Stepper Motors

[jason udallParticipant @jasonudall57142]

This is not going to include any functional printed parts..

Ball screws and recirculating linear slides..

Think machine tool build

But at 400mm cube (600 mm throw)..it might need a bit better motions eh?

Plan is to run build area at upto 200C…that should improve lamination and reduce

shrinkage skew. ..

Edited By jason udall on 09/01/2015 21:07:59

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Neil Wyatt on 09/01/2015 20:34:45:

> For my pennance, here is a link to one implementation of an Allegro device.

£18 to cover conversion from SMT to DIL (retrograde step if you ask me) and add four resistors and a capacitor!

.

Neil,

" … one implementation … "

I was citing it as an example, not doing a Value for Money analysis.

MichaelG.

[Neil WyattModerator @neilwyatt]

Having bought five of those stepper boards I'm still to try one out. Realised I have no idea of he pinout… so did a bit of digging.

They are clones of the Pololou board, and if you want to know the pinouts and much more look HERE

Neil

[jason udallParticipant @jasonudall57142]

Neil..and others. .
Have a care when setting up some of the polou clones. .for example stepstick..the voltage vs coil current is not always the same..( reference resistor differs thus current/voltage ratio)…definitely get the right procedure for the boards YOU have…

[Neil WyattModerator @neilwyatt]

Thanks Jason,

Last night I found this page:

**LINK**

It points out that the standard board uses a resistor that give a maximum current of over 4A!

Mine is the same as the one in the picture (note the ghastly new coding system where 30C means 20K!) I'll follow the advice in the 'upgrade' section and swap in a 100K resistor, as my stepper is rated at 24V/800mA.

Neil

[Les Jones 1Participant @lesjones1]

Hi Neil,
Thanks for pointing out the new SMD resistor coding system. This is the first I have heard about it so I "Googled" it. I assume you meant to say 30C means 30K (Or 20C mens 20K)

Les.

[Russell EberhardtParticipant @russelleberhardt48058]

Posted by jason udall on 09/01/2015 21:02:35:

This is not going to include any functional printed parts..

Ball screws and recirculating linear slides..

Think machine tool build

But at 400mm cube (600 mm throw)..it might need a bit better motions eh?

Plan is to run build area at upto 200C…that should improve lamination and reduce

shrinkage skew. ..

Edited By jason udall on 09/01/2015 21:07:59

Sounds as if this should make an interesting article or build thread in the 3D printing section.

Russell.

[Neil WyattModerator @neilwyatt]

Hi Les,

No the new 1% system is really odd. 30 stands for 200(!) and C stands for x 100 so 30C means 20K.

Essentially you will have to keep the chart handy and perhaps memorise a few common ones.

Neil

[Les Jones 1Participant @lesjones1]

Hi Neil,
I should have read the document I found properly rather than just skimming through it. Although it seems illogical it does reduce the number of characters reqired to identify the ever smaller components.

Les.

[Neil WyattModerator @neilwyatt]

Who would have though you would need a loupe to do electronics, thirty years ago!

Neil

[MuzzerParticipant @muzzer]

I see that NYC CNC has posted a set of videos recently covering the use of Arduinos with the GRBL "shield"(yuk) to make a simple CNC machine. Well presented intro and real world example. Possibly quite timely for this thread.

Murray

[jason udallParticipant @jasonudall57142]

Who would have though you would need a loupe. ..not just me then…
Didn’t expect to need the dissecting ‘scope for electronics

[jason udallParticipant @jasonudall57142]

Russell. .that thought has crossed my mind..but this is for a customer. .though with permission maybe.

[Neil WyattModerator @neilwyatt]

"Shield" is bad. Beaglebone has 'capes'. Raspberry Pi has 'Hats' but the RPi based Pi-top goes one better and has 'Pi-Top hats'.

In my day you got an 'expansion board' and were happy!

Neil

[jason udallParticipant @jasonudall57142]

Shield..pun ..board usually sits above arduino…but is specifically shielding the arduino from “real world signals and levels”…
The other names are just continuing the ( week) joke.
Ignor it . It might go away

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