ACME screw upgrade for Shapeoko Z-Axis

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Todd Bailey
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Re: ACME screw upgrade for Shapeoko Z-Axis

Post by Todd Bailey » Thu Oct 04, 2012 12:51 pm

Wow...

This looks great!!!! I read the Wiki and seeing as I am using out of box setup how would I go about changing the controller software for this upgrade?

Thanks... this is on my wish list!
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Todd Bailey and ShapeOko - 413
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loopingz
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Re: ACME screw upgrade for Shapeoko Z-Axis

Post by loopingz » Thu Oct 04, 2012 1:22 pm

Calculate your new steps per millimeter

To calculate steps per inch you need to know:

Steps per revolution of your motors (normally 200 or 400)
Microstepping of your controller: 1, 2, 4, 8, or 16
Thread pitch: The ACME screw is TPI = 12 or pitch = 2.117

So it is: Steps * Microsteps / Pitch = Steps per mm
Ex: 200 * 2 / 2.117 = 188.946623
Finish

Enter your new steps per mm into your control software.
If you are using grbl then $2=188.947 and you are good to go...
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.

Todd Bailey
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Re: ACME screw upgrade for Shapeoko Z-Axis

Post by Todd Bailey » Thu Oct 04, 2012 1:50 pm

Perfect!!!!

Thanks!
--------------------------------------------
Todd Bailey and ShapeOko - 413
Owner and Creative Designer
4m3D Creative Design
http://www.4m3d.com
Skype Call - todd.4m3d
Phone - 443-450-4633

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Improbable Construct
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Re: ACME screw upgrade for Shapeoko Z-Axis

Post by Improbable Construct » Thu Oct 04, 2012 3:45 pm

Loopingz,

I updated the Wiki page with the grbl settings.

Thanks for the info.
Shapeoko #Classified some of the bolts may be original parts.
Shapeoko 1 # ???? Stainless plates, still in the box.
Shapeoko 2 # 3926 not stock
Shapeoko 3 # 0003
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PsyKo
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Re: ACME screw upgrade for Shapeoko Z-Axis

Post by PsyKo » Fri Oct 05, 2012 2:28 pm

Just out of curiosity, what is the kind of lpastic used for the 2 plastic mounts ?

Thanks. It looks like an amzing mod. Probably reduces Z noise a lot.
Shapeoko #736
Kress 800, Z Axis upgrade, dual Y, 600mm X&Y rails, metal spacers and V Wheels, home switches, 4th axis
Goko - Free CNC Control Software - http://www.shapeoko.com/forum/viewtopic ... 380#p44380

Improbable Construct
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Re: ACME screw upgrade for Shapeoko Z-Axis

Post by Improbable Construct » Fri Oct 05, 2012 3:29 pm

PsyKo wrote:Just out of curiosity, what is the kind of lpastic used for the 2 plastic mounts ?
.

The prototypes were HDPE.
The production version is UHMW.
Both plastics work well and are easy to machine.
Shapeoko #Classified some of the bolts may be original parts.
Shapeoko 1 # ???? Stainless plates, still in the box.
Shapeoko 2 # 3926 not stock
Shapeoko 3 # 0003
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CptanPanic
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Re: ACME screw upgrade for Shapeoko Z-Axis

Post by CptanPanic » Tue Oct 09, 2012 12:45 pm

I wonder if you included a second delrin nut so that you can attach to top and bottom of z plate, then this would give a lot more axial support for the z axis. It would also in effect strengthen the z axis plate. What do you think?

Improbable Construct
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Re: ACME screw upgrade for Shapeoko Z-Axis

Post by Improbable Construct » Tue Oct 09, 2012 3:10 pm

I will give it a try but my guess is that it will be almost impossible to match up the threads.
I guess if one of the nuts had slots in it, it could be adjusted up or down to match the threads and act as a poor mans anti-backlash nut.
I have been running jobs with the ACME mod for a couple of months and haven't had any problems with backlash.
Shapeoko #Classified some of the bolts may be original parts.
Shapeoko 1 # ???? Stainless plates, still in the box.
Shapeoko 2 # 3926 not stock
Shapeoko 3 # 0003
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http://ImprobableConstruct.com
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https://twitter.com/ImprblConstruct

edwardrford
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Re: ACME screw upgrade for Shapeoko Z-Axis

Post by edwardrford » Tue Oct 09, 2012 3:32 pm

Good thinking guys! If one set of holes were slotted (or had some play) you could put a spring between the bottom delrin nut and the top (sloppy) nut, that would give you a "true" anti-backlash solution as they would always be pushing against the threads.

-Edward
Shapeoko 1 #0 - a couple of upgrades.
Shapeoko 2 #0 - a couple of upgrades.
Shapeoko 3 #2 - Stock

CptanPanic
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Re: ACME screw upgrade for Shapeoko Z-Axis

Post by CptanPanic » Tue Oct 09, 2012 5:16 pm

edwardrford wrote:Good thinking guys! If one set of holes were slotted (or had some play) you could put a spring between the bottom delrin nut and the top (sloppy) nut, that would give you a "true" anti-backlash solution as they would always be pushing against the threads.

-Edward
Yes, good thinking.

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