Aleksandr Dobkin

[Aleksandr Dobkin @a_dob]

Meet A-750, my new 6-DoF robotic arm built from the ground up:

☑️ 750 mm reach 🤛
☑️ 1.5 kg payload 🏋️‍♂️
☑️ 1 kHz on-board control. Great for teleop 🤌
☑️ 0 external wires 👑

Available now exclusively in the SF Bay Area
💰 $2,000 for the first 5 units
📩 DM to order or learn more

[Aleksandr Dobkin @a_dob]

https://t.co/dRRKM1WW89
https://t.co/IM7wzfhn9E

[Aleksandr Dobkin @a_dob]

My PR adding ZAA to OrcaSlicer has just been merged into main!

Z Anti-Aliasing (ZAA) eliminates visible stair-stepping on sloped surfaces by micro-adjusting layer height to follow the actual surface geometry. The result is visibly smoother domes, chamfers, and shallow slopes

[Aleksandr Dobkin @a_dob]

Pictured here is my A-750 robotic arm at @circuitlaunch Oakland — a hardware-focused workspace and community.

Spaces like this make it easy for hardware builders to meet each other, share ideas, and prototype things quickly.

[Aleksandr Dobkin @a_dob]

https://t.co/vMwwcAGEDF

[Aleksandr Dobkin @a_dob]

The XHORSE is much anticipated five axis desktop CNC mill.

It's been in development so long many have assumed it was vaporware / would never reach the market.

But now the first long form review is out! And the verdict? It's decent

[Aleksandr Dobkin @a_dob]

@cwkdotone No website (yet). Follow me for updates

[Aleksandr Dobkin @a_dob]

Re-introducing the A-750, a capable but inexpensive robotic arm.

In response to user feedback, the A-750 will now come with an integrated gripper and camera.

Reach extended to 879mm with gripper

[Aleksandr Dobkin @a_dob]

@__morse Cost is $2,000. I'm making a small number of units available in SF Bay Area and LA for now. Will be available more broadly later. DM for details.

[Aleksandr Dobkin @a_dob]

@PrimeErwin Gripper can carry 0.5+ kg continuously. More testing needed to quantify repeatability, etc

[Aleksandr Dobkin @a_dob]

@yangWao Testing is showing gripper can hold 0.5 kg at steady state and arm can handle 1.5 kg at wrist. I'll be looking at changes to bump up gripper payload

[Aleksandr Dobkin @a_dob]

@chris_j_paxton I'm making a small number available, just in the SF Bay Area and LA for now. Will open more broadly once this gets thorough testing. DM me for details

[Aleksandr Dobkin @a_dob]

@wolfejosh This Vevor might do the job just fine, but it's not NSF certified. NSF certified equipment is required for most commercial kitchens. This is kind of a big thing to leave out of the discussion

[Aleksandr Dobkin @a_dob]

@qwertymodo @JasonPremoMFG @MakeAugusta Of course you have to use equipment that is rated to handle the load. But in the first picture, it looks like the plug melted at the connection. But in the second, it's a Tripp-Lite Super7 and it looks like conductors inside failed or were undesized. Weird

[Aleksandr Dobkin @a_dob]

@JasonPremoMFG @qwertymodo @MakeAugusta I don't think overload protection matters here. The circuit breaker or fuse on main panel will do the job.

I think the problem is dirt or debris on prong or receptacle contacts causing heating. There should be a temp sensor or something in receptacle to mitigate this

[Aleksandr Dobkin @a_dob]

@pDuU5a1iIF86611 @sekai_no_83 You could buy headphones like Sony MDR7056 and replace the ear pads. I have used the same pair of Brainwavz sheepskin ear pads since 2018 with the leather showing no sign of degradation, though the interior polyurethane lining peeled off

[Aleksandr Dobkin @a_dob]

Order / interest form: https://t.co/cZ2q4YdH10

[Aleksandr Dobkin @a_dob]

Meet A-750, my new 6-DoF robotic arm built from the ground up:

☑️ 750 mm reach 🤛
☑️ 1.5 kg payload 🏋️‍♂️
☑️ 1 kHz on-board control. Great for teleop 🤌
☑️ 0 external wires 👑

Available now exclusively in the SF Bay Area
💰 $2,000 for the first 5 units
📩 DM to order or learn more

[Aleksandr Dobkin @a_dob]

This is a visualization of the inertia of a robotic link

The gray blob is a visual aid. If it were made of solid aluminum it would have the same inertia as the link.

Inertias and masses for 3D printed parts are calculated from gcode toolpaths and from models for solid parts

[Aleksandr Dobkin @a_dob]

@jimbelosic Most factories through the 1800s were powered by water power. That's probably a big reason

[Aleksandr Dobkin @a_dob]

Check it out at https://t.co/yefABwxhSE

[Aleksandr Dobkin @a_dob]

I've implemented a form of non-planar slicing in the BambuLab Studio slicer. The basic idea is to vary extrusion height dynamically within a single layer.

This let's you print more accurate parts with better surface quality and less stair-stepping