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My Dual Wire Gantry Printer

Posted by Celcius1 
My Dual Wire Gantry Printer
April 06, 2018 07:24AM
Hey Guys,

Here are some pics of my printer I am building (excuse the mess).

It has a build area of 350mm x 350mm x 410mm (Just measured the height of the print area), I use a Dual wire gantry for the X and Y movement, and its nice and sweet. and yes those are NEMA 23's yes I know its overkill but its what i had spare on the shelf!

I dont know the full height of the Z axis as I have yet to implement the Z lift, which I've ended up using good old leadscrews for. It's next on my list to get working smiling smiley I made the heated bed myself.

When the printer has a bit more complete I'll post some more pics.

Talk Soon
Celcius1

Edited 1 time(s). Last edit at 04/06/2018 07:36AM by Celcius1.
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Re: My Dual Wire Gantry Printer
April 30, 2018 08:32AM
Well Update:

I have the printer dialed in and calibrated, she prints beautifully, with a 0.1mm to 0.05mm error, which helps with tolerance, but looking to run the makers muse tolerance guage for a a full test.

Talk Soon
Peeps
Re: My Dual Wire Gantry Printer
April 30, 2018 11:52AM
It doesn't seem to matter, when the fishing line runs up/down along the stepper shaft?
Can you tell more about the specs of the line? How many turns around the shaft to keep it from slipping?
How did you tension both lines equally?
Re: My Dual Wire Gantry Printer
June 25, 2018 11:47AM
Glad to see someone trying out string again!

The optimal number of wraps for a cable transmissions is:

F(hold) = F(pull)*e^-(Mu)*(theta)

Mu = friction coefficient between the cable and capstan (pulley)
Theta = wrap angle (one wrap = 2*pi in radian) # of wraps

If you know the required torque for your application, the motor gear ratio, the tension differential between the two terminated ends (Fhold/Fpull), and Mu, you can solve for theta which will give you how much to wrap the cable around the capstan.

Edited 1 time(s). Last edit at 06/25/2018 11:47AM by banana_muffin.
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