On Friday, February 4, 2022 12:47:30 PM EST Kenneth Lerman wrote:
> I don't think I'm ready for yet another hobby (3-D printing), so I
> think I'll just put an oversized motor and pulley.
>
> Gene -- What stepper family are you using for the lathe? (A link,
> please.)
>
> Regards,
>
> Ken
The stepper motor and its drive are a combo that work together, itsd a 3
phase motor that step only 1.2 degrees for a full step. The motor
contains an an encoder that is only connected to the driver, not to
LinuxCNC, so the driver knows the motors position error, which it uses to
both keep the motor in step, and also track how hard it is working, which
if the motor hit the immovable object, will in about 3 steps
, issue an alarm that you can use in you .hal file as an e-stop, which in
my configs, also disables ALL machine power, and even reporting which
axis faulted. That of course loses home. That's the programmers fault of
course, so fix your program, hit f2 to re-enable the machine power, pull
the tool holder off the post, rehome the machine, replace the tool
holder, and restart the program. The driver also uses the error to
control motor current. so the motor runs a bunch cooler in normal
operation too.
ebay thinks they are being cute a 2 kilobyte links, but here's the first
3nm kit I could find, 2nm and 1nm using the same driver is even less per
axis,
<https://www.ebay.com/itm/264256757870?
_trkparms=ispr%3D1&hash=item3d86ee206e:g:
2kAAAOSwIN9cmwHm&amdata=enc%3AAQAGAAACoPYe5NmHp%252B2JMhMi7yxGiTJkPrKr5t53CooMSQt2orsStdebXPz4ZTXCT8FI9kPBh6Qv0F7vAZnLUzT7lupINpqMV%252Bi8qLGKnFk43H3pNDtZ2YEKZd6UnbTIgnhfuK3Xj7KlfEu5WlT5Zx4uK2f88856h4dWwg6D%252BC7TlHtaFvYKne3L7vcJtYYZ%252FAklycULyHTxUhq9zcqctaC4sgdCJi8NPOYePTQvbVKoEqcMOe1IDqUp1Mh8ClOPz77NMwzIRSKqZ2vG5kvHYtmHRh%252F6p5So4i9pZqYE%252FIUBpwYrs8rA0UMRprLx6uPyXbB3q28Ji5Lcs3cHTVm7Ab03W0qBJrhyaxXW%252Ffi%252B6nHnI73B0%252BNnWMXmn5d8Yx34p03cQg6KSfU57rcUHN5ZMxNVZCrguFczFDAeJkMHT7zmu7nqprmvsgzTm3Z24G89bQlygi8CoFid2eb%252BtxNus4Og4cInyVKAmUsdV3Ug%252BVv95CBy2onILY1bONJ%252FA%252Fmo%252BeRPUxbOmz8V3Eom409FJC%252FCaYo31jXi7ovaNnlM2k10sd98BcQsqcv7GkN6e6i2QRMY8uDEf4wBOdriGopp391Y0ioXdeyJysJwqlyYBUE8sK%252F4zHmnp%252FC2Y0wVcwWcbH5xcxQlSeKtQjNBU6QqyYzOZODKSjJLvtI9oZFPTVFGTFwPb87OThnwCvVRN%252FQkpRH4JuS6iH2pu90Z09IAljYduNAHXPslqVX1Q0JEmuWB8J%252FaVQrKqv870El511lZ%252BS3OsBRFgu1yAd0QgLvsMecdX8BTRZwfBMqylKL933BcjXV2%252BIVNjzbe02gMQYdzB2V2%252FhB8aDDxDWj4SH98qdRHy3ntgY98xSMe2xAKFJx%252BGG328A6wTJ9HAzIHrBMxrIy6jzGkhA%253D%253D%7Cclp%3A2334524%7Ctkp%3ABFBMvtbU4thf>
Which may or may not work, search for "3 phase stepper servo"
They are now available clear up to nema 52, so the motor makers are
getting right with it these days, a month back the link above to 3NM plus
1 and 2's too, was all that was available.
Big motors still take your house payment though. But these are nice, and
the 3nm should be big enough. Scan down the search results till you see a
gold controller as part of the kit. Perhaps the blue one is ok, but I've
no experience with that puppy.
You'll need a 42 volt psu for these, about $75 for one big enough to run
both motors as these, at full song, need 3.5 amps/phase throttling down
to an amp or less at light loads. The 15 amp version s/b enough, with a
bit of headroom leftover.
Take care and stay well.
Cheers, Gene Heskett.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/gene>
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