my build from the start

**h4ppy-chris** · 23-12-2010

Originally Posted by irving2008

What motors are those Chris?

Bipolar NEMA 23 case size. Rated current 1.2A, holding torque 0.314Nm(3.2kg-cm). Rotor inertia
0.55kg-cm2. Detent torque 0.0492Nm(500g-cm). 4-connections flying lead 115mm long terminated with a .1"
pitch SIL header type socket. Output shaft 6.3mm dia x 19mm long. Body 56.5mm dia x 40mm long with 57mm
square mounting face haveing a 5.2mm dia mounting hole in each corner on an approx 47mm square.

**irving2008** · 23-12-2010

Chris... just what do you plan to do with those motors?

**h4ppy-chris** · 24-12-2010

nothing atm irving i think my 1st thing i will do is convert my milling mc to cnc :)

**irving2008** · 24-12-2010

oh right, just those are very lightweight motors and I was wondering about your expectations of them...

**h4ppy-chris** · 26-12-2010

well i tested the temperature 54c

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my 24v supply turned up

when its all running should it sound like 56k modem?
can any one recommend a program to start with for gcode.

**Jonathan** · 26-12-2010

Originally Posted by h4ppy-chris

when its all running should it sound like 56k modem?

Yes, mine does too. Could get it to play a tune if you tried...know the frequency from the step rate. Got three 'instruments' (motors) so could even do some interesting harmony...

**M250cnc** · 26-12-2010

Originally Posted by Jonathan

Could get it to play a tune if you tried...know the frequency from the step rate. Got three 'instruments' (motors) so could even do some interesting harmony...

There have been some Christmas tunes on the zone in the past.

Phil

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**h4ppy-chris** · 28-12-2010

what motors should i be looking for? the board i bought is the 2.5amp and 24v PSU.

**Jonathan** · 28-12-2010

Originally Posted by h4ppy-chris

what motors should i be looking for? the board i bought is the 2.5amp and 24v PSU.

Depends greatly on the size of your machine, are you using ballscrews/ACME etc. With only 24v you want a motor with very low inductance to get any reasonable speed.
reccomended v=32*L^0.5, so rearranging that:
L=(24/32)^2=0.56mH
So your looking for a motor with an inductance ideally lower than 0.56mH, and sufficient torque...you'll be lucky to meet those criteria so just find as close as possible.

Hope that helps...