Shopping isnt simple, particularly when youre talking about big ticket investment items like a new hydraulic press. Chances are, a great deal of thoughtful consideration and research will go into the process. Unlike car shopping, you cant try out a hydraulic press to see if it seems right for you. If youre thinking about the addition of a hydraulic press to your organization, before you go shopping you need to first ask the question, Whats really behind the sticker price? before making a final purchasing decision.
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A great many factors go into determining the final price of a hydraulic press. No doubt your team will want to complete a full cost-benefit analysis and in order to do that, youll need to know the criteria that factors into the pricing. Lets start with a list of some of the key considerations youll need to know more about in order to understand what truly drives the cost of a hydraulic press:
Bed size has nothing to do with twin, double, queen, or king but rather, the bed of your hydraulic press is a flat, stationary, machined surface that supports the bolster (a plate or structure mounted on the bed) on which your tooling is mounted and attached. You might assume that the larger the tonnage, the larger the bed but that is not always the case. You can actually have a hydraulic press built with larger table areas and beds or smaller than standard beds and in fact you can adjust the tonnage of a hydraulic press, quite easily, adding to its flexibility by tuning it to specific jobs.
The speed of operation required to make your cost-benefit analysis favourable is an important consideration and speed on a hydraulic press is different from that of a mechanical press. Youll also need to understand the importance of stroke depth accuracy, pressing zone, and the different tonnages required in different parts of the stroke.
Its important to realize that press deflection is normal to some degree. During pressing some deflection (or deforming) across the bed will occur with the most deflection occurring in the centre. To understand the amount, or the value of the deflection you have to consider the difference between the possible initial position without the load and the position during loading. Acceptable tolerance limits are once again a factor, as they are in any consideration of accuracy too.
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Press functionality is likely at or near the top of your list during the decision-making process and automation is at the core of press functionality. Automation improves running time, is cost- efficient, produces consistent quality across vast quantities of parts and frees up machine operators to assume other tasks.
Of course, accuracy is important but if you know anything about mold or tool making, or have ever seen a precision CNC grinding machine in action, youll know that what is considered accurate for some jobs might be deemed a scrap for another. Think about the use of the hydraulic press and whether you need precision or you have a little more wiggle room. Whats demanded of the machine (and its operator) from an accuracy point of view will factor into its cost.
This may well be a question for the accountants in the room. Obviously, the price of a new machine will be higher than that of a used one, but you may wish to factor in other important considerations such as: the cost of any retrofitting, the cost of potential repairs, the risk of foregoing certain features for the sake of price and whether replacement parts will even be readily accessible over its lifespan. You will also want to consider your budget and if there are any time constraints as the purchase and install of a new machine could take longer than buying used. There are other factors too, but weve blogged about them before. You can read that blog here. New or Used?
Now that you have a better idea of what you are shopping for, youll also have a more complete understanding of the rationale behind pricing these machines. They are robust, complex machines often producing intricate parts in a variety of industrial settings. While they may have significant upfront costs, you may in turn find even greater savings in reduced costs of manpower or through efficiencies gained as a result of increased speed and enhanced accuracy. At Macrodyne were happy to have a conversation with everyone involved in making critical decisions about the purchase and installation of a hydraulic press. Well make sure you have all the information you need, including a better understanding of whats behind that sticker price!
I agree with Stacy.
The math is super simple grade school volume of a cylinder...
If you don't have the inclination to do the math on your own, spend the thirty dollars and start with that book.
You're doing it backwards.
You start with the tonnage and ram speed you want, assume a pressure, that gives you fluid volume then pump and motor size.
psi is so low, you would have to use absolutely huge cylinders to get tonnage.
Absolutely huge cylinders leads to huge pumps and motors.
It's relatively cheaper to go up in tonnage by gong up in pressure. 2,000psi 2,500 psi or 3,000 psi is "normal"
2HP is so little power it will be useless.
Are you getting those specs from a commercially available hydraulic power pack ?
They are nfg for the purpose. Ram speed for a shop press vs forging press are dramatically different.
At the very least, go look at commercially available blacksmith presses and look at those specs.
then do the math on them to give yourself a starting point.
go back and read all the past press threads in shop talk, and the shoptalk archive.
Keeping a press "fairly cheap" is still $2,000
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