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I have looked at radial piston motors too. For that torque we would need a big unit. The whole device has to weigh less than 22kg...

I have found that the torque requirement is rather high at 15kNm. A gerotor will not be viable for this as it will have to be too big. Any other suggestions?

Hello Gents! Thanks for all of your help on many other topics! Next question: I am looking at novel ways to incorporate rotation onto a shaft using water under pressure. I have been interested in designing a gerotor motor that is energised by water at about 16MPa and with as little flow as...

Yep it is a lot of extra work, I think I am just cautious of forgetting to take something into account... Thanks

Hi Ted, Thanks, yes I am looking at a spring mount for the handle. I just need to work out how to design the spring correctly.. L

Hi there, Thanks for the input. Any more suggestions or spreadsheets that you use? Attached, See the matrix I may use in the future:http://files.engineering.com/getfile.aspx?folder=8b34b391-30ea-4821-919c-c658227f482d&file=Book2.xlsx

Hi, Well yes, part of the problem is that weighing each of the criteria like reliability, corrosion etc are all user inputs and therefore manipulated. Also when scoring each concept, the scores are related to the designers existing knowledge or lack thereof. It is also possible that the...

Hi there, I trust you all are having a good start to the new year! As a design engineer, I continuously have to look at new ways of designing components or products. I obviously have to take cost, weight, material, corrosion, reliability, performance etc. into account. I am familiar with...

Hi, Yes the piston has to push the water in the opposing chambers away, its complex. This is an existing device.

Hi Ted, There is another chamber further down the piston rod that is only pressurized when the piston is fully forward. This is because of the valve that is opened by the piston in the full forward position. What about the friction and counteractive forces that act against the piston? how do I...

Are we talking the same concept as Rotameters (variable area meter)? http://en.wikipedia.org/wiki/Rotameter

Ah yes, One can use the continuity equation in bernoulli's to get the pressure difference across the piston. If you have the flow rate, which I have! F=P.A so we can work out the force being exerted on the piston. Am I on the right track? Laurence

I think I have the mass flow rate around the piston but I don't have the pressure difference, its not easy to measure. Is there a law that states that the piston will move the same speed as the water in that cavity? I can't see that being true?? I do not know how the piston is continuing to...

Israelkk, Tell me, how do you calculate the pressure once you know the mass flow rate passing the piston? And what do you do then? Laurence

Thanks Ted, The hydraulic drill in question has a piston stroke of just under two inches however the pressurised section as per drawing is only about half an inch. Do you know of any reference material I can have a look at that will fully explain the hydraulic workings? Who don't hydraulic...

Thanks for the replies! To clarify: In the hydraulic case, the piston physically closes a valve which then allows water to flow into the front of the piston making it return. I am still unsure how this works because the valve is only open for a very short amount of time. For the pneumatic...

Hi there, How can the force be related to pressure at the end of the stroke when the water is running over the piston and being exhausted? This design is used to turn ratched a rotor, however it is also being used for the piston in a percussion drill. Laurence

Hi there, I need to understand something that I hope you can help with! I work with water powered machinery as well as pneumatic machinery and I have found that there are specific designs required for each instance. Obviously this is due to the incompressibility of water compared to air's...

Ah excellent!!! I am going to order the T56 - it looks perfect! I hope we can make it work in the extreme environment of mining! Thanks! PS. if anything else comes to mind, please let me know!!!!

Hi itsmoked, Thanks, well we are looking for something cost effective no more than $120 each if possible. We would install them into about 1200 drills per year. I suppose we can modify the drill switch to activate the time logger. I think pressure switching may be better however more...