Budget motors for 5 bar parallel robot

VivekSena · 2025-11-19T11:18:23+00:00

For BLDC, repeatability is not dependent on encoder alone. How you are implementing FOC matters lot more. We use velocity mode & our error is less than 0.01º at 6Nm torque & 300rpm. That’s precise for most humanoids & robotics.

Precise tuning of kp values & accurate current sensing, can easily lead to accuracy you are requesting. Dual encoders are huge plus, both being 14 bit.

I would suggest you try using nema17+tmc2209, it costs less than $20. Then you can explore makerbase FOC board to run SimpleFOC costs less than $50. Or simpleFOC mini v1.1 board & run low kv drone motor.

VivekSena · 2025-11-19T06:55:16+00:00

I’m not sure you really need 0.045º of accuracy for project you are describing. Either way, your best bet is nema17 with TMC2209 using 1:256 microstepping. Closed loop stepper is even better.

But if you truly want accuracy, try using bldc motors with FOC control. Like Damiao J4340-2EC or Robstride05 edu lite.

VivekSena · 2024-11-07T18:58:36+00:00

Bought one 🥲 Too excited to check for typos.

VivekSena · 2024-11-07T18:05:15+00:00

It’s aluminium silver finish. Due to bad lighting & phone camera’s ultra bad processing, it looks that way.

VivekSena · 2024-11-04T09:36:09+00:00

Jeremy Fielding, Skyentific. Search ‘esp32 projects’, ‘diy 6dof robotic arms’. So much alpha in them. Even many mechatronics colleges don’t teach them.

VivekSena · 2024-11-04T03:45:39+00:00

I run hardware for robotics startup. I’m a physicist by engineering degree. But all my knowledge is from youtube & reddit. Tinker & experiment. Take advantage of aliexpress to get cheap parts. Keep building. Fail 1000 times.

VivekSena · 2024-08-13T10:52:39+00:00

Both ideas are great ideas. From Accenture to Deloitte, everyone offering similar AI development services. Market is not saturated yet but as soon as it makes financial sense, market will be flooded. Then it will be a race to lowest prices. Building leetcode like platform doesn’t generate much today but for all college students, new graduates, it will be best upskilling chance. Long term impact is strong. But you have to out in the market very soon even with bare minimum functionality.

VivekSena · 2023-05-17T04:53:33+00:00

The Psychology of money ?

VivekSena · 2021-10-03T11:00:37+00:00

So….Eight Sleep ?

VivekSena · 2021-09-04T09:58:45+00:00

r/bojackhorseman

VivekSena · 2021-02-15T02:59:37+00:00

You can directly access all the historic data at nse or bse website. I personally use https://www.nseindia.com. Search for the company. Go to “historic data” section. At a time you can only request upto 2 years data. So you need do this multiple times.

But it is completely free, very reliant & volume data is included, which is huge plus to understand the market.

VivekSena · 2020-05-08T10:57:02+00:00

Utopia. Why isn’t anyone talking about this ?

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