Wont heating it up red hot weaken the metal?
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Miles Blow - Julie Pitts
www.mulesfilm.com.au
www.wombokforest.com.au

-Pickasso- Vivid Sportsman champion 2015

Assuming you could heat the titanium without weakening it, you could heat and water quench to straighten the frame.
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So even the rain that falls isn't actually going to fill our dams and our river systems

Nick is there any chance that damage was caused from our fight? Looks to be the same side that the skid you gave me came from?...the skids pretty compressed where it met the chassis compared to the bit that isnt attached... not bragging... but if its combat damage its probably less to worry about than self inflicted force?

He has the same bend on things that haven't been in a fight at all mouldy.

If the thing has that much stress in it from the welding, I wonder if you could straighten it, then perhaps get them annealed and re-tempered if that is a thing one does to titanium?

I'd be really worried about bending something structural like that without more info on the heat treatment side of things.
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Mechanical engineers build weapons, civil engineers build targets

So much reply!

@ Steve: not quite sure what you mean by "Ignoring the side bend how much closer are the internal gap" ?


@ M & J: Titanium always comes annealed so heating it doesn't take out any temper. Heating it to welding temperature is a no-no as Ti absorbs hydrogen from the air and get s brittle but heating until its just bendable seems fine. To get the frame hot enough, I have this mammoth torch:



The dual burner torch at the bottom will get 8mm Ti red hot, so the top torch will definitely do the job. According to the data sheet I have, about 800 Deg. C will be enough.

@ Philip: are you sure about the quenching? I have just left the Ti to air cool in the past and its been OK.

@ Mouldy: That was my first thought too. Like the other guys pointed out, its more likely to to be the welding as the distortion is equal on both sides of the frame and the same distortion is present in another frame that has never been used.
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Australian 2015 Featherweight champion
UK 2016 Gladiator champion

Let me try that again with ah less shit grammer.

The critical dimension is between the internal gap of horizontal plates. Is that what your measuring not the external measurement?
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Steven Martin
Twisted Constructions
http://www.botbitz.com

I guess that raises the question... can you heat treat it to make it "better" somehow?
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Mechanical engineers build weapons, civil engineers build targets

@ Steve: The internal gap is the important measurement. I measured both inside & outside dimensions on Shiny and they have the same amount of taper.

@ Jake: According to Marco in the Riobotz 'bible', heat treating Ti makes it less suitable for bots as it loses its fracture resistance by 43% without getting much harder. Also, I doubt that there is anywhere in Australia that could do it properly.
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Australian 2015 Featherweight champion
UK 2016 Gladiator champion

I envisage more damage done by trying to bend it back out or retempering then the little bit of welder warping. Why not just leave it as is if it does not impede functionality.
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https://www.halfdonethings.com/

quote:

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Originally posted by Nick:
@ Philip: are you sure about the quenching?

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I will try really hard not to make that mistake!
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Australian 2015 Featherweight champion
UK 2016 Gladiator champion

Frame straightening:

The 10 ton jack has arrived and I am trying some set-ups:



There are two large clamps across the front bulkhead to help prevent any welds from cracking while the jack is pumped out and the callipers across the front of the frame show how far the support arms have moved. The jack can force the arms apart several mm with almost no pumping effort but the Ti is very springy at room temperature and has returned to its original shape so far. The problem now is to heat one of the support arms up without burning the jack - the torch puts out a 40 cm flame; longer than the frame itself! With this beast there is no such thing as localised heating.
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Australian 2015 Featherweight champion
UK 2016 Gladiator champion

Dedication
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Miles Blow - Julie Pitts
www.mulesfilm.com.au
www.wombokforest.com.au

-Pickasso- Vivid Sportsman champion 2015

Surprise!

Its a new robot: Shiny - the B team.



The frame is very similar to the original and takes most of the same parts but is 34mm narrower.



The weight saving goes into extra frame strengthening, like this extra layer of Ti under the weapon bearings.



On the inside the motors are upgraded to the 400W out-runners for more speed and pushing power. There is still much drilling, tapping. grinding and welding to do, but Shiny B will be ready for the Nationals.
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Australian 2015 Featherweight champion
UK 2016 Gladiator champion

quote:

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Originally posted by Nick:
Frame straightening:
There are two large clamps across the front bulkhead to help prevent any welds from cracking while the jack is pumped out...

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