Search found 229 matches

by daliad100
Mon May 20, 2013 12:57 pm
Forum: Antweights
Topic: Earthwormjim's Stuff
Replies: 492
Views: 60767

Re: Earthwormjim's Stuff

Assuming I've got the right email address, you've got mail. Extrapolating from the data about other titanium's and what the book says the gist of it is: 830-915C for maximum 1h (likely below 30 mins due to being thin material) for the solution treatment. Water quench. Age at 480-595C for 4ish hours....
by daliad100
Sat May 18, 2013 8:49 pm
Forum: Antweights
Topic: Earthwormjim's Stuff
Replies: 492
Views: 60767

Re: Earthwormjim's Stuff

I'm going to the library tomorrow so I'll grab some scans/pictures of the book. You're looking at temperatures of the order of 1000+°C without using a direct flame (makes titanium carbide, hard but brittle) so induction heating might be an idea to get it up to initial temperature. The ageing bit req...
by daliad100
Sat May 18, 2013 6:56 pm
Forum: Antweights
Topic: Earthwormjim's Stuff
Replies: 492
Views: 60767

Re: Earthwormjim's Stuff

We did some labs at university on material treatments. Proper heat treatment of titanium is most likely a bit beyond your average person although if you're interested I'm pretty sure we have the heat treatment handbook floating around the library somewhere. Should be able to work harden it easily en...
by daliad100
Sat Apr 27, 2013 7:40 am
Forum: Roboteer Websites
Topic: need advice on source for gears and/or the best forum
Replies: 2
Views: 1732

Re: need advice on source for gears and/or the best forum

With the loading required you could quite possibly get away with only using a pulley type mechanism. Consider a reversing belt drive ( 180 degree twist in the belt ). Stick the pulleys on the hinge axis of your door and then permanently attach the rope/belt/chain to the pulley. When you open either ...
by daliad100
Tue Apr 02, 2013 3:26 pm
Forum: Antweights
Topic: I'm giving up
Replies: 92
Views: 16602

Re: I'm giving up

Just plug the battery into a spare channel, make sure + in on the middle pin of the receiver and you won't break anything. I think for your receiver - is closest to the edge. If it doesn't work put negative on the other side.
by daliad100
Mon Apr 01, 2013 11:46 pm
Forum: Antweights
Topic: I'm giving up
Replies: 92
Views: 16602

Re: I'm giving up

Positive should be on the middle pin and negative closest to the edge, you might want to see if you can swap the battery connector for a three pin one so plugging it in the wrong way round just won't work rather than blowing up something
by daliad100
Fri Mar 22, 2013 7:59 am
Forum: Antweights
Topic: Antweight bits for beginners
Replies: 36
Views: 30371

Re: Antweight bits for beginners

It would, might have to play with potentiometer values or hack your transmitter to get the extra travel. Simplest way I can think of is put a resistor on each side of the pot track making it effectively longer so it has to travel further to get the same proportion of voltages hence your axe travel f...
by daliad100
Thu Feb 14, 2013 5:34 pm
Forum: Off-topic
Topic: Slip rings, rotary connectors, reels, etc.
Replies: 4
Views: 3113

Re: Slip rings, rotary connectors, reels, etc.

Couldn't you build something roll up extension lead style? No slip rings plus extends from one end. No auto retract though but you could buy a cheap retractable tape measure, swap the tape for wire, run one end out a hole made in the centre of the reel and case and the other through the tape hole. M...
by daliad100
Wed Feb 06, 2013 11:39 pm
Forum: Questions (and answers)
Topic: Polycarbonate vs HDPE
Replies: 12
Views: 5644

Re: Polycarbonate vs HDPE

I've cold bent acrylic to the right shape then used a heat gun to get it close to melting to relieve the stress. The closer to melting you get it the less it springs back. HDPE should work better than acrylic because it cold bends better and has a lower melting point (you could dunk it in boiling wa...
by daliad100
Wed Jan 02, 2013 6:27 pm
Forum: Antweights
Topic: Servos as speed controllers and cheapo 9g gear motors!
Replies: 22
Views: 5071

Re: Servos as speed controllers and cheapo 9g gear motors!

Replace the potentiometer with a trimpot or a pair of resistors. should get you close enough to deal with any wandering using radio trims.
by daliad100
Wed Dec 12, 2012 8:01 pm
Forum: Antweights
Topic: charging smaller lipo batteries
Replies: 8
Views: 2303

Re: charging smaller lipo batteries

Battery.png
Battery.png (6.21 KiB) Viewed 2276 times
Left connector is the balance lead one and goes into the charger, right connectors are the micro jst's for your batteries.
by daliad100
Wed Dec 12, 2012 3:50 pm
Forum: Antweights
Topic: charging smaller lipo batteries
Replies: 8
Views: 2303

Re: charging smaller lipo batteries

That one can only do 2s or 3s lipo's. You could probably cheat and solder a couple of micro jst connectors to the balance lead and get it to treat the cells a 2s or 3s battery. As it's balancing the cells and you won't be soldering cells together you shouldn't get any explosions.
by daliad100
Sun Nov 25, 2012 11:03 pm
Forum: Off-topic
Topic: Help! Need materials
Replies: 8
Views: 3521

Re: Help! Need materials

Aren't crisp packets foil coated plastic aka near enough to mylar?

Get eating.
by daliad100
Fri Jun 08, 2012 1:42 am
Forum: Questions (and answers)
Topic: Mechanisms
Replies: 2
Views: 843

Re: Mechanisms

Would allowing slip in the drive via a friction clutch or belt work? Static friction coefficient (not slipping) is generally more than Dynamic friction coefficient (slipping) so when the output shaft is stalled the load on it is reduced making more power available to the other outputs. I may be talk...
by daliad100
Fri Mar 16, 2012 8:29 am
Forum: Fleaweights
Topic: Flea weight quastions
Replies: 4
Views: 2072

Re: Flea weight quastions

Yes it does. It has to fit in a 3" by 3" cube but that is in any orientation so you can have a robot longer/wider than 3".