Reminder from: SeattleRobotics Yahoo! Group http://groups.yahoo.com/group/SeattleRobotics/cal Monday Night Chat Monday May 6, 2013 7:00 pm - 9:00 pm ...
47751
SeattleRobotics@yahoo...
May 13, 2013 2:01 pm
Reminder from: SeattleRobotics Yahoo! Group http://groups.yahoo.com/group/SeattleRobotics/cal Monday Night Chat Monday May 13, 2013 7:00 pm - 9:00 pm ...
47752
SeattleRobotics@yahoo...
May 14, 2013 1:02 am
Reminder from: SeattleRobotics Yahoo! Group http://groups.yahoo.com/group/SeattleRobotics/cal Monday Night Chat Monday May 13, 2013 7:00 pm - 9:00 pm ...
47753
SeattleRobotics@yahoo...
May 15, 2013 5:01 pm
Reminder from: SeattleRobotics Yahoo! Group http://groups.yahoo.com/group/SeattleRobotics/cal Our Monthly Meeting Saturday May 18, 2013 10:00 am - 12:00 pm ...
47754
Peter Balch
peterbalch@...
May 16, 2013 2:50 pm
I want to fatigue-test some load cells. For instance, apply 100kg for 1 second 50,000 times and apply 1000kg 1000 times; total travel 10mm. In our local Ikea...
47755
Chuck Harrison
c_f_harrison
May 16, 2013 3:42 pm
Peter, I'd recommend you stick with ordinary "shop air" pressure ~100 psi where everyday valves &fittings are happy. F=P*A tells you you need a large cylinder...
47756
Mark Kenworthy
kwmachine
May 16, 2013 3:57 pm
Wouldn't this be a good application for a cam mounted on a gear-motor with a spring to moderate the force? Then for the higher force, just substitute a ...
47757
Peter Balch
peterbalch@...
May 16, 2013 4:54 pm
Hi Chuck ... OK. That's about 7 bar right? 7 atmopheres. 0.7MPa. I wasn't sure whether I should be sticking to 3 bar. ... Maybe. At the moment, our "press" has...
47758
Dan Tebbs
dantebbs
May 16, 2013 5:18 pm
That's brilliant! Extra points for KISS. I'll bet good money 50K cycles with high force peaks will break something in your rig... unless you severely...
47759
David Buckley
robots42
May 16, 2013 5:45 pm
Peter Air fittings (and water fittings come to that) are rated to 10 bar ie 150psi, above that you are on your own. Fancy expensive compressors will still have...
47760
Peter Balch
peterbalch@...
May 16, 2013 6:09 pm
... Perhaps it does. That's one suggestion I've had from my wife's cousin who has done exactly that for small engineering firms. Once again, I'd probably use...
47761
phoneguin
May 16, 2013 9:12 pm
Sounds like a windshield wiper motor would be better suited. Instead of pushing windshield wipers, have it push your fence post up and down. Much easier than...
47762
twcarroll@...
May 16, 2013 9:53 pm
Peter, From my past experience with aerospace testing, I would go with a pneumatic cylinder set-up. a short 6" diameter cylinder has a 28.26 sq. in. surface...
47763
Kevin Ross
kevinwross
May 17, 2013 12:28 am
I also agree that pneumatics is going to be the easiest way. You will need a fairly large diameter piston to generate 1000kg of force using off the shelf air...
47764
Charlie H
charlieheath...
May 17, 2013 11:28 am
Peter, Have you thought about using a motorized automotive scissor jack? They have plenty of power and and the linear range is greater than you need. You would...
47765
SeattleRobotics@yahoo...
May 17, 2013 5:01 pm
Reminder from: SeattleRobotics Yahoo! Group http://groups.yahoo.com/group/SeattleRobotics/cal Our Monthly Meeting Saturday May 18, 2013 10:00 am - 12:00 pm ...
47766
Peter Balch
peterbalch@...
May 17, 2013 6:17 pm
Charlie ... I think that it would be too slow for this particular project. They seem to take tens of seconds to extend. But I could imagine it being a useful...
47767
Peter Balch
peterbalch@...
May 17, 2013 6:44 pm
Kevin ... I was expecting to use a 10-to-1 lever so the piston has to lift 100kg over a distance of 10cm. ... Maybe. But the piston would be under load (100kg)...
47768
ListServ
theear1
May 17, 2013 8:08 pm
Clippard has a pretty complete product line, and some good documentation on pneumatics. Look at their knowledge base and catalog for what is possible. ...
47769
Kevin Ross
kevinwross
May 19, 2013 5:25 am
Compressor duty cycles are often times specified in 10 minute intervals or in 1 hour intervals. You need to check with the specific model you are looking to...
47770
Peter Balch
peterbalch@...
May 19, 2013 1:50 pm
Thanks Kevin. I think I'm beginning to understand what we need to buy but the valves are still a mystery. If I want active retraction of the cylinder (i.e. a ...
47771
mark@...
kwmachine
May 19, 2013 3:12 pm
Rotary screw type compressors are designed to run continuously. I don't know of any type designed for continuous service. Connected by DROID on Verizon...
47772
Mark Kenworthy
kwmachine
May 19, 2013 11:37 pm
That should be “any other type that is rated for continuous service”. Our rotary screw compressor has two operational modes. One where it just runs...
47773
SeattleRobotics@yahoo...
May 20, 2013 2:01 pm
Reminder from: SeattleRobotics Yahoo! Group http://groups.yahoo.com/group/SeattleRobotics/cal Monday Night Chat Monday May 20, 2013 7:00 pm - 9:00 pm ...
47774
Howard
ahtoburen
May 20, 2013 4:30 pm
I want to build a tracked robot, sort of like a tank, to explore or search in caves. It needs to wire controlled. Does anyone know where I can buy kits,...
47775
robotMaker
robotmeiker
May 20, 2013 6:09 pm
Is this a nature project? Wire controlled because RF does not work in the cave? How far do you need to go into the cave? Cesar ________________________________...
47776
SeattleRobotics@yahoo...
May 21, 2013 1:01 am
Reminder from: SeattleRobotics Yahoo! Group http://groups.yahoo.com/group/SeattleRobotics/cal Monday Night Chat Monday May 20, 2013 7:00 pm - 9:00 pm ...
47777
Kevin Ross
kevinwross
May 21, 2013 1:39 am
Compressor duty cycles are often times specified in 10 minute intervals or in 1 hour intervals. You need to check with the specific model you are looking to...
47778
Kevin Ross
kevinwross
May 21, 2013 1:40 am
Compressor duty cycles are often times specified in 10 minute intervals or in 1 hour intervals. You need to check with the specific model you are looking to...
47779
fred miller
jamericanfreddy
May 21, 2013 3:23 pm
on wireless it wont work in caves or underwater,bluetooth or wifi You need a onboard computer or cpu with a good navigation program. On robot bases a...
