SERVING THE QUANTITATIVE FINANCE COMMUNITY

Search found 13013 matches

by farmer
January 2nd, 2019, 1:09 pm
Forum: Off Topic
Topic: where did this bullet come from?
Replies: 0
Views: 115

where did this bullet come from?

Someone found a bullet, I am trying to figure out where it came from. There is like a cylindrical dent repeated all over it. Like it bounced off many identical things. http://confederaterobot.com/repeatedgrooves.png This could be from the inside of a Savage Range Systems high-capacity bullet catcher...
by farmer
November 16th, 2018, 12:30 pm
Forum: Off Topic
Topic: hog hunting
Replies: 2
Views: 170

hog hunting

by farmer
August 25th, 2018, 12:16 pm
Forum: Off Topic
Topic: AR-10 Assault Robot
Replies: 0
Views: 145

AR-10 Assault Robot

I have to rethink the posture before I can put a reaching tool on there. So I just put an AR-10 which maintains an effectively constant center of gravity with a greater than 1000-foot reach
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by farmer
July 3rd, 2018, 1:12 am
Forum: Off Topic
Topic: funny robot videos
Replies: 4
Views: 200

Re: funny robot videos

Grade 8 bolts and got them all...
by farmer
June 30th, 2018, 7:05 pm
Forum: Off Topic
Topic: funny robot videos
Replies: 4
Views: 200

funny robot videos

Some sort of funny videos of my robot...
by farmer
February 22nd, 2018, 12:37 am
Forum: Off Topic
Topic: understanding screw torque
Replies: 2
Views: 193

Re: understanding screw torque

I think I figured it out. A gearhead with a low ratio will not burn a lot of energy just spinning. But the worm has a bad angle on the gear, so it is not very efficient at low speed. So a 10:1 gearhead might have a stall torque that is no greater than the full speed torque. But as the ratio goes up....
by farmer
February 22nd, 2018, 12:03 am
Forum: Off Topic
Topic: understanding screw torque
Replies: 2
Views: 193

understanding screw torque

Looking at different worm gearheads, I notice that "full load" spinning torque does not double when the gear ratio doubles. I assume this is because when the screw turns twice as far to spin the gear the same distance, it generates twice as much friction and heat. I have two questions: 1) Assuming t...
by farmer
September 1st, 2017, 9:11 pm
Forum: Off Topic
Topic: gas powered robot?
Replies: 2
Views: 508

Re: gas powered robot?

You have any thoughts on this?
by farmer
August 23rd, 2017, 1:22 am
Forum: Off Topic
Topic: gas powered robot?
Replies: 2
Views: 508

gas powered robot?

My neighbor stopped mowing lawns so I decided to build a robot. For many tasks including cleaning and painting. My requirements included 1) be sturdy enough to carry and guide a weed whacker 2) be able to move quickly on smooth terrain 3) be able to go up the various types of stairs and uneven land ...
by farmer
August 5th, 2017, 7:48 pm
Forum: Off Topic
Topic: thanks, curiosity satisified
Replies: 17
Views: 1363

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by farmer
August 5th, 2017, 7:47 pm
Forum: Off Topic
Topic: thanks, curiosity satisified
Replies: 17
Views: 1363

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by farmer
August 5th, 2017, 6:50 pm
Forum: Off Topic
Topic: thanks, curiosity satisified
Replies: 17
Views: 1363

tx

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by farmer
August 5th, 2017, 5:40 pm
Forum: Off Topic
Topic: thanks, curiosity satisified
Replies: 17
Views: 1363

thanks, curiosity satisified

Thanks for your responses, I have satisfied my curiosity.
by farmer
June 21st, 2017, 6:33 am
Forum: Off Topic
Topic: your Green Energy dollar at work
Replies: 3
Views: 411

your Green Energy dollar at work

I thought this company was up the street from me, but I looked again and the address says Padiham. http://www.solxenergy.com/index.php/how-it-works Can anyone tell how much of this is a scam and how much is a joke? The punch line is they supposedly install solar panels in air conditioning units, to ...
by farmer
April 16th, 2017, 12:36 am
Forum: Programming and Software Forum
Topic: Reading linux device from file from device tree overlay without 300-microsecond overhead
Replies: 5
Views: 744

Re: Reading linux device from file from device tree overlay without 300-microsecond overhead

They say in Unix "everything is a file." So I assume this is some sort of interface by which various drivers try to behave like a file. But really this is annoying if I have to open them like a file it is crazy and I can't imagine they ran a phone system in New Jersey that way.
GZIP: On