Dual drive upgrade, one axis still free

Discussion of tinyG control platform
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Guile2912
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Joined: Tue Mar 26, 2013 8:59 pm

Dual drive upgrade, one axis still free

Post by Guile2912 » Wed Mar 27, 2013 12:31 am

Hello,
I would like to use the tinyG so that I can mill and 3D print with the same board. ( 4th axis is for the extruder )

So would it be possible to have a dual drive configuration that way ? only using 3 axis, keeping the 4th one for the extruder ?

Thank you very much for your help!

WillAdams
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Re: Dual drive upgrade, one axis still free

Post by WillAdams » Wed Mar 27, 2013 1:47 am

While there are electrical / electronic considerations which argue against it, a number of people have successfully wired two motors into one stepper-driver:

http://www.shapeoko.com/forum/viewtopic.php?f=4&t=626
(link from the dual-motor page on the wiki)

An alternative is to use a drive shaft instead:

http://www.shapeoko.com/wiki/index.php/Drive_Shaft

which is what I've been working on.
Shapeoko 3XL #0006 w/ Carbide Compact Router w/0.125″ and ¼″ Carbide 3D precision collets
Nomad 883 Pro #596 (bamboo)

Guile2912
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Joined: Tue Mar 26, 2013 8:59 pm

Re: Dual drive upgrade, one axis still free

Post by Guile2912 » Thu Mar 28, 2013 1:40 am

I didnt know about the driveshaft update, thank you very much for pointing that out.
As some people tryed having two motors on the same driver, I will give a try and see. I guess that with the nema 17, it should be ok, as the tinyG allow 2.5 A per winding.

Althiels
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Location: Newburyport, MA

Re: Dual drive upgrade, one axis still free

Post by Althiels » Thu Mar 28, 2013 5:10 pm

I have a tinyg and am also interested in adapting the machine for 3D printing. I was thinking about just setting up a seperate control box and using connectors to switch the motors back and forth for going between mill and 3D printer. How are you going to control the extruder and heater with the tinyG? what type of extruder/hot end are you going to go with? Are you going with PLA instead of ABS so you can avoid the extra heated bed? I would be pysched to see project notes on this and wish you luck!!
Serial #: 1295, DW660 Router, TinyG controller, Dual Y Motors, ACME Z-Axis - First Cut - 2/19/2013

WillAdams
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Re: Dual drive upgrade, one axis still free

Post by WillAdams » Thu Mar 28, 2013 5:43 pm

There is a bit on the wiki here:

http://www.shapeoko.com/wiki/index.php/ ... ting_Mach3

and I believe there's been some discussion on the forums --- ISTR a 3D printed shark.... ah, here we are:

http://www.shapeoko.com/forum/viewtopic ... 172&p=9352

William
Shapeoko 3XL #0006 w/ Carbide Compact Router w/0.125″ and ¼″ Carbide 3D precision collets
Nomad 883 Pro #596 (bamboo)

Guile2912
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Joined: Tue Mar 26, 2013 8:59 pm

Re: Dual drive upgrade, one axis still free

Post by Guile2912 » Thu Mar 28, 2013 6:34 pm

I had 2 ideas in mind.

1/gnexLab Extruder Controller
As Will point out, a gnexLab Extruder Controller ( when they will have them in stock, because for now, they are changing there chinese supplier ) would do the job to controller the extruder and bed temperature.
It is quite cheap also $59 (gecs2tcl http://cnc2printer3d.wordpress.com/gecs2tc1/)
  • +Thermocouples better than termistors
  • - but only mofsets means 12V for heaters, so as I guess you work on 24V, you need a dedicated power supply
  • Has 2 potentiometers to set the temperatures
The $125 (gec2.1 http://cnc2printer3d.wordpress.com/gec2-1/)
  • Thermocouple for extruder, but termistors for the rest
  • + Also mofsets, but offers relays, so that your heater + bed can be plugged to your 24V power supply, no need for an other one.
  • + Nice graphical screen with buttons to navigate and operate
The nice thing about it is that you dont have to change your connections, is not that expensive and you keep working with the TinyG.

2/ Rambo card
My second option, was to use a Rambo card http://reprap.org/wiki/Rambo ($190)
  • All in one : motors, extruder, heat bed
  • Double extruders supported
  • Works with 24v
But I have not yet found every infomation about it ( would it support the dual drive configuration ? Could I plug the dual drive configuration on the Z driver wich has 2 drivers on the board and tell the software about it ?)

About the extruder
I would use a modified QU-BD extruder because I can't print one, I want something that last, and the stock one seems to have problems :
  • Using a heater cartidge (stay in place + heat faster)
  • Change the Drive gear to a makerbot7
  • Add a filament Idler
Full explication can be found here http://store.qu-bd.com/product.php?id_product=11

Heat bed
Qu BD has tons of them ( small, big, 12v, 24v) with termistors build in http://store.qu-bd.com/category.php?id_category=19

Althiels
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Re: Dual drive upgrade, one axis still free

Post by Althiels » Thu Apr 04, 2013 7:03 pm

That is a very cool idea that I had missed on the wiki, thanks a ton for breaking it down for me. I'm going to look into using a relay or mosfet shield with an uno as a possible solution too.

For my 2/ I was thinking of the printrboard, it seems to get great reviews. The down side is having to switch to 12V. I am looking at this website, but am not sure if it is a knockoff and would be betting to get it directly from printrrbot: http://makemendel.com/

I've been going around on an extruder and keep coming back to the Qubd despite the issues that people have with it. tough call
Serial #: 1295, DW660 Router, TinyG controller, Dual Y Motors, ACME Z-Axis - First Cut - 2/19/2013

Althiels
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Joined: Mon Jan 28, 2013 2:59 am
Location: Newburyport, MA

Re: Dual drive upgrade, one axis still free

Post by Althiels » Wed Apr 10, 2013 1:26 am

Alden has a good response to some of the considerations that are necessary to use the tinyg for extruder control under the tinyg vs. grbl post. I'm thinking that one could set up an ssr and pid control with an arduino for the temp part of it, but I am not sure about the rest. Has that been looked at in the tinyg firmware? Does the software for 3d print gcode generation take care of it? Slic3r?
Serial #: 1295, DW660 Router, TinyG controller, Dual Y Motors, ACME Z-Axis - First Cut - 2/19/2013

vexpertise
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Re: Dual drive upgrade, one axis still free

Post by vexpertise » Fri Jun 02, 2017 6:30 am

I would use a modified QU-BD extruder because I can't print one, I want something that last, and the stock one seems to have problems :

Using a heater cartidge (stay in place + heat faster) 3d printing mumbai
Change the Drive gear to a makerbot7
Add a filament Idler

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