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Hydraulic Presses or Electro-Mechanical Presses
Mechanical Press Simulator
Remanufactured Presses

 


Why buy a Remanufactured Press?

Answers to our most commonly asked questions.



What is the difference in a reconditioned press and a remanufactured one?
We sometimes are able to sell a used press as a reconditioned unit if it is in good condition when we obtain it. The press is still partially or completely disassembled and parts replaced as necessary. All motions are brought into spec and the housing is sealed and painted.

 

These presses many times are a very good value. The downside is that most of the presses we obtain are not in good enough condition, and must be remanufactured.
Remanufactured presses have long been the specialty of Precision Compacting Technologies, Inc. We have a description of what is done to each model available if you request it, but in short, we replace or re-machine everything to return the press back to as new condition. You can expect new press performance and longevity, plus up to one years warranty.

Why are good used DORST and new ATLAS presses so expensive?
These presses feature heavy cast housings and enclosed gear boxes that are internally lubricated. Their value lies in the fact they are much more accurate and last longer than welded frame presses. Many welded frame presses use rods to transmit force for ejection from the main drive, providing substantially less available ejection force.
Because these cast housing presses last longer, and are capable of higher speed and accuracy, the overall cost of production per part is usually less than that of a much cheaper machine!

Combine this with the fact that they will make parts that literally could not be made on a welded frame machine, and you can understand their value.  We have sold machines to customers who have completely eliminated second operation machining because they were able to hold part height within .001 inch in pressing.  I guess the best way to sum this up is to apply the old adage "You get what you pay for".

Why canít my company rebuild our own presses and save money?
This is one of our most frequently asked questions. We would be not only arrogant, but stupid, to answer this with anything other than "you can"... but at what cost?
The problem is that not only are these presses very complex mechanically, but no two are exactly alike.

The reason for this is that unlike most cars or machine tools such as a lathe or milling machine, they were never mass produced in sufficient quantity to be able produce "bolt on and work" standard parts. Also, after being rebuilt, many shafts and journals will be slightly undersized requiring fitting of undersize bearings.
The hardest thing in a remanufacture is to restore standard motions and accuracy to the press. Over the years we have developed hundreds of special tools, fixtures, and documented procedures to insure consistent quality in our remanufactured presses. We have, along with our sister company in Germany, successfully remanufactured over 650 DORST presses over the last 18 years.

One example of "a rebuild gone bad" we have seen the results of many times is the failure to properly fit the prepress wedge on a DORST toggle press.  Without getting into the full workings of this type of machine, let me explain that this wedge sits in the center of the press main traverse, which, at the bottom of the pressing stroke, pushes the wedge forward and transforms this movement into prepress motion. The wedge rests on a pillar attached to the housing with the top of it contacting the lower side of the main traverse.

The problem occurs when someone attempts to rebuild the machine and does not properly fit the wedge to its mating parts. If perfect angular alignment is not achieved and the wedge is captured instead of being propelled forward, full tonnage is applied to it locking up the press, and many times breaking the main housing.  Even if a cautious mechanic decides to leave this area alone and put in new bushings and bearings, this relationship will be altered ,with the same results possible.

What is the advantage of a new electrical panel ?
Safety, and enhanced control over process are the main reasons for updating to a modern control system. The great thing about modern control systems is that they can enhance the performance of these excellent old presses to rival anything built today, paying for themselves in savings in broken tools and increased production rates very quickly.

Why do I need a Digital Tonnage Monitor?
This is one of the most useful and money saving options that you can add to your press. If set up properly, it saves tooling, protects the press from damage and provides valuable information in real time that may be recorded.  But not all tonnage monitors are created equal, most of the units available are not fast enough or accurate enough as installed to give satisfactory service on a compacting press. The ability to read an out of normal press curve pressure spike before press position at less than maximum peak pressure is what you need to save tools.

What is a Programmable Limit Switch?
The Programmable Limit Switch breaks the pressing cycle up into 360 degrees allowing the user to turn systems on and off during the pressing cycle as needed. These systems would include, but are not limited to, top punch hold down, dwell time, light curtain muting, pick off devices, and interfacing with the tonnage monitor for early tonnage warning.

What is a Triple Microprocessor Clutch Control?
This unit features three identical microprocessor boards reading the same information for redundancy.  It also monitors the braking speed of the press and alerts the operator in case of brake wear or failure.
 


 

 

Precision Compacting Technologies
12182 Peach Orchard Road, Bentonville, AR 72712
 Phone: 479-271-0032 | FAX: 479-271-7180
sales@precisioncompactingtech.com

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