Talk about perverted, I was just on your other forum and opened one of the pictures in your Condor post .http://airgunhome.com/agforum/viewtopic.php?t=7370 What the heck is going on there ?
Talk about perverted, I was just on your other forum and opened one of the pictures in your Condor post .http://airgunhome.com/agforum/viewtopic.php?t=7370 What the heck is going on there ?
Haha....I remember that thread! Eric took a bit of ribbing over that one...Originally Posted by jpsgunworks
Oops... maybe "ribbed" was a poor choice of words!
Todd
Don't sweat the petty things, and don't pet the sweatty things!
Why do you think we have this fancy software here?
Stupid free photo hosting services...
I'm not rushing out the door for work now, so please forgive the bluntness of my earlier post.
FWIW, I think the precision of the crowning job is the important point, regardless of the angle (to a certain extent). The best factory crowns I've seen were on the old USA Winchester rifles. They were Bob's 90 degree job behind a slight ridge recess. I have a 94-22-M here from the first run that will stack 50 grain Federals into the same hole all day at 100 yds...
To recess, or not? I'm a hunter, and all the muzzle [protection I can get is important. Most of my a/g's have some type of a brake for this reason. I'm not capable of determining which is more accurate- I simply don't have the measuring tools...
Regards,
Doc Sharptail
"Ain't No Half Way"
-S.R.V.
OK, Sean, I'll throw a question at you.... If you are cutting the crown in a lathe at 90* to the bore.... why do you have to make sure the bore is concentric?.... I realize that if the bore was going around like an egg, the tooling marks would be spiraling away from the edge of the bore.... but if the finish is good enough does it really matter?....
In addition, in an airgun (or a powderburner, for that matter) aren't the escaping gasses going about the same velocity as the pellet/bullet?.... Therefore, if you have a stepped crown (ie 90* with an outer lip) wouldn't the bullet have to be pretty much the same distance from the muzzle as the distance from the edge of the bore to the lip before the air could be forced to change direction.... and if that's say 1/8", then the air would have to be reflected off the lip and then try and catch up with the bullet to disturb it.... That seems to me an impossible task....
I humbly submit, therefore, that any 90* crown cut square to the bore on a lathe with even reasonable surface finish would be fine.... I would just remove any burrs with a polish with fine grit and a sphere.... eg. brass screw and bore bright.... If I'm wrong (and I may be), please enlighten me where my reasoning is flawed....
Bob
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal: Too many to count!
Bob
In all the super slo mo footage I've seen for PB the gases are moving substantially faster than the bullet. Have a watch of this U tube I found on a quick search. Some of the others I've seen show the bullet emerging out of the gas plume.
https://www.youtube.com/watch?v=otpFNL3yem4
The reason for taking the time to align the bore axis is because they are never axially parallel to the OD. Well actually I have only seen one out of how ever many I've done. They are always a measurable amount angular to the barrel.
Sean
I would not put that thing down my LW barrel.
Benjamin Discovery Mac1 modded <----- Ya Baby the new toy
Webly Alecto .177
QB79- with lots and lots of mods HPA <------ Go too AirGun for FT
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