rs stepper motors

[John S]

Nope, Page 2
5 volt 0.5 Amp , 5mNm in a type 17 frame, that means 17 needed to get a decent erection.

[irving2008]

Nope, Page 2
5 volt 0.5 Amp , 5mNm in a type 17 frame, that means 17 needed to get a decent erection.

Must be these new glasses....

RS440-420 5v, 0.5A, 10ohm, detent torque 5mNm, holding torque 70mNm

[John S]

Lend us them glasses

I blame these new fangled measurement why can't they just say 10 oz in and we all know then that we are talking about quick setting custard.

.

[Robin Hewitt]

I blame these new fangled measurement why can't they just say 10 oz in and we all know then that we are talking about quick setting custard.

5mNm is 0.7 oz.in

Rice puddings only, finer particle colloids will probably defeat it :naughty:

[John S]

Irving is correct, those motors are 5mNm detent torque which is the power needed to overcome the parked position.
Holding torque which is 70mNm or 10 oz/in is the normal method of sizing steppers by torque.

Still puny in anyone's book, more suitable of positioning that cutting under a load.

[irving2008]

Back to the OP requirements and our collective pragmatic experience, what would we suggest as regards these motors for 'cutting balsa wood up to 1/4" thick"?

It would seem he has a few of these available (work parts bin?), but obviously traverse speed and depth of cut is going to be severely limited even with a fast spindle and a single flute cutter.

The likely use is repetitive cutting of wing rib parts (I know that was the bit I never managed to get right often enough) but is the OP on a hiding to nothing or should he at least give it a try.

Constructive views?

Personally I'd give it a go as a learning exercise, but not be too dissappointed that I'd need to upgrade to bigger (NEMA23) motors pretty much straight away.

Chaz, can you tell us more about the rest of your router design?

[templecorran]

Don't want to rain on anyone's parade, but 5mNm is about enough to pull the skin off a rice pudding so long as you get in quick before it congeals :whistling:

Sorry Robin,
What data sheet you looking at?
http://uk.rs-online.com/web/search/s...-420&x=15&y=12
The page for this motor shows 70mNm, apart from that I agree totally, well perhaps it would move it semi congealed:heehee:

[Robin Hewitt]

I refer the honourable Gentleman to the reply I made earlier :heehee:

[templecorran]

oh holy crap

[templecorran]

oh holy crap

is a quote from Achmed the Dead Terrorist, played by Jeff Dunham.
OKOK It only took me 14 hours to remember where I heard it before!