BOB FW Series

[Ocracoke]

What I do with keyed shafts and grub screws these days is drill an indent into the shaft just wide enough for the grub screw to sit in and then use lockthread to hold it in. Works well enough on my Middleweight.

[sean retro]

The next thing to do is change the motor for the linear from brushed to brushless to get more speed out of it. Just need to find the right size for it, 38mm max size. The gear size will depend on the size of the motor shaft.

[sean retro]

Went to Grantham to take part on Saturday and only got one fight out of it, with no weapon as well.
At the back, I was getting it ready I heard a little bang, fuse has blown, a few coupes tries later it was the linear that was doing it. I remember a few weeks back took the back cover off to take some measurement and when I put it back on I must have caught a wire. So I went in to do my first 'and only' fight.

Things was going well for me until it died, found out a wire came lose, got that fixed 'thanks Danny for that' put the link back on and the light was back on. At the second fight came my robot didn't move, check it and found a blown fuse it must have happened when the wire came lose.

So now I'm going from 30amp to 60amp and going from link>light>fuse to link>fuse>light this time.

So far the only video with BOB 3 in it.

[sean retro]

Well that was really fun, the only problem I had when a wire came loose, steering was in reverse and in the last fight the battery losing power.

1st fight
Apart from the steering I been trying to avoid the spinners and look what happens, also the back panel cracked.


2nd fight
It was going well until I got pushed into the pit.


3rd fight
On day two I replaced the back panel just to play it safe. Got knocked around a bit on its left side and getting flipped.
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4th fight
I do not know why but that left side keeps getting hit by spinners, but with it beaning the last fight of the day it doesn't really matter how much beat up it gets. The only thing in that one was the battery dying on me.
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Post fight.
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Those spinners really took a good go at it and in the same place as well. With components intact the only thing to do is build new armour and make it smaller.

[McMullet]

Seems like you took the hits well! Are you taking BOB to Robodojo next weekend?

[sean retro]

Yes, just need to make a new body for it.

[sean retro]

For next year's Robodojo I'll be making BOB 4 for the full combat fights.

BOB 4 will be an axe bot with interchangeable wedge, snow plough, etc. It'll make a nice back up if the axe breaks in the middle of the fight. This is going to be my first robot with a axe, so it's going to be all trial and error choosing the sprockets, roller chain, steel round bar, etc. I might throw in interchangeable axe heads as well for the fun of it.

[team death]

Sounds like a major Project Sean, looking forward to see what you come up with.

[McMullet]

Sounds good! I'm hoping to graduate to the full combat fights too, look forward to seeing your progress.

[sean retro]

Any tips on getting that nut off the scooter motor.
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No matter how hard I try to keep the motor from turning it just wants to turn. Also I'm sure they guled the hut on.

[Ocracoke]

It is kind of, it is in threadlock. I had to get these off for Kaizen before I switched out for something else. I detailed how I got mine off in the build thread for Kaizen here: https://www.fightingrobots.co.uk/thr...l=1#post472505

The nut needed a 19mm socket on mine so I'd start there.

[Roboteernat]

The sprocket is a D shape, if you dont want the sprocket tighten it into a vice or a set of pliers and use a spanner to unscrew the nyloc nut. Otherwise clamp around the sprocket with material to stop it spinning and hold onto the material and use the spanner, or clamp the shaft in a set of maul? grips and undo. it will come undone

As above post thats linked

[sean retro]

Well, I have been using a spanner and pliers to do the job, but the pliers can't seem to get a good grip on it. I'm sure I got a 19mm socket hiding in my Dad's old toolbox, also I need to get a new vice as well, my broke.

[team death]

If you are still stuck Sean, first make sure the nut is not left hand thread-you can do this

by tracing the exposed thread with your finger nail to make sure you are slackening rather

than tightening.

Invest in a pair or quality snipe nose mole grips to hold the shaft and then use a good spanner

or socket to turn the nut the correct way.

[Maxamuslead]

there standard thread, use mole grips, Slip Joint Plie etc to grip the shaft and something to grip the nut.

but you will need to battle hardern the magenets in the scooty, and it suggestable to weld the sporket onto the motor shaft. you know what chain you going to be using ?