Go to Post I think that one of the most fantastic parts about FIRST is that the biggest and most successful teams are also the most abiding to the rules. - Matt Adams [more]
Home
Go Back   Chief Delphi > Search Forums
Reload this Page Search Results
CD-Media   CD-Spy  
portal register members calendar search Today's Posts Mark Forums Read FAQ rules

Page 1 of 10 1 2345678 > Last »
Showing results 1 to 25 of 236
Search took 0.01 seconds. search: Posts Made By: Matt H.
Forum: Programming 22-01-2012, 19:28
Replies: 7
Views: 1,505
Posted By Matt H.
Re: Is It Just Me or...

This is false. Simplified models of your system can be used in effective Kalman filters provided you add uncertainty from the model.

See this paper which is an overview of the Kalman filter (esp....
Forum: Programming 20-01-2012, 22:49
Replies: 6
Views: 2,045
Posted By Matt H.
Re: Good way to find distance

Agreed! I think the statements regarding interference are highly overstated. Take a look at this statement form Maxibotix especially item number...
Forum: Motors 20-01-2012, 21:10
Replies: 6
Views: 1,046
Posted By Matt H.
Re: Banebot m7-rs775-18 sprocket???

Could you clarify your question? It's clear that you want a sprocket that mounts on the Banebots RS775 motor.

Is this a sprocket for chain or toothed belt? If so what pitch?
Forum: Electrical 20-01-2012, 21:05
Replies: 4
Views: 1,210
Posted By Matt H.
Re: does mag encoder work on jag speed mode?

Have you looked at the AS5304 output on an oscilloscope? Do you see pulses?

From the data sheet it appears that the chip needs to be positioned very precisely in relation to the multipole ring...
Forum: Kit & Additional Hardware 20-01-2012, 20:51
Replies: 4
Views: 1,202
Posted By Matt H.
Re: Sprocket for Bike Chain...

I think the best place to get bike sprockets if off of old bicycles. It's cheap and good for the environment.

Just a word of warning. Some robotics hobbyists, who use bike chain, have noted that...
Forum: Electrical 20-01-2012, 20:38
Replies: 6
Views: 1,017
Posted By Matt H.
Re: Electrical Visibility

There are a couple of rules relating to this:




It's also likely I missed some. What visible means is definitely a judgement call. In 2007 my team had to redo some of our electronics at our...
Forum: Technical Discussion 20-01-2012, 18:08
Replies: 1
Views: 1,084
Posted By Matt H.
Re: How to use extruded aluminum

Welcome to the forums. Extruded aluminum can be cut with any saw with a metal cutting blade. If you have one, a band saw works well. If you're a low budget team a hack saw works.

Extruded...
Forum: Technical Discussion 19-01-2012, 23:55
Replies: 5
Views: 1,538
Posted By Matt H.
Re: Treadin' all over the place

First off, I'm really excited that you're using treads. Not many teams do.

I spent a while looking for premade tank track for you and didn't find anything. FIRST operates in an odd size range. ...
Forum: Programming 19-01-2012, 23:12
Replies: 21
Views: 6,606
Posted By Matt H.
Re: Calculating distance with an Axis Camera 206

I second this question. If you can't get better estimates from the axis camera, you might try using the camera as a sanity check for an ultrasonic sensor.
Forum: Rules/Strategy 19-01-2012, 22:52
Replies: 27
Views: 3,932
Posted By Matt H.
Re: THE MOST ANTICIPATED ANSWER THIS SEASON!!!!!!

I get the feeling there aren't many basketball fans among us. 57ft is a shot from 10ft behind the half court line. When NBA players make shots like that they tend to miss.

Recruiting a...
Forum: General Forum 16-01-2012, 22:52
Replies: 18
Views: 3,615
Posted By Matt H.
Re: Andy Mark Super Shifters

It's rated for 60 oz which is 3.75 lbs.
Forum: Inventor 16-01-2012, 14:10
Replies: 8
Views: 1,100
Posted By Matt H.
Re: Possible Frame Design

I'm very concerned by the structure. What is the grey material your using in the frame?

Unless it's a ridiculous material, I predict that you'll have problems with the sides bending in/out of the...
Forum: General Forum 16-01-2012, 13:31
Replies: 18
Views: 3,615
Posted By Matt H.
Re: Andy Mark Super Shifters

It might be, but the performance won't be the same as pneumatics.

R48J limits you to Solenoids rated at less than 10 Watts continuous duty:



A quick look at McMaster-Carr shows that all their...
Forum: Technical Discussion 16-01-2012, 02:18
Replies: 16
Views: 3,965
Posted By Matt H.
Re: Stabilizing robot on bridge with gyro or accelerometer

For this post assume the Z axis is vertical and the robot drives along the Y axis.


The sensor has a resolution of ten bits. So your readings will be accurate to plus or minus 1/1024 of the full...
Forum: General Forum 16-01-2012, 01:41
Replies: 7
Views: 1,451
Posted By Matt H.
Re: Optimum Ball Mechanics

First welcome to the forums. Your question is hard to answer because optimum is a very fuzzy word. Do you want to maximize the distance the ball travels? Do you want to minimize the error in your...
Forum: Technical Discussion 16-01-2012, 01:25
Replies: 16
Views: 3,965
Posted By Matt H.
Re: Stabilizing robot on bridge with gyro or accelerometer

The gyroscope and the accelerometer are useful for different tasks. The gyroscope gives accurate angular velocity data. The accelerometer gives an accurate angle off vertical but is sensitive to...
Forum: Technical Discussion 11-01-2012, 11:18
Replies: 10
Views: 7,695
Posted By Matt H.
Re: Pitching Machine Physics

You're exactly right. I just mixed up radius and diameter. I'll be editing my original post.
Forum: Technical Discussion 11-01-2012, 00:50
Replies: 10
Views: 7,695
Posted By Matt H.
Pitching Machine Physics

I've seen several attempts to describe the physics governing a pitching machine. All of these attempts have been hard to follow and seem to miss the key point. Here I present a physical model of a...
Forum: Technical Discussion 14-02-2011, 23:05
Replies: 28
Views: 2,969
Posted By Matt H.
Re: 4" Wooden Mecanum Wheel

MIT is challenging, but also fun.

Working from http://www.engineersedge.com/screw_threads_chart.htm, tapping the threaded rods seems as though it will present its own set of difficulties.

Your...
Forum: Technical Discussion 14-02-2011, 17:36
Replies: 28
Views: 2,969
Posted By Matt H.
Re: 4" Wooden Mecanum Wheel

They make products for this situation!

Undersized Machine Screw Hex Nuts are made slightly smaller than regular hex nuts:
http://www.mcmaster.com/#undersized-machine-screw-hex-nuts/=b192e8

Using...
Forum: Pneumatics 29-01-2011, 00:14
Replies: 13
Views: 737
Posted By Matt H.
Re: Pneumatics piston

Alternatively you could use a sealed pneumatic (gas) shock as discussed in <R66-H>. They are available cheaply from McMasterCarr:
http://www.mcmaster.com/#gas-shocks/=asncje
Forum: Kit & Additional Hardware 12-01-2011, 18:54
Replies: 3
Views: 1,351
Posted By Matt H.
Re: Cross Hex Tube: am-0756

I believe this is what you're looking for:
http://www.andymark.com/productdetails.asp?productcode=am-0756
Forum: Technical Discussion 12-01-2011, 18:46
Replies: 14
Views: 2,023
Posted By Matt H.
Re: Attaching to the pole

<R92-P>
Forum: Extra Discussion 12-01-2011, 16:20
Replies: 31
Views: 5,977
Posted By Matt H.
Re: pic: 2791's Chassis

Looking at the spec. sheet for the batteries:
http://www.alliedelec.com/Images/Products/Datasheets/BM/YUASA/610-0002.PDF

The last graph gives discharge characteristics. The C-rate or CA on the...
Forum: Extra Discussion 12-01-2011, 03:08
Replies: 31
Views: 5,977
Posted By Matt H.
Re: pic: 2791's Chassis

Why did you choose to use six motors in your drive train?

4 CIMs at a 7.4:1 ratio gives a maximum of 634 in-lbs of torque at the wheels. With 4 inch wheels, that becomes ~315 lbs of force to...
Showing results 1 to 25 of 236
Page 1 of 10 1 2345678 > Last »

 
Forum Jump

All times are GMT -5. The time now is 07:14.

The Chief Delphi Forums are sponsored by Innovation First International, Inc.

Contact Us - Chief Delphi - Rules - Archive - Top

Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright © Chief Delphi