3D Chevron Wrap. Please Help!

[bltbowhunter]

So this wrap is not supposed to be this hard, but apparently it is for me. I was up last night for hours trying to just get the layout threads on the rod. For some reason, I just can't wrap my head around it. The rod that I'm using is 38mm in the middle section of the rod where my wrap is gonna be. Looking at the pictures in Billy's book, I can't figure out what my spacings should be. Am I supposed to wrap it on 4 axis' with 9.5 mm between each cross, or do you do it on 2 axis' with 19 mm between each cross? Any help would be greatly appreciated.

Thanks,

Jeremy

[upnorth]

If you are going to use square spacing....pi X diameter will give you square spacing. That is the most common. Less and it will be squat and more it will elongate it.

I am trying to make sense of 38mm and I assume that is the circumference? If so that should be your spacing. I normally start with the diameter then multiply that by 3.14 to get the spacing.

So what you would want is .38 center to center spacing from where you are going to start on the top and the bottom the first spacing would be 38/2 or 19 for the first one then 38 for the rest.

[bltbowhunter]

Yes 38 is the the circumference (actually 37.68) and 12 is the diameter.

I was just sitting here thinking about it more and looking at some other wraps online. It seems to me that I need make a dot on all four axis' every 9.5 MM, and then make 4 passes up and 4 passes down with my layout thread. What do you think?

[upnorth]

If you are looking for a 4 axis wrap that would be right. I have done those and you really need to pay attention to your passes as it is really easy to lose track of what pass you are on which axis. I did a scale wrap on a multi access like that and it was pain staking keep track of where you are at.

[clKiekhafer]

I'm glad this topic is coming up. I'm thinking of starting one that is on 4-axis and also needed to have a little more of an understanding.

And I do agree that Billy's book is a little hard to understand all of the charts and such. It seems to me that if he would have taken one design and did a step-by-step using the various charts/tables and such it would have been easier to understand and follow, but then maybe that was by design?

[bltbowhunter]

I'm in the process of doing it now. It took me about 2 hours to get the layout threads wrapped. I marked the blank on each axis every 9.5mm. Then just wrapped around hitting every consecutive mark as I turned the rod. After I wrapped the layouts I made sure all of the crosses were straight by checking it with that line up tool from flex coat. It was a tedious process but i think i did a pretty good job getting everything square. I put cp on the crosses to make sure they wouldn't move. I don't think I'd do that again as it made it harder to get the threads tight to the layout threads. Hopefully I will be able to work on it today when I get the kid down for a nap!

[upnorth]

I wouldn't do the cp on the layout wrap either. But as you get some more threads down they should help hold as you pack the threads against the lay out threads.

[bltbowhunter]

I finished it up last night. It turned out ok for my first time. Hopefully next time I can get it a little tighter. Thanks to those who helped me out with my questions!

[clKiekhafer]

It looks nice, you have nothing to be a shamed of. You will learn more as you go.

[upnorth]

Looks good.

[A.W.Wolfram]

Looks straight, tight and uniform. Good job on the layout.