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Mike's ORDish Bot build

PostPosted: Wed Feb 15, 2012 7:44 pm
by mike
I was on the verge ordering parts to build a MendelMax printer when Bart first posted the original ORD Bot design.
After doing some quick napkin calculations to guess at MakerSlide sizes that would allow a build platform roughly the same size as the MendelMax, I put in an order at the MakerSlide store. (And found out later how lucky I was to get the order in while was in stock!)

I'm using the standard wheel carriage plates, and in the process of cutting out the motor & idler pulley brackets.
With luck, I'll be able to finish up and test the Z-axis tonight.

The build is definitely a work in progress, but I'm having a lot of fun figuring out how things will work.

Many thanks to Bart for creating MakerSlide & the ORD Bot design!
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Re: Mike's ORD Bot build

PostPosted: Thu Feb 16, 2012 4:55 pm
by Enraged
looks good! what electronics/extruder are you using?

Re: Mike's ORD Bot build

PostPosted: Thu Feb 16, 2012 5:20 pm
by mike
I'm using the RAMPS 1.4 shield & Pololu stepper drivers from UltiMachine and the MakerGear Plastruder.

Re: Mike's ORD Bot build

PostPosted: Sat Feb 18, 2012 12:09 am
by sdivad
Yes this is excacly what I was thinking.

Were the fastening angles also bought in the makerslide store?

My thingy is only 250mm so the buildarea is only about 160mm if I tweak the design a little
Yours is BIG :mrgreen:

Re: Mike's ORD Bot build

PostPosted: Sat Feb 18, 2012 7:07 am
by mike
The fastening angles are 1x1 and 2x2 corner brackets from Misumi. The build platform size could be as large as 247mm x 279mm -- I figure I can always cut things down but I have a hard time finding a way to stretch the extrusions ;)

The motors are mounted and the Z-axis operational. Next up: make the idler pulley brackets.

I was hoping to shoot a video of the Z-axis moving, but I think I've got a basic misunderstanding of the Sprinter firmware. I expected to see some movement after a simple "G1 Z 10" G-code passed to Sprinter... nothing happened. The motors turn if I run the RAMPS 1.4 TestCode.pde sketch, so I know the drivers are working... Any thoughts?

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Official Image

Re: Mike's ORD Bot build

PostPosted: Sat Feb 18, 2012 8:19 am
by BenJackson
All the limit switches are probably enabled and are expected to be wired "NC" so with them missing the printer continuously thinks it's hitting all the endstops.

Re: Mike's ORD Bot build

PostPosted: Sat Feb 18, 2012 1:31 pm
by JeremyBP
Do the motors make any noise at all? If the end stops aren't setup correctly in the firmware, the motors in all axes should only move in one direction. I'm not sure how picky Sprinter is about its g-code, but try giving it a feedrate. For example, G1 Z20 F160.

Re: Mike's ORD Bot build

PostPosted: Sat Feb 18, 2012 1:54 pm
by bdring
It is most likely your limit switches. On the RAMPS, a quick solution it to short out the pins using a standard push on header jumper. You might be able to steal one off an old hard drive. You can fix it in the controller software, but this is only temporary, so why change the software twice.

At that length you will probably get some whip in the lead screws when the z is low. I would make a simple keeper at the top. it can double as a thrust bearing. You could use some shorter screws until you are printing, then print some keepers for the top.

Edit: ....or just keep the Z slow for a while

Re: Mike's ORD Bot build

PostPosted: Sun Feb 19, 2012 7:01 am
by mike
Many thanks for the suggestions -- turns out I had the wrong motherboard setting in the Sprinter configuration...
Missed that it should have been 33, not 3 :oops:

In any case, got the Y & Z axes working!

Re: Mike's ORD Bot build

PostPosted: Sun Feb 19, 2012 1:22 pm
by JeremyBP
Congratulations!