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  Topic: Micro Magnum, Team Magnum, NSW
Nick

Replies: 547
Views: 22953

PostForum: Builders Reports   Posted: Mon Oct 16, 2017 10:33 pm   Subject: Micro Magnum, Team Magnum, NSW
A different option is to make the bot self-righting with the weapon. If you make the tops of the motor mounting arms a bit shorter so that the body of the disk doesn't touch the floor but the tooth do ...
  Topic: What to do with a BIG outrunner?
Nick

Replies: 1
Views: 40

PostForum: Technical Chat   Posted: Mon Oct 16, 2017 8:06 pm   Subject: What to do with a BIG outrunner?
It looks a bit fragile for a combat bot; maybe just put it on eBay? Or ago-kart?
  Topic: Micro Magnum, Team Magnum, NSW
Nick

Replies: 547
Views: 22953

PostForum: Builders Reports   Posted: Mon Oct 16, 2017 7:57 pm   Subject: Micro Magnum, Team Magnum, NSW
The tape works much better if there is a large surface area. If you attach it to the top plate, any impact force will go into the top plate, potentially cracking it.
  Topic: Micro Magnum, Team Magnum, NSW
Nick

Replies: 547
Views: 22953

PostForum: Builders Reports   Posted: Sun Oct 15, 2017 9:39 pm   Subject: Micro Magnum, Team Magnum, NSW
I doubt that printed armour will stand up to even one hit from regular featherweights; I'd go with the thickest possible HDPE
  Topic: Micro Magnum, Team Magnum, NSW
Nick

Replies: 547
Views: 22953

PostForum: Builders Reports   Posted: Sun Oct 15, 2017 5:17 pm   Subject: Micro Magnum, Team Magnum, NSW
The design is getting incredibly compact - excellent work. When the bot is inverted, those weapon motors are going to be very exposed to other bots.
  Topic: Micro Magnum, Team Magnum, NSW
Nick

Replies: 547
Views: 22953

PostForum: Builders Reports   Posted: Thu Oct 05, 2017 5:23 pm   Subject: Micro Magnum, Team Magnum, NSW
Unless you are going to have other parts press right up against the drive motors, you don't really need so much complex shielding around them; just a piece of aluminium angle will work and cost almost ...
  Topic: Jolt & friends - Team Overkill - NSW
Nick

Replies: 8546
Views: 1142339

PostForum: Builders Reports   Posted: Fri Sep 29, 2017 8:35 pm   Subject: Jolt & friends - Team Overkill - NSW
CNC mill:

The mount for the PDB cylinder is two thirds done, the sides are attached and now the top plate has to be cut to fit:

http://www.nswrfc.org/Nick/P9291739.JPG

The top plate is rebate ...
  Topic: Nick's spring-cleaning sale
Nick

Replies: 0
Views: 137

PostForum: The Marketplace   Posted: Tue Sep 26, 2017 9:33 pm   Subject: Nick's spring-cleaning sale
Hi all, To feed the CNC mill project, I am cleaning out all my hoarded bot parts. More will be added as I find them. Most items are brand new or have only been used for testing. Prices do not include ...
  Topic: Micro Magnum, Team Magnum, NSW
Nick

Replies: 547
Views: 22953

PostForum: Builders Reports   Posted: Sun Sep 24, 2017 11:54 pm   Subject: Micro Magnum, Team Magnum, NSW
The needle roller bearings with the thin shells are called 'pressed cup' bearings due to the way the shells are formed. They are usually sold without an inner race and you use them straight on a shaft ...
  Topic: Micro Magnum, Team Magnum, NSW
Nick

Replies: 547
Views: 22953

PostForum: Builders Reports   Posted: Sun Sep 24, 2017 11:11 pm   Subject: Micro Magnum, Team Magnum, NSW
Most needle rollers have very thin outer shells that can easily deform. Some people have had good experiences with them but I have also seen plenty fail. The other problem is that they have almost zer ...
  Topic: Micro Magnum, Team Magnum, NSW
Nick

Replies: 547
Views: 22953

PostForum: Builders Reports   Posted: Sun Sep 24, 2017 10:33 pm   Subject: Micro Magnum, Team Magnum, NSW
The bearing is a 6804 or 61804 any extra codes at the end describe the type of seals or special features. all the tech data for a similar model are here: http://www.skf.com/au/products/bearings-units- ...
  Topic: Micro Magnum, Team Magnum, NSW
Nick

Replies: 547
Views: 22953

PostForum: Builders Reports   Posted: Sun Sep 24, 2017 10:05 pm   Subject: Micro Magnum, Team Magnum, NSW
OK, I had the wrong idea about the set-up. With both the outer bearings partly out of the disk, I think you have extra risk of the outer ring deforming or cracking. The bearing industry has a standard ...
  Topic: Micro Magnum, Team Magnum, NSW
Nick

Replies: 547
Views: 22953

PostForum: Builders Reports   Posted: Sun Sep 24, 2017 9:37 pm   Subject: Micro Magnum, Team Magnum, NSW
The 3rd bearing has a good chance of breaking or not really supporting the disk due to being so far out of the disk. I would still leave it in there as it can't hurt and should add some support. 7mm i ...
  Topic: Jolt & friends - Team Overkill - NSW
Nick

Replies: 8546
Views: 1142339

PostForum: Builders Reports   Posted: Sun Sep 24, 2017 7:31 pm   Subject: Jolt & friends - Team Overkill - NSW
CNC mill:

I reassembled the spindle in the head and lined up the PDB cylinder to get an idea of how to mount it:

http://www.nswrfc.org/Nick/P9241734.JPG

The cylinder adds 460mm to the top of ...
  Topic: Micro Magnum, Team Magnum, NSW
Nick

Replies: 547
Views: 22953

PostForum: Builders Reports   Posted: Sat Sep 23, 2017 12:51 am   Subject: Micro Magnum, Team Magnum, NSW
Maybe they have some special tape, but most adhesives do a poor job on HDPE, its what's called a low surface energy plastic and is hard to bond to.
 
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