Bruce

All things small and scratchy.

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earthwormjim
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Post by earthwormjim » Sat Nov 06, 2010 10:56 am

Joey wrote:I find it rather odd that 'Bruce' is referred to with feminine pronouns :P a bit Blackadder in nature perhaps...
LOL! I hadn't noticed!! :o

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earthwormjim
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Post by earthwormjim » Sat Nov 06, 2010 11:14 am

As for mechanical connections,weight isnt the issue.The uprights will need to be remade I think,there is just not enough material to fix to. I may try to use some wire,fibreglass sheet and resin to make the joints. :-?
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alasdair
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Post by alasdair » Sat Nov 06, 2010 11:32 am

Wow! precision engineering or what?! :D

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earthwormjim
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Post by earthwormjim » Sat Nov 06, 2010 3:36 pm

alasdair wrote:Wow! precision engineering or what?! :D
Very nice of you to say so! But it is a little rough around the edges,if you look close enough,as it is mainly done using files and some wet and dry sandpaper!
I think that drilling a tiny hole in the chassis pieces,then sewing some thin wire through the holes to tie the pieces together,then epoxying the lot together might be the way foreward.I used to use that method to get the curve to hold when building model boat hulls!
Worth a try,anyway! :)

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earthwormjim
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Post by earthwormjim » Thu Nov 18, 2010 11:53 am

I got the new servos for bruce,not bad for 4.99 each!!
from here...
http://www.galaxymodels.co.uk/detail.as ... 9&rootid=2
This is what they look like...
Image
I thought I would explain how the mod was done.I think it is pretty painless,and the result is a tiny and fast drive motor.
The mod to the servo couldnt be easier,no messing around with pots!
I removed the two final gears,which also removes the part that turns the pot,and also speeds up the output loads.
Here is the modded servo.The removed gears are in the foreground...

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Then you just epoxy a lego axle onto the final gear...
Image

This is a final modded servo...
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Just a spare nut,added to the other shaft to take up the space taken by the other removed gear

The result is not very powerful,but pretty fast for such a small unit. :D

josh
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Post by josh » Thu Nov 18, 2010 1:21 pm

although there is no gear to adjust the pot i would put a bit of glue into it as it could move from vibrations and its a pain to get inside the servo at an event to re-adjust the pot.
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earthwormjim
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Post by earthwormjim » Thu Nov 18, 2010 2:08 pm

Yep,that does sound like good advice. :)

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earthwormjim
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Post by earthwormjim » Mon Dec 06, 2010 5:44 pm

I finished modding Bruces new drive servos today.:)
I have trimmed down the wheels too,from the lego original,on the left,to the trimmed finished article on the right.

Image

20 mins with a stanley knife and a small file.

haz
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Post by haz » Mon Dec 06, 2010 5:51 pm

nicey nicey zoo zoo :D hmm smaler wheels less speed eh?

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Jonny
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Post by Jonny » Mon Dec 06, 2010 6:32 pm

Noice Noice Noice
the mighty boosh.
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earthwormjim
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Post by earthwormjim » Thu Dec 09, 2010 12:48 pm

Cleaned up bruces chassis and glued the new servos in place.Waiting for the rx to come into stock at model shop website. Will order 6v nimh battery today from Roaming Robots.
Need to get to Sussex model centre and see if they have stocked up on 1.5mm fibreglass board too.


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earthwormjim
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Post by earthwormjim » Sat Jan 01, 2011 12:26 pm

Slow progress.
To be honest,I have been unwell for a while now,but hopefully I am getting better now.
Anyway,I found enough scrap 1.5mm fibreglass board to make new lifting arms for Bruce. They are lower profile than the old ones,so Bruce will be a little lower,and with less of an arc to the body shape...

Image

Like I said,slow progress,but hopefully some more fibreglass board is on the way,with the help of the great people and info available on the forum here! :)
Cheers for now,Jim

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Post by haz » Sat Jan 01, 2011 4:16 pm

lookin' good

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earthwormjim
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Post by earthwormjim » Sat Jan 01, 2011 5:28 pm

haz wrote:lookin' good
Cheers Haz.
The lifting arms are twice as thick as the old ones,so should be more robust. The 6v battery I got from the RR shop is much bigger than I thought,and definately wont fit.So I will try and source another 4.5v 120mah one from somewhere.I am going to use some 4mm polycarb to brace the lifting arms,so weight may become an issue with the rebuild soon!!

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joey_picus
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Post by joey_picus » Sat Jan 01, 2011 5:29 pm

Looks brilliantly made :) is the servo one that has outputs on either side or is there a makeshift axle on the other side?
Joey McConnell-Farber - Team Picus Telerobotics - http://picus.org.uk/ - @joey_picus
"These dreams go on when I close my eyes...every second of the night, I live another life"

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