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popo00
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Join Date: Sep 2017
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Which Eccentric Mechanism to Choose for My Tool?

09/29/2017 2:20 AM

Hi folks, I am using a hand driven pump like the yellow one on the picture . I want to use an engine for that pump instead of using my hands and a pump arm.

I will disassamble the long arm from my yellow pump and will want to transmit engine power to the piston.

Engine power is 0.6 kW

rotation of my engine is 50 per minute.

Shaft on the engine will need to be able to rotate under load approx 400 kG ( that is what the maximum weight needed to be put on the piston)

will the engine 0.4 kW ( 50 rpm) be strong enough for that job ?

Can you please advice which way is best for transmission of the engine power to the piston ? I have few example below, but maybe there is a better way ?

THank you for help !

Frank
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redfred
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#102
In reply to #100
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Re: Which Eccentric Mechanism to Choose for My Tool?

11/28/2017 9:42 PM

In the collection of videos you link to I think you'll find the scotch yoke a much easier and smooth running design. That's what I was commenting on.

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GW
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#101
In reply to #98
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Re: Which Eccentric Mechanism to Choose for My Tool?

11/28/2017 7:10 PM

Try just the cam to start with.

The fancy follower you have drawn has to be machined to close tolerances to work smoothly. It also needs a guide to slide in - more precision machining. A connecting rod with commercially available bearings will be much easier to make.

The cam and follower should be hardened steel. Try using drill rod (W1 tool steel), machine your cam, then harden. You may need to grind after hardening to get a smooth finish. It should wear well. (W1 when hardened cannot be cut with a file!)
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popo00
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#103

Re: Which Eccentric Mechanism to Choose for My Tool?

11/29/2017 5:47 PM

so I will make it with bearing.
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GW
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#104
In reply to #103

Re: Which Eccentric Mechanism to Choose for My Tool?

11/29/2017 11:12 PM

With a yoke you will need guides - I would suggest both top and bottom.

If you can find the bearing, you could use a spring return on the piston and use the bearing like a roller cam.
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popo00
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#105
In reply to #103

Re: Which Eccentric Mechanism to Choose for My Tool?

11/30/2017 2:19 PM

This one I made with bearing and it works like wonder. Its quite, and gentle.

500 bars easly and fast available. This is what I meant to !

Thank you folks for hepling !
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GW
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#106
In reply to #105

Re: Which Eccentric Mechanism to Choose for My Tool?

12/02/2017 11:22 PM

Great!

Can you give us a few more pictures?
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popo00
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#107
In reply to #106

Re: Which Eccentric Mechanism to Choose for My Tool?

12/03/2017 2:27 AM

here is a sketch.

link to the movie :

https://photos.app.goo.gl/mj7UIn9aZVQBKOrf2

I would still change two things : make a frame for motor to be more stiffer ( it bends a bit now when pumping on high power)

and make that steel element ( in which bearing moves) smaller size, very precise so bearing would be more tight in that. That would make it even more silent, I guess.
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GW
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#108
In reply to #107

Re: Which Eccentric Mechanism to Choose for My Tool?

12/03/2017 12:45 PM

You may be able to change the yoke to a connecting rod. Tolerances would be easier to hold because it is just a round hole. The yoke is going to "want" to change shape.
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popo00
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#109
In reply to #108

Re: Which Eccentric Mechanism to Choose for My Tool?

12/03/2017 2:08 PM

please give me an image of what you mean...
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popo00
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#110
In reply to #108

Re: Which Eccentric Mechanism to Choose for My Tool?

12/03/2017 4:12 PM

so you mean the basic one ...yes it would be better....but the frame I already made ...there isnt much space to make a rod long....so the side loading on the piston would be a problem
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GW
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#111
In reply to #110

Re: Which Eccentric Mechanism to Choose for My Tool?

12/04/2017 12:55 PM

.25 inch off set with a 2.8 inch "rod" is only +/- 5deg.

May be long enough ---- considering the large side load the high lift cam was delivering without damage(?).
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popo00
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#112
In reply to #111

Re: Which Eccentric Mechanism to Choose for My Tool?

12/04/2017 2:20 PM

I may try it ;) so it should be almost perfect...and its funny but its the simplest one...and few people suggested me that...and even I had a picture of crank, in my first post ...I dont know why I didnt use it and insted I went for following cam...it took me ages to find out that bearing is a must in that mechanism.

600 bars oil preassure in one minute. That is very good. I have asked at few shops specialized in hydraulic pomps, and only one of them had an offer for a oil pomp that needs air preassure compressor...1200 dollars. My motor was 100 dollars, and steel pieces and cutting 150 dollars.
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GW
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#113
In reply to #112

Re: Which Eccentric Mechanism to Choose for My Tool?

01/22/2018 11:49 PM

Did you do any more modifications?

I have been wondering how the bearing on the gear reducer has been standing up. That is a significant radial load for a typical reducer design for minimal radial forces.
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popo00
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#114

Re: Which Eccentric Mechanism to Choose for My Tool?

02/22/2018 12:20 PM

So my pump with the motor and the yoke I build, eventually broke down. I was using it for last 3 years , and after I put an motor , it was working hards...and coulld reach enough presure any more...

So I purchase power pack, oli pomp...o man... This is so much faster !

But it was fun to learn and build that eccentric mechanism :)

All best folks :)
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GW
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#115
In reply to #114

Re: Which Eccentric Mechanism to Choose for My Tool?

02/22/2018 1:18 PM

Is it quiet?
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