Gabriel

[craig_colliass]

Re: Gabriel

Working well till this happened


Going to redesign the drive system again :shock: :shock:
It won't be making it to Portsmouth now

[Mouldy]

Re: Gabriel

Easy fix...

on the round part that has a square hole through it... tap that through the other side of the gearbox... file the crimped parts of the base of the gearbox to remove the 1mm ali cover plate...

Once uve done that you sould be able to nock out the shaft totaly with the gear and bushes...

Replace the shaft with a square hole with a solid bar of the same OD... re-build the gearbox, with bushes then pin through the boss on the nylon worm wheel into the new solid axle....

..bore out the pulley and fit it over the new solid shaft... then pin/grubsrew it on.

Something ive considered doing, as its probably a 30min job per side if you have a bar the right OD kicking around, and it can be done in the shed/garage without the need of a lathe.

Hope this helps.

[craig_colliass]

Re: Gabriel

Many thanks Dave,
I have stripped down the gearbox but The shaft is 8mm diameter but were the box wheel is, the shaft has straight Knurled splines the diameter there is 8.3mm
Has anyone the facility to put splines on 8mm round bar?
If so please PM me

[Mouldy]

Re: Gabriel

If you pin the worm wheel you won't need the splines... Just something to take up the 0.3 gap... Maybe drill the gear centre out to 10mm and put some 8mm ID 10mm OD tube in to fill the gap? Then pin the lot together. Would be a simple fix to get you away...

[woody]

Re: Gabriel

A machine shop should be able to straight knurl a section of the 8 mm bar.

[Mouldy]

Re: Gabriel

The knurl is rubbish anyhow...everytime I've had a Bosch 35 fail it's been due to the knurl chewing up in the nylon gear, which causes the gear to rotate freely on the shaft.

[craig_colliass]

Re: Gabriel

I've been doing bits on Gabriel to try and get the new version going for the next show. I have given up on belts and am going back to chains for the drive using some cheap e bay motors (the Gimson motors weren't for sale when I designed the drive.)

I am also thinking of changing the axe head for a circular saw blade for the axe head as it looks better!

Pictures to follow If I can get the axe arm done soon.

[james...venom]

Re: Gabriel

Looking good craig! I have just done this mod for the Bosch motors. If you have a look at the Predator build thread ive detailed how I made the shaft and added pics too. I used a 12mm bar and turned the ends down to 8mm for the bushes. The I put a 9mm square onto the 12mm section left in the middle. This left nicely radiused corners. i then machined a 9mm square in the nylon gear using a 3mm cutter and it all went together nicely.

[craig_colliass]

Re: Gabriel

Got the robot with the new drives sorted and on the first test the new gearboxes bust again!

I have a plan B but I don't know if I will be able to get it going in time for the Burgess Hill event.

with the walker taking a lot of my robot time and I must get Saint going again.

I can't understand why I just can't get the drive to work on this robot it isn't like I haven't made big-wheel robots before!

[craig_colliass]

Re: Gabriel

Gabriel is alive with a transmission that actually works for more than 25 seconds!!!

I have decided on an Interesting axe head for it.



I hope to have a video of it going this week, but hope to bring it along to the next event anyway.



It still needs some bits doing. Hopefully I will get the time this coming week to get it all to specification.

[tweedermeister]

Re: Gabriel

that looks brilliant !!!!

[razerdave]

Re: Gabriel

great work Craig

Although, I'll be honest, that saw is going to break before long.

[craig_colliass]

Re: Gabriel

Many thanks guys

Dave the saw blade is one used for cutting wood normally, so it is made from quite soft steel, it won't shatter it will just bend and has a bit already!

It's more for show, an electric axe in this class is never going to break much, so lets make it look different.

[craig_colliass]

Re: Gabriel

Video as promised.



http://www.youtube.com/watch?v=5s9AbMvIp4s

[craig_colliass]

Re: Gabriel

Just measured the robot
Weight 12.9Kg
Length 750mm
Width 900mm
Height 400mm
Could this be the widest featherweight robot ever?