RE: [CAD_CAM_EDM_DRO] Re: Mini-Mill ball screws/nuts AND CNC Router project

I run 20mm pitch screws. Forget microstepping. A stepper can hold a half
step against a light load, but anything else is wishful thinking.
I get about 600RPM on the motors. I work on a resolution of 0.05mm
It cuts Al to about +- 0.1mm
There's some video of it moving on this page.
http://www.cncathome.com/router.html
PK


-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of gcode fi (hanermo)
Sent: Wednesday, 4 June 2008 4:37 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Re: Mini-Mill ball screws/nuts AND CNC Router
project

WOW !
Paul - With what resolution and rpm on the steppers ?

At even 0.01mm resolution (using microsteps, but lets leave that out for
now)
Thats 0.01 mm x 100 (==mm) x 1000 (==m) x 15 / 60 (==secs minutes to
seconds) = 1.5 M / 60 = 25000 steps /sec or 25 kHz.
At 1600 steps / rev = 16.625 revs/second or 937 rpm.

0.01 mm for wood router with 8 microsteps gives about 0.1 mm accuracy -
plenty good enough for wood.
What steppers do you use that you can get 16 revs/sec on only 24 V ?

Or do you use a lower resolution ie more gearing ?

Paul Kelly wrote:

>
> I get 10-15m/min rapids on my little router (250OZ.in motors and my
> version
> of a xylotex drive at 24V).
> PK
>
> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com
> <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>] On Behalf Of Dan Mauch
> Sent: Tuesday, 3 June 2008 11:42 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>
> Subject: Re: [CAD_CAM_EDM_DRO] Re: Mini-Mill ball screws/nuts AND CNC
> Router
> project
>
> About 15 years ago I went to a surplus store and located 50 sets of 2
> each,
> new in their shipping cartons,Thompson accurride linear slides worth back
> then $125 ea. I bought them for $20 a set. At the same place they had new
> ballscrews with dohble antibacklash nuts. I got all of those for $15 each
> and got about 30 of them.
> I sold most of them but kept a couple sets for my own use. The router
> was a
> perfect place to use the Thompson slides. I still have a couple sets
> left by
> have plans for them also.
>

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