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Old 09-11-2018, 02:32 PM
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Default Hydraulic tube bender

I have a JD2 tube bender and never really had a good mount for it. I welded up a mount that went into my truck hitch receiver and that has worked well, but not usually a good way of doing it for me.

So today I welded up a new frame for it and converted it to air over hydraulic with the harbor freight air ram.

Works awesome!! If you have a JD2 bender and would like to do the same, let me know and I can get you my plans I did in cad.
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Last edited by landuse; 09-11-2018 at 11:51 PM.
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Old 09-11-2018, 07:24 PM
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I like!

I'm not sure I'd be a fan of air as a medium though.. a true hydraulic system is much safer..
reading air ram from horror fright makes me would want to take a step back or two let's say

but to be fair, I have no idea about the involved forces (and cylinder psi for that matter)

'sid
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Old 09-11-2018, 07:32 PM
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What's roughly the cost to build this?
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Old 09-11-2018, 07:41 PM
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Originally Posted by Kartorbust View Post
What's roughly the cost to build this?
You need the harbor frieght 8 ton ram:

https://www.harborfreight.com/8-ton-...ack-94562.html

use a 25% off coupon and its about $75

2" x .120 steel tube and some flat stock, I think I spent about $70.

so maybe $150ish.

Also I used 2 of these castors:

https://www.harborfreight.com/materi...ter-90997.html

and 2 of these castors:

https://www.harborfreight.com/materi...ake-90992.html

That was another $30 if you want to use castors. I would, its heavy!!
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Old 12-29-2018, 09:07 AM
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I like!

I'm not sure I'd be a fan of air as a medium though.. a true hydraulic system is much safer..
reading air ram from horror fright makes me would want to take a step back or two let's say

but to be fair, I have no idea about the involved forces (and cylinder psi for that matter)

'sid
How is 100% hydraulic that much (if any) safer than air over hydraulic?
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Old 12-29-2018, 09:39 AM
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How is 100% hydraulic that much (if any) safer than air over hydraulic?
It's not. You said you put a harbor freight air ram on it. Not everybody has a harbor freight around the corner (or on their continent) to know what you meant. Just saying.
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Old 12-30-2018, 11:47 PM
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How is 100% hydraulic that much (if any) safer than air over hydraulic?
I couldnt say if it is or would be one way or the other...thats above my pay grade.

I can say that HF air ram I used has worked perfect and I have had no problems with this setup.
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Old 12-31-2018, 05:14 AM
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It's not. You said you put a harbor freight air ram on it. Not everybody has a harbor freight around the corner (or on their continent) to know what you meant. Just saying.
I didn’t say anything of the sort. Someone said “hydraulic is much safer than air”. I wanted them to clarify, since in and of itself neither one is “safer” from a functional standpoint.
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Old 12-31-2018, 06:45 AM
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Originally Posted by rockman96 View Post
I didn’t say anything of the sort. Someone said “hydraulic is much safer than air”. I wanted them to clarify, since in and of itself neither one is “safer” from a functional standpoint.

Air over hydraulic is not less safe than manual hydraulic. Straight pneumatics could get a bit hairy on something like a bender. A failed component would have a higher tendency to send parts flying, not to mention the lack of control for precision bends.

I think when you said "air ram" (twice now) it was just misinterpreted as meaning pneumatic.
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Old 12-31-2018, 06:47 AM
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if it's (as it likely is...) an air powered pump powering a hydraulic piston,
it doesn't make any difference in terms of safety.. it's as safe as a manual pump or an electrical for that matter.

The "air ram" naming is what made me cringe!
since an air displaced piston powering the oil system on the other end however
is a huge difference in terms of safety.

liquids are non compresable fluids (unlike gases which are compressable fluids)
means in case of a failure fluids want to escape and spray around (unpleasant)
gases however want to expand as rapidly as possible.
that is what's commonly known as explosion.

the difference is nicely shown in this video:

(at ~ 0:30-0:40 you see the bottle failing at the compressed air portion of the bottle [kablam]
at ~ 4.10++ [thumbnail] you see another bottle failing under the water line)

So yeah, hydraulic systems are much safer than pneumatic systems in applications like these.

'sid

PS I watched a yt video of a bike builder that had very much the exact same setup a few days ago..
the chuckachucka sound of his HF piston was soothing to hear.. since it very much suggests an air powered pump, not a simple displacment piston
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Old 12-31-2018, 09:15 AM
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Quote:
Originally Posted by anickode View Post
Air over hydraulic is not less safe than manual hydraulic. Straight pneumatics could get a bit hairy on something like a bender. A failed component would have a higher tendency to send parts flying, not to mention the lack of control for precision bends.

I think when you said "air ram" (twice now) it was just misinterpreted as meaning pneumatic.
Man, you must be confusing me with someone else, or you’re putting words in my mouth. I never said “air ram”. I have only said “air over hydraulic”.

I don’t think either is dangerous if properly used, but you are correct in saying that you have better control with a straight hydraulic system.
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