MG996R or HK15298B Finger servos?

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Steve Wagg

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Nov 9, 2015, 3:52:57 PM11/9/15
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Hi All,

I'm looking at building up some hands to start with. I want to spend wisely and try to keep the cost down but I don't want to buy twice! For the finger servo's is there a lot of benefit going for the HK15298B over the MG996R servos?  They are over double the price so I could buy enough servos for both hands with change compared to just a single hand. Has anyone experimented with both?

Thanks,

Steve

Marten de Groot

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Nov 11, 2015, 1:37:47 AM11/11/15
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Hi Steve,

I'm getting good results with the MG996R servo's including a spring.
http://www.hobbyking.com/hobbyking/store/__6221__Towerdpro_MG996R_10kg_Servo_10kg_0_20sec_55g.html
Same servo with more torque:
http://www.hobbyking.com/hobbyking/store/__6222__TowerPro_MG946R_12kg_0_20sec_55g.html

The spring is there to use it like a servo-saver and I've designed a other servo-pulley.
http://www.thingiverse.com/thing:1052776
(a update will coming soon)
I hope this or next week to shoot a video and will share this.

Regards,
Marten

gael langevin

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Nov 11, 2015, 4:17:04 AM11/11/15
to Marten de Groot, InMoov
Hello,
The MG996r are okay and they give good results as long at they don't stay too long under pressure. It all depends on what you want to do. I have ended up replacing all my MG995 and MG996 by the HK15298B for the finger actuation.

Gael Langevin
Creator of InMoov
InMoov Robot
@inmoov



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Steve Wagg

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Nov 12, 2015, 3:37:56 AM11/12/15
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Thanks all.. 

I went and ordered 5 off HK15298B's in the end. I will save up for the other hand :-)  

Slowly printing things off and I should have a nearly completed left hand by the end of the week. Great project !!

Maryam Yahya

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Mar 22, 2016, 3:50:22 AM3/22/16
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Hi,
I am wondering if HK15298B servo are able to achieve full movement of the fingers because it have 90 degree rotation instead of 180 degree on MG996R?

Maryam.

gael langevin

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Mar 25, 2016, 3:11:40 PM3/25/16
to Maryam Yahya, InMoov, Marten de Groot
Hi,
The diameter of the pulley is taking the 90 degree rotation in account. The majeure finger is missing a little bit of rotation to do a full open and close gesture. Therefore it is very important to set the hand cover and the finger covers to minimise the full extension of the fingers.

Gael Langevin
Creator of InMoov
InMoov Robot
@inmoov



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Ricardo Taoni Xavier

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Apr 1, 2016, 9:03:20 AM4/1/16
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Bom dia Steve, trabalho com o MG996 na minha handinmoov a dois anos e ate agora não tive nenhum problema. Mesmo meu sistema sendo testado e analisado praticamente todos os dias, estou no Brasil e comprei eles por importação. :) 

Em segunda-feira, 9 de novembro de 2015 18:52:57 UTC-2, Steve Wagg escreveu:

Todas oi, eu estou olhando para a construção de algumas mãos para começar. Eu quero gastar sabiamente e tentar manter o custo baixo, mas eu não quero comprar duas vezes! Para o servo dedo de que há uma série de benefícios indo para o HK15298B ao longo dos servos MG996R? Eles são mais de duas vezes o preço que eu pudesse comprar servos suficientes para ambas as mãos com mudança em comparação com apenas uma única mão. Alguém já experimentou com ambos?


Obrigado,

Steve

Bryan Burman

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Apr 2, 2016, 8:27:15 AM4/2/16
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I'm starting to get acquanited with servos myself and am starting on the index finger. From what I understand, if you pull a Tower Pro servo apart, the internal connections are weak and not protected against vibration. Constant, repetitive motion would therefore dramatically decrease the life of the servo. It depends on your application, I guess, but I purchased a Hobby King HK15298 for the project since overall development alone will probably exercise the servo quite a bit.

Mats Önnerby

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Apr 2, 2016, 11:21:26 AM4/2/16
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Since you open up the servo(s) you can change weak cables for better ones, and also protect the connections from vibrations by putting a little glue on then using a glue gun.

Vasily Denegin

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Jun 15, 2016, 6:09:04 PM6/15/16
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Hi Community.

I found the cheapest MG995 Pro with metal gears and still 13 kg tongue on Amazon. I am happy with those because instead of 9 euro you get those for 5,59 euro (or a pack of 4 for 24.99 eu)
here are the links


****BUT *** those are MG995 Pro!!! so they are a bit higher (3 mm) than usual servos.
Good news: I redesigned the entire SERVO BED to fit those all inside (took me 4 days to make them), printable without supports. I can pass it over with pleasure.... you will need to have a soldering gun to cut the bottom of forearm reinforcing bridges.

Enjoy, Vasily (Austria)

Sam Clare

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Jun 22, 2016, 4:12:13 AM6/22/16
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Vasily,

Please could you send me the .stl for the servo bed that you designed.  :)  Also if you have any advice on using the MG996R for the hand and forearm that would be great.

I look forward to hearing from you.

Cheers,

Sam

Lorenzo TartaPise

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Mar 21, 2018, 9:11:49 AM3/21/18
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Hi sir, I know it's kind of old post I would love to have your redesigned servo bed. Could you please send them to me?

Marten de Groot

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Mar 21, 2018, 6:41:35 PM3/21/18
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Standard ServoBed for HK15298B sized servo's: https://www.thingiverse.com/thing:1036300

I've redesigned the Wrist part and ServoBed to use smaller servo's: https://www.thingiverse.com/thing:1824042
To use my option with HK15298B sized servo's, you can use this "remix": https://www.thingiverse.com/thing:1847641


Regards,
Marten
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