Re: OOPS! Need bigger stepper motors

I see a possible problem here, could some of you that are more
familiar with the 298 chip set confirm if the current drive of this
chip is 2 amps not 4 amps.

Also i see a rating below of 45 volts input voltage. Did the guy who
designed this board give you this number. I took a quick look at the
schematic on the web site you gave. One thing that worries me is
there is cmos logic on the board. I can't tell if it is powered by
5vdc or 12vdc.

I think the voltage rating of the 298 is around 45 volts but it would
not hurt to check the voltage rating of the 470uF caps on the board.


Wally K.

--- In CAD_CAM_EDM_DRO@egroups.com, "Gary " <m1911bldr@a...> wrote:
> Alan was gracious enough to suggest bigger stepper motors than 100
> oz/in. I still need a source for something along the line of 300
> oz/in, 12 or higher VDC (40 volts max). Anyone got any ideas?
Alan
> the URL to Hans' home page is: http://hans-w.com/. I have run the
> system using small stepper motors and DANCAM and I am very happy
with
> the performance, especially considering the total cost has been
around
> $100.oo for everything needed to run 4 axis CNC. Except the motors
> and machine mods, of course. Hans' boards use L297 and L298
chipsets
> and the boards are capable of 4+ amps per motor and almost 45 VDC
per
> motor. Overall I am very happy with Hnas' boards and would suggest
> them to anyone just getting involved in CNC. Just need a source of
> useful motors. Anyone have any experience with running steppers at
> voltages higher than their ratings?