Is this a really good stepper?

[Gary]

I doubt that motor will give half the holding torque while running at 1500 RPM, and saying max speed is 3000 RPM, is very misleading.
Torque curves are available, and all you need to do is ask.
We don’t put the curves on the site, because it causes confusion.
A torque curve is very specific to the actual driver, actual Voltage and resolution, and will vary greatly with different drivers, voltage and resolution.
The comment about the Chinese are not good at detent torque and the French are better, is laughable when you consider that 99% of stepper motors are made in China, and out of the 1% made elsewhere only 1% of those are made in France, and they have laminations Stamped in China :)

[John S]

The comment about the Chinese are not good at detent torque and the French are better, is laughable when you consider that 99% of stepper motors are made in China, and out of the 1% made elsewhere only 1% of those are made in France, and they have laminations Stamped in China :)

Note the spelling ;)
I know it was late when I posted but I thought the Brits might get the pun.

John S.

[Robin Hewitt]

I know it was late when I posted but I thought the Brits might get the pun.

Don't worry John, engineers know what a "detent" is but I needed my dictionary for "detente", the easing of strained relationships

I think Gary is feeling squeezed, hardly my intention. It looks like the Changzhou Fulling Motor Company have the cnc market fairly well stitched up when it comes to 2 phase NEMA 34 steppers. Unfortunately this new breed of CNC fanatics who buy stepper motors by holding torque rather than performance could eventually lead to the manufacture of some pretty weird motors if they ever become a significant part of the market rather than just a fringe. Let's hope it never happens :D

I can see Gary's problem, if he does the graphs showing the pull in torque falling away as speed increases when others don't, it's hardly going to help his sales. The market already seems hell bent on NEMA 23 size motors, possibly because you can fit it straight on the end of a ball screw on a table top mill without overhanging the bed.

However my colours are somewhat nailed to the mast, I have cut my fittings to take a NEMA 34 max length 90mm so it's either the FL86STH65 or the FL86STH80. The ebay item seems to have higher Ampage coils fitted than the UK offering, but do I actually need it? It certainly doesn't take a vast amount of torque to turn my handles, OTOH my max speed on a G00 is a tediously slow which is why the torque/speed graph is all important to me when deciding.

[John S]

Torque speed is pretty much useless as they often send the wrong graphs out anyway.
Some exporters are only clearing houses and will ship any documentation they can get there hands on, lets face it one 34 looks very much like another 34 .

John s.

[Robin Hewitt]

Torque speed is pretty much useless as they often send the wrong graphs out anyway.

Tell me about it

Web searching did turn up some graphs, one had N.cm when I'm fairly sure they meant Nm. On another R/S but nothing to say if it was revs or radians.

The search continues...