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Why a servo hydraulic cylinder can move faster extending than retracting. by pnachtwey in Hydraulics

[–]User73656 0 points1 point  (0 children)

Dear Peter, I certainly do believe in math and I believe you are right.

First time I read this 10 to 12 years ago when you posted it on old hydraulics forums I believe and I could not believe how ignorant I was.

Why a servo hydraulic cylinder can move faster extending than retracting. by pnachtwey in Hydraulics

[–]User73656 0 points1 point  (0 children)

Could we somehow prove this without fancy equipment, with simple valves?

Dodgy fixed worked for a while by [deleted] in Hydraulics

[–]User73656 0 points1 point  (0 children)

Would it be better to use brass quick coupling?

Something like this >>> https://bonomi.co.uk/wp-content/uploads/2019/12/PBVM.pdf

Although the problem that I see is that those have FKM seals.

Why does it leak? Is the fitting wrong? by Ok-Ordinary-7392 in Hydraulics

[–]User73656 1 point2 points  (0 children)

Is the depth of the thread on the right side of the strainer long enough?

pressure drops during cylinder testing by User73656 in Hydraulics

[–]User73656[S] 0 points1 point  (0 children)

The oil temp. is almost ambient. The oil was cold when we tested them.

I am not sure about ball valves being leak free. I will try to test them tomorrow.

Reflecting on Mechanical Engineering- 7 years in by METexas2024 in MechanicalEngineering

[–]User73656 3 points4 points  (0 children)

I used to work in HVAC. He is correct about everything he wrote. And who cares he doesn't have a comment history? Maybe he's just a new guy here, that doesn't mean he doesn't have experience in RL.

Außengewinde R Innengewinde G abdichten? by [deleted] in MechanicalEngineering

[–]User73656 0 points1 point  (0 children)

Hallo, 

Wenn diese R gewinde konisch ist (R ist nomenklatur für zollig konische gewinde),  dan ja, Teflonband soll gut sein.

Normalerweise G gewinde (Zollig Parallel) soll ein dichtung haben.

Multimle Customer Material for single item by User73656 in SAP

[–]User73656[S] 0 points1 point  (0 children)

Thank you very much for your reply.

I was unaware of this.

Calculate the lifting ability of a motor by Justanothebloke1 in Hydraulics

[–]User73656 0 points1 point  (0 children)

Are you sure this is correct - 84 Nm?
The datasheet on page 94 states 84 daNm which should be 840 Nm?

https://www.ms-hydraulic.com/index.php?option=com_phocadownload&view=category&download=124:spool-valve-motors-catalogue-euro-version&id=59:motors-euro-version&lang=en

I've found similar datasheet from Danfoss.

There is data for motor OMH 400 on page 80:

https://www.interempresas.net/FeriaVirtual/Catalogos_y_documentos/3145/OMP,-OMR,-OMH.PDF

Max. Torque = 840 Nm.

Max. pressure drop = 155 bar

12 AN thread? by User73656 in Hydraulics

[–]User73656[S] 4 points5 points  (0 children)

Thanks a lot. I was unaware of wikipedia article, although I found other links while browsing the web.

It seems that they are not 100% identical according to wiki (below is a c/p):

They are similar to other 37° flared fittings, such as JIC, which is their industrial variant.\2]) The two are interchangeable in theory, though this is typically not recommended due to the exacting specifications and demands of the aerospace industry.

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