ACME screw upgrade for Shapeoko Z-Axis

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daveczrn
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Re: ACME screw upgrade for Shapeoko Z-Axis

Post by daveczrn » Thu Nov 08, 2012 8:12 pm

You also want the screw to last longer so making it out of aluminum or plastic would not be beneficial here. And machining accuracy would also be effected by making it out of those other materials because of deflection.

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

Post by Improbable Construct » Thu Nov 08, 2012 9:30 pm

Daki wrote:My first post ... a question for IC
Just looking for some clarification on the wiki page about the z-axis ACME upgrade.
In the description sentence it states:
"Description: An upgrade that replaces the M8 threaded rod with a 3/8"-10 Acme Screw."
In the first bullet point of the Benefits it references 12 TPI(ACME) and in the Materials section is lists "1x 3/8-12 Acme screw".
Which one does the kit come with the 10 or the 12?

Also wondering what the general thoughts would be on getting an ACME screw made from aluminum or nylon even? It would be lighter and hence less mass cantilevered off the gantry rail. Wondering what kind of wear guys are seeing on the screw?
D
Daki,

It is a 3/8"-12 ACME screw.
That was a typo in the Description section of the Wiki.
I fixed it now.
Sorry about the confusion.

As far as the weight goes, the ACME screw weighs in at 3.4 oz and the whole kit only weighs 6.8 oz.
To put that in perspective, 200 mm of makerslide weighs 6.4 oz.
I agree with cvoinescu and daveczrn, the strength of the steel outwieghs any weight savings from other materials.

On the wear topic I have seen no wear on the screw and the delrin nut feels the same as the day I made it.
I am not sure how much other people use their machines but with my dust collector I filled a 5 gallon bucket with plastic and wood swarf since installing my ACME screw and it still works perfect.
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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Daki
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Joined: Sat Oct 27, 2012 2:55 am

Re: ACME screw upgrade for Shapeoko Z-Axis

Post by Daki » Thu Nov 08, 2012 10:49 pm

Awesome thanks for the feedback guys! I was thinking along the same lines but just wanted to throw it out there
I love this forum (been on here for a while, reading and learning as much as I can).
I have access to a machine shop so I think I may take the plunge soon and put together my own shapeoko.
I am a bit stumped tho on how to make my own delrin nut, any insight on that?

Or is the nut available for purchase some where by itself. I can source the ACME rod, bearings, and bolts and make the two end plates for the z-axis

Thanks again
D
Shapeoko #1895 ... to be assembled!

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

Post by Improbable Construct » Thu Nov 08, 2012 11:21 pm

I have some extra ACME Delrin nuts.
I can sell them on their own if you need one.
Price is $13.00 and includes shipping to the USA, International shipping is $3.00 extra.
PM me for more 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
Store:
http://ImprobableConstruct.com
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Daki
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Re: ACME screw upgrade for Shapeoko Z-Axis

Post by Daki » Fri Nov 09, 2012 2:08 am

Interested for sure. No idea how to PM you. Will look into it.
I'm up in Canada.

Will buy one or two, but still interested in how to make one.

Thanks
D
Shapeoko #1895 ... to be assembled!

cvoinescu
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Re: ACME screw upgrade for Shapeoko Z-Axis

Post by cvoinescu » Fri Nov 09, 2012 4:52 pm

Daki, if you want to make a nut yourself, it's not difficult. I bought a small piece of acetal (Delrin) that's nominally 12mm thick, but it turned out to be 13.2mm, so perfect for making ShapeOko lead nuts out of it. It's easy to cut; I used the same saw I use for MakerSlide (a 216mm diameter 80-tooth TCT blade made mainly for cross-cutting wood that's also suitable for aluminum) to cut a strip 20mm wide, and then a hacksaw to get 37mm of that. If you have a drill press, it should be a piece of cake to drill three holes in it with reasonable accuracy. ACME taps are expensive, but they work the same as regular taps, and acetal is a breeze to tap. I've read about people machining bits of ACME screw into taps for plastic very successfully. (I haven't done that, I tapped mine M8 with a store-bought tap, because that's what I needed at the time.)
Proud owner of ShapeOko #709, eShapeOko #0, and of store.amberspyglass.co.uk

deejayspinz
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Re: ACME screw upgrade for Shapeoko Z-Axis

Post by deejayspinz » Fri Dec 14, 2012 5:53 pm

I just wanted to send a public thanks to IC for working with me to resolve an issue I had with a bent ACME screw I rec'd with the upgrade. He went above and beyond for customer service by not only sending me the replacement, but also sending another as the item had appeared to have gotten lost in the mail. No questions asked. The quality of the parts are excellent and I look forward to using the upgrade once my machine is up-and-running. I recommend doing business with IC. Thanks IC!

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

Post by Improbable Construct » Fri Dec 14, 2012 7:41 pm

Deejayspinz,

Thank you for your patience.
I am sorry you got a bent screw in the first place, but I am glad that the replacement finally got to you in good condition.
Let me know if you need any help with installation or controller settings

P.S. I have five four three two kits left in stock. They normally ship same day.
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
Store:
http://ImprobableConstruct.com
Twitter:
https://twitter.com/ImprblConstruct

Jimmy0x52
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Joined: Mon Dec 17, 2012 5:20 am

Re: ACME screw upgrade for Shapeoko Z-Axis

Post by Jimmy0x52 » Mon Dec 17, 2012 10:27 pm

Could you use a 3/8-10 ACME screw for this instead of a 3/8-12? Was the specific reason for timing or what-have-you that this size was chosen?

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

Post by Improbable Construct » Tue Dec 18, 2012 12:14 am

Jimmy0x52 wrote:Could you use a 3/8-10 ACME screw for this instead of a 3/8-12? Was the specific reason for timing or what-have-you that this size was chosen?
Sure you can use 3/8-10. I used the 3/8-12 because that is what I had when I was prototyping.
You would just have to change the steps per settings to account for the 10 TPI
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
Store:
http://ImprobableConstruct.com
Twitter:
https://twitter.com/ImprblConstruct

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