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miles&Jules
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Joined: 19 May 2010
Posts: 3955
Location: ipswich QLD


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http://www.hobbyking.com/hobbyking/store/__48783__A123_3_3V_Lithium_Ion_2500mAh_Single_Cell_Battery.html

thats what they have now….what do you need em for anyway?
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Post Fri Jul 17, 2015 6:18 pm 
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timnew



Joined: 19 Jun 2015
Posts: 48


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they used to have lifepo4 a123 cells now they are trying to pass these off as the same thing.

Building a 6s pack. going to try out the hobbyking 4500mah 6s2p pack first nd if its not enough capacity ill build 6s3p packs from a123s

Post Wed Jul 29, 2015 9:28 am 
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DumHed
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Joined: 29 Jun 2004
Posts: 1218
Location: Sydney


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based on the voltage specs they are still LiFePO4 chemistry.

Lithium Ion covers all types
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Post Wed Jul 29, 2015 10:05 am 
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timnew



Joined: 19 Jun 2015
Posts: 48


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Strange why they wouldn't advertise lifepo4

The max charge voltage dont add up?

If people charge them on lithium ion voltages itl destroy the cell wont it the label could cuase problems.

Post Wed Jul 29, 2015 11:07 am 
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DumHed
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Joined: 29 Jun 2004
Posts: 1218
Location: Sydney


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Most LiFePO4 cells seem to have an absolute max rating of 4.25v

Standard charge is 3.65v or so.
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Post Wed Jul 29, 2015 11:22 am 
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timnew



Joined: 19 Jun 2015
Posts: 48


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Hobby Kings response

GPS Adam11:38:33 am AEST
These cells are also a mystery to me as all I have to go by is the listing, I do not have access to test the actual voltage. I recommend against buying them at this time. I will send a not to both or Product team and Web Team to take care of this ASAP.

Post Wed Jul 29, 2015 11:39 am 
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andrew



Joined: 16 Jun 2004
Posts: 3105
Location: Castle Hill, Sydney. N.S.W


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Hey,

Has anybody got a smaller whyachi switch for sale or something similar

Trying to get the mock testbed for new warning driving by end of week and the whyachi switch i have is MASSIVE and doesnt allow me to make it as compact as id like.

Part of me is tempted to make my own but id rather not risk it and go with something that guarantee works.

If not If anybody knows how to make one thats reliable and tiny and can handle two hammerdrill motors on 6 cell i wouldnt say no.

Thanks
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Post Mon Aug 10, 2015 4:33 pm 
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Ellis



Joined: 21 Jul 2012
Posts: 129
Location: Shopshire, England


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Use a link! Smile
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Post Mon Aug 10, 2015 9:01 pm 
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Glen
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Joined: 16 Jun 2004
Posts: 9464
Location: Where you least expect


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Yeh just use an EC5 or XT60, they wont come out.
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Post Mon Aug 10, 2015 9:30 pm 
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Knightrous
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Joined: 15 Jun 2004
Posts: 8467
Location: NSW


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Get Miles to 3D print you a bolt based switch.
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Post Mon Aug 10, 2015 9:57 pm 
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Valen
Experienced Roboteer


Joined: 07 Jul 2004
Posts: 4424
Location: Sydney


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If you don't want a removable link you can solder a nut onto one side of some PCB, then put a socket head cap screw through from the other side to make the connection.

It's worked pretty well for NC, I think using M6 bolt, I then wrapped it all in kapton.
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Post Tue Aug 11, 2015 8:12 am 
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dyrodium
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Joined: 24 Aug 2004
Posts: 6475
Location: Sydney


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Hey Dudes,

Had an UP Mini come into the shop for sale as a used machine - looks pretty much untouched, I think they didn't know how to 3D Model and just gave up, maybe 100g material run through it (literally).

Price is $600 ONO plus delivery if anyone's interested. It would be just on the tail end of its warranty (4mths or so left).
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Post Thu Sep 24, 2015 3:31 pm 
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Philip
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Joined: 18 Jun 2004
Posts: 3823
Location: Queensland near Brisbane


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Does anyone know if hollow axles are available? I am looking for an ID 1/2" axle or steel bush or spacer or whatever that would go over my 1/2" OD hub to extend the hub out to a support bearing. Otherwise I would just make another hub from scratch.
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Post Sun Dec 06, 2015 12:50 pm 
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Nick
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Joined: 16 Jun 2004
Posts: 11713
Location: Sydney, NSW


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What OD does the extension need to be? It sounds like a locking collar might do the trick:


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Post Sun Dec 06, 2015 2:31 pm 
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Philip
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Joined: 18 Jun 2004
Posts: 3823
Location: Queensland near Brisbane


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The OD can be any standard bearing size. The length needs to be the width of thewheel and bearing. Maybe 50 mm.
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Post Sun Dec 06, 2015 9:01 pm 
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