Using the big DIY concrete CNC machine in ways we couldn't have foreseen!

The other part of this CNC video here:    • Learning to use an industrial-DIY CNC  
To see how this CNC is made watch this:    • Can we DIY an Industrial grade CNC?  

The spindle motor in the video is a 240V single-phase Jianken JGL-100mm 3.2kw 24000rpm BT30 ATC. It has ceramic bearings and thus far seems very very nice. We chose a 4 pole one, which has somewhat more torque at lower rpm than the 2 pole, but requires at least an 800Hz VFD. You can find the spindles here: https://jianken.en.alibaba.com/ and if you do buy from them, message them and mention 'Flowering Elbow' to get yourself a discount!

For more videos on the CNC check out this playlist:    • Bigger castings, melting and making a...  

APOLOGY relating to the grinding wheel: I'm super grateful to Baltic Abrasives, who were kind enough to supply me with this cubic boron nitride (CBN - which is NOT Diamond) grinding wheel free and no strings attached. The fault for specifying an inappropriate wheel or the job is all mine (arguably a grinding wheel has no place on a CNC router like this). Originally I was going to use it on the mini mill, so for the CNC the wheel was too large in diameter, not course enough, and should have had coolant to run properly.
When surfacing the mag vice, I now know it is common practice to first cut back the non-magnetic material (usually lead I believe) below the steel surface. This stops the soft lead from clogging whatever kind of grinding wheel is being used.

Many comments suggest using an aluminum oxide wheel, assuming we used a diamond wheel - we didn't! For hardened materials, like thicknesser knives made of high speed steel (but not so hard as carbide), a CBN wheel is a great choice. Compared to aluminum oxide it creates less abrasive dust, cuts cooler (less risk of thermal damage to the knife edge) and faster, and requires less re-dressing. It isn't so good if you clog it with super soft material like lead - my bad!

If you have an interest in CBN grinding, Baltic abrasives should give you a discount if you mention 'FloweringElbow' - they offer any type of diamond or CBN wheel (resin phenol bond, polyimide bond, hybrid bond, electroplated, vitrified, sintered or metal bonded). The bodies of wheels can be made of aluminum, aluminum powder, aluminum and bakelite, steel, and copper. There is no minimum order quantity and they do one-offs, standard or bespoke wheels. They ship worldwide from Lithuania, Europe. If you're interested, get in touch with Darius at: [email protected]
and check out their e-shop www.lapidarywheels.com www.baltic-abrasives.com

The spindle motor in the video is a 240V single-phase Jianken JGL-100mm 3.2kw 24000rpm BT30 ATC. It has ceramic bearings and thus far seems very very nice. We chose a 4 pole one, which has somewhat more torque at lower rpm than the 2 pole, but requires at least an 800Hz VFD. You can find the spindles here: https://jianken.en.alibaba.com/ and if you do buy from them, message them and mention 'Flowering Elbow' to get yourself a discount!

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