70GTvert - 3/6/2009 6:45 AM
gosciu555 - 3/5/2009 12:10 PM
70GTvert - 2/27/2009 12:27 PM
I put my own spin on the spring refinement in those posts. I not only polish the ends down, I give them a round cross section again (you will see what I mean when you take it apart) as the whole idea is to reduce friction. By rounding the ends it puts the smallest spring area possible against the the guide surfaces, allowing for a smoother action then if it was left flat. Do not make a knife edge, just round it down again.
You will probably be able to get away with just rounding the cut off end of the spring and maybe the corners on the bottom. Rounding the bottom won't change the friction and will take a lot of work. The contact area will be smaller but that just means the pressure will be greater on those areas.
First, with a Dremel, it takes about 5 minutes per end. I guess if your using sandpaper, it wouldn't be worth your time, but I am not sure what you may or may not be using to do this.
Now, a simple thought experiment if you will. Put a large heavy overweight jellybean of a person on a sheet of ice wearing nice flat bottomed treaded shoes. He can be moved, but it will take a certain amount of force to do so. Smooth out that tread, and he may move a little bit easier when you push. Now, we take this same Jabba the Hut and put him on a nice set of Ice skates. Yup, sure 'nuff is a smaller contact area with more pressure on those little blades, but guess what, it takes much less effort to get me, er, that lard-o moving than when I, er, he was just on rubber soles. No, it will make a difference. Just make sure the ends are up against a hard surface.
And yes, there are very nice and informative instructions to help guide you with a tune posted out there. But as in all guides, nothing is firmly set in stone, it is a guide. Even Charlie recently got involved with a thread of what grit sandpaper to use in honing the tube, and noted in that discussion that he would use a finer grit than is noted in those instructions initially written by him.
Not quite. Ice skates work because they melt the ice where you stand on them. A better experiment would be to try to push that fat person when he's standing on both skates vs when he's only standing on one. One has twice the area of the other. I think they would be close. An even better experiment would be to take a nice and smooth metal plate and try to slide a block over it. Get two block of the same weight but different contact areas. The friction force shouldn't change.
Yeah I was a geek in HS ;) jk
Here is a wikipedia,
http://en.wikipedia.org/wiki/FrictionAlso, in this spring there might some things going on like the spring sides catching on something or something to this effect. Anyhow this discussion is getting a bit too academic for an airgun forum ;) Can you say from experience this has reduced the torque?
