Muzzle Brake early versionThis Drawing is based upon a drawing which can be found in different versions in the Spielberger book and the Bovington museum's Plans Pack. The Bovington document also showed a few dimensions. Using these dimensions combined with a lot of photos and a few dimensions I took from the Saumur Tiger in Munster, resulted in a completely new drawing.
The few Bovington dimensions are coloured red, while the magenta ones are my own interpretation. Although this drawing is a large improvement to my previous one, it may contain inaccurate data. Unfortunately, I won't be able to take dimensions of the real thing for some time. If you have the opportunity, please contact me. I would like to see some important dimensions confirmed or proven wrong!
In the drawing I didn't give measurements of the several threads, that is because they are not visible, I don't have them and they would probably have to be adapted to your specific model size.
Sometimes we can see the Muzzle Brake in a rotated position; This is not normal. There are two "locking" sleeves in the barrel, so the MB can only be secured to the barrel with the locking bolt in the up or down position. So, when the MB is not in a correct position, the whole barrel has rotated for some reason
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Looking at the side of the MB you can see two holes. The one at the front has a simple rectangular shape, placed at 30º angle. The other tapered one is very complex. So far I found no satisfying solution to explain it's shape correctly in the drawing.
The scheme, below-left in the drawing, combined with the text below, shows a possible solution for making the hole and should explains it's shape. If you have problems understanding it, please contact me.
Step 1: Horizontally mount a fraise at 30º to point "X", then rotate the MB + and - 25.68º in order to make a cone shape.
Step 2: (See the 30º hole scheme) Mount the fraise at a 30º horizontal angle and fraise the lines PS and QR at vertical 15º angles.
Step 3: Rotate the MB another 15º so it will now be at 45º. Now put the fraise to point "Y" and fraise the line SR.
MCL reported some faults in the drawing.
- The bushing ring has eight grooves instead of the 6 in the drawing.
- The bushing ring grooves go all the way through the height of the ring.
- Two types of locking rings are used for the MB. Look at the difference between the Saumur and the Bovington Tiger.
The bushing ring errors are clear and will be corrected in near future. The locking ring needs some more research for the types used.
Some more points need to be discussed.
New data from the Bovington museum arrived and will be processed in the near future.
Bov-01, Vince Abbott |
Sa-01, Rob |
Sa-02, Horst Kölbel |
Sa-03, Horst Kölbel |
bov-02, Vince Abbott |
bov-03, Vince Abbott |
sa-04, Rob |
Sa-05, Horst Kölbel |
sa-06, Rob |
sa-07, Rob |
