Search:

How about an el-cheapo optical wheel with holes (Few bucks?) on the shaft? Two movements on the cheap optical without reasonable feedback from the expensive encoder means you're heading for disaster....

BTW, that is a 5000mm set that has two 94" rails. I confirmed with seller before I decided that there wasn't anything that I saw myself building in the future that could possibly make use of all...

Monster sized long rails.
My wife would kill me if I bought them.
I see previous history of sales of this item have sold for as low as $57 !!!
Would love to see what a Zoner would do with them.
...

I have run across PC power supplies that need a 100ma trickle charge on +12V (i.e. 100 ohm 2+ watts) to keep a stable regulation. A slow digital voltmeter may be giving you an inaccurate reading on...

Still wondering what method you emply to accomodate temp change length of screws.

Maybe one end fixed and the other that can expand/shrink axially into a keyed/spline?

GM management vx MS management

A pox on both their houses.

had no idea what to search on , tried something, and promptly hung my firefox. Won't be back.

Man I sure hope you do a build log.

Are you paying someone to build it or doing it yourself?

Would love to see the details of your design.

Such as dual drive or single on lthe 2m/3m axis's?
I assume servos instead of steppers?
Ballscrew/nuts P/Ns?
How do you handle thermal expansion...

Either gouging or maybe they're trying to send you a message to upgrade from a sneaker-net?

"industrial surplus dealers" and "brokers"

Web based? Local places to you? Names?

so on Flickr site you show 3 plates done by BBS. Curious as to what they charged you for that?

Boy there are loads of them from China/Singapore. I take the worse case assumption that these things wouldn't be pulled from a Chinese CNC until they are well worn out.

OTOH, it's possible that...

"Not counting my time, materials for a more elaborate sytem with ball screws, Mach3, Rhino, solid steel frame, full access table should run about $6k."

Hey I'm kinda thinking about the same type...

Do you have a child in kindergarten thru college? If so maybe they would be interested in learning Autocad and maybe they would let you use it.

...

I would like it, especially IF it fixes some of the things I hate about Ebay.


1) The capability for memebers to discuss the items publicly while the auction is active. This is a BIG one!!!!!!
...

Well I don't think I "bashed" your idea but I do think it was good for the thread that all the caveats, hacks, and dangers are now fully in the open. That way it keeps people from having the...

Tai42, yep, or simply doing a ohmage between output ground(black wires) and the third round prong ground contact of input 120VAC you will find that it is probably 0 ohms. Thus when you connect the...

Project5K said........."converting 9 computer powersupplies and then linking the 5v lines in series to give me 45v and 25A"

Careful. Do you know this works? Standard PC power supply has its...

My decision got easier when my 8th grader son decided he was interested in learning CADCAM and got a full function 2year academic license for $69.

Stay in school and get the piece of paper. You'll never starve with that. Use your years in school to find another 3-5 folks who want to start a business straight out of school. You've all learned...

I guess I'll ask the obvious....

Isn't a machine like this worth 100K$+ and worth a lot of $/hr?
Sems like you'd want a designer that would convert and tune this machine to the max speeds...

Thanks for the replies. Looks like I worried too much.

Well let me get to the M$ question, do known brand new THK's have any kind of hand engravings on the bottom of blocks?

My "NEW" HSR25s arrive with engravings (and some even scratched out and rewritten) on the bottom side of trucks in corners. Obviously hand engraved.

Engravings such as C0 and -2 and 762 on 3 of...

So how much and where would someone get such a report at?

Thanks Richard. I read your comments as saying if I was making a Y-axis sled design things would be OK, but any other common y-axis style would be working in a reduced capability range of the...

Read 5Bears talk about THK bearings and SR spec but I'm still a little confused.

Continued mention that SR is best for "horizontal guideway".

Would that allow me to use it on the Y axis if I...

Here's a great deal.....not.

By the picture he's got crates of them....patience.