Limb alignment ............

[Vittorio]

In the present days is perfectly possible to make perfectly straigth risers and perfectly aligned bushing holes from a modern milling centre. Only, it costs money to do so. Speed of the process is agains precision and quite often bilds twisting in the final riser. High level milling machines and a slow pocess make almost perfect parts, but with a cost that is often not immediately perceived by the user... until he tries to align the center of the riser with his 30" long rod on it...
The most critical point in risers quality is to have the 2 planes of the inner limbs pockets parrallel each other. This makes a riser worth to check if limbs on it are straight. Let me say that very few of the commercial risers are matching 100 % this vital parameter. For instance, if the thickness of the paint inside the pocket of a painted riser is not perfectly uniform, even a perfect riser will show twisted limbs on it. How many of you have filed the inner pocket paint of a painted riser to adjust limbs? I can grant you that is an almost indispensable process to get to a good final assembly.... one or two tens of millimiter of paint more one side to the other may mean several points over a FITA round...
Anyhow, By Bernardini suggests in the riser manual to use (a straigth) long rod to align the limbs with the center of the riser, because we mill the inner pockets and we drill the long rod hole in the same process, without repositioning the riser (that happens 2 or 3 times with traditional milling processes). This grants that the relationship between these points is what is needed to get an almost perfect alignement.
By the way, I will never suggest to use the inner or external window part for any kind of alignement with any riser of any manufacturer, as varius processes (painting, added carbon parts, hand polishing, secondary processes) may introduce some tolerance in their parallelism to the center of the riser that are of course not important at all to the quality of the riser.

[buzz lite beer]

thats basically what I said!

[BorderBows]

Originally Posted by Vittorio

In the present days is perfectly possible to make perfectly straigth risers and perfectly aligned bushing holes from a modern milling centre. Only, it costs money to do so. Speed of the process is agains precision and quite often bilds twisting in the final riser. High level milling machines and a slow pocess make almost perfect parts, but with a cost that is often not immediately perceived by the user... until he tries to align the center of the riser with his 30" long rod on it...
The most critical point in risers quality is to have the 2 planes of the inner limbs pockets parrallel each other. This makes a riser worth to check if limbs on it are straight. Let me say that very few of the commercial risers are matching 100 % this vital parameter. For instance, if the thickness of the paint inside the pocket of a painted riser is not perfectly uniform, even a perfect riser will show twisted limbs on it. How many of you have filed the inner pocket paint of a painted riser to adjust limbs? I can grant you that is an almost indispensable process to get to a good final assembly.... one or two tens of millimiter of paint more one side to the other may mean several points over a FITA round...
Anyhow, By Bernardini suggests in the riser manual to use (a straigth) long rod to align the limbs with the center of the riser, because we mill the inner pockets and we drill the long rod hole in the same process, without repositioning the riser (that happens 2 or 3 times with traditional milling processes). This grants that the relationship between these points is what is needed to get an almost perfect alignement.
By the way, I will never suggest to use the inner or external window part for any kind of alignement with any riser of any manufacturer, as varius processes (painting, added carbon parts, hand polishing, secondary processes) may introduce some tolerance in their parallelism to the center of the riser that are of course not important at all to the quality of the riser.

Very much in agreement!