This is a real quick upgrade for the OpenBuilds Mini Mill, to offset the Z Axis motor behind the machine:
Pros:
- Lower overall machine height (In my case, this was my main driving factor: Wanted to fit the mill in existing shelf space)
- Lower center of gravity - less vibrations
- Easier to reach Z axis to manually turn (versus reaching inbetween motor and CBeam in the conventional setup) for manually adjusting Z Zero
- Future: Reduction Drive (Pulley ratios) for even more torque
Cons:
- More parts (; - no biggie
(This assumes you have a stock OpenBuilds MiniMill kit)
1: Order some additional parts:
1 x NEMA 23 Reduction / Stand Off Plate
1 x 3GT (GT2-3M) Timing Pulley - 20 Tooth - 9mm Belt - .25" Bore
1 x 3GT (GT2-3M) Timing Pulley - 20 Tooth - 9mm Belt - 8mm Clamp Bore
1 x 3GT (GT2-3M) 9mm Timing Belt - Closed Loop
4 x M5 nuts to attach the motor (thanks @bobt for pointing out these are missing from the previous version of this list)
2: Remove the existing Z Axis Motor and spacers
3: Remove the top C Beam End mounting screws
4: Install the Stand Off Plate and reattach the motor to the plate
5: Install the Belt and Pulleys
How to: Here's a video!
MiniMill Z Axis Upgrade with Offset Motor
Build in 'X/Y Table Style CNC Mill' published by Peter Van Der Walt, Sep 13, 2017.
Upgrade your Minimill with an off-set Z Axis Motor
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- Build Progress:
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- Build Complete!
Attached Files:
Tomas Pontes, Forestbird Originals, Megamau and 10 others like this. -
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Build Author Peter Van Der Walt, Find all builds by Peter Van Der Walt
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Build Details
- Build License:
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- GNU (GPL3+) General Public Licence
Inspired by