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Old 10-25-2013, 07:41 PM
packetfire packetfire is offline
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Default Novice with a Uni-Punch and a Habor Freight 6-ton press

I am not a metal worker, but I have a need to punch some aluminum ranging from 1/16th to 3/8ths with a small shape-punch, total punch circumference less than 1 inch. I will be punching hundreds, perhaps thousands of holes.

So, I have ordered a used Uni-Punch AJ 1 1/2-inch rig, and some off-the-shelf tooling is being provided by a vendor who knows Uni-Punches well.

This leaves something to apply some pressure. I did the usual math, and 6 tons is likely overkill, and the Harbor Freight 6-ton press was on sale for $69.00.

A few things that would be nice would include:

a) Some way to rig a pulley, foot pedal and spring return for the bottle-jack handle that applies the pressure.

b) Maybe another foot-pedal to operate the release valve on the bottle jack?

c) Some way to assemble the press so that it remains "square", for example, has any one assembled the thing, squared it up, and then drilled holes for cotter pins to keep the various joints from slipping out of "square"?

d) Or should the Harbor Freight press be returned as "useless", and something else be purchased in its place?

Can anyone point me in the right direction?
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Old 10-25-2013, 07:49 PM
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LKeithR LKeithR is offline
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Your big thing is going to be time. If you really do end up punching thousands of holes pulling that jack handle is going to get old in a hurry. Your tonnage is low so some sort of air over hydraulic power unit would probably be a good choice...
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Old 10-25-2013, 07:52 PM
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Welcome to the site.

Cant say if it will fit in the press you have, HF should also have Air operated bottle-jacks you may want to consider.

Then you also need an air compressor.
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Old 10-25-2013, 09:10 PM
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I'd return the 6 ton and buy the 20 ton floor unit and a 20 ton air over hydraulic jack. If you are doing thousands of holes the ~$250 you will spend (less if you buy seperate and use 20% off coupouns ) will be well worth it
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Old 10-25-2013, 10:11 PM
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Hmmm, hundreds and thousands of holes with a hydraulic jack? I'd be real concerned with cycle time.

If 6 t is overkill, what is needed to do the punching? If the forces are within reason, a mechanical system like a fly press would be faster.

For ease of operation, a slight modification to the bleed screw ( big knob to make releasing quicker and easier) on an air over hyd jack would make the operation easy, just time consuming. If 6 t is over kill, 20 T is way overkill, but the 20T air over units can be had for under $100.

The other factor is that a compressor purchase would inflate the cost. IIRC, a 20 t air over hyd jack needs 4 cfm for near continuous use like what you'll needs for the 100s and 1000s of holes.
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Old 10-26-2013, 07:50 AM
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+1 on the air over setup. I would use taper pins to preserve alignment, (frame and die's) they better resist shear forces that would try to push the frame out of square. (It's gonna be tough to maintain a tight setup and punch alignment with so many pieces. all in a pile.

RED
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Old 10-26-2013, 05:16 PM
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I have a 3 ton punch press that would work wonders on something like that..

As for the air setup. It's going to be faster than hand work but still going to take you a really long time.

Is there a way to get a multi punch setup? Then you could utilize the 20tons of force and punch out a few at a time..
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Old 10-27-2013, 01:42 PM
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Quote:
Originally Posted by RED caddy View Post
+1 on the air over setup. I would use taper pins to preserve alignment, (frame and die's) they better resist shear forces that would try to push the frame out of square.
RED
+1 on this. 12T air/hyd. press with some mods for efficiency. Mount dies in a frame with pins for alignment and maybe some springs to help release. (pics are overkill examples) This should work good for 1/8" and under.

1"dia. x 3/8" is a pretty stout piece to be punching--how many of those will you be doing? Maybe consider drilling them or finding a shop to do them for you. More info is needed...
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