[Chris D]

How did testing go on Friday? Only asking because I am getting close to needing the new drives

Chris

Update: The G250 and G251 panels arrived this morning. The stencils arrive tomorrow. Today will be spent programming the Juki pick-and-place machines with G250/G251 component data (tedious hand-entered data keyboard work) and a test placement will be run on a board taped with clear double-sided adhesive tape to verify correct parts placement. A first panel proof will be run-off, reflowed, washed, JTAGed and tested tomorrow or Friday (April 17 or 18).

Mariss

[the4thseal]

just checking...the 504 does not need a break out board. i think i saw that in the thread and am now getting confused.??? help i still want one even now that i a confused.

[wolfdagon]

The drives are G250 ("dirt cheap") and G251 ("cheap") which are essentially the same except one or two very small differences. The G540 (not 504) is a break out board and enclosure which includes four of the drives. If I understand correctly, with the G540 you simply connect your motors and power supply and use a printer cable to connect it to the computer.

[the4thseal]

that is interesting

[KYYADA]

Post 245 has a picture of a G540

[the4thseal]

i am sorry i did not find this , so you just add power..... right??

[CoAMarcus]

You connect your motors with a DB9 cable (one for each motor), connect to the computer with the parallel cable, and connect power and you are good to go.

-Marcus

[bobchiloquin]

Marcus,

I gather this means all these steppers we've been buying will have to have DB9 connectors soldered to them. So which wires go to which pins?

Bob Hayes

[acondit]

Marcus,

I gather this means all these steppers we've been buying will have to have DB9 connectors soldered to them. So which wires go to which pins?

Bob Hayes

Look at post #320. Mariss posted a schematic for the G540 showing the DB9s.

Alan

[skmetal7]

updates we're dying here!

[alipavsky]

Look at post #320. Mariss posted a schematic for the G540 showing the DB9s.

Alan

There's actually a much more legible PDF in the files section of the Yahoo group.

[dansutula]

For dual-screw applications, is it possible to run two steppers with a single cheap drive? (assuming that current limitations are not violated)

[keebler303]

For dual-screw applications, is it possible to run two steppers with a single cheap drive? (assuming that current limitations are not violated)

No, one motor, one drive.

However, with a G540, you could run two X axis motors a Y and a Z as there are 4 drives in the box.

Matt

[Kipper]

There's actually a much more legible PDF in the files section of the Yahoo group.

Yahoo Groups... uke: Horrible navigation.

[joecnc2006]

No, one motor, one drive.

Matt

Not true, Yes you can run two motors from one drive, I did it with the 201's with no problems for testing, However, it is not recommended. Look in the Gecko section you will see a discussion on it, there is a thread dedicated to this. Try a search.

Joe

[alipavsky]

Yahoo Groups... uke: Horrible navigation.

Ok, look here for post #321. The PDF is attached there as well. Right now, it's on page 20 so, if you're quick, you don't have to navigate too much.

- Andrey -

[keebler303]

Not true, Yes you can run two motors from one drive, I did it with the 201's with no problems for testing, However, it is not recommended. Look in the Gecko section you will see a discussion on it, there is a thread dedicated to this. Try a search.

Joe

Thats what I meant. Sure you can, but you run the risk of smoking a motor and possibly a drive in the process.

Matt

[Mariss Freimanis]

You won't smoke the drive and you won't smoke the motor. You will however get miserable performance at speeds above 3 revs per second.

Mariss

[keebler303]

Mariss

Couldn't you smoke a motor by connecting them in parallel? The drives current limit would be set to twice the rating of one motor. Any mismatch in resistance (thermal effects or other) would cause the current to be split unevenly, with worst case being full current through one motor. Maybe this could be avoided by using a series connection?

What exactly prevents this from working properly? just curious.

Matt

[wolfdagon]

Mariss

Looking back I see that it has been about two and a half weeks since testing of the G540 prototype began. How about an update on the results so far?

Kenith