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Benders and Bending Which bender is best? How do you use a bender? How do you calculate bends? Everything Bender related...


Benders and Bending Which bender is best? How do you use a bender? How do you calculate bends? Everything Bender related...

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  #1  
Old 03-16-2007, 08:50 AM
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Roughshod Roughshod is offline
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My ProTools 105HD hydro conversion

I thought you guys might like to see the hydro conversion of my PT 105HD. I'm pretty stoked at how well it turned out.

Here's my home made power pack. The motor is a 2 HP Harbor Freight, probably the iffiest component in the whole system. The pump I scored used off of eBay for $36. It's a .5 GPM, 3000 PSI pump, identical to the smallest one that Northern sells. I should note that the damn HF motor is clearly labeled as a counter clockwise rotation, non-reversable motor, but rotates it clockwise. I didn't find this out until I had the whole thing plumbed up. I threw the switch and had no flow. Fortunately the pump I scored was reversable, so all I had to do was swap the inlet and outlet. If it had not been a reversable pump I would have been pretty mad.


Here's the power pack mounted on the frame with the filter.


Home made hydraulic reservoir, formerly a rusty chunk of 6" pipe I found lying in a ditch. It's a touch over 2.5 gallon capacity, way over kill for a system this small.

Four way valve and switch.


Here's a good shot of the whole unit. I used a 2" bore 24" stroke cylinder.


Built in grinder rack and outlets.


Swank laser pointer, thanks for that idea.


And one more shot of the whole bender. I built the support frame out of channel from 19" electronic equipment racks, which was some surplus from work. The backbone is 2.5" square tube, 1/4" wall. I should have took a pic of the cylinder mount, I'll try to remember to do that today.


I've still got a few more little things to add like shelves and die hangers, but I've got to say that I'm extremely pleased with how well it came out. Performance wise, it takes 17 seconds for one full extension of the cylinder with the valve wide open, and you can "feather" it to sneak up on an angle. That's one of the things I really liked about the manual valve over a solenoid actuated setup. One thing that suprised me was that it didn't seem to bog down under load at all, bending 1.75", .095 wall HREW the time to stroke to full extension was exacty the same as it was unloaded, 17 seconds, and the max pressure that I observed on the gauge was about 1200#. It can make a 90 degree bend without having to re-pin the die, in fact full extension of the cylinder yielded a 104 degree bend after spring back.

I think I'm really going to enjoy this machine. Let me know if you guys have any questions or want some better pics, it was dark out when I took those.

Last edited by Roughshod; 03-16-2007 at 05:15 PM.
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  #2  
Old 03-16-2007, 09:56 AM
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fabcam fabcam is offline
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Thanks for the great write up.
__________________
The Designers of Bend-Tech Products
www.Bend-Tech.com
Bend-Tech Dragon web site:
http://www.BendTechDragon.com

Cris Merry
Phone: 651-257-8715
Cris@bend-tech.com

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  #3  
Old 03-16-2007, 05:18 PM
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Captainfab Captainfab is offline
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Nice job! And thanks for the pressure info too.....I've kinda wondered about how much pressure is needed in a system like this. I noticed in one pic that the anti slip bolt is missing....are you bending without it? The backing block tension bolt is missing too. May be that you aren't totally set up for bending yet?
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Old 03-17-2007, 01:06 AM
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Roughshod Roughshod is offline
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Yeah, I'm not set up yet in those pics. That piece of tube in the bender is just there to keep the follower block from dropping while I was stroking the cylinder during testing.
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Old 03-17-2007, 01:15 AM
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Rokcrler Rokcrler is offline
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Sweet setup... gathering parts for my conversion now...
Nice "laser"
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  #6  
Old 09-18-2015, 12:22 PM
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Hot Rod Alley Hot Rod Alley is offline
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I know this is an old post, but I have a question about it. The pump used says it is a .5 gpm 3000 psi. I was wondering if that is a typo. That does not seem like very much flow rate. I thought it might have meant 5 gmp? Also what is the psi rating of the cylinder used?
It's a great looking conversion and I'd like to do one like it.
Thanks
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  #7  
Old 09-18-2015, 10:29 PM
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John2500HD John2500HD is offline
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Where did you get your valve? I have seen them at granger but they are not cheap there.
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Old 09-18-2015, 11:07 PM
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Rokcrler Rokcrler is offline
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Here is the valves...
http://www.northerntool.com/shop/too...+detent-valves

Clint is the fluid master calculator... Hopefully he can shed some light
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Old 09-19-2015, 05:20 AM
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John2500HD John2500HD is offline
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Thank you. I didn't even think to check northern tool.
I like the fact that you can creap with it too as you approach your desired angle. I definitely don't want a valve that's a crude "on & off" with a stiff detent.
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  #10  
Old 09-19-2015, 05:31 AM
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John2500HD John2500HD is offline
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What kinda toys have you built with your bender?
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  #11  
Old 06-03-2016, 10:30 AM
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ducas99 ducas99 is offline
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Do you have any video by chance on utube I'd be interested in a set up like this looks very cost effective.
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  #12  
Old 06-10-2016, 02:16 AM
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ducas99 ducas99 is offline
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Are there any active threads about electric hydraulic benders ?
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  #13  
Old 06-13-2016, 04:46 PM
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Captainfab Captainfab is offline
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I'm not aware of any.

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Originally Posted by ducas99 View Post
Are there any active threads about electric hydraulic benders ?
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