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Search took 0.03 seconds. search: Posts Made By: Mk.32
Forum: Electrical 28-07-2016, 19:10
Replies: 30
Views: 2,840
Posted By Mk.32
Re: Use of Lithium Iron Phosphate (LiFePO4) batteries in place of Lead Acid for FRC r

The types of battery OP linked has internal protections and a fuse (in this case a 25amp internal one) that keeps it pretty safe.

Like i said LiFepo4 is safer then LiPo but I still wouldn't trust...
Forum: Electrical 28-07-2016, 18:57
Replies: 30
Views: 2,840
Posted By Mk.32
Re: Use of Lithium Iron Phosphate (LiFePO4) batteries in place of Lead Acid for FRC r

I have personally poked holes in most of them....

A123s are fairly safe, some other Lifepo4's are not as much but when they vent they vent. https://www.youtube.com/watch?v=EMARDvMz62A

The pouch...
Forum: Electrical 28-07-2016, 17:25
Replies: 30
Views: 2,840
Posted By Mk.32
Re: Use of Lithium Iron Phosphate (LiFePO4) batteries in place of Lead Acid for FRC r

All the downsides apply to LIFEPO4 as much as any other lithium battery, the LiFepo4 stuff is probably safer when it goes off compared to a LiPo but it's still a pretty big hazard...

I'm all game...
Forum: Electrical 28-07-2016, 16:03
Replies: 30
Views: 2,840
Posted By Mk.32
Re: Use of Lithium Iron Phosphate (LiFePO4) batteries in place of Lead Acid for FRC r

LiFEPO4 and Lithium Ion 18650 cells and such are not generally rated with large output capacity with some exceptions. One being the A123 26550 cell with an insane 70amp output. (i'm building a pack...
Forum: Electrical 28-07-2016, 03:08
Replies: 30
Views: 2,840
Posted By Mk.32
Re: Use of Lithium Iron Phosphate (LiFePO4) batteries in place of Lead Acid for FRC r

There's a few reasons why first doesn't use Lithium batteries and it really isn't surprising. I work as a engineer in the drone industry so I've gotten pretty comfy with the world of lithium...
Forum: Technical Discussion 08-06-2016, 17:54
Replies: 178
Views: 18,608
Posted By Mk.32
Re: What COTS parts would you like to see?

I have listed both model numbers for the disk and caliper: BRK-512 and BRK-480L. You should find both parts on the website. The caliper uses a regular old bike cable.

Heh.. ironically this was an...
Forum: Technical Discussion 08-06-2016, 07:22
Replies: 178
Views: 18,608
Posted By Mk.32
Re: What COTS parts would you like to see?

Discs brake you want eh?
https://electricscooterparts.com/discbrakes.html

I learned that BRK-512 works with BRK-480L and has a hole pattern that is close enough to work with the AM 1.875in hole...
Forum: Technical Discussion 03-06-2016, 17:10
Replies: 23
Views: 3,405
Posted By Mk.32
Re: Off season T-Shirt Launching Tank Robot

As an Ex-3647 student... i remember that tank...

The smaller grey tank was obtained from McMaster-Carr and is stupidly heavy/overbuilt for FRC competition uses (like 300+ PSI).

The bigger black...
Forum: General Forum 06-05-2016, 06:52
Replies: 119
Views: 15,619
Posted By Mk.32
Re: Lesson Learned 2016 - The Negative

For higher load applications (cough drive), I have learned to prefer steel. After seeing how many teams lost teeth on alum gears glad we did steel...

To save weight we do pocket out the gears...
Forum: General Forum 20-03-2016, 02:59
Replies: 12
Views: 5,927
Posted By Mk.32
Re: BattleBots 2016 Tapings in Los Angeles Tickets

Decisions.. Decisions.... Decisions.....


Also note that the closest parking is 3-4 blocks away and the area is not street parking friendly. Plan carefully and bring snacks/water.
Forum: General Forum 19-03-2016, 23:42
Replies: 8
Views: 1,030
Posted By Mk.32
Re: Team 5209: Rectify - Tinker Tie Betas now on sale!

Looks like a small lithium ion soft pack, 3.7v around 1000-800mah. These are lipo so please take caution. They will burn you quite nicely if they vent due to a short or overcurrent.
Forum: General Forum 12-03-2016, 23:52
Replies: 8
Views: 1,105
Posted By Mk.32
Re: Glacern Machine Tools

Huh... I did not know that... will look into it...

The Orange Vices look interseting, hear good things about them would love to have one to play with. But for what what the team does it probably...
Forum: General Forum 12-03-2016, 00:13
Replies: 8
Views: 1,105
Posted By Mk.32
Re: Glacern Machine Tools

I've used a few before and as far as I am concerned they worked great and were perfectly suited for cnc and manual work.
Forum: Electrical 18-02-2016, 02:59
Replies: 4
Views: 920
Posted By Mk.32
Re: What ESC Could Work for CIMS?

Any brushed ESC that can do 12 can run a CIM, you'll want something that can handle around 20-30 amps at least.

http://e0designs.com/products/ragebridge/ I love the Charels Guan series of Rage 1...
Forum: Extra Discussion 12-02-2016, 19:36
Replies: 6
Views: 1,609
Posted By Mk.32
Re: pic: Team 192's 2016 Teaser

As a "machinist" i love the details on the machining, looks very well made guys.
Forum: Extra Discussion 06-02-2016, 18:44
Replies: 14
Views: 1,902
Posted By Mk.32
Re: pic: Toolbox NSFW

Reddit does NSFW for things that are "really outstanding" (ex clean wiring and clean tool boxes etc) not necessary the usual NSFW type stuff.
Forum: General Forum 12-01-2016, 15:49
Replies: 35
Views: 7,938
Posted By Mk.32
Re: Pneumatic Wheels vs Treads

Expensive... I've heard $200-300 a piece is average.
Forum: General Forum 30-11-2015, 17:26
Replies: 2
Views: 838
Posted By Mk.32
BAG Motor at higher then 12v

Hello all,

Working on a fun project, hoping to use bag motors.

How do these do at higher then 12v, say around 15-17v (4S Lipo)?
Will be using current limiting controllers so they shouldn't be...
Forum: General Forum 13-11-2015, 19:46
Replies: 33
Views: 7,548
Posted By Mk.32
Re: FRC GRANT-DECISION DAY 2016

alextound, has the dozens of replies, and I am sure all the PM/red-dots you've received not told you anything.

I understand this money could make a break a team's season (my team got started...
Forum: General Forum 09-11-2015, 00:47
Replies: 47
Views: 9,662
Posted By Mk.32
Re: Tem 973 Pruhzents: SKYSTALKER-ER

Yep, they decided to plate Aerial Assist instead of the current game after checking with teams to make sure they would get enough entries.
Forum: Announcements 23-06-2015, 05:51
Replies: 233
Views: 61,767
Posted By Mk.32
Re: BattleBots Return - And They're Powered by VEXpro!

I can add some details here from what I heard... and know from past events that seem to have carried over.

Team's were pooled mostly from existing groups of known builders that were still...
Forum: Announcements 17-06-2015, 22:21
Replies: 233
Views: 61,767
Posted By Mk.32
Re: BattleBots Return - And They're Powered by VEXpro!

Did you know Charles has a team too: https://www.facebook.com/profile.php?id=907874199272365&fref=ts

With a design that featured uberclocker as a spirit animal.
Forum: Technical Discussion 07-06-2015, 20:59
Replies: 17
Views: 3,657
Posted By Mk.32
Re: USB DSO aka PC oscilloscope recomendations

While not a USB one, a friend of me has one of these and loves it.

http://www.seeedstudio.com/depot/dso-quad-4-channel-digital-storage-oscilloscope-p-736.html

More portable and 4 channels.
Forum: General Forum 31-05-2015, 20:53
Replies: 22
Views: 3,066
Posted By Mk.32
Re: Rescuing wet electronics

Rice has been a popular trick to get moisture out of eletronics, put said electronic device in a bag of rice and let it sit over night. Since FRC electronics are easy to take apart though, I would...
Forum: General Forum 25-03-2015, 11:03
Replies: 25
Views: 4,628
Posted By Mk.32
Re: Theft hits Portland FRC Team 1432

I wish the best for the team, it's a horrible situation to be in :/

... but just me or .. but the wording of the news article just made cringe really har....
Showing results 1 to 25 of 500
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