
|
Sidelock
Joined: Jul 2011
Posts: 839 |
jOe:
You da speed man! I ask and you post! What a Birmingham clunker! Excellento Tripolo... dat Latin or somthin? Must be a Spanish gun! You old fox...
|
|
|
|
|
Joined: Dec 2001
Posts: 12,743
Sidelock
|
|
Sidelock
Joined: Dec 2001
Posts: 12,743 |
Lefever called their ribs Engine Turned. Bill has acurately described a method by which they could be made, I don't truly know for certain just how Lefever did them. This would of course be on a flat one. Some of their ribs were concave & also had the engine turning. In this case the cutter would have to be tipped at an angle & run down the rib thus cutting on one side only. The mill would then have to be tipped the other way & the opposite arcs cut.
Miller/TN
I Didn't Say Everything I Said, Yogi Berra
|
|
|
|
|
Joined: Apr 2011
Posts: 1,850
Sidelock
|
|
Sidelock
Joined: Apr 2011
Posts: 1,850 |
Lefever called their ribs Engine Turned. Bill has acurately described a method by which they could be made, I don't truly know for certain just how Lefever did them. This would of course be on a flat one. Some of their ribs were concave & also had the engine turning. In this case the cutter would have to be tipped at an angle & run down the rib thus cutting on one side only. The mill would then have to be tipped the other way & the opposite arcs cut. The way that parts Ithaca of mine looks the x-axis on the mill would have a high feed rate also.
Practice safe eating. Always use a condiment.
|
|
|
|
|
Joined: Dec 2001
Posts: 12,743
Sidelock
|
|
Sidelock
Joined: Dec 2001
Posts: 12,743 |
The cutter is of course rotating, but yes the X axis is the only one feeding. It would have a farily high feed rate. What ever the space between two adjacent arcs is then it was feeding that much per revolution per flute on the cutter. If you lay a straight edge square across the rib & compare where the arcs end on each side of the rib it is quickly apparent it was cut with a moving cutter. If the cutter had been brought down to depth & cut an arc, then raised & the rib moved to a new location for another cut etc then the run off on each side would have been on a line square to the rib, but they aren't. You can even determine whether the mil was traveling from breech to muzzle or muzzle to breech by the cutter runout.
Miller/TN
I Didn't Say Everything I Said, Yogi Berra
|
|
|
|
|
Joined: Jan 2002
Posts: 631
Sidelock
|
|
Sidelock
Joined: Jan 2002
Posts: 631 |
The rib-matting machines I have seen in Germany can produce a pattern similar to the one seen on that lovely Scott.
The ribbed barrels are fixed to a carriage which rides horizontally on a very long bed. Overhead, the cutter is simply a bit shaped like the end a flat file, cut with the desired shape and number of grooves. The head containing the bit "wiggles" back and forth at an adjustable rate as the rib passing underneath is engraved. The amplitude of the "wiggle" varied with the speed of the carriage and shape of the cutter, provides an almost infinite number of possible patterns.
Best,
c.
Last edited by C. Kofoed; 10/07/11 11:15 PM.
|
|
|
|
|
Joined: May 2010
Posts: 1,534 Likes: 95
Sidelock
|
|
Sidelock
Joined: May 2010
Posts: 1,534 Likes: 95 |
Thats just what I was going to say but a bit more technical. Think of it as basicaly like a planing machine [thats metal not wood] Some cut the grooves one at a time to accomodate tapered ribs . Bailons had the last one in Birminham ,they sold it on and I understand it changed hands since and it is currently in pieces after several attempts to re build it .
|
|
|
|
|
Joined: Jan 2002
Posts: 631
Sidelock
|
|
Sidelock
Joined: Jan 2002
Posts: 631 |
The machines I saw in Germany were old too. I have photos somewhere but it involves scanning a slide. I'll try to find them in the next month or so (it is bird season).
C.
Last edited by C. Kofoed; 10/08/11 09:46 PM.
|
|
|
|
|
Joined: Feb 2004
Posts: 13,880 Likes: 16
Sidelock
|
|
Sidelock
Joined: Feb 2004
Posts: 13,880 Likes: 16 |
CK, Is this the pattern that you saw? 
|
|
|
|
|
Joined: Dec 2001
Posts: 7,089 Likes: 462
Sidelock
|
Sidelock
Joined: Dec 2001
Posts: 7,089 Likes: 462 |
 this is the machine that Winchester used, now located at the Gunworks of Central New York.
|
|
|
|
|
|
|
