Hossfeld conversion to Hydraulic bender?

[GeneStoner]

Anyone out there converted their Hossfeld #1 to a hydraulic design using HF ram, etc?

If so, how? Pix? Plans?

[Wyoming]

Gene,
Not a #1, but I did convert a #2. Not even sure if the #1 is even produced anymore...though it shouldn't matter all that much as it is very similar to the #2. Do a search here and see what you can come up with from Dave Merdian's posts on the subject. I have some drawings of the conversion that I drew up after Dave was kind enough to send me some rough sketches of his conversion posted over on ShopFloorTalk if you want to do a search over there as well. BTW, no Harbor Freight parts, but I suppose you could substitute some into the design. I have a HF air over hyd. ram now on my shop engine hoist and wondered if the air reservoir was moved to an upright location...or even whether it needed to be moved...if it might not make a suitable ram for the Hossfeld.

Here's the link for the drawings over on ShopFloorTalk:

http://www.shopfloortalk.com/forums/showthread.php?p=229876#post229876

[Shop Outfitters]

Be careful with it, 5/8 Pins won't handle as much pressure as you will be putting into it. And once you bend them in the machine you will have to cut them out.

[Wyoming]

You may have a point. Still, all Hossfeld hardened pins are used or grade 8 bolts wherever there is a stress point . The relief valve is set for the same pressure as Hossfeld's hyd. power unit and the design is a direct copy of the Hossfeld set-up. I haven't had a problem with it, but should I ever have one I'll post back.

[whateg0]

...or grade 8 bolts ....

Even grade 8 bolts will bend. The hardened pins may not, but I'd be wary of the bolts. I've had them bend in applications like that before and it is a major pain to remove them.

Dave

[Wyoming]

Do what you want. It has worked well for me, but I could see where it might cause problems for some...

[fl70]

Wyoming, great setup on the mobile cart.

[Wyoming]

GeneStoner,
I realize it has been several months since you brought this post up, but if you still need help you might try looking up Dave Merdian. He lives no more than an hour or two south of you. As far as I'm concerned he is the "go to" guy on anything relating to the Hossfeld benders.

fl70,
Thanks for the kind words. Its no Shop Outfitter bender though...

[Dave Merdian]

Here is a hydraulic setup that could easly be fitted to a Hossfeld #1. One shot bender. I got the pic from American Bender.
Later,
Dave

[glen cowan]

Hossfeld #2 Hydraulics specs.

Here is a hydraulic setup that could easly be fitted to a Hossfeld #1. One shot bender. I got the pic from American Bender.
Later,
Dave

On your Hossfeld #2 Hydraulic setup. Can you tell me the dia. of the rod and the length of the cylinder to use and will a 1 gpm 5000 psi pump be way too much power? I'm thinking of putting a releif valve on so it drops pump pressure to around 800-1200 psi. Any info on this would be greatly appreciated. Glen

[Wyoming]

Sometimes Dave checks in on the hyd. bender posts, sometimes not. It best to shot him a PM and grab his attention. 5000 psi is nearly triple the setting used by the Hossfeld manufactured hyd. set-up. Easily cured with the relief valve...I'm using a 10K psi unt myself. You might have a problem with the 1 gpm rating on your hyd. pump being a bit slow on a long extension/large dia. cyclinder.

[Wyoming]

Glen, I'm seeing a bit of a problem on your question. The quote you used from Dave Merdian is in reference to a Hossfeld #1 bender and you are asking about a #2. That and the fact that Dave was providing information on a set-up he accessed from the American Bender site. Is it the #1 or #2 you wish info on, and one-shot or multi-position as Hossfeld designed? Easiest method to come up with the stroke length needed for the one-shot set-up is to pick out a mount location for the hyd. cyclinder, extend the bender arm full reach and measure the stroke needed to that location.

[Dave Merdian]

Hi Glenn,
The cylinder is 2" bore x 15" stroke. The recommended pressure setting is 1600 psi. This is for the Hossfeld #2 setup. I don't know what the size is for a one shot cylinder. I have been bending some 1-1/4" pipe and it takes about 400psi. I don't hardly ever look at the pressure gauge.
Later,
Dave

[Dave Merdian]

Here is a picture of the 1-1/4" pipe I have been bending.

[Wyoming]

Dave, whats the rotab go on? I see your lathe in the background. that a 14 X 40? Grizzly. If so, I have its white twin brother up at the shop.