Custom ShapeOko Design

discussion of design changes / improvements / suggestions
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northbear
Posts: 254
Joined: Mon Apr 09, 2012 9:21 pm

Custom ShapeOko Design

Post by northbear » Mon Aug 13, 2012 7:29 pm

** edited 8/15/2012 --- I re-read this and decided to remove my many words ***

Below are several pictures.
I welcome any comments or questions! Hopefully someone will find this of use and thanks again for all those who have helped me get this far!
1 iso.PNG
1 iso.PNG (218.91 KiB) Viewed 3426 times
2 iso.PNG
2 iso.PNG (154.57 KiB) Viewed 3426 times
rear iso.PNG
rear iso.PNG (115.46 KiB) Viewed 3426 times
Last edited by northbear on Thu Aug 16, 2012 2:16 am, edited 3 times in total.
My buildlog is here

northbear
Posts: 254
Joined: Mon Apr 09, 2012 9:21 pm

Re: Custom ShapeOko Design

Post by northbear » Mon Aug 13, 2012 7:31 pm

A couple more pictures
sec veiw iso.jpg
sec veiw iso.jpg (118.02 KiB) Viewed 3424 times
x gantry iso front.PNG
x gantry iso front.PNG (64.38 KiB) Viewed 3424 times
x gantry iso rear.PNG
x gantry iso rear.PNG (59.68 KiB) Viewed 3424 times
My buildlog is here

willo
Posts: 34
Joined: Fri Jun 15, 2012 3:09 pm

Re: Custom ShapeOko Design

Post by willo » Mon Oct 01, 2012 3:39 am

If you're going to beef up the machine that much, lose the direct drive to the Z motor.
Add a belt drive to the Z axis and use at least a 2:1 ratio. You'll increase the torque for the Z axis.

If you raise the work surface, you could even attach a piece of extruded aluminum across the bottom of the Y plates for even greater stiffness.

Just some thoughts. You'll also find that the drag chain won't bend as severely as in the rendering. I attached mind to the top of my Y motor mount.

northbear
Posts: 254
Joined: Mon Apr 09, 2012 9:21 pm

Re: Custom ShapeOko Design

Post by northbear » Mon Oct 01, 2012 9:31 pm

Willo

Thanks for your comments!

I wasn't thinking I would need to increase the torque for the z axis as it is a screw drive and so should have plenty of torque. That being said I was going to use a nema 23 motor to keep all the motors the same which would add more torque anyways.

I don't believe the bend on the drag chain should be a problem as long as I pick a drag chain with the correct bend radius.

For example the below two drag chains are the same ID and OD but one has a radius of 38mm while the other has a radius of 18mm
http://www.ebay.com/itm/Cable-drag-chai ... 3a712c7cbb
http://www.ebay.com/itm/Cable-Drag-Chai ... 20ca8dcd44

The bend (overall top most point to bottom) should be the outside height plus the bend radius
Capture.PNG
Capture.PNG (18.04 KiB) Viewed 3165 times
My buildlog is here

loopingz
Posts: 107
Joined: Fri Jul 27, 2012 5:00 pm

Re: Custom ShapeOko Design

Post by loopingz » Tue Oct 02, 2012 8:41 am

So do you recommend high or low bend radius?
Shapeoko 1. Dual Y 1m with Name 17 (twice lower torque as the original motor). Double Xrails side to side. Acme-Z. Metalspacers.Wood 22mm waste board. Kress1050 with custom holder. Arduino GRBL + GRBL shield.

daveczrn
Posts: 42
Joined: Thu Jul 05, 2012 11:06 am

Re: Custom ShapeOko Design

Post by daveczrn » Tue Oct 02, 2012 9:36 am

the smaller radius will allow it to fit in smaller area, i would go with that one.

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