Nema23 on Z-Axis

discussion of design changes / improvements / suggestions
RobCee
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Location: Birmingham, UK

Nema23 on Z-Axis

Post by RobCee » Thu Feb 27, 2014 6:32 pm

I was playing around with ideas for mounting a Nema-23 motor on my Z-Axis but didn't want to have to push my spindle out any further than it already is.
I have yet to complete the actual work, but I believe that my design is sound, for using the existing mounting arrangement for a Nema-17 motor.

Existing Nema-17 Z-Axis mounting:
Nema17.jpg
Nema17
Nema17.jpg (57.03 KiB) Viewed 3482 times
Given that the standard (Nema-17) motor is rotated by 45 degrees in order to help it avoid the other mounting hardware, I looked at the dimensions of my Nema-23. If I can turn it through the same 45 degrees, so that it's back is parallel to the Z-Axis, then it can stay on the same axis of rotation and does not take up any more Y-Axis space (if that makes sense!).

Here is my idea for mounting the Nema-23 without having to rework the Z-Axis Rail assembly:
Nema23.jpg
Nema23
Nema23.jpg (54.92 KiB) Viewed 3482 times
The adapter plate is simple enough to make from a chunk of Aluminium, I had some 3mm plate hanging around and the stock spindle was good enough to cut it out with, if slow.
Nema Adapter.jpg
Adapter plate
Nema Adapter.jpg (43.95 KiB) Viewed 3482 times
It should work if I cut down the Brass Standoffs and then use some spacers to mount the Nema-23 at a suitable distance from the plate. I think that I should still be able to get my fingers into the coupler, so that I can move the axis manually too.
ShapeOko2 #3400 - Chinese 800W AC Spindle - Stiffened X-Axis - TR10 Z-Axis - Inverted Z Motor - Hall Effect Limits - Drag Chains & Custom Brackets

RobCee
Posts: 587
Joined: Wed Jan 08, 2014 11:33 am
Location: Birmingham, UK

Re: Nema23 on Z-Axis

Post by RobCee » Thu Feb 27, 2014 6:33 pm

Here is a shot of the milled mounting plate:
20 Adapter Plate.jpg
Adapter plate
20 Adapter Plate.jpg (200.95 KiB) Viewed 3481 times
ShapeOko2 #3400 - Chinese 800W AC Spindle - Stiffened X-Axis - TR10 Z-Axis - Inverted Z Motor - Hall Effect Limits - Drag Chains & Custom Brackets

samc99us
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Re: Nema23 on Z-Axis

Post by samc99us » Sun Mar 02, 2014 3:13 am

Rob I had the same thought, but lacked the time to generate a design. Would like to see your installed setup. Those are some clean cuts in aluminum, cut on the SO2?? If so, what spindle, end mill, feeds and speeds?
Modified Shapeoko 2: 1500mm fully supported y-axis, 1000 mm 4060 x-axis, ACME Belt Drive Z-axis, Dewalt DNP611, full aluminum t-slot table, 4x NEMA23 180 oz/in stepper motors driven by a G540

Improbable Construct
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Re: Nema23 on Z-Axis

Post by Improbable Construct » Sun Mar 02, 2014 4:22 am

Yes that will work. It is exactly what I did for the NEMA 23 mount kit avalible in the store.
You may want to use something stronger than the brass standoffs to handle the torque of the bigger motors.
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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RobCee
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Location: Birmingham, UK

Re: Nema23 on Z-Axis

Post by RobCee » Sun Mar 02, 2014 9:07 am

Thanks for the head's-up IC. It looks like I have to make some custom standoffs for it anyway, so I will make them a bit beefier than the brass ones.


RC - Tapatalk
ShapeOko2 #3400 - Chinese 800W AC Spindle - Stiffened X-Axis - TR10 Z-Axis - Inverted Z Motor - Hall Effect Limits - Drag Chains & Custom Brackets

RobCee
Posts: 587
Joined: Wed Jan 08, 2014 11:33 am
Location: Birmingham, UK

Re: Nema23 on Z-Axis

Post by RobCee » Sun Mar 02, 2014 11:15 am

Samc99us - Yes the plate was cut on my SO2, with a feed rate of 300mm/min and a 0.1mm depth of cut. I had switched from the generic spindle to my Dremel as I bust the collet lock on the generic one. I used a speed of around 15000 rpm and plenty of WD40 as lubricant. The thing that made the biggest difference to the finish was blasting all the chips out with air at regular intervals. I picked up a multi-pack of keyboard air cleaner and have been using that for a while when working with aluminium, it really helps. On the down side, it blasts small chips of aluminium and WD40 all over the place, so there is plenty of cleanup required afterwards...
ShapeOko2 #3400 - Chinese 800W AC Spindle - Stiffened X-Axis - TR10 Z-Axis - Inverted Z Motor - Hall Effect Limits - Drag Chains & Custom Brackets

WillAdams
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Re: Nema23 on Z-Axis

Post by WillAdams » Sun Mar 02, 2014 3:07 pm

Robcee,what alloy is that?
Shapeoko 3XL #0006 w/Makita RT0701 Router w/0.125″ and ¼″ Elaire precision collets
Nomad 883 Pro #596 (bamboo)

RobCee
Posts: 587
Joined: Wed Jan 08, 2014 11:33 am
Location: Birmingham, UK

Re: Nema23 on Z-Axis

Post by RobCee » Sun Mar 02, 2014 3:29 pm

It is 1050A, Will
ShapeOko2 #3400 - Chinese 800W AC Spindle - Stiffened X-Axis - TR10 Z-Axis - Inverted Z Motor - Hall Effect Limits - Drag Chains & Custom Brackets

RobCee
Posts: 587
Joined: Wed Jan 08, 2014 11:33 am
Location: Birmingham, UK

Re: Nema23 on Z-Axis

Post by RobCee » Tue Mar 04, 2014 7:24 pm

I finished making the spacers and mounted my Nema23 today.
21 Adapter In Situ.jpg
Adapter in situ
21 Adapter In Situ.jpg (225.03 KiB) Viewed 3315 times
The spacing works well, just as planned; it lets me drive my spindle up right past the whole thing.

I did have a tricky time with the spacers though; I got impatient and tried power tapping one of them and ended up braking off the tap inside it - DOH!

There was not quite as much length on my M8 rod as anticipated either, so I had to change the heights on the upper spacers a bit too, but it works.

It's all a slippery slope here though - changing the motor means switching to upgraded cables for connection as I had to put a connector on it's shorter wires. That means reworking the other motors too, as it makes sense. Having the Z plates off to mess about with the connections meant I replaced my spindle mounts for my upgraded spindle. Looking at the various elements flexing now with the additional weight I may have to consider some reinforcement - my spindle may be a tough too heavy!

It all keeps me quiet though...
ShapeOko2 #3400 - Chinese 800W AC Spindle - Stiffened X-Axis - TR10 Z-Axis - Inverted Z Motor - Hall Effect Limits - Drag Chains & Custom Brackets

aroldfut
Posts: 10
Joined: Thu Jan 30, 2014 3:04 pm

Re: Nema23 on Z-Axis

Post by aroldfut » Wed Mar 12, 2014 2:12 am

Your post and design has helped me decide the way to go with my Nema 23 Z-axis upgrade. In addition, I am adding a 1/2" 10tpi Acme screw. I already made a new Delrin block. Once it's attached and aligned to the Nema 23 I can move on to a solution for the clearance issue between the Makerslide and Z-Axis motor plate created by the thicker Acme screw. Again, well done!

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