When I was a begining apprentice electrician working the oil fields, my
second week an old journeyman showed me how bend rigid conduit which was all
we used. He made me make 2 90* bends and one 6" offset in a 10' stick of
1/2" with what was called a hickey. When I was done and he accepted it he
handed back to me and told me to use the same hickey and straighten it back
out so it would roll. Took me about 3 hours to get it back straight enough
to roll....I learned not to make bad bends and how to corrected them. A
lesson I learned for the rest of my career........Don't need no special
tool.......JD
> Mayf;
>
> I've never seen one, much less used one, but it sounds like a handy thing
> to have.
>
> Regards, Neil Tucson, AZ
>
> -----Original Message-----
> From: Larry Mayfield
> Sent: Sunday, February 01, 2015 9:51 AM
> To: land-speed@autox.team.net
> Subject: [Land-speed] Tubing Straightener Design Parameters
>
> Ok, so here I am, in Pahrump, just fiddling around and decided to build a
> tube straightener. So I does a google search and find a zillion photos of
> the things, but sadly, no real design considerations. I know the basic
> layout of a single axis doohickey, but there are a few details missing.
> Such as the diameter of the wheels (pulleys?), the spacing between them,
> and
> so forth. Now, I know that commercial units, powered even can be had,
> but
> heck building one is more fun! So, any of you guys have one or more that
> you
> could measure and then send me the rough basic dimensions? I made one
> yesterday and it sorta works, but improvements are needed, lol. For the
> frame work I used some very flimsy 1/8 inch thick angle iron. And for the
> wheels I used popular wood! Made some pulleys to fit the tubing diameter
> (-8 aluminum) and used just plain bolts for the axles of the pulleys.
> Definitely needs to be stronger. The wheels were made as I said from
> popular wood available at home depot, and I used my 4 inch diameter hole
> saw
> to cut the basic wheel from the plank. Then used my very old lathe to make
> them all the same size and to cut the u shaped groove. I made the two
> upper
> wheels the exact same way and used the same frame material. I made it
> adjustable for squeeze on the tubing with a couple of all thread rod
> pieces,
> one at each end. As I said, this sorta worked and needs major rework.
> Especially in the frame area. I have that covered, but am sorely in need
> of
> a reality check for the sizes and spacing or the stuff.
>
> Any help out there?
>
> MTIA,
>
> mayf
>
> _________________________
> drmayf
> Worlds Fastest Sunbeam, period.
> 204.913 mph flying mile
> 210.779 mph exit speed
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