Re: [CAD_CAM_EDM_DRO] What steppers?

Henrik Olsson,

On my 4' by 4' machine I use 350 oz/in stepper motors. The lead screws are
4 turns per inch.

More turns per inch increases your power, but reduces your speed..

Bob Campbell

----- Original Message -----
From: "Henrik Olsson" <henrik-olsson@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, April 20, 2001 12:53 PM
Subject: [CAD_CAM_EDM_DRO] What steppers?


> Hi all,
> I'm at the beginning of building a new small 'mill' and I'm on my way to
> find some steppers. The problem is I don't really know how much torque I
> should aim for. There is the 210 oz-in at Camtronics that looks good to me
> but I don't know if it will be enough.
>
> The base will be buildt from BOSCH's and ITEM's heavy-duty aluminum
> extrusions, concrete filled if necesary. It will use linear ways and
> ball-bearing slides (2 per axis). The leadscrews will be 16mm ballscrews
> with 4mm pitch and the table will be 180x500mm (~7"x20") T-Sloted aluminum
> plate 20mm thick.
> My aim is to be able to cut holes in and engrave aluminium 2-3mm thick and
> cut plastics etc. But it would be nice to able to do some 'real' milling
in
> aluminum. The motors will be direct coupled to the leadscrews.
>
> So, my qustions to you guys is: What steppers should you choose if you
were
> building a machine like the above? Right now I have drivers capable of 2A
@
> 40V (L297/298) but if heavier is necesary I will just have pay the money
get
> some better drives. It would be good though to use the 2A drives.
> Dan Mauch says that the motors (210oz in) will have plenty of power if
used
> with a 20tpi screw but I'm just not sure how it will perform with 4mm
pitch
> ballscrew.
>
> Thanks for your input!
> /Henrik Olsson. Sweden.
>
>
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