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Motors for Makers: A Guide to Steppers, Servos, and Other Electrical Machines (2015)

motorsformakers.com

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Re: Motors for Makers: A Guide to Steppers, Servos, and Other Electrical Machines (2015)

#81

Post by dsfyu404ed »

abakker wrote: post #46
doctorwho42 wrote: post #44

Earlier quoted context omitted.

It really comes down to the fact that gear shaping/cutting machines are quite specialized machines. Therefore demand a higher cost to buy (machines cost) and setup (tooling cost). For example a single gear shaper cutter is on average $700-$1000, and that's for a pretty standard and brand new cutter. So without taking into account actual time to set up the machine, program it, and feed it material. You are already hav…

standard gear cutting arbors aren't that expensive, but are often for standard module gears and the gear form is an approximation that applies to a given range of gears. e.g. https://www.amazon.com/EVNSIX-Involute-Cutters-Milling-Machi...

The "frequently bought together" set there is a surprisingly good combo for an algorithmic pick.

Re: Motors for Makers: A Guide to Steppers, Servos, and Other Electrical Machines (2015)

#82

Post by dsfyu404ed »

cpach wrote: post #23
mbustamanter wrote: post #10

Earlier quoted context omitted.

My trick was searching +"index of" on Google or something like that, I could find all sorts of books that way. What were your tricks?

filetype:pdf These days, Libgen is much more convenient. With that said, I personally prefer buying an official book if available, so that the author can get their royalties. Many publishers even offer DRM-free ebooks.

When I can't find a pdf I like buying old editions on eBay for $10 or whatever. I find that having to browse through more info to actually find what I'm trying to reference leads to better ancillary knowledge and understanding than CTRL+Fing a pdf.

Re: Motors for Makers: A Guide to Steppers, Servos, and Other Electrical Machines (2015)

#83

Post by [deleted] »

marcosdumay wrote: post #78
GeorgeTirebiter wrote: post #59

Earlier quoted context omitted.

This was PRECISELY the problem that led me to get a 3D printer. I have successfully printed many gears using PETG for my projects. Now, they are physically bigger than metal gears for the same strength, but that hasn't been an issue in my applications. Using the wishbone-style gear teeth with 3D printing is remarkably sturdy. Of course the other way is: buy motors with (metal) gears that are close to your need - then…

> Of course the other way is: buy motors with (metal) gears that are close to your need - then you only need to 'transform' that motion a little bit. Buy overpowered motors close to your need, and 'transform' them by software.

[deleted]

Re: Motors for Makers: A Guide to Steppers, Servos, and Other Electrical Machines (2015)

#84

Post by schaefer »

TheRealWatson wrote: post #9

Another good resource is Jeremy Fielding's YT channel.

I agree, I had a custom controller board for a pair of huge electric motors go bad. I was able to bring the machine back to life using only what I learned form Jeremy Fielding's channel.

Re: Motors for Makers: A Guide to Steppers, Servos, and Other Electrical Machines (2015)

#85

Post by atonse »

Wow this is AMAZING!

There are a whole set of projects I’ve just not tinkered with because of my lack of knowledge about motors.

For example, I want to make my bicycle hook system run on a motor. But winches are too strong. Don’t need something to pull 1500 lbs. just 100 lbs.

All I know is that it should probably be low rpm and higher torque.

Another is to play with something like curtain opening motors but as long as they are as quiet as possible.

Hope this resource helps with the first principles understanding of how to pick motors, etc.

Re: Motors for Makers: A Guide to Steppers, Servos, and Other Electrical Machines (2015)

#86

Post by _spduchamp »

dekhn wrote: post #37
_spduchamp wrote: post #33

If you are looking for a super easy way to put a motor with closed loop motion control, I highly recommend Vertiq ( https://www.vertiq.co/ ) modules. They have a built-in position sensor and microcontroller. They have firmware based anti-cogging for smooth motion. I use them in making computer controlled musical instruments by just hooking up the serial interface to an ESP32 and using the Vertiq API to handle all the…

Do you know if this would be appropriate in, for example, a microscope stage? I use steppers (open loop) to move a stage on bearings, and I would prefer to have closed-loop with position sensing (not movement- actual position- because a single dropped step will ruin an acquisition). I already work with ESP32 and have done closed-loop DC motor stuff before, so I'm just curious if this is something I could drop in and…

I primarily use the Vertiq line because I'm dealing with speed of spinning a rotary magnetic bow, and timing a robotic drumming. I don't think Veriq is the right fit for a microscope stage.

They have a new line of closed loop steppers that would be better suited for that type of motion control. https://www.crowdsupply.com/iq-motion-control/iq-fortiq-bls4... These should provide very smooth and precise position control. These units haven't shipped yet but will be soon.

Re: Motors for Makers: A Guide to Steppers, Servos, and Other Electrical Machines (2015)

#87

Post by convolvatron »

iancmceachern wrote: post #40
FatActor wrote: post #38

One problem I always run into with rotary motion: gearing. Finding gears of the right diameter, thickness, and thread pitch is always such a stumbling block for me. Most sites that sell gears to fit their motors have a small selection, and sites that sell gears are very hard to navigate (only to find out they don't sell in quantities <1,000 units). I end up having them laser cut out of HDPE online. Wish there was an…

The key, if you can, is to choose a NEMA standard motor, there are tons of suppliers you can get a nema gearbox from. They get pretty small, but if it's amaller than the smallest nema size I'd go to a place like stock drive components which stocks thousands of gears. The challenge is that gear tooth geometry is often more than 2d, so laser cutting may not be the best solution for longevity. For a quick and dirty prot…

standalone gear boxes also seem to be really really expensive

what i would really love is a set of compatible gears that work from the same shank and would allow easy construction of 1:2 or 1:4 or 1:8 and i could compose. maybe some 1:1 bevels too

Re: Motors for Makers: A Guide to Steppers, Servos, and Other Electrical Machines (2015)

#88

Post by fatneckbeard »

pitched wrote: post #5

The second Google result for this book is a chapter preview from the publisher: https://ptgmedia.pearsoncmg.com/images/9780134032832/samplep... The first result is entire PDF though. I remember back in the old days being a poor student trying to save money spending hours trying to find scans of texts (or making scans in the library). Now it’s the first result in Google! Here’s hoping none of us need to make money thr…

its funny how huge chunks of the upper class white collar work force spent their entire youth stealing thousands upon thousands of dollars of stuff with zero punishment.

Re: Motors for Makers: A Guide to Steppers, Servos, and Other Electrical Machines (2015)

#89

Post by airbreather »

doctorwho42 wrote: post #44
FatActor wrote: post #38

One problem I always run into with rotary motion: gearing. Finding gears of the right diameter, thickness, and thread pitch is always such a stumbling block for me. Most sites that sell gears to fit their motors have a small selection, and sites that sell gears are very hard to navigate (only to find out they don't sell in quantities <1,000 units). I end up having them laser cut out of HDPE online. Wish there was an…

It really comes down to the fact that gear shaping/cutting machines are quite specialized machines. Therefore demand a higher cost to buy (machines cost) and setup (tooling cost). For example a single gear shaper cutter is on average $700-$1000, and that's for a pretty standard and brand new cutter. So without taking into account actual time to set up the machine, program it, and feed it material. You are already hav…

aliexpress is a goldmine, example of some small stuff with metal gears, very good manufacturing tolerances

https://www.aliexpress.com/item/1005004936458606.html

https://www.aliexpress.com/item/1005004830455177.html

https://www.aliexpress.com/item/4001110546573.html

Re: Motors for Makers: A Guide to Steppers, Servos, and Other Electrical Machines (2015)

#90

Post by conductr »

airbreather wrote: post #89
doctorwho42 wrote: post #44

Earlier quoted context omitted.

It really comes down to the fact that gear shaping/cutting machines are quite specialized machines. Therefore demand a higher cost to buy (machines cost) and setup (tooling cost). For example a single gear shaper cutter is on average $700-$1000, and that's for a pretty standard and brand new cutter. So without taking into account actual time to set up the machine, program it, and feed it material. You are already hav…

aliexpress is a goldmine, example of some small stuff with metal gears, very good manufacturing tolerances https://www.aliexpress.com/item/1005004936458606.html https://www.aliexpress.com/item/1005004830455177.html https://www.aliexpress.com/item/4001110546573.html

As FYI, on many of these you can get on Amazon/Ebay. You'll pay a buck or two extra but get it the next day.
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