I need a hydraulic power pack for a press...?

rfrink

rfrink

Joined
Aug 1, 2000
Messages
863
Can anyone recommend a system for me? I'm building a hyd press.

I need a pump, motor, tank..press valve..and a cylinder control valve. 3 phase electric is OK.

I've looked through some catalogues and Northern tool's web site...but have become frustrated with trying to figure out the details.

any help?

-Rob
 
Hi Rob,
Consider getting a copy of Dr. Batson's press manual from the ABS or Don Fogg. It'll likely answer all your component questions and probably more that you haven't thought of.

Good luck with the project, Craig
 
Hi Rob

There are a lot of variables that come into play here. You need to start with the amount of force you want. This will determine your cylinder size for the pressure you want to run (usually between 2000 and 3000psi). Next you need to determine how fast you want your press to move and this will determine the flow of your pump. Lastly, you use the pressure and flow to determine the HP needed to run everything.

Usually people want a lot of force and want the press to move fast, but need to use a smaller HP motor because of electrical limitations. The trade off here is a 2 stage pump where the first stage is high flow low pressure and the second stage is high pressure low flow. It is a compromise of components to get good results.

Surplus center and Baum hydraulics both have hydraulic power units complete for sale. They also have online calculators that will help you figure force, speed and HP requiremnets. Take a look at the calculators and see if this helps clear some things up.

Another source is Enerpac. They sell complete units with pressures up to 10000 psi but have low flow which means slow travel. These are the same units they use on their presses and porta powers.

If you can give us some specifics on how many tons of force you want, speed you want, and HP capabilities your shop can handle, we may be able to help more.

Brian
 
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Rob I put this http://www.grainger.com/Grainger/items/5PG19 one on my press and it does a fantastic job. I have a six and a half inch cylinder and get about three inches a second of movement. it is a little spendy but the convenience of having everthing in one package is great, It is also much quieter than the exposed pump model that I have been around
 
Farmer Phil said:
No fair! What about the rest of us blokes?
Click to expand...

Hello Phil,

My current format would create more questions than answers without a phone call. When I get it sorted out, I'll be sure to post. I'm in the process of a build right now. Taking pics along the way so will post them all up when I'm more organized.

Take care,

Eric
 
I'm starting to figure this out.

George and Eric, Thanks a million for the info. I think I'm going to go the route that Bill posted. It's a lot more expensive...but the integral package is really attractive for space ...and it'll be a real time saver for me in setting it up.

$1800 for one of these...yikes! I'm not sure this is what I'm going to do but it sure is convinient. I can just run down the street and pick it up in "will call".

6W644.JPG


Here's more background on my application.

This press will be used for broaching keyways in KMG wheels, and disks. Currently they are being done by hand in a fancy "H" frame arbor press.

I'm just going to put a hyd cylinder on the press and remove the mechanical gear/ratchet stuff. These broaches are 24" long or so...so a long working stroke is needed. I have a 2-1/2" bore hyd cylinder with a 30" stroke that will be used.

The braoach engineers told me that the braoching tonnage is only about 2200lbs of force. This is much lower than I imagined....and comes out to be about 450 psi at the bare minimum. So a 1200 psi system will be more than enough. A 2 stage pump will be nice for the non-working ram speed...but since my working stroke is so long....24"....I don't want the pump to drop into the high pressure mode while broaching...and slowing everything down to a snails pace. So I'm trying to understand just how fast my ram speed will be at different flow rates.

...back to the books...ergh!

-Rob
 
That helps a LOT, most of our suggestions have been centered around building a forging press, and your really looking for a powered shop press

Look at these options:
http://www.surpluscenter.com/sort.asp?UID=2009031812164856&catname=hydraulic&keyword=HPPA

all AC, single phase fully contained power packs

their not hefty enough for a forging press but should do well for what you need

rfrink said:
I'm starting to figure this out.

George and Eric, Thanks a million for the info. I think I'm going to go the route that Bill posted. It's a lot more expensive...but the integral package is really attractive for space ...and it'll be a real time saver for me in setting it up.

$1800 for one of these...yikes! I'm not sure this is what I'm going to do but it sure is convinient. I can just run down the street and pick it up in "will call".

6W644.JPG


Here's more background on my application.

This press will be used for broaching keyways in KMG wheels, and disks. Currently they are being done by hand in a fancy "H" frame arbor press.

I'm just going to put a hyd cylinder on the press and remove the mechanical gear/ratchet stuff. These broaches are 24" long or so...so a long working stroke is needed. I have a 2-1/2" bore hyd cylinder with a 30" stroke that will be used.

The braoach engineers told me that the braoching tonnage is only about 2200lbs of force. This is much lower than I imagined....and comes out to be about 450 psi at the bare minimum. So a 1200 psi system will be more than enough. A 2 stage pump will be nice for the non-working ram speed...but since my working stroke is so long....24"....I don't want the pump to drop into the high pressure mode while broaching...and slowing everything down to a snails pace. So I'm trying to understand just how fast my ram speed will be at different flow rates.

...back to the books...ergh!

-Rob
Click to expand...
 
rfrink said:
Yes!! yes!!! that's a beauty!!

p9-7139C.jpg


http://www.surpluscenter.com/item.asp?UID=2009031812164856&item=9-7139&catname=hydraulic

2.25 GPM @ 2,000psi. ...more than enough pressure.

I wonder what ram speed it'll have on my 2-1/2" bore cylinder?

You think it's industrial enough? I want something that I'll never need to worry about once I set it up. Sure can't beat the price.

Good find!!

-Rob
Click to expand...

Pi x R squared = the area of a circle so Pi x 1.25 Sq = 4.908739

well, you have 4.908739 Sq Inches with a 2.5" Bore x 2000 PSI = 9817 Lb at the ram

2.25 GPM you have an internal volume of (assuming 24" stroke length) of 117.8097 Cubic inches or .51 Gallon

One gallon = 231 Cubic Inches (thank you google) so that pump does 577.5 Cubic inches per minute
577.5 / 60 = cubic inches per second 9.625

4.908739 Cubic inches will move your 2.5" cylinder for 1 Inch of travel

9.625/4.908739 = 1.9607

you will have 1.9 In/Second travel which will do your 24" stroke in about 13 seconds.

(math is fun)
 
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rfrink said:
Yes!! yes!!! that's a beauty!!

p9-7139C.jpg


http://www.surpluscenter.com/item.asp?UID=2009031812164856&item=9-7139&catname=hydraulic

2.25 GPM @ 2,000psi. ...more than enough pressure.

I wonder what ram speed it'll have on my 2-1/2" bore cylinder?

You think it's industrial enough? I want something that I'll never need to worry about once I set it up. Sure can't beat the price.

Good find!!

-Rob
Click to expand...

Rob
This should work fine for you. We use hundreds of these on our lifts in the auto shops to lift the cars.

Mike
 
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