No, I don't mean the end of the world.
I'm starting to wonder when the end of the GW eco-scare will happen. As far as I can remember the Ice Age eco-scare of the 70's just faded away. I don't...
Type: Posts; User: Madclicker
No, I don't mean the end of the world.
I'm starting to wonder when the end of the GW eco-scare will happen. As far as I can remember the Ice Age eco-scare of the 70's just faded away. I don't...
The answer to your question is yes, it's probably possible to chop the current using hall effect sensors as the current detectors. I wouldn't do it that way for a motor drive. For one thing resistors...
Getting the "pieces" is a trivial part of the process. In order for the "guys to get their paper" the shop has to qualify the process. That's the first step. I assume the place you work doesn't do...
You have 2 axes to control. Why even try to control one without controlling the other?
This is just a simple problem of controlling the feed speed and the height of cut.
Sounds like you just...
I don't think there's any option better than rack and gear. Do they even sell screws that long?
Short answer is no.
I don't think you can go wrong with the hitachi that many here have used. I have personally used it through several sets of brushes.
A die grinder is a tool meant for a different job.
I sure hope the rest of the world doesn't blame us for AG. I did all I could do by not voting him president.
Gotta luv the nobel prize, though. Cheapens it to worthlessness. Almost as bad as...
I got my first one in welding school in '74. The employer always paid for the tests after I started working. I guess you could pay a testing lab to certify you. Trouble with that is it's a procedure...
Here's one sculpted into a dragonfly:
http://www.youtube.com/watch?v=FRkj53QTCYE
Some people have too much free time.
Here's a wiki entry for these things:
...
After thinking about this without Friday night beers, I realize I was way off in the weeds. This contraption works by simple EMF forces. The current in the wire creates an EMF that works against the...
Simple. The keywords are "lightly touching" and "properly tuned". The base of the magnet and the top of the battery are the commutator contacts and the current is just switched on and off. Current...
Steppers don't need limit switches. They stall happily. I have a 1300 oz/in on my main axis driven by a wide open gecko and stalls have never caused any damage.
If you run servo's you better have...
The replacement brushes have a wear line on them...about 3/8" from the end. I don't remember how the originals were marked, maybe a line, maybe stepped. I'll locate the manual and see. I know it was...
Yep, it's the brushes. They are a consumable and burn up. I have the same router and have been through several sets now. The router still runs strong, but I never push it past a 50% duty cycle...1...
This is a good router for the money. Just watch the brushes. I'm at the end of my 3rd set in about 1.5 years. Not sure how many hours, but it's been a bunch.
It's not the melamine that chips, it's the chipboard. I cut hundreds of feet of melamine MDF every month and never have any chipping problem. I've also cut plenty of particle board melamine and it...
This is my choice for a home machine. It takes real welding skill, but it provides quality welds if the user is up to the task. MIG welding requires a pretty good skill level to make quality welds...
Superglue works well on soft areas. You can also buy an accelerator.
Frankly, even though this is obviously spalted maple, I don't think it rates a showcase spot in a project.
FET's are just electronic switches. There is no way you'll learn the theory of operation in a forum. There are just too many variables and nuances between the different devices.
The one concept...
I wouldn't hold my breath waiting for that to happen. In spite of all the doomsayer's shrill screams, I think you'll turn blue first.
I found one link:
http://cnczone.com/forums/showthread.php?t=15270&page=3
It's on Steve's thread about half way down the page. Not exactly how I did it, but the principle is the same. There are...
The cables and pulleys are the way to go to keep the gantry moving square. I don't know what you came up with, but I used "by the foot" hardware store cable and those sliding door bearings. I used...
Those joints are supposed to be strong enough, but there's no pretty factor to them and we're back to the point that a stationary table is the best way to use them. I just use rabbet joints for all...
How about "lovetails":
Lovetails
Best to mount the spindle horizontally. I was going to build a cnc multirouter until this thread was brought to my attention:
http://www.cnczone.com/forums/showthread.php?t=13169
Still,...
You can't increase the speed of a free falling mass by increasing the mass. One of Newtons laws. That feather and apple thing. Or was that William Tell?
The potential energy is increased linearly...
What are all those resistors for? You need to pull the signal up. Series resistors drop the voltage. Also, I would use opto isolators on key signal lines.
Stepper Motor Sizes
Motor Case Sizes - Size 17, 23, 34, 42. These are NEMA (National Electrical Manufacturers Association) standards for the motor case front view and the mounting flange holes. ...
physicist? Or Physicist?