I don't know Bob. The problem with what you describe, imo, is that you're probably not going to be that consistent. When you're making a panel and go through a stretch/shrink process and find the panel still needs more smoothing or stretching, you just increase the pressure a little and wheel a while. If you had a set clearance and a stiff frame, you've basically got a rolling mill but a set clearance probably won't give you the finess you want to obtain the shape you're after...
Just my opinion.
Have you considered an upper adjuster. Kickwheels have little feedback to tell you how much pressure you're applying but the handwheel and your hand is Gods own torque wrench and I find it very repeatable and controllable.
Been following this thread and others like it for a while..
Made my last 2 e-wheels and the third one is partially CAD-ed up. As of late I wa thinking the same thing about repeatability along with keeping both hands free.
My second unit was a kicker style adjustment that went through several modifications until I realized something else may be needed.
Currently debating a gearbox with an indexing motor or some other way which would allow me to have a "value" assigned to the wheel used that could be easily repeated fro later use.
Almost wish there was a "standard" that could be utilized but most likely will set the value to be a function of the number of threads used or possibly a force gauge would be slipped in to give me a running reading of what I'm doing.
If anybody has suggestions or caveats don't hesitate to educate me.
Thanks, Bob Lovell --- On Thu, 7/2/09, John Buchtenkirch <jbhammer@...> wrote:
From: John Buchtenkirch <jbhammer@...> Subject: [metalshapers] Re: pre stretching To: metalshapers@yahoogroups.com Date: Thursday, July 2, 2009, 7:23 AM
I was thinking while I was doing mine. Yeah I know... If a person were to index his handwheel/kickwheel with some type of repeatable markers and then kept a good shop notebook of what index for what bead with what width pre-stretch in what material, it should be a repeatable process without the trial and error every time. At least I don't see why that wouldn't work. Something to try if doing a lot of bead rolling anyway. ~ Kerry Pinkerton
Kerry, don’t see how that couldn’t work on a run of parts that had the same bead and same gauge metal. That is the advantage of doing runs of parts over the one of hero type jobs, sometimes you can figure out how to produce parts quickly enough to make some serious $$$. I think if I had to do a large run of beaded parts I would devise beading tooling for the Pullmax that was surrounded by pressure pads so the beading would be truly stretched in to eliminate the pre stretching step all together. Just thinking out loud. ~ John Buchtenkirch
When I prestretch a panel before rolling a bead is there a rule of thumb on how wide an area and how deep? I plan to roll in a bead roughly 3/4 wide and 3/8 +...
Tim Rick Mammel {spelling] had a post on procedure using a E-Wheel with thin lower wheel . John B. also had a procedure with CP air hammer. I just tried the...
Gordo, That would have been Rick Mullin who did a very nice step by step of the prestretch for a tapered bead on a RR fender skirts. Maybe Mr. Mammel will...
When I prestretch a panel before rolling a bead is there a rule of thumb on how wide an area and how deep? I plan to roll in a bead roughly 3/4 wide and 3/8 +...
Tim, Being there is so many different machines & dies that could be used for the stretching operation there will never be any rules on that, it just boils down...
I agree that every bead will be different and the 'amount' of pre-stretch required will vary accordingly. Trial and error is the only way I know of. I tested...
Tim, one thing you can do is put a piece of tape on your hand/foot wheel so you can dial back to the same point. One of the very few times I've actually used...
The key point is you need to do directional stretching because the beading operation pulls the metal in from the sides, only about 30% of the bead results from...
I agree with John. As far as width goes, in my somewhat limited pre-stretching I discovered that staying close to the bead width worked well. In my previous...
I was thinking while I was doing mine. Yeah I know... If a person were to index his handwheel/kickwheel with some type of repeatable markers and then kept a...
 Yowza All,    Been following this thread and others like it for a while.    Made my last 2 e-wheels and the third one is partially CAD-ed up. As...
I don't know Bob. The problem with what you describe, imo, is that you're probably not going to be that consistent. When you're making a panel and go through...
I'm not a practicing metal shaper but my long-time friend , John Toom, had a solution for the problem that is being discussed. He made a "C" shape of sheet...
In a message dated 7/2/2009 5:11:52 PM Mountain Daylight Time, rossw.lovell@... writes: If anybody has suggestions or caveats don't hesitate to educate...
 Yowza CaptonZap,       The hydraulic cylinder replaces the acme screw thread that would usually be moved via a kicker or handwheel? Love the idea...
In a message dated 7/8/2009 2:22:18 PM Mountain Daylight Time, rossw.lovell@... writes: I'd expect a too-hgh setting would mar the metal in a way not...
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