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  Topic: Jolt & friends - Team Overkill - NSW
Nick

Replies: 8351
Views: 991806

PostForum: Builders Reports   Posted: Thu Mar 30, 2017 8:37 pm   Subject: Jolt & friends - Team Overkill - NSW
Cheated by cheetah:

The roll of cheetah flexible filament arrived and was immediately thrown on the printer. I had suspicions about the filament even before it printed and the test print confirmed ...
  Topic: Micro Magnum, Team Magnum, NSW
Nick

Replies: 131
Views: 4792

PostForum: Builders Reports   Posted: Thu Mar 30, 2017 4:42 pm   Subject: Micro Magnum, Team Magnum, NSW
There are a couple of ways to tension belts; you can mount the motor on slots so it slides away from the other pulley or you can make an idler pulley that mounts on a slot at right angles to the belt. ...
  Topic: Micro Magnum, Team Magnum, NSW
Nick

Replies: 131
Views: 4792

PostForum: Builders Reports   Posted: Wed Mar 29, 2017 8:28 pm   Subject: Micro Magnum, Team Magnum, NSW
Pulleys mostly start off as a solid round bar; its hard to find tube with a thick enough wall. The main choices for belts are V (the most common), timing and micro V (super rare but my fave).

A non ...
  Topic: Jolt & friends - Team Overkill - NSW
Nick

Replies: 8351
Views: 991806

PostForum: Builders Reports   Posted: Wed Mar 29, 2017 7:54 pm   Subject: Jolt & friends - Team Overkill - NSW
Sick day:

Due to feeling decidedly dodgy, not much bot building has been happening this week. I did some experiments with the 3D printer to find a setting that lets Ninjaflex peel off the bed witho ...
  Topic: Micro Magnum, Team Magnum, NSW
Nick

Replies: 131
Views: 4792

PostForum: Builders Reports   Posted: Wed Mar 29, 2017 6:44 pm   Subject: Micro Magnum, Team Magnum, NSW
Three more good reasons to put the motor behind the drum:

The motor can be on a movable bracket for belt tensioning. This will also make the belt and drum much easier to install.

The motor will ...
  Topic: Micro Magnum, Team Magnum, NSW
Nick

Replies: 131
Views: 4792

PostForum: Builders Reports   Posted: Wed Mar 29, 2017 6:32 pm   Subject: Micro Magnum, Team Magnum, NSW
In that alternate universe, the weapon motor(s) could easily be mounted behind the drum - there is a heap of space above the battery
  Topic: Micro Magnum, Team Magnum, NSW
Nick

Replies: 131
Views: 4792

PostForum: Builders Reports   Posted: Tue Mar 28, 2017 7:49 am   Subject: Micro Magnum, Team Magnum, NSW
That's a good point; the dual disks I have seen use very substantial bolts to connect the disks and the tube.
  Topic: Jolt & friends - Team Overkill - NSW
Nick

Replies: 8351
Views: 991806

PostForum: Builders Reports   Posted: Tue Mar 28, 2017 12:08 am   Subject: Jolt & friends - Team Overkill - NSW
Quick update:

The CNC stand is prepped for painting and I started working out how the plywood lining will fit:

http://www.nswrfc.org/Nick/P3271183.JPG

The choice of metal primer was bad. I bo ...
  Topic: Micro Magnum, Team Magnum, NSW
Nick

Replies: 131
Views: 4792

PostForum: Builders Reports   Posted: Mon Mar 27, 2017 11:55 pm   Subject: Micro Magnum, Team Magnum, NSW
The central tube is usually a smaller diameter than that. While it will increase the kinetic energy, the tube is easy to damage and having all those screw holes out on the rim is asking for trouble (a ...
  Topic: Micro Magnum, Team Magnum, NSW
Nick

Replies: 131
Views: 4792

PostForum: Builders Reports   Posted: Mon Mar 27, 2017 7:21 pm   Subject: Micro Magnum, Team Magnum, NSW
Its possible but probably not a huge problem. The panels would likely crack from the edge along the threaded hole; by the time to crack propagated to the pocket area, its already game over for the pan ...
  Topic: Jolt & friends - Team Overkill - NSW
Nick

Replies: 8351
Views: 991806

PostForum: Builders Reports   Posted: Sun Mar 26, 2017 9:10 pm   Subject: Jolt & friends - Team Overkill - NSW
Laughing Great idea - I can spend hours telling people how hard it was to laser cut all the hexagons out of the Colson.
  Topic: Micro Magnum, Team Magnum, NSW
Nick

Replies: 131
Views: 4792

PostForum: Builders Reports   Posted: Sun Mar 26, 2017 8:40 pm   Subject: Micro Magnum, Team Magnum, NSW
I just meant the pocketing would be an issue as you don't have a mill - everything can be outsourced for a price though.

If there is a reason for the wheels to be large, that's fair enough. Would i ...
  Topic: Total Recoil - Chunkulator - NSW
Nick

Replies: 40
Views: 1049

PostForum: Builders Reports   Posted: Sun Mar 26, 2017 7:39 pm   Subject: Total Recoil - Chunkulator - NSW
Yeah - I was just thinking pre-tensioning might help
  Topic: Micro Magnum, Team Magnum, NSW
Nick

Replies: 131
Views: 4792

PostForum: Builders Reports   Posted: Sun Mar 26, 2017 7:36 pm   Subject: Micro Magnum, Team Magnum, NSW
Most or all of the body panels can be laser cut - only the pocketing presents real difficulties. You may not get far with tools from a university; they are way too afraid of personal injury claims so ...
  Topic: Total Recoil - Chunkulator - NSW
Nick

Replies: 40
Views: 1049

PostForum: Builders Reports   Posted: Sun Mar 26, 2017 7:18 pm   Subject: Total Recoil - Chunkulator - NSW
Was that using the larger springs?
 
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