DIY Mini-CNC with DRV8811 drivers and EMC2 - Testing new head assembly

Well, eccentric inserts didn't work so well as the slop ion the bearings were the major culprit. Going back to the classics I did a new head assy with alu angles and twice the number of bearings in a 90 degrees setup.
This is the Z and X axis. The leadscrews will be on the sides in plane with the axis but in such a way as to not interfere with actual travel.
The assembly weighs in at a whopping 2.8 kg. Maby not surprising since it's mostly MDF.
Stiffness/rigidity seems very good and I can't see any noticable deflection.
I'll have to fasten the x-axis before I can really see though. Trying to bend the z when at it's maximum should give an idea.

Category:

Science & Technology

Tags:

• diy
• cnc
• angle
• alu
• profiles
• 608
• bearings
• skate
• bearing

[bassman2914]

Looks well built but if i read your description right you started with eccentric bearings. If setup right those would've been a better choice allowing adjustable preload and higher accuracy although neither of those are important if you're building with mdf. As far as weight/ rigidity goes, my gantry weighs 50lbs without the spindle and is about the same size. You can imagine the rigidity involved.(it's all aluminum)

[1kreature]

@bassman2914 The eccentric inserts still allowed the bearings to wobble (axial load). With two bearings at 90 deg angle this won't happen so for cheap setup it is a better choice.

[karandex]

do you have your website?

[1kreature]

@karandex No website, Bo blog.

[glanz989]

nice :D