Few question about Bead roller dies

[Murzul]

Hallo, All.

I'm made bead roller and last what I need to do - dies.
I'm never take in my hand bead roller and afraid make mistake in plan for Lathe.
I'm deside what profile I need. And know about die diameter, wich depends from gear and sheet metall thin.
I'm interesting in showing size for the calculation dies cross-section.
As a sample I'm afraid that if H will be large and X small. Sheet metal can't enough strach and will be damage or area around curve.
http://www.metalmeet.com/forum/picture.php?albumid=40&pictureid=3336

So, anybody can measure his bear roll dies and write size I'm interesting in.
I'm think it will be interesting for all members.

1/4, 3/8, 1/2 round bead roll sets
http://www.metalmeet.com/forum/picture.php?albumid=40&pictureid=3332

1/16, 1/8, 1/4 step bead roll setsas
I'm understand both bead roller dies are simple and D1=d1, D2=d2, S1=d1, S2=s2
http://www.metalmeet.com/forum/picture.php?albumid=40&pictureid=3333

hem bead roll set
http://www.metalmeet.com/forum/picture.php?albumid=40&pictureid=3334

wire adging set
http://www.metalmeet.com/forum/picture.php?albumid=40&pictureid=3335

[oldgoaly]

Hi Daniil

Think we lost your post last week, and I do believe Rick in Madera linked you to Mittler Bros. http://mittlerbros.com/bead-rolls.php and here http://mittlerbros.com/rotary-machine-rolls.php another place is lowbuck, http://www.lowbucktools.com/beadroller.html I hope that helps! tt

[kit]

My D1 is 70mm, which is large, it is not critical, just follow your own feel for it. What makes more difference with a bead roller is how you use it not the die profiles (within reason).
Lubricate the dies and sheet, form you beads in at least three passes, increasing the depth each time, smooth feeds are really important so motor drives are well worth it, or a second person handling the feed, also use a guide fence to run the work along.
Most of the problems with bead rollers are sheet distortion out side the area being worked, technique can make all the difference.
I would sugest you just make one set of dies that form a 10mm round profile bead and practise with those, once you can get a really good result with those you will have a good understanding of how to use the machine and make any other shaped dies.
Good luck, enjoy it!